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传统的块体理论分析方法未考虑到非贯通结构面在施工扰动作用下可能出现连通的问题,导致搜索出的关键块体不够精准和全面。如何判断非贯通结构面是否应该连通成为了块体理论研究的一个重要课题。采用数值模拟方法计算岩体试样的贯通强度与峰值强度,并引入贯通系数变量描述贯通强度与峰值强度的比值变化。将贯通强度作为判断岩桥贯通与否的衡量指标,定量分析贯通强度与岩桥倾角、结构面摩擦系数、围压、连通率和结构面倾角之间的函数关系,即含两条非贯通结构面岩体的岩桥贯通准则。该准则可以准确判断含两条非贯通结构面岩体的岩桥是否应该连通。基于岩桥贯通准则的块体理论能够准确搜索出因岩体内部结构面扩展贯通而滑移的关键块体,使得搜索出的关键块体更加全面,更好的分析工程的稳定性。
The traditional theory of block theory does not take into account the possible connectivity of non-through structural planes under the construction disturbance, resulting in the lack of accurate and comprehensive search of key blocks. How to judge whether the non-through structural plane should be connected has become an important issue in the study of block theory. The numerical simulation method was used to calculate the through-strength and peak-strength of rock samples, and the variation of through-coefficient was introduced to describe the change of the ratio between through-strength and peak strength. Through the strength of the rock bridge as a measure to judge whether or not through to measure the quantitative analysis of the relationship between penetration strength and rock slope inclination, the friction coefficient of the structure surface, confining pressure, connectivity and structural inclination angle between the two non-through structure Rock face through rock pass criteria. The criterion can judge exactly whether the rock bridge with two non-through structural plane rock mass should be connected. The block theory based on rock through criterion can accurately search out the key blocks which are caused by the expansion and penetration of the structural plane of rock mass, making the key blocks searched more comprehensively and analyzing the stability of the project better.