深部工程围岩松动圈范围确定及变形破坏机理  

Range Determination and Deformation Failure Mechanism of Loosening Zone of Surrounding Rock in Deep Engineering

作　　者：钱蓉 邓树新[1] 王明洋[1,2] 邱艳宇 QIAN Rong;DENG Shuxin;WANG Mingyang;QIU Yanyu(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact,Army Engineering University of PLA,Nanjing 210007,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094 [2]陆军工程大学爆炸冲击防灾减灾国家重点实验室,江苏南京210007

出　　处：《同济大学学报（自然科学版）》2023年第6期839-845,共7页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金青年基金(51909120)。

摘　　要：随着埋深增加,深部工程围岩在开挖后应力重分布形成支撑压力区,破坏后将形成新的破裂面,稳定的支撑压力区即为围岩的松动圈。围岩松动圈范围的确定以及变形破坏机理的研究,关乎围岩变形稳定控制支护的方式方法。利用围岩的平衡方程和泰勒展开方法,得到松动圈的初始半径,并采用Maxwell方程来表征岩体中缺陷应力演化,推导了围岩松动圈发生劈裂破坏的条件。As the burial depth increases,the stress redistribution of surrounding rock in deep engineering forms a supporting pressure zone after excavation,and a new fracture surface will be formed after failure.The stable support pressure zone is the loosening zone of the surrounding rock.The determination of the scope of the loosening zone of the surrounding rock and the study of the deformation and failure mechanism are related to the methods of the deformation stability control and support of the surrounding rock.In this paper,the equilibrium equation of the surrounding rock and the Taylor expansion method are used to obtain the initial radius of the loose zone,the Maxwell equation is used to characterize the evolution of defect stress in the rock mass,and the conditions for the cracking and failure of the loose zone of the surrounding rock are derived.The research results are of guiding significance to the stability analysis of underground roadways and the design of surrounding rock support.

关 键 词：支撑压力区 围岩松动圈 围岩分区破裂 

分 类 号：O38[理学—流体力学]