不同几何特征结构面岩体冲击动态响应的数值模拟研究

Numerical simulation of dynamic impact response of rock-mass with different geometric features of structural plane

为研究结构面几何特征不同时的岩体冲击动态响应,借助ABAQUS分析平台进行了数值模拟研究。建立三组平面应力状态模型,模拟冲击荷载作用,分析结构面几何特征厚度、长度、曲率变化时,应力值在特定路径上的衰减规律,应力值、应变能的变化情况。结果表明:在以端部起点竖直向下的分析路径上,Mises应力值以所拟合的函数关系式衰减;随着结构面厚度的增大,下部分析点处的应力值水平有所降低;随着结构面长度的增加,可以在应力云图中观察到应力波的透射现象;随着结构面曲率的减小,两端分析点的应力值上升速度增大,应变能与应力值变化趋势保持协同。由此可知:在所选分析路径上,应力值以特定的函数关系式衰减;结构面几何特征厚度、长度影响结构面下部的应力值的增减;曲率影响结构面两端的应变能聚集快慢。

In order to study the dynamic response of rock-mass when the geometric features of the structural plane are different,a numerical simulation study is conducted with the help of the ABAQUS analysis platform.Three sets of plane stress state models are established to simulate the impact load and to analyze the change of the stress value on a specific path when the geometric features of the structural surface change,and the changes of stress value and strain energy.The results show that on the selected analysis path,the Mises stress value is attenuated by the fitted functional relationship.As the thickness of the structural plane increases,the stress level at the down analysis point decreases,as the length increases,the transmission of stress waves can be observed in the stress cloud,as the curvature decreases,the rate of increase of the stress value increases,and the change trend of the strain energy and stress value remains synergy.It can be seen that on the analysis path,the stress value attenuates with a specific functional relationship,the thickness and length affect the increase or decrease of the stress value at the down analysis point,curvature affects the strain energy gathering speed.