The Prediction Of Water Inflow In Broken-rock Zones Of Tunnel In Mountain Areas

With the large-scale infrastructure construction,our country has a rapid development of the domestic economy.Most of the mountains in southwestern China are high in elevation,abundant in underground water and complicated in geological processes.The mountain tunnel crossing the rich water areas when facing Surrounding rock fragmentation,it iseasy to cause water inrush disasters,consequences safety accidents and damage the groundwater environment.When the water inrush is inevitable,there has a great significance for the safety of the construction to determine the size of the tunnel water inflow and the location of water gushing.the domestic and foreign scholars put forward so many different calculation models and methods.this paper summarize the calculation method and hydro-geological model.According to the characteristics of mountain area,find suitable method for predicting the water inflow in the surrounding rock broken zone.The main results are as follows:1.Using the FLAC3 D numerical simulation software to establish the fluid-structure interaction,considering the mountain area tunnel excavation method to find out separated tunnel common prone water gushing position.2.Combined with the blast working,which method is widely used in mountains areas,by the use of FLAC3 D to establish dynamic analysis model,simulation the construction blasting effect to the rock weak-structure-face,which will change the permeability of surrounding rock.put forward when H-R≤Z≤H+R,K_z=k₀exp（-AZ）+a₁S_w,which is more suitable to forecast surrounding rock with water inflow.3.Use K_z=k₀exp（-AZ）+a₁S_w to calculate a real engineering water inflow,compared with the FLAC3 D numerical simulation,to find more suitable method for predicting the water inflow in the surrounding rock broken zone.