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学者姓名：刘红位
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Abstract ：
The balance weight retaining wall is a kind of gravity retaining wall. However, the theoretical results of the earth pressure are relatively few. The failure modes of backfill soil under different factors such as width to depth ratio of fill soil and rock inclination angle were studied by finite element limit analysis. Based on differential element methods and wedge limit equilibrium method, the active earth pressure calculation formula of balance weight retaining wall under translational displacement mode was derived. According to the parameter analysis, the interface friction resistance escalates alongside the rise in the boundary friction angle. The active earth pressure resultant force of the retaining wall increases with the increase of the width to depth ratio of filling, and decreases with the increase of the friction angle of filling. The design of counterweight retaining wall can benefit from the scientific basis and technical reference offered by the research findings.
Keyword ：
Active earth pressure Active earth pressure Balance weight retaining wall Balance weight retaining wall Differential element method Differential element method Narrow backfill Narrow backfill Translational displacement Translational displacement
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| GB/T 7714 | Xiong, Chuanxiang , Xu, Yuanyuan , Xing, Zhiquan et al. Study on active earth pressure of narrow backfill of balance weight retaining wall under translational displacement mode [J]. | DEVELOPMENTS IN THE BUILT ENVIRONMENT , 2024 , 18 . |
| MLA | Xiong, Chuanxiang et al. "Study on active earth pressure of narrow backfill of balance weight retaining wall under translational displacement mode" . | DEVELOPMENTS IN THE BUILT ENVIRONMENT 18 (2024) . |
| APA | Xiong, Chuanxiang , Xu, Yuanyuan , Xing, Zhiquan , Tang, Wenjie , Shao, Yongbo , Zhang, Xin et al. Study on active earth pressure of narrow backfill of balance weight retaining wall under translational displacement mode . | DEVELOPMENTS IN THE BUILT ENVIRONMENT , 2024 , 18 . |
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The gas diffusion (Dg) and permeability (Kg) coefficients are the two important parameters for the study on gas transport in unsaturated soils. In the present study, the theory of calculating Dg and Kg for unsaturated soils under steady state is derived. Dg and Kg of unsaturated soils are determined based on the relationship between tracer gas concentration (C) and gas flow rate (q1) and that between pressure gradient (p) and gas flow rate (q2), respectively. A device for in-situ measurement of Dg and Kg in unsaturated soils is designed and developed. The soil column tests are conducted to measure Dg and Kg of unsaturated soils with different water contents. Thereafter, the element tests and numerical simulation analysis are used to verify the effectiveness of the new method and device. It is found that Dg and Kg obtained by the new method are in good agreement with the results of the element tests and numerical simulations. The results of the sensitivity analysis show that the measurement accuracy of Dg reduces as the soil water content decreases, while the measurement accuracy of Kg is independent of water content of soil. The measurement accuracies of both Dg and Kg decrease with the increase of the radius of the aeration bulb, but the measurement of Kg is more sensitive to the change of the radius. The measurement accuracy of Kg is about 55% of the true value, when the radius of the aeration bulb is 0.05 m. The soil anisotropy reduces the measurement accuracy; when the values of Dgv/Dgh and Kgv/Kgh is 0.1, the measurement accuracies of Dg and Kg can still reach more than 40%. © 2024 Chinese Society of Civil Engineering. All rights reserved.
