Translated Title

Deformation-relaxation typical characteristics and laws of surrounding rock of underground water-sealed storage cavern during construction stage

Translated Abstract

Based　on　the　engineering　characteristics　of　underground　water-sealed　storage　caverns　and　typical　cases　of　storage　caverns,a　large　number　of　monitoring　data　including　internal　deformation,surface　deformation,P-wave　velocity　and　bolt　stress　of　surrounding　rock　of　storage　caverns　were　analyzed.The　results　show　that:the　displacement　of　the　multi-point　displacement　meter　embedded　before　excavation　is　mainly　0.5　to　3.0　mm,the　convergence　displacement　is　mainly　4　to　8　mm,and　the　settlement　deformation　of　cavern　vault　is　mainly　3　to　6　mm.The　time-dependent　deformation　of　surrounding　rock　is　not　obvious;the　deformation　of　surrounding　rock　is　mainly　related　to　the　blasting　excavation.When　the　working　face　or　the　excavation　face　of　the　subsequent　bench　is　closing　to　the　monitoring　section,the　deformation　increases　sharply.The　worse　the　quality　of　the　surrounding　rock　is,the　less　obvious　the　spatial　effect　of　the　excavation　surfaces.A　method　to　determine　the　loss　displacement　of　surrounding　rock　is　proposed.It　is　found　that　the　loss　displacement　accounts　for　50％to　60％of　the　final　convergence　displacement.Based　on　the　change　rate　of　P-wave　velocity,the　evalu-ation　index　of　surrounding　rock　relaxation　degree　is　proposed.It　is　found　that　the　maximum　relaxation　degree　of　surrounding　rock　is　about　0.47,and　the　relaxation　depth　is　1.5　m.The　stress　of　surrounding　rock　bolt　in　cavern　is　generally　small,and　the　tensile　stress　of　bolt　changes　synchronously　basically　with　the　deformation　of　surrounding　rock.

Translated Keyword

loss displacement
monitoring of construction stage
surrounding rock deforma-tion
surrounding rock relaxation
water-sealed storage cavern

Classification

Type

Project Name

Project No.

Access Number

WF:perioarticalfzdxxb202402017

Language

Chinese

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