ABSTRACT
Based on the double-pipe tunnel construction project of the west line of the lake section of the Dongguan supporting pipeline project of the Pearl River Delta water resources allocation project, a three-dimensional fluid-solid coupling calculation model of the double-pipe tunnel under different lake water depths (4 m, 8 m, 12 m) was established using the finite element software ABAQUS. The surface settlement, surrounding rock pore water pressure and seepage velocity distribution of the double-pipe tunnel excavation process under the same lake water depth with different driving methods and under different lake water depths with the same driving method were compared and analyzed. The results show that, under the same lake water depth, the surface settlement of the double-pipe tunnel driven simultaneously is smaller than that of the double-pipe tunnel driven sequentially, the surrounding rock pore water pressure is larger, and the soil seepage velocity is basically consistent; under the same driving method, with the increase of the lake water depth, the surface settlement of the pipe tunnel gradually increases, and the surrounding rock pore water pressure and seepage velocity also increase.