Keyword ：
Diffusion in gases Diffusion in gases Flow of gases Flow of gases Gases Gases Gas permeability Gas permeability Numerical methods Numerical methods Numerical models Numerical models Sensitivity analysis Sensitivity analysis Soil moisture Soil moisture Soil testing Soil testing
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| GB/T 7714 | Liu, Hongwei , Wang, Mengqi , Zhan, Liangtong et al. Method and apparatus for measuring in-situ gas diffusion coefficient and permeability coefficient of unsaturated soils [J]. | Chinese Journal of Geotechnical Engineering , 2024 , 46 (5) : 948-958 . |
| MLA | Liu, Hongwei et al. "Method and apparatus for measuring in-situ gas diffusion coefficient and permeability coefficient of unsaturated soils" . | Chinese Journal of Geotechnical Engineering 46 . 5 (2024) : 948-958 . |
| APA | Liu, Hongwei , Wang, Mengqi , Zhan, Liangtong , Feng, Song , Wu, Tao . Method and apparatus for measuring in-situ gas diffusion coefficient and permeability coefficient of unsaturated soils . | Chinese Journal of Geotechnical Engineering , 2024 , 46 (5) , 948-958 . |
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Soil column tests were conducted to investigate methane oxidation efficiency in three configurations of earthen landfill cover under two drying stages separated by an applied rainfall, including the monolithic evapotranspiration (ET) cover, the cover with capillary barrier effect (CCBE) and the three-layer cover. Comprehensive measurements were also documented for water–gas response in soil for analyzing the experimental outcomes. The maximum methane oxidation efficiency of three-layer cover, monolithic ET cover, and CCBE were about 71 %, 62 % and 58 %, respectively. This was because the three-layer cover had the largest oxygen (O2) concentration in soil above depth of 400 mm, where methane oxidation mainly occurred. This was due to the good airtightness of the bottom hydraulic barrier layer, which led to the lowest air pressure above depth of 400 mm, thereby promoting the entry of atmospheric O2 into the soil. The monolithic ET cover generally had a larger methane oxidation efficiency than CCBE during the first drying stage by up to 12 %, while the trend reversed overall during the second drying stage, likely due to the enhanced air-tightness of CCBE caused by higher soil water content after rainfall induced by the capillary barrier effects. The methane oxidation efficiency for each landfill cover became lower by up to 30 % during the second drying stage than that during the first drying stage, owing to the higher water content during the second drying stage after rainfall, leading to a larger gas pressure and hence a lower O2 concentration at shallow soil. © 2024 Elsevier Ltd
Keyword ：
Atmospheric pressure Atmospheric pressure Capillarity Capillarity Land fill Land fill Soil testing Soil testing Water content Water content
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| GB/T 7714 | Liu, H.W. , Huang, Y. , Feng, S. et al. Experimental study of methane oxidation efficiency in three configurations of earthen landfill cover through soil column test [J]. | Waste Management , 2024 , 190 : 370-381 . |
| MLA | Liu, H.W. et al. "Experimental study of methane oxidation efficiency in three configurations of earthen landfill cover through soil column test" . | Waste Management 190 (2024) : 370-381 . |
| APA | Liu, H.W. , Huang, Y. , Feng, S. , You, S.Q. , Hong, Y. , Shen, L.D. . Experimental study of methane oxidation efficiency in three configurations of earthen landfill cover through soil column test . | Waste Management , 2024 , 190 , 370-381 . |
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Wetting-drying cycles have a significant impact on the gas diffusion coefficient (Dp) and gas permeability (ka) of unsaturated soils. The soil volume change during wetting-drying cycles limits the application of the traditional rigid-wall device for measuring ka and Dp, due to the gas preferential flow along the interface between soil and the rigid-wall container. Although flexible-wall devices for measuring ka are available, no such device exists for measuring Dp. Thus, the effects of wetting-drying cycles on Dp remain unclear, particularly for fine-grained soil. The present study developed a flexible-wall device to investigate the effects of a wetting-drying cycle on the Dp and ka of unsaturated soils. Both the flexible- and rigid-wall devices were adopted to measure ka and Dp of three soil types, including fine sand, silt and kaolin. The rigid-wall device could overestimate ka by up to approximately one order of magnitude, whereas it overestimated Dp by approximately 2-3 times. Regardless of ka and Dp, the difference in measurements between the rigid- and flexible-wall devices became more significant at a lower water content and along the drying path because of the gas preferential flow caused by soil shrinkage in the rigid-wall device. Accordingly, the kaolin exhibited the largest difference in ka and Dp as measured by the flexible- and rigid-wall devices because it had the largest clay minerals and the finest particle size, resulting in the largest volume shrinkage. The ka and Dp measured by the flexible-wall device along the drying path were generally larger than those along the wetting path, probably because of entrapped gas in the soil caused by water spray during wetting. © 2024 American Society of Civil Engineers.
