In engineering blasting, the determination of the range of rock blasting fracture zone has important guiding significance for blasting construction. This paper proposes a method that can accurately and directly obtain the range of rock blasting fracture zone. Based on the theory of elastic wave propagation, test rods which are made of appropriate material are selected and prepared. A certain number of boreholes are drilled for subsequent insertion of the test rods along the direction perpendicular to the free surface of the excavation at a certain distance from the blast hole. Based on the field blasting test results, the deepest fracture position of the test rod is used as the boundary of the blasting fracture zone, and the range of the rock blasting fracture zone is obtained. A numerical analysis model is established according to the Mohr–Coulomb constitutive relationship and the Von Mises yield criterion. Then, the range of the fracture zone and the maximum horizontal radius of the fracture zone are analyzed and obtained. The numerical analysis results are compared with the field measured data. It is demonstrated that the range of the fracture zone obtained by the numerical simulation is in good agreement with the blasting test results of the pre-embedded test rods. The research results can provide references for the safety control of blasting and excavation of rock slopes.

中文翻译：

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爆破荷载作用下岩石边坡断裂带范围的试验方法

在工程爆破中，岩石爆破断裂带范围的确定对爆破施工具有重要的指导意义。本文提出了一种能够准确、直接获取岩石爆破破裂带范围的方法。根据弹性波传播理论，选用合适的材料制作试验棒。钻出一定数量的钻孔，以便随后在距爆破孔一定距离处沿垂直于开挖自由表面的方向插入测试棒。根据现场爆破试验结果，以试棒最深断裂位置为爆破断裂带边界，得到岩石爆破断裂带范围。根据Mohr-Coulomb本构关系和Von Mises屈服准则建立数值分析模型。然后分析得到断裂带的范围和断裂带的最大水平半径。将数值分析结果与现场实测数据进行对比。表明数值模拟得到的断裂带范围与预埋试棒爆破试验结果吻合较好。研究结果可为岩质边坡爆破开挖安全控制提供参考。将数值分析结果与现场实测数据进行对比。表明数值模拟得到的断裂带范围与预埋试棒爆破试验结果吻合较好。研究结果可为岩质边坡爆破开挖安全控制提供参考。将数值分析结果与现场实测数据进行对比。表明数值模拟得到的断裂带范围与预埋试棒爆破试验结果吻合较好。研究结果可为岩质边坡爆破开挖安全控制提供参考。