湖南岐山仁瑞寺节理边坡稳定性的细观损伤力学分析方法

 对湖南仁瑞寺岩质边坡进行地质勘查，该边坡结构面主要为X节理，一组走向为170°～265°，另一组走向为105°～125°，倾角较陡，普遍为50°～90°。通过6组实验分别确定岩块与结构面的力学参数。基于细观损伤力学理论，认为节理岩体是由岩块与微裂纹构成的各向异性材料，并利用代表性体积单元建立微裂纹的滑裂准则。通过编制相应的软件建立坡角为60°、节理倾角为52.5°和90.0°的岩质边坡计算模型，并对该边坡的稳定性进行分析。采用逐步去除约束的方式进行开挖模拟，得到边坡的塑性贯通区。通过与实际滑坡形式进行对比，模拟效果好，证明微裂纹是控制岩质边坡破坏的主要因素，对理解节理边坡的破坏机制具有重要意义。同时，该方法对于预测节理边坡破坏面的形状与位置以及复杂边坡的稳定性分析都有一定的借鉴意义。

MESO-DAMAGE MECHANICAL ANALYTICAL METHOD FOR JOINTED SLOPE STABILITY OF HUNAN QISHAN RENRUI TEMPLE

Geological investigation has been carried out for the rock slopes of Hunan Renrui temple. The slope structural planes are mainly with X joints,and one group trend is 170°-265° and the other group is 105°-125°. Both the joints are with steep dip angle,and are general in the interval of 50°-90°. Mechanical parameters of rock block and joint plane are determined by six groups of tests. According to meso-damage mechanical theory,jointed rock is anisotropic material composed of rock blocks and microcracks;and the slip crack criterion of the microcracks is established by representative volume element(RVE). Stability analysis is conducted on rock slope based on the established calculation model with a slope angle of 60° and two joint inclinations of 52.5° and 90.0° by corresponding software. The plastic penetration area of rock slope is obtained by using gradual constraint removal to conduct excavation simulation. Compared with the actual landslide,the simulation result is good,which proves that the microcrack is the primary factor to control the rock slope failure;and it is very valuable for understanding the failure mechanism of the jointed slope. Simultaneously,this method can provide references to the forecast of the shape and position of jointed slope failure plane and stability analysis of complex slopes.