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动载扰动作用是影响遗煤复采过程中围岩稳定性的重要因素，为研究不同预静载水平下动载扰动对砂岩抗剪强度、黏聚力、内摩擦角、应变场及声发射等参数的影响，采用动静载多场耦合试验系统、声发射监测系统和DIC应变监测系统对砂岩进行了动静组合加载变角剪切试验。研究结果表明：在组合加载下，随着预静载水平的增大，砂岩抗剪强度和黏聚力呈先增大后减小的趋势，内摩擦角和扰动前后最大主应变差值呈先减小后增大的趋势，均在75%τ预静载水平处达到极值；在组合加载下，声发射累计能量和累计振铃计数整体上可划分为第一稳定增长期、第一突增期、平静期、第二突增期、第二稳定增长期和第三突增期6个阶段，在扰动阶段声发射信号活跃程度随着预静载水平的增大呈先减小后增大的趋势，极值出现在60%τ预静载水平处。研究成果可为动静组合加载下围岩稳定性控制提供理论参考。
Abstract：The effect of dynamic load disturbance is an important factor affecting the stability of surrounding rock during the remining process of relict coal. In order to investigate the effects of dynamic load disturbance on the shear strength, shear mechanical parameters, surface strain field and acoustic emission characteristic parameters of sandstone under different pre-static load levels, acoustic emission monitoring system, DIC strain monitoring system and self-developed dynamic and static load multi-field coupling test system were used to carry out variable-angle shear tests on sandstone under coupled dynamic and static loading. The results show that under the combined loading, the shear strength and cohesion of sandstone firstly increase and then decrease with the increase of preload level, while the internal friction angle and the maximum principal strain difference before and after disturbance firstly decrease and then increase, and both of them reach extrema at preload level of 75% shear strength. Overall, the evolution of cumulative acoustic emission energy and the cumulative ringing counts appear to be six phases under the combined loading: The first stable growth period, the first surge period, the calm period, the second surge period, the second stable growth period, and the third surge period. In the perturbation phase, the acoustic emission signal activity level shows a tendency of decreasing and then increasing with the increase of the pre-static loading level, with the extremum appearing at the pre-static loading level of 60% shear strength. The research results can provide some certain reference for the ground control of disturbed surrounding rock under combined static and dynamic loading.
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基本信息:
DOI：10.13532/j.jmsce.cn10-1638/td.2024.04.001
中图分类号:TD315
引用信息:
[1]龚昌建,冯国瑞,张玉江,等.动静组合加载下砂岩剪切力学特性试验研究[J].采矿与岩层控制工程学报,2024,6(04):52-65.DOI:10.13532/j.jmsce.cn10-1638/td.2024.04.001.
基金信息:
国家自然科学基金资助项目(51925402,52004172);; 山西省科技重大专项资助项目(20201102004)