单裂隙岩体水-力耦合数值分析

Numerical analysis of hydraulic-mechanical coupling in single fracture rock mass

随着地下工程的不断发展,诸多地下工程在水-力耦合作用下发生失稳破坏,裂隙岩体水-力耦合一直是国内外学者研究的热点问题。基于单裂隙岩体水-力耦合概念模型,应用离散元程序计算分析裂隙水压强、岩体应力对裂隙渗流场和岩体位移场的影响。计算发现:模型约10 s后达到稳态,节理流体形成从左向右的渗流场,节理入口处流体压强与节理流体压力梯度成正相关;节理岩体位移主要形成从节理入口处向其周边辐射的位移场,节理入口处流体压强与节理岩体位移梯度成正相关;节理岩体水压主要形成从节理中部区域处向其周边辐射的水压场,岩体顶部施加向下应力与节理水压梯度成正相关。研究结果对解决地下工程水-力耦合问题具有一定的科学意义和工程价值。

With the continuous development of underground engineering,many underground engineering failures occur under the action of water-force coupling.The water-force coupling of fissured rock mass has always been a hot topic studied by scholars at home and abroad.Based on the concept model of water-force coupling in single fis-sure rock mass,the influence of fracture water pressure and rock mass stress on seepage field and rock mass displacement field calculated by using discrete element program.It was found that the model reached steady state about 10 seconds later,and the joint fluid formed a seepage field from left to right.The fluid pressure at the joint entrance was positively correlated with the pressure gradient of the joint fluid.The displacement of jointed rock mass mainly formed a displacement field radiating from the joint entrance to its periphery,and the fluid pressure at the joint entrance was positively correlated with the displacement gradient of jointed rock mass.The displacement of jointed rock mass mainly formed a water pressure field radiating from the middle area of the joint to its periphery,and the downward stress applied on the top of the rock mass was positively correlated with the joint water pressure gradient.The research results have certain scientific significance and engineering value for solving the hydraulic-mechanical coupling problem in underground engineering.