Study On Engineering Technique Of Blocking And Limiting Discharge In Transmountain Metro Tunnel

With the development of our city traffic construction， the mountain subwaytunnels emerge continuously，which pass through the montanic residents living areaand ecological resources protection zone regularly.If water blockade and drainagelimitation measure of tunnel is used irrelevantly,it must break the original balance ofunderground water and cause loss of water resources.And then, it damage theindustrial and agricultural production,life of residents, ecological resources upper thetunnel. Therefore, we must pay attention to using the water blockade and drainagelimitation measure in mountain subway tunnels construction accurately.In the past, tunnel construction took the drainage mainly.It solved the harm oftunnel gushing to some extent, but it broke the water resource and entironment. Thispaper based on the subway tunnel of Zhong Liang-shan，which is part of ChongqingMetro LineⅠ，It took “blocking and intercepting water first，combined with limitingthe quantity of the discharging water” as a guide.After clearing the research direction,firstly, this paper introduced the development of tunnel water handling at home andabroad, and focus on the application and development of grouting and blocking watercurrently. Secondly, it discoursedupon the various forecast models of flowing yieldcontrastively. Then it introduced the genres, features of fractured rock and the testmethod of rock permeate coefficient, and the relation between rock permeatecoefficient of fractured rock and stress, pressure, depth.And it discoursed upon thebuilding of stress-seepage coupling mathematical model by equivalent continuummodeland mathematic theory.And then, it combined the actual engineering situation ofZhong Liang-shan tunnel,it discussed the grouting scheme of blocking ground waterand limiting discharge. And then, it proved that the GTS software model can imitateZhong Liang-shan tunnel accurately in considered the stress-seepage coupling.Finally,the grouting scheme of Zhong Liang-shan tunnel optimized by the analysis results ofGTS model,and it achieved a good economic and security effect.This paper used GTS software model in Zhong Liang-shan tunnel construction，took water inflow of GTS software model and grouting scheme of blocking groundwater and limiting discharge together by the permeate coefficient of tunnel groutingcircle boldly.And it was a successful attempt for the grouting technology of blocking ground water and limiting discharge.It guide the blocking ground water and limitingdischarge construction of Zhong Liang-shan tunnel, and provide the guidance for theblocking ground water and limiting discharge construction of the urban mountainoussubway tunnel.