滑塌式危岩的断裂判据研究

Study of Slip-Collapse Unstable Rock Mass′s Fracture Criterion

滑塌式危岩的破坏主要取决于主控结构面的扩展,主控结构面的扩展实质上是一个断裂问题。运用断裂力学理论,把危岩体视为具有单边穿透裂纹的有限平板,建立滑塌式危岩的断裂力学模型。采用等效应力原则,得出主控结构面的非贯通段平均应力场。推导出Hoek-Brown经验方程与断裂强度因子之间的关系,即:滑塌式危岩的断裂判据。

Slip-collapse unstable rock mass damage occurred because of main structural plane′s extending, it′s a fracture mechanics problem essentially. Employing fracture mechanics theory, taking unstable rock block as a finite flat with unilateral crack, fracture analysis model forged. Applying the principle of effective stress, stress field in non-penetrating segment is given. The relationship between Hoek-Brown equation and fracture stress intensity factors also obtained, that′s slip-collapse unstable rock mass′s fracture criterion.