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

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。

关键词:支撑压力区;围岩松动圈;围岩分区破裂

Abstract:

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.

Key words:support pressure zone;surrounding rock loose circle;partition fracture of surrounding rock