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| 双轴加载下大尺寸岩石裂隙演化规律试验 |
| Experimental research on rock cracks propagationevolution under different biaxial loading |
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| DOI： |
| 中文关键词: 双轴加载 加载速率 大尺寸 裂隙演化 |
| 英文关键词: biaxial loading loading rate large size crack evolution |
| 基金项目:国家自然科学基金资助项目(51604167);中国博士后科学基金资助项目(2016M601171);矿山灾害预防控制省部共建国家重点实验室培育基地开放课题基金资助项目(MDPC2016ZR01);河南省矿产资源绿色高效开采与综合利用重点实验室开放基金资助项目(S201610);山东科技大学人才引进科研启动基金资助项目(2015RCJJ043) |
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| 摘要点击次数: 2319 |
| 全文下载次数: 2406 |
| 中文摘要: |
| 为准确掌握深部岩体的破裂过程中失稳机制,对大尺寸试样进行了不同加载速率下的双轴加载试验,分析了试件破裂过程中裂隙演化规律和声发射行为特征.在大量试验的基础上,选取了由425硅酸盐水泥、砂子(粒径≤2 mm)、石膏、高效减水剂和水组成的砂浆材料,确定了各组分的最优配比.借助岩石应力-渗流耦合真三轴试验系统和PCI-2声发射监测系统,分析了不同加载速率对大尺寸试样裂隙演化的影响规律和破裂的声发射行为特征.结果表明:加载速率越大,大尺寸试样越容易产生反翼裂隙,发生突变性剪切破坏,而不同加载速率下试样破裂的声发射行为特征基本相似,当加载到90%σc时,声发射事件累计数瞬时增多,表现为裂隙的瞬时扩展贯通,导致试样最终破裂. |
| 英文摘要: |
| To accurately grasp the failure mechanism of deep rock mass, the large size specimens made by rock-like material were compressed under different biaxial loading rates, and the AE (Acoustic Emission) behavior characteristics of specimens crack propagation were analyzed. Based on plenty of experimental data from previous research, the 425 portland cement, sand with particle size less than 2 mm , gypsum, water-reducer and water were chosen as rock-like material, and optimal proportion of various components was obtained by orthogonal test. Then, the influence law of different biaxial loading rates on crack evolution to large size specimens was analyzed together with its AE behavior characteristics, applying the true triaxial rock test system of coupled stress-seepage and PCI-2 real-time monitoring system of AE. The results showed that the larger loading rate, the much easier anti-wing cracks appeared so that sudden shear failure happened in specimens. However, the AE behavior characteristics of specimen failure under different biaxial loading rates are similar. The cumulative AE events abruptly increase when the load is to 90%σc, showing the cracks transfixionat due to propagation which resulte in specimens fracture. |
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