Observation And Analysis Of Rock Mass Seepage In Li Jiahe Tunnel Of Shang Luo To Lan Tian Highway

Tunnel flooding is the common main geological disaster in the tunnel construction and operation. In deeply buried tunnel, geology condition is complex. Many geological units are opened out. Tunnel excavating, causes stress heavy distribution of rock mass in tunnel. Meanwhile destroyed the ground-water drainage channel.Therefore, It is very significant for observation and analysis of the rock mass infiltration flow fields in tunnel and adopting bailing technique in designation and construction of stress fields coupling.In this article, the research object is Li Jiahe tunnel on Xi'an-Hefei highway, The main research work:(1)Analysis the status of fractured rock flow ,nail down the main object of Li jiahe tunnel Seepage analysis is estimating tunnel seepage discharge after water level of reservoir reach 880m, provide the basis for the drainage design;(2) Basis on the regional geological survey In the tunnel, investigate and statistic the cranny and faultage between tunnel and reservoir, investigate hydrogeological background of Li jiahe tunnel, focusing on seepage discharge observation and record during the excavation of the tunnel.(3) Bored with the scene of the pressurised water, drilling water test, firstly determined the rock permeability coefficient; (4) Established a seepage numerical model of Li jiahe tunnel, based on the seepage discharge observations at the scene during the excavation of the tunnel, based GEO-SLOPE software simulation analysis get hold of district parameters of seepage;(5) According to achieve the flow parameters distribution, simulation the leakage of the tunnel after Water Level of Reservoir reach 880m, provide the basis for the drainage design. In the process of seepage analysis, compared consider coupling with not consider coupling. Reached the following conclusions:(1) Through field observation and measurement has obtained under the tunnel excavation condition leakage condition and the tunnel total leakage quantity.(2) Tunnel wells up in the water forecast, considered infiltrates the flow field and the stress field coupling function in a big way obtains the leakage quantity compares does not consider when the coupling above 30%.(3) Through adjusts the penetration coefficient repeatedly, under the simulation natural transfusion condition the tunnel seepage quantity causes it with the actual seepage quantity match case, thus obtains the accurate penetration coefficient.(4) According to the partition seepage parameter distribution in back analysis, obtained the tunnel's leakage quantity after Li Jiahe reservoir storage by simulation.(5) Basis analog computation tunnel seep quantity, proposed the tunnel guards against infiltrates the design basis the suggestion. Analyzes the scene the transfusion condition, puts forward the revision design proposal: By the row primarily, the seepage quantity big spot increases the grouting measure, reduces the leakage quantity, reduces the draining water facility the pressure.