Stability Analysis and Reliability Evaluation in Cataclastic Loose Rock Mass Blocks
Stability Analysis and Reliability Evaluation in Cataclastic Loose Rock Mass Blocks
复制标题
DOI：
10.1155/2021/5314937
复制
发表时间：
2021-01-04
影响因子：
1.8
通讯作者：
Zhang, Jianpeng
中科院分区：
文献类型：
--
作者：
Zhang, Liguo;Wang, Dong;Zhang, Jianpeng
碎裂岩体具有多种破坏模式和破坏机制，是岩质边坡建设中的关键地质问题。西藏澜沧江某水电站边坡广泛分布有碎裂岩体。基于关键块体理论，将边坡潜在不稳定块体划分为关键块体和次关键块体，并引入系统可靠度评价理论。建立了定量分析碎裂岩质边坡滑动破坏岩体稳定性的方法。在此基础上，采用传统地质测量和三维激光扫描相结合的方法，确定了某水电站几个岩质边坡的碎裂岩体和结构面的空间分布。最后，结合BATE 2.0软件和矢量赤平投影，将所提出的方法应用于研究区。结果表明，研究边坡的主要破坏模式为楔体破坏，系统可靠度为1.69。随着关键块体失稳概率的增加，系统块体失稳概率的增加是明显的，这反映了关键块体对系统块体稳定性的控制作用。计算出的系统失稳概率略大于关键块失稳概率。
Cataclastic rock masses with multiple failure modes and mechanisms are critical geological problems in the construction of rock slopes. Cataclastic rock masses are widely distributed in slopes of a hydropower project located on Lancang River, which is located in Tibet, China. In this study, the potentially unstable block of the slope is divided into key block and secondary key block based on the key block theory, and the system reliability evaluation theory is introduced. The method for quantitatively analyzing the rock mass stability of cataclastic slopes with sliding failure is established. Then, the spatial distribution of cataclastic rock masses and discontinuities in several rock slopes of a hydropower project are determined using traditional geological surveying and 3D laser scanning. At last, combining the BATE 2.0 software and the stereographic projection of the vector, the proposed method is applied to the study area. The results show that the main failure mode of the studied slope is wedge failure, and the system reliability is 1.69. With the increase in the instability probability of the key block, the increase in the instability probability of the system block is obvious, which reflects the controlling effect of the key block on the stability of the system block. The calculated system instability probability is slightly larger than the key block instability probability.