岩土工程
磁导率
地质学
喀斯特
岩体分类
地下水
水力发电
达西定律
多孔介质
多孔性
工程类
古生物学
遗传学
膜
电气工程
生物
作者
Jingqi Jia,Yun Chen,Haoran Luo,Guowei Ma
标识
DOI:10.1016/j.tust.2023.105393
摘要
Non-Darcy seepage commonly occurs in fractured rocks with an adequate groundwater system around deep-buried tunnels. This study develops a numerical method for capturing the non-linear hydro-mechanical coupled processes in a rock mass system comprised of a tunnel lining, grouting circle, and surrounding rocks with discrete fracture networks. The proposed model is validated by comparing it with analytical solutions and field data obtained from a diversion tunnel of the Jinping II Hydropower Station on the Yalong River. The investigation of the non-Darcy flow regions around the diversion tunnel indicates that fractures with relatively higher conductivities dominate the non-Darcy effect, and the highest Forchheimer number reaches 0.5 during the period of torrential rain. The seepage stability of the diversion tunnel lining under three different cases (failure of the seepage control capacity of the grouting circle, potential karst pipeline penetrating the diversion tunnel, and torrential rain attacking the area) is further studied. It is found that the pore pressure at the external edge of the lining increases with the enhancement of the grouting circle permeability, and reaches 2,472.4 kPa when the karst pipeline is connected. Additionally, it is observed that the pore pressures obtained based on the Darcian and non-Darcian assumptions differ by up to 468.8 kPa in Case I. However, the non-Darcy effect gradually decreases as the lining permeability decreases. The results of this study provide practically useful suggestions for the design and operation of diversion tunnels subjected to high water pressure.
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