| 本文已被：浏览 2559次 下载 2778次 |
码上扫一扫！ |
|
|
| 双轴加载下大尺寸岩石裂隙演化规律试验 |
|
陈军涛1,2,3,杨飞1,张呈祥41,2,3,4
|
|
1.山东科技大学 矿山灾害预防控制省部共建国家重点实验室培育基地,山东 青岛 266590;2.中国矿业大学(北京)地球科学与测绘工程学院,北京 100083;3.河南理工大学 河南省矿产资源绿色高效开采与综合利用重点实验室,河南 焦作 454000;4.山东能源集团 淄博矿业集团有限责任公司,山东 淄博 255100
|
|
| 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. |
| 关键词: 双轴加载 加载速率 大尺寸 裂隙演化 |
| DOI： |
| 分类号:TD823 |
| 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) |
|
| Experimental research on rock cracks propagationevolution under different biaxial loading |
|
Chen Juntao1,2,3,Yang Fei1,Zhang Chengxiang41,2,3,4
|
|
1. State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China;2. College of Geosciences and Surveying Engineering,China University of Mining and Technology (Beijing),Beijing 100083,China;3. Henan Key Laboratory for Green and Efficient Mining and Comprehensive Utilization of Mineral Resources,
Henan Polytechnic University,Jiaozuo 454000,China;4. Shandong Energy Zibo Mining Group Co., Ltd, Zibo 255100, China
|
| Abstract: |
| 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. |
| Key words: biaxial loading loading rate large size crack evolution |
