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块体理论是一种比较常用的岩土工程稳定性分析方法,但缺乏对非贯通结构面的研究,导致搜索出的关键块体不够精准和全面。如何处理非贯通结构面,判断其是否应该连通成为块体理论研究至关重要的一个问题。采用数值模拟的方法计算含两共面结构面岩体试样在不同岩桥倾角、结构面摩擦系数、围压和连通率情况下的贯通强度与峰值强度。引入贯通系数变量,定量描述贯通强度与峰值强度之间的关系。将贯通强度作为判断岩桥贯通与否的一个衡量指标,建立起贯通强度与岩桥倾角、结构面摩擦系数、围压和连通率之间的函数,即含两条共面结构面岩体的岩桥贯通准则。该准则可准确判断含两条共面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桥贯通而滑移的关键块体。
Block theory is a commonly used geotechnical stability analysis method, but the lack of research on non-through structural plane, resulting in the search of the key block is not precise enough and comprehensive. How to deal with non-through structural plane to determine whether it should be connected to become a block theory research is a crucial issue. The numerical simulation method was used to calculate the through-strength and peak strength of rock samples with two coplanar faces under different rock-bridge inclination, friction coefficient, confining pressure and connectivity rate. Through-variable coefficients are introduced to quantitatively describe the relationship between penetration strength and peak strength. Through the strength as a measure to judge whether a rock bridge passes through or not, a function between the penetration strength and rock slope inclination, the friction coefficient, the confining pressure and the connectivity rate of the rock face is established, that is, Rock Bridge through criteria. The criterion can accurately determine whether a rock bridge with two coplanar facets should be connected. The block theory based on the rock-through criterion can accurately search out the key blocks that slide through and pass through the rock bridge.