摘要:
为了研究岩体孔隙-裂隙双重介质渗流过程中速度变化、压力分布和不同形状裂隙影响的规律,采用COMSOL数值模拟软件对不同断裂形状的多孔介质块进行了渗流数值模拟,得到了裂隙速度场、基质块孔隙压力场和不同形状路径渗流影响的规律。结果表明:随着压力差的增大,沿裂隙路径上速度场发展最快,裂隙成为主要的渗流途径;基质块孔隙压力梯度分布均匀,压力分布在断裂的基质块中是连续的,但等压面的弯曲表明了裂隙和孔隙的不同流动状态;裂隙形状影响着流动特性,4种类型裂隙出口边界通量的大小关系为:圆角>135°夹角>90°夹角>45°夹角,模拟结果有助于可视化地研究双重介质的渗流规律。
Abstract:
To study the velocity variation, pressure distribution and the influence of different shape fissures on the seepage process of pore-fracture dual media in rock mass, the numerical simulation of seepage of porous media blocks with different fracture shapes was carried out by COMSOL numerical simulation software. The laws of the crack velocity field, the pore pressure field of the matrix block and the seepage of different shape paths are obtained. The results show that with the increase of pressure difference, the velocity field develops fastest along the fracture path, and the fracture becomes the main seepage path; the pore pressure gradient in the matrix block is evenly distributed, and the pressure distribution is continuous in the fractured matrix block, but the bends in the barometric surfaces indicate different flow states in the fracture and the pore; the fracture shape affects the flow characteristics, and the magnitude of the outlet boundary flux of the four types of fractures is: the rounded shape > 135° angle> 90° angle>45° angle. The simulation results are helpful to visually study the seepage law of dual media.
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