An extended discontinuous deformation analysis for simulation of grouting reinforcement in a water-rich fractured rock tunnel  

作　　者：Jingyao Gao Siyu Peng Guangqi Chen Hongyun Fan 

机构地区：[1]Department of Civil and Structural Engineering,Kyushu University,Fukuoka,819-0395,Japan [2]School of Resources and Safety Engineering,Central South University,Changsha,Hunan,410083,China [3]School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin,300401,China [4]School of Qilu Transportation,Shandong University,Jinan,Shandong,250000,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2025年第1期168-186,共19页岩石力学与岩土工程学报(英文)

基　　金：supported by the China Scholarship Council(CSC,Grant No.202108050072);JSPS KAKENHI(Grant No.JP19KK0121)。

摘　　要：Grouting has been the most effective approach to mitigate water inrush disasters in underground engineering due to its ability to plug groundwater and enhance rock strength.Nevertheless,there is a lack of potent numerical tools for assessing the grouting effectiveness in water-rich fractured strata.In this study,the hydro-mechanical coupled discontinuous deformation analysis(HM-DDA)is inaugurally extended to simulate the grouting process in a water-rich discrete fracture network(DFN),including the slurry migration,fracture dilation,water plugging in a seepage field,and joint reinforcement after coagulation.To validate the capabilities of the developed method,several numerical examples are conducted incorporating the Newtonian fluid and Bingham slurry.The simulation results closely align with the analytical solutions.Additionally,a set of compression tests is conducted on the fresh and grouted rock specimens to verify the reinforcement method and calibrate the rational properties of reinforced joints.An engineering-scale model based on a real water inrush case of the Yonglian tunnel in a water-rich fractured zone has been established.The model demonstrates the effectiveness of grouting reinforcement in mitigating water inrush disaster.The results indicate that increased grouting pressure greatly affects the regulation of water outflow from the tunnel face and the prevention of rock detachment face after excavation.

关 键 词：Discontinuous deformation analysis(DDA) Water-rich fractured rock tunnel Grouting reinforcement Water inrush disaster 

分 类 号：TU433[建筑科学—岩土工程]