A Method for Predicting the Formation Time of Surface Subsidence of Tunnel Water and Mud Inrush

Abstract

The invention provides a method for predicting the formation time of tunnel water and mud inrush surface subsidence, comprising the following steps: 1) calculating the buried depth H of the water and mud inrush breach; 2) calculating the equivalent diameter D of the cross section of the tunnel fracture zone; 3) Calculate the natural weight γ, cohesion c and internal friction angle of the soil in the broken zone 4) Calculate the undrained shear strength c of the soil in the broken zone and surrounding rock u ; 5) Calculating the critical shear strength c of the broken zone per unit height due to soil loosening u，cri , 6) Calculate the critical ratio r when the broken zone slides, r=c u，cri / c u ;7) Calculate the time t required for the unit height broken zone to slide down, t=1.06r ‑16.85 ; 8) Calculate the total time T from the start of water and mud inrush to the formation of surface subsidence, T=tH. The invention provides a method for predicting the formation time of surface subsidence of water and mud inrush in tunnels, which has the advantages of simple use, strong flow and reliable results.

Description

Technical field [0001] The present invention relates to the field of infrastructure, specifically refers to a method for predicting the formation time of surface collapse after the occurrence of tunnel water inrush mud. Background [0002] With the development and needs of transportation infrastructure construction, people pay more and more attention to the development and utilization of underground space, tunnel construction is an important part of it, it has the advantages of overcoming the influence of terrain elevation, improving routes, shortening mileage, increasing speed, saving time, reducing land use, and diverting traffic, so as to achieve rapid development. However, tunnel engineering often crosses various types of geological conditions, and when encountering special structures such as caves, dark rivers, fault fracture zones or complex and undesirable geological bodies, it is in an unfavorable stress field, seepage field, temperature field environment, and it is very ...

AI Technical Summary

Problems solved by technology

Clarifying the time from water and mud inrush to surface subsidence is of great significance for preventing casualties caused by surface subsidence. Up to now, there has been no prediction method for the formation time of surface subsidence. In view of this, the present invention proposes a The method used to predict the formation time of surface subsidence after water and mud inrush occurs in tunnels has the advantages of simple use, strong process flow and reliable results