岩土力学 ›› 2020, Vol. 41 ›› Issue (S1): 171-178.doi: 10.16285/j.rsm.2019.1191

• 基础理论与实验研究 • 上一篇    下一篇

卸压孔劈裂局部解危效应试验研究

张晓君1, 2,李晓程1,刘国磊1, 2,李宝玉1, 2   

  1. 1. 山东理工大学 资源与环境工程学院,山东 淄博 255049;2. 山东理工大学 矿山工程技术研究所,山东 淄博 255049
  • 收稿日期:2019-07-06 修回日期:2019-10-09 出版日期:2020-06-19 发布日期:2020-06-09
  • 作者简介:张晓君,男,1975年生,博士,副教授,主要从事岩土工程与采矿工程方面的教学和研究工作
  • 基金资助:
    山东省自然科学基金项目(No.ZR2016EL06,No.ZR2018BEE009,No.ZR2018PEE003);山东省地下水资源与环境工程研究中心开放基金项目(No.2017KF003)。

Experimental study on the effect of local risk reduction of pressure relief hole for splitting

ZHANG Xiao-jun1, 2, LI Xiao-cheng1, LIU Guo-lei1, 2, LI Bao-yu1, 2   

  1. 1. School of Resources and Environment, Shandong University of Technology, Zibo, Shandong 255049, China; 2. Institution of Mining Engineering and Technology, Shandong University of Technology, Zibo, Shandong 255049, China
  • Received:2019-07-06 Revised:2019-10-09 Online:2020-06-19 Published:2020-06-09
  • Supported by:
    This work was supported by Natural Science Foundation of Shandong Province(ZR2016EL06,ZR2018BEE009,ZR2018PEE003) and Open Foundation of Ground Water Resources and Environmental Engineering Research Center of Shandong Province (2017KF003).

摘要: 针对岩爆局部解危,提出在施工卸压孔基础上将卸压孔劈裂的局部解危方法,结合应变和声发射监测技术开展具有岩爆倾向性的卸压孔劈裂试样双轴压缩试验。结果表明,与单纯施工卸压孔相比,含0o、45o劈裂缝的围岩局部解危演化进程由卸压孔两帮控制转为由劈裂缝端部控制,扩大了局部解危区域,卸压孔和劈裂缝共同起局部解危作用;含90o劈裂缝的围岩局部解危进程仍由卸压孔两帮控制,含0o、45o劈裂缝的峰前应力与垂直应变关系曲线非线性特征增强,峰前能量耗散加大,更大程度地降低了围岩完整性,起到明显卸压效果;相比较而言,0o劈裂缝的局部解危效果最好,其峰前能量释放占比达到85.70%,45o次之,90o较差。研究结果对岩爆防控具有很好的指导和借鉴意义。

关键词: 岩爆, 卸压孔, 劈裂, 双轴压缩试验, 声发射

Abstract: To solve the partial danger release of rock burst, a partial risk reduction method that creates cracks in the foundation of the pressure relief hole was proposed. A double-axis compression test of the specimen with the tendency of rock burst was carried out in combination with strain gauge and acoustic emission(AE) monitoring techniques. The results show that compared with the simple pressure relief hole, the control of the process of local de-danger evolution of surrounding rock containing 0° and 45° split cracks is changed from two sides of decompression holes to the end of the split fracture, which expands the decompression area, and the decompression hole work together with the split cracks. The nonlinear characteristics of the relation curve between the stress and vertical strain before the peak are enhanced. The energy dissipation prior to the peak is enhanced, but the integrity of the surrounding rock is reduced to a greater extent, which means the effect of decompression is obvious. The process of local de-danger evolution of surrounding rock containing 90° split cracks is still controlled by the two sides of decompression holes. The local de-danger effect of 0° split crack is demonstrated as the best one with the pre-peak energy release of 85.70%, followed by those with 45° and 90° split cracks. The results provide valuable guidance and reference for rock burst prevention and control.

Key words: rock burst, pressure relief hole, split, biaxial compression test, acoustic emission

中图分类号: 

  • TU452
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