Keyword ：
Gas transport Gas transport Measurement device Measurement device Soil texture Soil texture Soil volume change Soil volume change Wetting-drying cycles Wetting-drying cycles
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| GB/T 7714 | Liu, Y. , Feng, S. , Liu, H. . Measurements of Drying and Wetting Gas Diffusion Coefficients and Gas Permeability of Unsaturated Soils Using a New Flexible-Wall Device [J]. | Journal of Geotechnical and Geoenvironmental Engineering , 2024 , 150 (11) . |
| MLA | Liu, Y. et al. "Measurements of Drying and Wetting Gas Diffusion Coefficients and Gas Permeability of Unsaturated Soils Using a New Flexible-Wall Device" . | Journal of Geotechnical and Geoenvironmental Engineering 150 . 11 (2024) . |
| APA | Liu, Y. , Feng, S. , Liu, H. . Measurements of Drying and Wetting Gas Diffusion Coefficients and Gas Permeability of Unsaturated Soils Using a New Flexible-Wall Device . | Journal of Geotechnical and Geoenvironmental Engineering , 2024 , 150 (11) . |
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气体扩散系数D_g和渗透系数K_g是研究非饱和土中气体运移的两个重要参数。推导了稳态条件下,非饱和土中气体运移参数的计算理论。该理论基于示踪气体浓度C与气体流量q_1之间及压力梯度P与气体流量q_2之间的变化规律,分别确定非饱和土的D_g,K_g。依据推导的理论公式,设计并研制了一种原位测量非饱和土的D_g,K_g的装置。开展土柱试验,利用新装置测量非饱和土的D_g,K_g,并采用单元试验和数值模拟验证新方法和装置的有效性。研究表明新方法测量的非饱和土的D_g,K_g与单元试验及数值模拟结果吻合良好。基于数值模拟开展的敏感性分析结果揭示:D_g测量准确度随土体的质量含水率w减少而降低,而K_g的测量准确度受含水量的影响不显著;非饱和土的D_g,K_g的测量准确度均随着注气球半径增加而降低,但是注气球半径对K_g的测量准确度的影响更为显著,当注气球半径增加到0.05 m时,其准确度约为55%;土体各向异性降低测量准确度,当竖向与水平向的气体运移参数的比值D_(gv)/D_(gh)和K_(gv)/K_(gh)均为0.1时,D_g,K_g的测量准确度仍可达到40%以上。
Keyword ：
原位测量装置 原位测量装置 数值模拟 数值模拟 气体扩散系数 气体扩散系数 气体渗透系数 气体渗透系数 非饱和土 非饱和土
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| GB/T 7714 | 刘红位 , 王孟奇 , 詹良通 et al. 一种原位测量非饱和土的气体扩散系数和渗透系数的方法与装置 [J]. | 岩土工程学报 , 2024 , 46 (05) : 948-958 . |
| MLA | 刘红位 et al. "一种原位测量非饱和土的气体扩散系数和渗透系数的方法与装置" . | 岩土工程学报 46 . 05 (2024) : 948-958 . |
| APA | 刘红位 , 王孟奇 , 詹良通 , 冯嵩 , 吴涛 . 一种原位测量非饱和土的气体扩散系数和渗透系数的方法与装置 . | 岩土工程学报 , 2024 , 46 (05) , 948-958 . |
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为了将产生的淤泥重复利用，开展改良淤泥废土试验。以纤维和磷石膏为固化剂固化处理淤泥，进行不同养护龄期下不同掺量的纤维、磷石膏-淤泥混合土的无侧限抗压试验和渗透试验，探究不同纤维和磷石膏掺量下的力学性质以及饱和渗透系数变化规律。研究结果表明：聚丙烯纤维对强度的增强效果显著，且随着聚丙烯纤维掺量的增加，纤维固化淤泥土的强度逐渐提高。固化淤泥土的无侧限抗压强度随着磷石膏掺量增加呈现先增大后减小的趋势，磷石膏的最优掺量为1.84%(干重量之比)。磷石膏-固化淤泥土混合样的无侧限抗压强度随养护时间的增加而增大，14 d之后趋于稳定。固化淤泥土的饱和渗透系数随着纤维和磷石膏掺量增加而提高。磷石膏-固化淤泥土饱和渗透系数随着养护龄期增加而提高，养护14 d后其值趋于稳定。淤泥的饱和渗透系数均随着纤维和磷石膏掺量的增加而增加。
