深竖井破碎岩层围岩应力分析模型探讨

岩层的层理性结构使其力学特征具有各向异性，而节理裂隙发育的破碎岩层，其具有更明显的各向异性。深竖井井壁围岩应力高，易发生破坏。与均质各向同性岩层不同，破碎岩层井壁围岩的稳定性主要取决于结构面的抗滑能力。这类岩层的自稳能力差，当围岩应力超过单元体结构面强度时，围岩便失稳垮塌。鉴于岩层本身、环境及施工等因素的影响，破碎岩层的围岩应力复杂多变，如何快速而相对准确地确定破碎岩层的围岩应力即成为井筒支护的关键环节。从破碎岩层的成因出发，分别给出破碎岩层、断层、软弱夹层的围岩应力的分析模型，对深竖井破碎岩层段井筒支护的合理设计具有较为重要的指导作用。

Discussion of analysis model for Surrounding Rock Stress of Deep Shaft Broken Formation

The stratigraphic structure of bedding formations with its mechanical characteristics can show anisotropy. And the broken formation which has rich joint fissure has more obvious anisotropy. The surrounding rock stress of the deep shaft is high, so it is prone to cause damage. Different from the homogeneous isotropic strata, the stability of the surrounding rock of the fractured stratum mainly depends on the anti-sliding ability of the structural plane. The self-stability of such stratum is poor. When the surrounding rock stress exceeds the structural strength of the unit body, the rock will be instability and collapse. In view of the influence of rock formation, environment and construction, the surrounding rock stress of the fractured stratum is complex and variable. The surrounding rock stress of the fractured stratum, which is obtained quickly and relatively accurately, will be the key link of the shaft support. According to the genesis of the fractured stratum, the analysis model of surrounding rock stress for the fractured stratum, fault and weak interlayer are given respectively, which has an important guiding role for the rational design of the shaft support in the fractured stratum of the deep shaft.