论文部分内容阅读
节理岩体中富含结构面等不连续体,其中很多结构面之间具有一定黏结强度,在冲击荷载作用下会发生脱结(debond)行为,从而消耗岩体应变能。在该结构面之间的黏结性质在很大程度上决定着岩体的破坏行为,发生脱结后,结构面之间不再具有黏结强度,岩体的力学性能发生弱化。为了对该类结构面进行模拟,在改进的Xu-Needleman势函数基础上推导出结构面单元,并将其嵌入到单元劈裂法中,模拟结构面的开裂过程,当结构面完全脱结后结构面单元就转化为一般节理单元。相应地,在数值实现过程中只是将结构面单元替换为一般节理单元即可。该结构面单元与单元劈裂法相结合,能够有效地模拟节理岩体的破坏过程。
The jointed rock mass is rich in discontinuities such as the structural surface. Many of the structural surfaces have a certain bond strength and debond behavior under the impact load, so the strain energy of the rock mass is consumed. The nature of the bond between the structural surfaces determines the failure behavior of the rock mass to a great extent. After the structural detachment occurs, the cemented structures no longer have the bond strength and the mechanical properties of the rock mass are weakened. In order to simulate this type of structural plane, the structural plane element is derived based on the improved Xu-Needleman potential function and embedded into the cell splitting method to simulate the cracking process of the structural plane. When the structural plane is completely decoupled Structural plane elements are transformed into general joint elements. Accordingly, it is only possible to replace the structural plane elements with the general joint elements in the numerical implementation. The combination of structural plane element and element splitting method can effectively simulate the failure process of jointed rock mass.