Keyword ：
无侧限抗压强度 无侧限抗压强度 淤泥 淤泥 磷石膏 磷石膏 纤维 纤维 饱和渗透系数 饱和渗透系数
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| GB/T 7714 | 郑清松 , 曾佑荣 , 刘阳光 et al. 纤维和磷石膏对淤泥强度及饱和渗透系数的影响规律 [J]. | 水利与建筑工程学报 , 2024 , 22 (02) : 1-6,31 . |
| MLA | 郑清松 et al. "纤维和磷石膏对淤泥强度及饱和渗透系数的影响规律" . | 水利与建筑工程学报 22 . 02 (2024) : 1-6,31 . |
| APA | 郑清松 , 曾佑荣 , 刘阳光 , 刘红位 . 纤维和磷石膏对淤泥强度及饱和渗透系数的影响规律 . | 水利与建筑工程学报 , 2024 , 22 (02) , 1-6,31 . |
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Vegetation has been found to improve the hydrological performance of landfill cover. However, existing studies ignore effects of hydrogen sulphide (H2S), which is a toxic odour generated from municipal solid wastes. H2S is a potential signalling molecule in regulating plant-stomata aperture, but how the plant-H2S interaction affects the water-gas transport in soil remains unknown. This study aimed to investigate effects of H2S on Bermuda grass growth and its influence on water-gas transport in unsaturated soils. Soil columns, with and without vegetation, were prepared and fumigated with different H2S concentrations. These columns were subjected to controlled drought and rainfall sequentially. The results showed that grass leaves almost wilted without H2S fumigation due to the Pythium diseases caused by antecedent waterlogged conditions. In contrast, H2S fumigation promoted grass growth because of the fungicidal effects of H2S. Upon drought, H2S fumigation caused stomata closure, which resulted in a lower matric suction in the vegetated soil than that without H2S fumigation. Accordingly, H2S concentration reduced because of oxidation by metal oxides in soil. Upon subsequent rainfall, more infiltration but lower matric suction was observed in vegetated soils than that in bare case, whereas H2S concentration decreased continuously due to gas dissolution in the pore water. Direct application of laboratory findings herein to field cases should be used with cautions, because the applied continuous lightening and low evapotranspiration rate of the soil column tests may not be representative to field conditions.
