深埋洞室围岩破坏区域碎裂化的非均匀弹性分析

Mechanics Study on Zonal Disintegration of Deep Rock Mass

根据实验研究发现,在深部开挖的围岩中观察到的区域周期结构,是以巷道围岩中的破裂区域和相对完好区域交替出现,这种现象被称为区域碎裂化现象。区域碎裂化现象是深部岩体工程响应的特征和标志,在分析深部岩体工程围岩变形、破裂和稳定性时必须要考虑区域碎裂化现象和破裂区的残余强度,它决定了深部岩体工程开挖、支护方案特点和原理,同时,区域碎裂化现象的产生并不是岩石达到一定深度而产生的突变过程,而是蕴涵着地下工程变形破坏的一种本质特征,只是在一定的应力作用下的明显体现,因此对深部岩体工程区域碎裂化结构形成规律的研究不仅对深部开采具有重要的工程意义,同时也对浅部地下工程建设具有重要的实际意义,本文通过力学分析对区域碎裂化形成机理进行理论研究。

The engineering response of deep rock mass shows several new characteristic scientific phenomena. In comparison with responses of shallow rock engineering, these new characteristic scientific phenomena have distinctive features, and can not be explained by traditional continuum mechanics completely. They attract the attention of scholars and engineers in the fields of geotechnical engineering and rock mechanics in the world, and become the focus of the study in these fields for last several years. In this thesis, we use stress-dependent modulus elastic model. The mechanism of zonal disintegration of rock was analyzed by stress field around underground structures. It shows that the zonal disintegration of rock was related not only to the stress but also to the mechanical parameters of rocks.