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Model experiment on dynamic behavior of jointed rock mass under blasting at high-stress conditions

机译：节理岩体在高应力条件下爆破动力特性的模型试验

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摘要

The blasting response of jointed rock mass under high-stress conditions is studied in a laboratory experiment using model specimens. The crack initiation mode and initiation angle at the joint are analyzed, as well as the stress intensity factor and crack velocity. The blasting stress wave increases the stress concentration at the joint which promotes crack initiation and propagation. The dynamic behavior of the crack can be divided into two stages - the initiation stage and the propagation stage. The theoretical criterion based on the minimum strain energy density factor can well predict and explain the crack initiation behavior under blasting loading. The high-stress condition enhances the degree of shear failure of the crack initiation at the joint, which has significant effects on the dynamic behavior of subsequent crack propagation and leads to larger crack initiation angles.
机译：节理岩体在高应力条件下的爆破响应在室内实验中使用模型样本进行了研究。分析了接头处的裂纹萌生方式和萌生角度，以及应力强度因子和裂纹速度。爆破应力波增加了接头处的应力集中，从而促进了裂纹的萌生和扩展。裂纹的动态行为可以分为两个阶段-初始阶段和扩展阶段。基于最小应变能密度因子的理论标准可以很好地预测和解释爆破载荷作用下的裂纹萌生行为。高应力条件提高了接头处裂纹萌生的剪切破坏程度，这对后续裂纹扩展的动力学行为具有重大影响，并导致更大的裂纹萌生角度。

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