Study On The Seepage Field Of Zhong Liangshan Tunnel With The Nearby Of New Tunnel

Tunnel is often a blocking point of urban transportation,along with the development of the city,both successful chengyu expressway in zhong liangshan tunnel has become a big wall.Therefore,in order to alleviate traffic pressure,the existing tunnel on each new build a new tunnel,the new built tunnel to close to existing tunnel surrounding rock mass stress field and seepage field cause certain effect.In zhong liangshan in tunnel as the research background,theoretical calculation and numerical calculation is used to contrast analysis the zhong liangshan in the newly built tunnel to close to the impact of both the tunnel seepage field,and provides for both the tunnel seepage protection reinforcement proposals.In this paper,the main research contents and conclusions are as follows:(1)In order to simplify the calculation,using the method of generation such as circle radius,put in zhong liangshan is not circular tunnel into circular tunnel,and using the method of conformal mapping of complex function will not be circular boundary conditions into a circular boundary conditions.Simplified model used in zhong liangshan existing tunnel of tunnel water inflow to detailed derivation process of analytical solution,and combining the sato state formula deduced tunnel water inflow often formula.No time differences analysis summarizes the two tunnel water inflow formula in the presence of interference at the same time,combining the zhong liangshan tunnel is concluded that the revised both tunnel and the newly built tunnel water inflow calculation formula under the time difference of interference.(2)Using analytical solution formula,empirical formula and FLAC3 D numerical simulation tunnel water inflow of the two cases are calculated respectively:(1)build a new tunnel before the interference;(2)build a new tunnel after interference.Results show that both the tunnel water inflow than that of the existing tunnel,such as underground water level distance tunnel center distance of 60 m,numerical calculation of interfere with the location of 1.741m3/d·m,not interfere with the water inflow is2.127m3/d·m.(3)Comparing the numerical solution and analytical solution,using the MATLAB software to fit often formula of water inflow,often water inflow analytical solution of the revised formula are obtained.And the interference correction formula of water inflow,determine the correction factor value,it is concluded that the interferenceof the revised formula of water inflow.(4)The FLAC3 D is adopted to zhong liangshan in the tunnel without coupling and coupling analysis of seepage field and pore water pressure was simulated,and calculate the groundwater water flowing into the tunnel,draw a fluid-structure interaction cases into the tunnel water inflow is greater than the water without coupling.Such as underground water level for 60 m distance from the center of the tunnel,the coupling of existing tunnel interfere with the location of a value of 1.741m3/d·m,interference is not coupled water inflow is 0.752m3/d·m,because under the influence of seepage,change the stress field of surrounding rock,the porosity and permeability in the rock mass increase.(5)The FLAC3 D is adopted to both in zhong liangshan tunnel not only at the top of the surrounding rock grouting reinforcement,reinforcement(reinforce the half circle)and curtain grouting reinforcement(reinforcing a circle)after the analysis of the numerical simulation.It is concluded that water flow into the tunnel after reinforcement value is smaller than water before strengthening values,Such as strengthening a circle water seepage calculation after the balance is 0.0126m3/d·m,before strengthening water seepage calculation after the balance is 2.127m~3/d·m.