考虑岩土体力学特性自然劣化规律的双折减系数强度折减法研究

发布时间：2018-11-19 08:34

【摘要】：强度折减法为边坡稳定分析提供了较好的思路,在传统的强度折减法中,对边坡岩土体的黏聚力和内摩擦角采用相同的折减系数,但岩土体力学参数在劣化过程中有其自然规律,不一定是同步折减的,也就是说同步折减的思路不一定满足岩土体参数本身的劣化规律。基于此,以黏性土边坡为研究对象,以含水率变化导致其力学参数劣化规律为例,收集整理了大量试验资料,分析得到了含水率变化情况下黏性土的黏聚力和内摩擦角劣化统计规律,并基于此提出了一种考虑岩土体力学参数自然劣化规律的双折减系数强度折减法和综合安全系数计算方法。标准边坡和实例边坡的计算结果表明,所提出的双折减系数强度折减法可以较好地反映边坡的实际安全稳定情况。
[Abstract]:The strength reduction method provides a good idea for the slope stability analysis. In the traditional strength reduction method, the cohesive force and the internal friction angle of the slope rock and soil mass are reduced by the same reduction coefficient. But the physical parameters of rock and soil have their natural laws in the process of deterioration, which is not necessarily synchronous reduction, that is to say, the thinking of synchronous reduction does not necessarily satisfy the deterioration law of the parameters of rock and soil. Based on this, taking the clay slope as the research object and taking the law of deterioration of mechanical parameters caused by the change of water content as an example, a large number of experimental data are collected and sorted out. The statistical rules of cohesive force and internal friction angle deterioration of clay under the condition of water content change are obtained. Based on this, a new strength reduction method and a comprehensive safety factor calculation method are proposed, which take into account the law of natural deterioration of rock and soil physical parameters. The calculation results of standard slope and practical slope show that the proposed double reduction coefficient strength reduction method can better reflect the actual safety and stability of the slope.
【作者单位】：三峡库区地质灾害教育部重点实验室(三峡大学);
【基金】：国家自然科学基金重点项目(51439003);国家自然科学基金资助项目(51679127) 湖北省自然科学基金重点项目(2015CFA140)
【分类号】：TU43;TU45

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