Seepage Analysis And Study On Anti-Seepage Measures Of Li River Third Tunnel From Shang Zhou To Lan Tian Highway

There is difference of waterhead between the proposed Li River reservoir and the Li River tunnel., which will likely lead to Li River tunnel seepage certainly, thus affecting the operational safety of the tunnel. To carry out Li River tunnel seepage analysis and anti-seepage measures play an important value on engineering.Thesis main work as follows:(1) Do a research of a specific hydro-geological investigation, such as field geological survey, concentrating on fracture survey and statistics and fault investigation between the tunnel and reservoir, geophysical prospecting of earth fault, geological exploration drilling of fault, as well as the pressurizing water test, etc., in order to provide practical parameters for seepage mode;(2) Carry out rockmass seepage observations and measurements during the tunnel excavation, and measure the total seepage discharge after the completion of the tunnel;(3) Make a theory analysis on fracture mechanics in rock mass hydraulics, and establish a mathematical model of rock seepage analysis combined with Li River tunnel rock mass characteristics and the actual hydro-geological conditions;(4) According to the tunnel seepage volume in the completion period, carry out the inversion analysis of a reasonable permeability coefficient with the use of rock flow software, and verify the necessity of grouting through the comparative analysis of waterhead distribution and seepage velocity distribution between grouting and without grouting;(5)According to seepage analysis results of Li River tunnel when Li River reservoir water level is 880m, when sudden rainstorm comes, and under the action of Li River reservoir water level is 880m with the sudden rainstorm.Put forward anti-seepage and drainage measures for Li River 3rd tunnel project:grouting in anti-pressure section to reduce seepage and prevent the surrounding rock seepage failure, seting waterproof board and earthwork cloth in all the tunnel, making reasonable arrangements for vertical drainage system,in order to achieve the combination of anti-seepage and drainage.In this paper,author verifys the necessity of grouting through a numerical simulation in anti-pressure section of Li River 3rd tunnel under three working conditions, and provides an important measures for anti-seepage and drainage design.