Method for predicting the formation time of surface collapse of water inrush and mud inrush of a tunnel

Abstract

The invention provides a method for predicting the formation time of surface collapse of water inrush and mud inrush of a tunnel. The method includes the following steps: 1) calculating the buried depth H of the water inrush mud; 2) calculating the equivalent diameter D of the cross section of the tunnel fracture zone; 3) calculating the natural gravity of the soil within the fracture zone in thefracture zone , cohesion force c and internal friction angle, 4) Calculating the undrained shear strength cu of the soil within the fracture zone and the surrounding surrounding rock; 5) Calculating the breaking band at the unit height, the critical shear strength due to the looseness of the soil cu, cri, 6) Calculating The critical ratio r when falling of the fracture zone, wherein r=cu, cri / cu;7) Calculating the time required for the unit height to break down the belt t, wherein t=1.06r-16.85; 8) Calculating from the beginning of the water inrush Surface subsidence Time T, wherein T = tH. The invention provides a method for predicting the formation time of a tunnel water inrush mud surface, which has the advantages of simple use, strong process and reliable results.

Description

technical field [0001] The invention relates to the field of infrastructure construction, in particular to a method for predicting the formation time of surface subsidence after water and mud inrush occurs in tunnels. Background technique [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 ability to overcome the influence of terrain elevation, improve routes, shorten mileage, improve Speed, save time, reduce land use, ease traffic and other advantages, and thus get rapid development. However, tunnel engineering often passes through various types of geological conditions. When encountering special structures such as karst caves, underground rivers, fault fracture zones, or complex and unfavorable geological bodies, they are in an environment of unfavorable stress fields, seepage fields, and t...

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