土石混合边坡块石随机生成方法与稳定性分析

发布时间：2018-08-11 15:41

【摘要】：针对传统边坡稳定性分析方法未考虑土石混合体边坡内部块石的不足,采用MATLAB编制相应程序生成一定级配随机块石数据,再通过AutoCAD将数据文件转化为图形交互文件,导入Midas建立对应的块石边坡网格模型.最后,通过Midas_to_Flac3d接口程序,生成Flac3d模型,用Flac3d内嵌的有限差分强度折减法对块石边坡进行稳定性分析,并探讨土石界面强度等关键参数对土石混合边坡稳定性的影响.计算结果表明,忽略块石的存在将会给边坡稳定性计算结果引起较大的差异,坡体内塑性区并不像均质土坡那样为规则的类圆弧形态,而是在多种塑性区扩展路径的综合作用下呈现出多滑动带现象,滑动带在贯通过程中有明显的绕石效应,滑动带长度较等效均质土坡有明显延长;在所选定接触面参数变化范围内,接触面刚度参数(法向刚度、切向刚度)对边坡安全系数影响较小,而接触面强度参数(摩擦角、粘聚力)对边坡安全系数影响显著.
[Abstract]:The traditional method of slope stability analysis does not take into account the shortage of rock block inside the soil and rock mixed slope. The corresponding program of MATLAB is used to generate certain gradation random block rock data, and then the data file is transformed into a graphic interactive file through AutoCAD. The corresponding grid model of rock slope is established by introducing Midas. Finally, through Midas_to_Flac3d interface program, the Flac3d model is generated, and the stability analysis of block rock slope is carried out by using the finite difference strength reduction method embedded in Flac3d, and the influence of key parameters such as soil-rock interface strength on the stability of soil-rock mixed slope is discussed. The calculation results show that ignoring the existence of massive rock will cause great difference in the calculation results of slope stability, and the plastic zone in the slope is not the regular circular arc like the homogeneous soil slope. However, under the comprehensive action of various extension paths of plastic zones, there is a phenomenon of multiple slip zones. The slip zone has obvious rock wrapping effect in the process of transfixion, and the length of the slip zone is obviously longer than that of the equivalent homogeneous soil slope. In the range of selected contact surface parameters, the influence of contact surface stiffness parameters (normal stiffness, tangential stiffness) on slope safety factor is small, while contact surface strength parameters (friction angle, cohesion force) have significant influence on slope safety factor.
【作者单位】：中南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51208522) 贵州省交通运输厅科技项目(2012122033,2014122006)~~
【分类号】：U416.14

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