论文部分内容阅读
岩石边坡因其结构面数量众多、块体系统及其滑动方式复杂,给危险块体组合的搜索及其安全系数计算带来很大困难。基于块体单元法,对岩石边坡中的危险块体组合搜索及其安全系数的计算方法进行了研究。首先,在块体元强度折减计算的成果下,根据屈服面贯通理论提出搜索危险块体组合的新方法;然后,对安全系数计算方法进行研究,建议在位移突变判据下采用双线性交叉法计算安全系数;最后,进行了单面、双面和多面滑动以及复杂块体系统的算例分析,并与刚体极限平衡法计算结果进行了对比。结果表明,由于块体单元法考虑了力与力矩的平衡及结构面上应力的非均匀分布,其计算结果更准确。该方法有望广泛应用于复杂岩石边坡稳定分析。
Due to the large number of structural planes and the complex system of rock mass and its sliding mode, the rock slope brings great difficulties to the search of dangerous block combination and the calculation of its safety factor. Based on the block element method, the dangerous block combination search in rock slope and the calculation method of its safety factor are studied. Firstly, a new method of searching dangerous block combination is proposed based on yield surface penetration theory based on the result of strength reduction calculation of block element. Then, the calculation method of safety factor is studied. It is suggested that bilinear Cross method is used to calculate the safety factor. Finally, the single-sided, double-sided and multi-plane sliding and complex block systems are analyzed and compared with the rigid body limit equilibrium method. The results show that the calculation results are more accurate due to the consideration of the balance between force and moment and the non-uniform stress distribution on the structural plane. The method is expected to be widely applied to the stability analysis of complex rock slopes.