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应用FLAC3D程序对可卡可多辛克雷尔水电工程两条高压引水隧洞三种工况的渗流场进行了数值仿真计算,研究了高压引水隧洞采用透水衬砌设计时,渗流场中水压的变化情况。结果表明:固结灌浆对降低隧洞的渗透压力有显著效果,一定要保证灌浆深度和质量;在施工完建期和检修期,隧洞的外水压力明显大于内水压力,充水运行期内外水压差别不大;检修期,放空速度对于引水隧洞的孔压变化情况有着十分显著的影响。
The FLAC3D program was used to simulate the seepage field of two high pressure diversion tunnels in the Kokacorn Hydropower Project. The variation of hydraulic pressure in the seepage field was studied when the seepage field of the high pressure diversion tunnel was designed with the water-permeable lining. The results show that the consolidation grouting has a significant effect on reducing the infiltration pressure of the tunnel, and the depth and quality of the grouting must be guaranteed. The external water pressure of the tunnel is obviously greater than the internal water pressure during the construction completion and maintenance period, Pressure difference is not big; Overhaul period, the emptying speed has a very significant influence on the pore pressure change of the diversion tunnel.