Keyword ：
gas gas landfills landfills unsaturated soil unsaturated soil vegetation vegetation water flow water flow
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| GB/T 7714 | Feng, Song , Leung, Anthony Kwan , Zhan, Liang Tong et al. Effects of hydrogen sulphide on grass traits and water-gas transport in grass-planted unsaturated soil [J]. | GEOTECHNIQUE , 2023 , 74 (12) : 1404-1420 . |
| MLA | Feng, Song et al. "Effects of hydrogen sulphide on grass traits and water-gas transport in grass-planted unsaturated soil" . | GEOTECHNIQUE 74 . 12 (2023) : 1404-1420 . |
| APA | Feng, Song , Leung, Anthony Kwan , Zhan, Liang Tong , Liu, Hong Wei , Wang, Min , Guo, Xing Kai . Effects of hydrogen sulphide on grass traits and water-gas transport in grass-planted unsaturated soil . | GEOTECHNIQUE , 2023 , 74 (12) , 1404-1420 . |
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Landslides induced by typhoon and associated rainstorm in high vegetation coverage area have remarkable characteristics of mass, sudden and high hiddenness. Given the increasing demand for disaster prevention and mitigation, how to scientifically reveal their failure mechanisms and construct intelligent early warning models is becoming a hot and cutting-edge problem in current research. Firstly, the paper takes the frequent occurrence of landslides induced by typhoon and associated rainstorm in Zhejiang and Fujian provinces as an example, and systematically summarizes their geomorphological, spatial and temporal distribution and overlying vegetation and other developmental characteristics. Secondly, the current status and shortcomings of the research on the mechanism of landslides induced by typhoon and associated rainstorm, and the influence of vegetation on slope stability and its early warning were highlighted and analyzed. On this basis, it is emphasized that there are still three problems that need to be solved in the current research on landslides induced by typhoon and associated rainstorm in high vegetation coverage area: 1) the hydrological dynamic response of vegetated slopes under the combined effect of typhoon and rainstorm is not sufficiently described; 2) the mechanism of disaster is still unclear and the methodology of landslide stability evaluation is lack of relevance; 3) there are few dynamic early warning models that take into account the coupling of multiple parameters, and the existing early warning models are insufficient to provide refined and accurate warnings for landslides induced by typhoon and associated rainstorm in high vegetation coverage area. Finally, it is suggested that future research should focus on the interaction between geology, vegetation and meteorology, and identify the environment and developmental patterns of landslides induced by typhoon and associated rainstorm in high vegetation coverage area, reveal the failure process and disaster mechanism, and establish a spatial and temporal early warning model for the whole process of typhoon and associated rainstorm. The paper aims to explore a new perspective and research idea for the study of landslide induced by typhoon and associated rainstorm, and to provide a scientific decision-making and technical support for the early warning and prevention and control of landslides induced by typhoon and associated rainstorm in high vegetation coverage area worldwide. © 2023 Science Press. All rights reserved.
Keyword ：
disaster mechanism disaster mechanism early warning early warning high vegetation coverage high vegetation coverage landslide landslide typhoon and rainstorm typhoon and rainstorm
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| GB/T 7714 | Dou, H. , Jian, W. , Wang, H. et al. Review of failure mechanism and early warning model of landslides induced by typhoon and associated rainstorm in high vegetation coverage area; [高植被覆盖区台风暴雨型滑坡成灾机制及 预警模型研究综述] [J]. | Journal of Natural Disasters , 2023 , 32 (2) : 1-15 . |
| MLA | Dou, H. et al. "Review of failure mechanism and early warning model of landslides induced by typhoon and associated rainstorm in high vegetation coverage area; [高植被覆盖区台风暴雨型滑坡成灾机制及 预警模型研究综述]" . | Journal of Natural Disasters 32 . 2 (2023) : 1-15 . |
| APA | Dou, H. , Jian, W. , Wang, H. , Fan, X. , Liu, H. , Wu, Z. . Review of failure mechanism and early warning model of landslides induced by typhoon and associated rainstorm in high vegetation coverage area; [高植被覆盖区台风暴雨型滑坡成灾机制及 预警模型研究综述] . | Journal of Natural Disasters , 2023 , 32 (2) , 1-15 . |
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A new method and instrument were developed for in situ measurement of the gas diffusion coefficient (D-g) and gas coefficient of permeability (k(g)) of unsaturated soil. Air containing tracer gas of volumetric concentration of 5%-10% was continuously pumped into a point source at a constant flux rate (q(0)) until approaching steady state. Then, the pseudo-steady-state tracer gas concentration (C-r0) and gas gauge pressure (Delta Pr0) were recorded at a distance (r0) away from the point source. The Dg and kg were determined through the Cr0-q0 and Delta Pr0-q0 relationships, respectively. Soil column tests (silty sand) and field tests (sandy lean clay) were conducted to validate the new method. The in situ measured Dg and kg were comparable with those of undisturbed specimens measured by a two-chamber apparatus. The in situ measurement of Dg and kg ranged from 2x10-8 m2 s-1 to 4x10-6 m2 s-1 and 1.9x10-8 ms-1 to 3.9x10-7 ms-1, respectively. The measurement accuracy increased at deeper depth, due to reduced boundary effect at soil surface. The measurement of in situ Dg was more susceptible to the boundary effects than that of kg at shallower depth (i.e., 20 cm deep) in general. The field test results showed that the ratio of in situ Dg (or kg) to that measured by the element tests was generally between 1.2 and 3.3 at or below depth of 0.30 m, due to the in situ heterogeneity of soil.
