四川巴中市南龛斜坡变形破坏机制分析与稳定性评价

DEFORMATION MECHANISM AND STABILITY EVALUATION OF NANKAN SLOPE

在研究南龛斜坡自然地质环境条件、岩土物理力学参数以及现场勘探测试的基础上 ,采用地质分析、半定量的弹塑性有限元分析、定量的极限平衡法分析、因素敏感性分析以及可靠性分析等方法 ,分析了斜坡的成因机制和稳定性 ,并计算了其破坏概率。作者们认为该斜坡变形破坏的地质力学模式为溜滑 -蠕滑 -拉裂型 ;坡面上雨水入渗是斜坡溜滑、蠕滑、拉裂变形破坏的主导诱发因素。计算结果表明就整体而言 ,斜坡无论在天然和饱水状态都处于基本稳定状态 ,宏观上斜坡还不具备大规模滑动的条件 ;但在饱水状态下 。

This paper was based on the study of the natural environment, the physics and mechanics property of rock and soil, the exploration and monitoring data in field of the slope. Methods of geologic analysis, the semi-quantitative elastic-plastic FEM analysis, quantitative limit equilibrium method and factor sensitivity analysis, and reliability analysis of the slope were adapted. Geologic basic features, genetic mechanism, the stability status and failure probability of the slope were demonstrated. The authors suggest that the geo-mechanics model of the deformation and failure of the slope is sliding-peristaltic-cracking and that rainfall and the rain-water penetrating in slope are the main triggered factors leading to sliding, to peristaltic sliding and to cracking. The calculating result of the slope stability and the analyzing result of credibility degree of the slope stability indicate that as the whole the slope is steady under natural condition or saturated condition. But the studies also show that under the saturated condition, the part of the slope will be not steady or potentially steady, especially the forward steep slope.