复杂预应力路径和异源动力扰动下岩石破裂机制研究

doi:10.13722/j.cnki.jrme.2015.0982

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摘要地下工程围岩承受载荷的形式为真三轴卸–加载后的扰动载荷，在频繁扰动载荷作用下围岩易出现物理力学性能劣化，进而诱发岩爆等工程灾害。基于地下工程围岩复杂受力环境，利用自制的岩石真三轴扰动诱变试验系统，开展复杂真三轴预应力路径和局部异源扰动载荷作用下花岗岩破裂试验。试验结果表明，在特定的应力状态下，在较大幅值的局部异源扰动载荷下花岗岩发生剧烈破坏，破裂模式为劈裂拉伸破坏。利用PFC3D精确再现室内试验并研究岩石扰动破裂的微观机制，研究结果表明：岩石内部的颗粒黏结从扰动载荷作用处开始破坏，当扰动载荷的幅值为150，200，250 kN时，破坏颗粒黏结数趋于稳定，最终岩石未发生整体破坏；但扰动载荷幅值等于300 kN时，破坏黏结数从施加扰动载荷位置扩散至试件整体，岩石扰动破坏由剪切破坏逐渐转变为拉伸破坏，最后发生试件整体破坏，室内试验与数值模拟结果相一致。

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	陶明2
	周健2

关键词 ：岩石力学, 真三轴卸载, 扰动载荷, 破裂机制

Abstract：The force form of the surrounding rocks in underground engineering is coupled static-dynamic loads after true triaxial unloading-loading. The mechanical properties of the surrounding rock under frequent disturbance are easy to be degraded，which can induce engineering disasters such as rock burst and so on. Based on the complex stress environment of surrounding rocks，rock failure tests under the complex true triaxial pre-stressed path and local dynamic disturbance were carried out. The test results show that rock failure occurred when the amplitude of the local dynamic load was in a relatively large level，and the failure mode is splitting tensile failure. PFC3D was used to reappear the lab experiment and study the microscopic characteristics of rock failure under dynamic disturbance. When the amplitude of the local dynamic load was less than 250 kN，both shear cracks and tensile cracks were triggered and their number keep stable. When the amplitude of the local dynamic load was 300 kN，the shear cracks and the tensile cracks spread from the perturbation load position to the entire specimen. The number of tensile cracks exceeded the number of shear cracks while the rock got final failure. The results of lab test and simulation are consistent.

Key words： rock mechanics true triaxial unloading dynamic load failure mechanism

引用本文:

杜坤1，2，3，李夕兵2，董陇军2，陶明2，周健2. 复杂预应力路径和异源动力扰动下岩石破裂机制研究[J]. 岩石力学与工程学报, 2015, 34(S2): 4047-4053.
DU Kun1，2，3，LI Xibing2，DONG Longjun2，TAO Ming2，ZHOU Jian2. FRACTURE MECHANISM OF ROCK INDUCED BY TRUE-TRIAXIAL UNLOADING AND HETEROLOGY DYNAMIC DISTURBANCE. , 2015, 34(S2): 4047-4053.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.0982 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/IS2/4047

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