无限块体稳定性研究
A STUDY ON THE INFINITE BLOCK STABILITY
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摘要: 以西南某巨型水电站地下洞室围岩稳定性研究为例,研究了地下洞室围岩无限块体稳定性问题,认为无限块体稳定性是地下工程围岩稳定性研究的一项重要内容。块体可分为无限块体和有限块体两大类,无限块体目前均认为是稳定的。研究表明并不是所有的无限块体都是稳定的,无限块体在某些因素(如自重作用、二次应力作用、地震作用)的影响下仍可失稳破坏,是地下工程围岩的一种新的破坏形式,并提出了无限块体失稳边界条件的概念。提出了无限块体的研究方法,进一步阐明了块体研究的发展方向。Abstract: The infinite block stability of rock mass surrounding a large underground excavation is studied in this paper through an actual case of a large powerstation in southwest. The study indicates that infinite block stabili-ty is very important for the stability of rock mass surrounding underground excavation. Blocks can be classified into infinite block and, finite block. Infinity block is regarded as stability at present. However, infinite block may lose its stability under some conditions and its instability may be a new failure form of rock mass surround- ing underground excavation. Furthermore the boundary condition of infinite block instability is defined. Finally,the method to study infinite block is proposed and study trend of block stability is discussed.