Abstract: To investigate the effects of measures such as grouting and lining drainage on high external water pressure acting on lining in deep-buried tunnels, the Songlin Tunnel of Yunnan Central Water Diversion Project was selected as the study object. Numerical simulation calculation was conducted to investigate the variation of the surrounding rock seepage field and lining structure external water pressure under different grouting ring parameters and lining drainage conditions in the deep-buried water diversion tunnel. Based on the results, proposals for optimizing the design of surrounding rock consolidation grouting and lining drainage were presented. The research findings revealed that setting grouting rings and lining drainage holes in the surrounding rock could effectively reduce the external water pressure on the lining structure. The thicker the grouting ring was, the smaller the permeability coefficient was, and the better the water plugging effect was. The more drainage holes in the lining, the smaller the external water pressure on the lining structure, but the safety of the lining should be considered when setting the drainage holes. It was recommended that the grouting ring thickness should be set at 6-8 meters, and the grouting ring conductivity coefficient should be set at 1/60 to 1/40 of the permeability coefficient of the surrounding rock. The number of drainage holes should be set at 2-3, which was a more reasonable design range.
王新越, 王如宾, 王丹, 向天兵, 王鹏, 黄威, 张建平, 徐卫亚. 滇中引水松林隧洞高外水压力作用数值模拟分析[J]. 隧道与地下工程灾害防治, 2023, 5(4): 72-80.
WANG Xinyue, WANG Rubin, WANG Dan, XIANG Tianbing, WANG Peng, HUANG Wei, ZHANG Jianping, XU Weiya. Numerical simulation analysis of high external water pressure effect in Songlin Tunnel of Central Yunnan Water Diversion. Hazard Control in Tunnelling and Underground Engineering, 2023, 5(4): 72-80.
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2023, Vol. 5 
