Prediction and risk assessment of karst tunnel water inflow under different precipitation conditions
Taking a karst tunnel in the slope area of the deep canyon area of the northeast Yunnan Plateau as an example,Using karst hydro-geological survey,water injection test,fault characteristics,distribution of coal seam and old kiln,Analy-zing the characteristics of karst development in the slope zone of the deep canyon area,Divide 6 karst hydrodynamic zones,The risk segment of water penetration as Grade A(K35+800～K37+970,K39+530～K40+740),This section is a high-risk section for tunnel construction and safe operation;Three methods predict the tunnel inflow under extreme drought,dry season,wet season and the maximum daily precipitation of each month,Different water inflow under different conditions(min-imum 6 578 m3/d,Max.58 093 m3/d);The water inflow of the tunnel crossing fault K39+830 is 10 723 m3/d.The meth-od of multi-method analysis of karst tunnel inflow can be used as a reference for fine investigation,dynamic design,safe con-struction,guarantee tunnel structure and safe operation,so as to achieve the treatment principle of one renovation without any future problems.
karst tunnelseasonal change beltwater inflowtrush water
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