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一、前言在地下工程周围的岩体中,通过理论计算或测定求得了它的应力场之后,就需要判断岩体是否会破坏。对脆性岩石来说,这就是所谓“稳定分析”。另一方而,对地下工程周围的延性岩石,在非线性有限单元法计算中,哪些岩体单元已达到塑性状态,从而必须对这些单元进行应力迁移,这些问题都需要有一个正确的岩体强度指标作为依据。从力学的角度,岩体是由结构体(致密的岩块)和结构面(各种节理、裂隙、层理等软弱面)两部分组成。以往在很长的时期中,把结构体强度直接作为岩体的强度,忽视了结构面对岩体强度的影响。对具有结构面的岩体来说,这无疑是错误的。近来,对结构面的强度已经引起重视,这显然是前进了一大步。但是有时又强调得过分,似乎岩体强度只与结构面
I. INTRODUCTION After obtaining the stress field of a rock mass around an underground project through theoretical calculations or measurements, it is necessary to determine whether the rock mass will be destroyed. For brittle rocks, this is called “stability analysis.” On the other hand, for the ductile rock around the underground engineering, in the nonlinear finite element method calculation, which rock units have reached the plastic state, and these units must undergo stress migration. All these problems require a correct rock strength. Indicators as a basis. From a mechanics point of view, the rock mass consists of two parts: a structural body (dense rock mass) and a structural surface (various joints, crevices, bedding, etc.). In the past, for a long period of time, the strength of the structure was directly used as the strength of the rock mass, ignoring the influence of the structure on the strength of the rock mass. For rock masses with structural faces, this is undoubtedly wrong. Recently, attention has been paid to the strength of the structural surface, which is obviously a big step forward. But sometimes it is overemphasized that it seems that the rock body strength is only with the structural plane.