基于结构面特征的合掌岩石窟稳定性分析评价

Stability Analysis and Evaluation of Hezhangyan Grottoes Based on the Feature of the Structural Plane

合掌岩石窟属于浅埋洞室,其开挖和雕刻过程中的失稳情况主要是洞壁局部块体掉落。为分析评价洞壁的块体稳定性,进行了工程地质调查、工程钻探、声波测试、以及室内试验等工作,得到结构面的产状以及岩体的物理力学性质。采用BQ法对围岩等级进行划分,并采用基于结构面特征的赤平投影对洞室稳定性进行定性评价,运用块体理论进行定量评价。计算结果表明,洞壁及洞顶块体不稳定需进行加固。

Hezhangyan grottoes is a shallow buried cave. During its excavation and carving process,it appears some instability situation which is mainly the fallen of local blocks. In order to analyze and evaluate the block stability of the cave wall. Several works has been done including engineering geological survey,engineering drilling,acoustic test and laboratory test. The physical and mechanical properties of the rock mass and the orientation of structure plane are obtained. BQ method is adopted to classify the surrounding rock. Stereographic projection,which based on the feature of structural plane is adopted in qualitative analysis on the stability of the cave. Quantitative analysis on the stability of the cave is done by using block theory. The calculation results show that the cave wall and the roof block are unstable which need to be reinforced.