块石形状对土石混合边坡稳定性的影响分析  

Analysis of the effect of rock block shapes on the stability of soil-rock slopes

作　　者：刘顺青[1,2] 蔡国军 姜朋明[1] 周爱兆[1] 孙可[1] LIU Shunqing;CAI Guojun;JIANG Pengming;ZHOU Aizhao;SUN Ke(School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212100, China;Institute of Geotechnical Engineering, Southeast University, Nanjing 211189, China)

机构地区：[1]江苏科技大学土木工程与建筑学院,镇江212100 [2]东南大学岩土工程研究所,南京211189

出　　处：《江苏科技大学学报（自然科学版）》2021年第3期95-102,共8页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金资助项目(57979128)。

摘　　要：为分析块石形状对土石混合边坡稳定性的影响,基于随机块石生成系统,随机生成了块石形状为圆形、六边形、四边形及三角形,含石率从10%~60%的边坡模型,不同块石形状下每种含石率均考虑8个不同的块石分布位置,最后将生成的模型导入极限分析程序中建立数值分析模型,采用有限元极限分析法对该类型边坡的稳定性进行了分析.研究表明,块石形状及含石率相同时,土石混合边坡的最大、最小下、上限安全系数的差值与块石空间分布位置关系较大;相同含石率下土石混合边坡下、上限安全系数平均值的大小关系依次为三角形、四边形、六边形及圆形,但是块石形状效应的影响程度与含石率密切相关;4种块石形状下土石混合边坡的剪切带均呈现出“绕石”、“分流”及“包含”模式.研究结果为土石混合边坡的设计及施工提供参考依据.In order to analyze the stability of soil-rock slopes considering the effects of rock block shapes,the slope model is randomly generated with the rock block proportion varying from 10%to 60%based on random rock block generation system.The shapes of the rock block are circle,hexagon,quadrilateral and triangle.Each rock block proportion model takes into account eight different rock block distribution locations for different rock block shapes.Finally,the generated model is imported into limit analysis program to establish the model of soil-rock slopes.The stability of soil-rock slopes are analyzed by finite element limit analysis method.The results show that the maximum,minimum lower and upper limit safety factors of soil-rock slopes with the same rock block shape and proportion vary greatly due to the difference of the spatial distribution of rock blocks.The order of the average values of the lower and upper limit safety factor of soil-rock slopes is triangle,quadrilateral,hexagon and circle.However,the degree of influence of rock block shape is closely related to rock block proportion.The shear zone in the four soil-rock slopes shows three typical expansion modes in the case of four kinds of rock blocks.They are"around stone","distributary"and"inclusion".The research results can provide reference for the design and construction of soil-rock dual structure slopes.

关 键 词：土石混合边坡 块石形状 极限分析 含石率 稳定性 

分 类 号：TU43[建筑科学—岩土工程]