节理分布特征及结构面强度对岩体力学性能的影响研究

为研究节理结构面强度及节理分布特征对岩体力学性能的影响，在PFC中构建了基于

块体语义分割方法的节理岩体数值模型。基于不同节理黏结强度缩放系数f和分割迭代次数n的节理

参数组合，以节理岩体单轴抗压强度为分析指标展开模拟。研究结果表明，节理分割迭代次数n较小

时，节理强度缩放系数f对岩体单轴抗压强度σu影响不大；当n=4和6时，岩体单轴抗压强度σu随节理

强度缩放系数f的增大，首先出现明显的增长趋势，后逐渐稳定，但相较于无节理单轴强度仍存在一定

差距；当n=8时，节理数量逐渐增大，岩体单轴抗压强度随n的变化幅度最大，但最终同样稳定至无节

理岩体单轴强度；随着节理强度缩放系数f的增大，节理黏结强度增加，岩体单轴抗压强度σu随节理分

割迭代次数n的增大逐渐增大，且最终向无节理岩石的力学强度靠近。基于不同f与n的组合，探究不

同节理参数下岩体单轴抗压强度，为节理岩体力学性能的快速确定提供准确有效的模拟预测方法。

In order to study the influence of joint structural plane strength and joint distribution char⁃

acteristics on the mechanical properties of rock mass，a numerical model of jointed rock mass based on

block semantic segmentation method is constructed in PFC. Based on the combination of joint parameters

with different joint bond strength scaling coefficient f and segmentation iteration number n，the uniaxial com⁃

pressive strength of jointed rock mass is simulated as the analysis index. The results show that when the num⁃

ber of nodal splitting iterations n is small，the nodal strength scaling factor f has little effect on the uniaxial

compressive strength σu of the rock body. when n=4 and 6，the uniaxial compressive strength σu of the rock

body firstly shows an obvious increasing trend with the increase of the nodal strength scaling factor f，and

then stabilizes gradually，but there is still a certain gap in comparison with the uniaxial strength of no-nod⁃

al. When n=8，the number of joints increases gradually，and the uniaxial compressive strength of rock mass

changes the most with n，but it eventually stabilizes to the uniaxial strength of jointless rock mass. With the

increase of the joint strength scaling factor f，the joint bond strength increases，and the uniaxial compressive

strength σu of the rock mass gradually increases with the increase of the number of joint segmentation itera⁃

tions n，and finally approaches the mechanical strength of the jointless rock. Based on the combination of dif⁃

ferent f and n，the uniaxial compressive strength of rock mass under different joint parameters is explored，

which provides an accurate and effective simulation prediction method for the rapid determination of me⁃

chanical properties of jointed rock mass.

摘要：