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| 梯度应力作用下模型试件的岩爆破坏细观分析 | |
| 引用本文： | 吝曼卿,张兰,刘夕奇,夏元友,张电吉,彭亚利. 梯度应力作用下模型试件的岩爆破坏细观分析[J]. 岩土力学, 2020, 41(9): 2984-2992. DOI: 10.16285/j.rsm.2019.2136 |
| 作者姓名： | 吝曼卿 张兰 刘夕奇 夏元友 张电吉 彭亚利 |
| 作者单位： | 1. 武汉工程大学 资源与安全工程学院，湖北 武汉430074；2. 武汉理工大学 土木工程与建筑学院，湖北 武汉430070；3. 湖北兴发化工集团股份有限公司，湖北 宜昌 443711 |
| 基金项目： | 国家自然科学基金（No.51504167，No.51474159）；武汉工程大学研究生创新基金项目（No.CX2018083）；2018年第一批产学合作协同育人项目（No.201801081001）；武汉工程大学校基金（No.K201856）；湖北省中央引导地方科技发展专项（No.2017ZYYD007）。 |
| 摘 要： | 岩爆是深部矿山开采亟待解决的安全问题,而应力梯度是影响岩爆的重要因素。为探究不同应力梯度的岩爆对围岩内部细观结构的影响,利用可实现三向六面加载及顶部梯度加载的气液复合型岩爆试验装置,对类岩体进行不同应力梯度条件下的岩爆物理模型加卸载试验,并借助扫描电镜对试件破坏面进行细观形貌特征分析。研究结果表明:不同应力梯度环境下试件岩爆的破坏现象与特征存在明显差异;试件所受的应力梯度越大,岩爆后的细观图像显示的晶体间孔隙越小,晶体的密实程度越高;不同应力梯度下试件产生剪切和劈裂破坏比例不同,应力梯度越大,剪切破坏比例越大;岩爆碎屑晶体轮廓具有分形特征,且随着试件所受的应力梯度的增加,其分形维数相对越大。 |
| 关 键 词： | 应力梯度 岩爆 破坏特征 细观分析 分形维数 |
| 收稿时间： | 2019-12-22 |
| 修稿时间： | 2020-06-12 |
Microscopic analysis of rockburst failure on specimens under gradient stress |
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| LIN Man-qing,ZHANG Lan,LIU Xi-qi,XIA Yuan-you,ZHANG Dian-ji,PENG Ya-li. Microscopic analysis of rockburst failure on specimens under gradient stress[J]. Rock and Soil Mechanics, 2020, 41(9): 2984-2992. DOI: 10.16285/j.rsm.2019.2136 | |
| Authors: | LIN Man-qing ZHANG Lan LIU Xi-qi XIA Yuan-you ZHANG Dian-ji PENG Ya-li |
| Affiliation: | 1. School of Resources and Safety Engineering, Wuhan Institute of Technology, Wuhan, Hubei 430074, China;2. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, Hubei 430070, China;3. Hubei Xingfa Chemical Group Co. Ltd, Yichang, Hubei 443711, China |
| Abstract: | Rockburst has become an urgent safety problem in deep mining, and stress gradient plays a significant role in controlling rockburst. To explore the influence of stress gradients on the microscopic failure of surrounding rock, a pneumatic-hydraulic coupled rockburst simulation testing device was used to achieve six-sides loading in three-directions and the gradient loading in the top direction. When the gradient loading was applied at the top, the confining pressure was kept unchanged. Loading-unloading tests were carried out on rock similar material specimens by using rockburst physical models under different stress gradients. The analysis of microscopic morphology of failure surface was conducted using the scanning electron microscope (SEM). The results showed that failure phenomena and characteristics of rockburst were significantly different under varied paths of stress gradient. The greater the stress gradient is, the smaller the pores among the crystals is and the higher the density of the crystals is. The ratio of shear failure to splitting failure is different under different stress gradient paths. The higher the stress gradient is, the greater the ratio of shear failure is. The fractal dimension of detrital crystal contour increases with the increase of stress gradient. |
| Keywords: | stress gradient rockburst failure characteristics microscopic analysis fractal dimension |
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