高轴向应力下围岩环状破裂模式及其影响因素

doi:10.12068/j.issn.1005-3026.2018.04.022

东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (4): 564-569.DOI: 10.12068/j.issn.1005-3026.2018.04.022

高轴向应力下围岩环状破裂模式及其影响因素

贾蓬，秦兵，王良，刘志超

(东北大学资源与土木工程学院，辽宁沈阳110819)

收稿日期:2016-11-06 修回日期:2016-11-06 出版日期:2018-04-15 发布日期:2018-04-10
通讯作者: 贾蓬
作者简介:贾蓬(1973-)，女，内蒙古呼和浩特人，东北大学副教授，博士.
基金资助:
国家自然科学基金资助项目(51171041).国家自然科学基金资助项目(51304036)；辽宁省自然科学基金指导计划项目(201602251).

Toroidal Fracturing Mode in Surrounding Rock Mass and Its Impact Factors Under High Axial Stress

JIA Peng， QIN Bing， WANG Liang， LIU Zhi-chao

School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.

Received:2016-11-06 Revised:2016-11-06 Online:2018-04-15 Published:2018-04-10
Contact: JIA Peng
About author:-
Supported by:
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摘要/Abstract

摘要： 采用厚壁钢桶约束的含预制孔洞模型的轴向加载试验，研究在有围压高轴向应力条件下，洞壁围岩的环状破裂模式及其影响因素.试验结果表明:环状破裂是从洞壁剪切破坏带相互交割处开始，向远离洞壁方向开展的以拉为主的破裂，其在洞壁附近近似平行于洞壁临空面.对于近距离双洞隧道，由于两洞间应力场叠加强烈，在高轴向应力下，环状破裂将环绕两洞，呈椭圆形发展;当两洞距离较远，两洞间应力场叠加较弱时，环状破裂带将分别围绕单洞扩展.环状破裂的形成及破裂带间距与洞壁曲率、隧道断面尺寸和岩石材料非均匀性有关.

关键词: 深部岩体, 轴向应力, 环状破裂, 高边墙隧道, 非均匀性

Abstract: Hole containing cylindrical specimens confined by thick steel drum were compressed in the axial direction to investigate the development of toroidal fractures and its impact factors under high axial stress. Results showed that toroidal fractures develop from the intersection of shear-slip lines and propagate sub-parallelly away from tunnel boundary mainly in tension. For the close twin tunnel with overlapped concentrated stress in between， the toroidal fractures enclose the twin tunnel and take on an elliptical shape; for distant twin tunnel with little overlapped concentrated stress in between， the toroidal fractures enclose each single tunnel respectively. The shape of toroidal fractures and the distance between the fractures are affected by tunnel curvature and tunnel span as well as the heterogeneity of the rock mass.

Key words: deep rock mass, axial stress, toroidal fractures, high wall tunnel, heterogeneity

中图分类号:

TV554

贾蓬，秦兵，王良，刘志超. 高轴向应力下围岩环状破裂模式及其影响因素[J]. 东北大学学报:自然科学版, 2018, 39(4): 564-569.

JIA Peng， QIN Bing， WANG Liang， LIU Zhi-chao. Toroidal Fracturing Mode in Surrounding Rock Mass and Its Impact Factors Under High Axial Stress[J]. Journal of Northeastern University Natural Science, 2018, 39(4): 564-569.

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高轴向应力下围岩环状破裂模式及其影响因素

Toroidal Fracturing Mode in Surrounding Rock Mass and Its Impact Factors Under High Axial Stress

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