Keyword ：
Gas coefficient of permeability Gas coefficient of permeability Gas diffusion coefficient Gas diffusion coefficient In situ measurement In situ measurement Unsaturated soil Unsaturated soil
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| GB/T 7714 | Feng, S. , Sun, J. X. , Zhan, L. T. et al. A New Method and Instrument for Measuring In Situ Gas Diffusion Coefficient and Gas Coefficient of Permeability of Unsaturated Soil [J]. | JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING , 2023 , 149 (7) . |
| MLA | Feng, S. et al. "A New Method and Instrument for Measuring In Situ Gas Diffusion Coefficient and Gas Coefficient of Permeability of Unsaturated Soil" . | JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING 149 . 7 (2023) . |
| APA | Feng, S. , Sun, J. X. , Zhan, L. T. , Liu, H. W. . A New Method and Instrument for Measuring In Situ Gas Diffusion Coefficient and Gas Coefficient of Permeability of Unsaturated Soil . | JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING , 2023 , 149 (7) . |
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高植被覆盖区台风暴雨型滑坡具有显著的群发、突发和高隐蔽特性,面对日益增加的防灾减灾需求,如何科学地揭示其成灾机制并构建智能预警模型正成为当前研究的热点和前沿问题.文中首先以浙闽两省频发的台风暴雨型滑坡为例,系统总结了其地貌地质、时空分布和上覆植被等发育特征.其次,从台风暴雨型滑坡成灾机制、植被对斜坡稳定性影响及台风暴雨型滑坡的预警预报等3个方面重点梳理并剖析了当前研究现状,强调指出当前有关高植被覆盖区台风暴雨型滑坡的研究仍存在台风-暴雨共同作用下植被发育斜坡的水文动态响应刻画不足、成灾机制仍不清晰以及由此导致滑坡稳定性评价方法缺乏针对性、已有预警模型精细化、精准化预警不足等亟待解决的深层次问题.最后,建议未来研究亟需聚焦地质-植被-气象的相互作用,查明高植被覆盖区台风暴雨型滑坡的孕灾环境与其发育规律,明确台风暴雨下植被发育斜坡的水文响应规律,揭示其失稳演化过程与成灾机制,建立台风暴雨过境全过程的时空预警模型.文中旨在为台风暴雨型滑坡的研究开辟新的视角和研究思路,进而为全球高植被覆盖区台风暴雨型滑坡的预警与防控提供科学决策和技术支撑.
Keyword ：
台风暴雨 台风暴雨 成灾机制 成灾机制 滑坡 滑坡 预警 预警 高植被覆盖区 高植被覆盖区
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| GB/T 7714 | 豆红强 , 简文彬 , 王浩 et al. 高植被覆盖区台风暴雨型滑坡成灾机制及预警模型研究综述 [J]. | 自然灾害学报 , 2023 , 32 (2) : 1-15 . |
| MLA | 豆红强 et al. "高植被覆盖区台风暴雨型滑坡成灾机制及预警模型研究综述" . | 自然灾害学报 32 . 2 (2023) : 1-15 . |
| APA | 豆红强 , 简文彬 , 王浩 , 樊秀峰 , 刘红位 , 吴振祥 . 高植被覆盖区台风暴雨型滑坡成灾机制及预警模型研究综述 . | 自然灾害学报 , 2023 , 32 (2) , 1-15 . |
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