复杂裂隙岩体力学特性的数值试验研究

Numerical Test on Mechanical Behavior of Complicated Fractured Rock Mass

复杂结构面的模拟方法是裂隙岩体数值试验的关键技术之一。首先,利用ANSYS软件前处理功能和FLAC3D软件灵活的接触面生成功能,探索复杂裂隙岩体数值模型的构建方法;其次,利用数值试验方法对多结构面层状及柱状岩体的力学性质进行了单轴压缩研究,揭示了复杂层状及柱状岩体弹性模量及抗压强度的结构面倾角效应和尺寸效应,以及复杂岩体应力应变关系存在的差异性。数值试验结果表明,相同受力条件下结构面倾角的大小对裂隙岩体的变形特性有一定的影响,层状岩体或柱状岩体的单轴抗压强度及弹性模量会随试件尺寸的增大而变小并逐步趋向稳定。

The modeling of complex structural planes in rock mass is a key technique in the numerical test of fractured rock mass.A numerical model for the structural planes in rock mass is established by means of the pre-processing of ANSYS software and the flexible interface generation of FLAC3D software.The model is employed to numerically simulate the mechanical behaviors of layered and columnar rock masses with complex structural planes under uniaxial compression.The regularity of structural plane＇ s dip angle and specimen＇ s size respectively affecting the elastic modulus and compression strength of layered and columnar rock mass is obtained.The relations between stress and strain of different rock masses are different.The result also shows that under the same stress,the dip angle of structural plane has influence on the deformation behavior of fractured rock mass.The uniaxial compressive strength and elastic modulus of layered and columnar rock mass decrease and then gradually stabilize with the increase of specimen size.