Translated Title

Analytical solution of seepage field and prediction of water inflow in tunnels considering damage effects

Translated Abstract

The　water　inflow　along　the　circumferential　surface　of　a　tunnel　is　an　important　parameter　in　tunnel　engineering.Previ-ous　research　did　not　consider　the　impact　of　excavation-induced　damage　on　the　seepage　field,while　tunnel　construction　can　cause　a　certain　degree　of　damage　to　surrounding　rock.Therefore,this　study　took　into　account　the　influence　of　tunnel　excavation-induced　damage,and　derived　theoretical　analytical　solutions　for　two-dimensional　seepage　fields　in　tunnels　under　three　different　radial　grouting　conditions:no　radial　grouting,partial　radial　grouting,and　full　radial　grouting.Subsequently,we　explored　the　applicability　of　two　commonly　used　equivalent　circle　methods　in　rectangular　tunnels　for　analyzing　theoretical　solutions　to　tunnel　seepage　fields.Sensitivity　analysis　was　conducted　on　the　radial　grouting　parameters　responding　to　tunnel　circumferential　water　inflow　and　external　lining　water　pressure.Finally,a　comparison　was　made　between　the　theoretical　analytical　solutions　and　numerical　solutions　for　tun-nel　seepage　fields.The　results　indicated　that　the　two-dimensional　seepage　calculation　model　for　tunnels　can　effectively　reflect　the　water　inflow　along　the　circumferential　surface　of　the　tunnel.Excavation-induced　damage　had　a　significant　impact　on　the　tunnel＇s　circumferential　water　inflow,with　the　greatest　effect　before　initial　support　construction　and　the　least　effect　after　secondary　lining　construction.When　the　relative　permeability　coefficient　km/kg　for　radial　grouting　reached　100　and　the　relative　thickness　dg　for　ra-dial　grouting　reaches　1.0　times　the　tunnel＇s　inner　diameter　r0,further　increasing　km/kgor　dg/r0　will　not　significantly　reduce　the　circumferential　seepage　flow　rate　Q　and　the　outer　water　pressure　p,but　will　only　increase　construction　costs　unnecessarily.The　findings　of　this　study　can　offer　certain　theoretical　guidance　for　radial　grouting　design　of　tunnels　situated　in　adverse　geological　stra-ta.

Translated Keyword

analytical solution
equiv-alent area method
equivalent perimeter method
two-dimensional seepage field of tunnels
water inflow

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Project No.

Access Number

WF:perioarticalrmcj202410026

Language

Chinese

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