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工程科学与技术:2019,51(4):105-115
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不同含石率及基覆岩层倾角下土石混合体边坡稳定性分析
(1.江苏科技大学 土木工程与建筑学院, 江苏 镇江 212005;2.东南大学 岩土工程研究所, 江苏 南京 211189)
Stability Analysis of the Soil-rock-mixture Slopes Under Different Rock Block Proportions and Dip Angles of Bedrock
(1.School of Architecture and Civil Eng., Jiangsu Univ. of Sci. and Technol., Zhenjiang 212005, China;2.Inst. of Geotechnical Eng., Southeast Univ., Nanjing 211189, China)
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投稿时间:2018-10-29    修订日期:2019-02-14
中文摘要: 为准确地分析土石混合体边坡的稳定性,提出了一种可考虑不同块石含量、块石随机分布及基覆岩层倾角的边坡稳定性分析方法。该方法根据土石混合体边坡中的块石含量、级配以及基覆岩层倾角,随机生成了含石率从10%~60%、基覆岩层倾角从0°~20°的边坡模型,每种含石率及基覆岩层倾角均考虑8个不同的块石分布位置,最后将生成的模型导入到Optum G2中建立土石混合体边坡模型,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,并将计算结果与采用Kalender等效强度参数模型所得的结果进行了对比验证。研究结果表明,由于块石空间分布位置的不同,相同含石率及基覆岩层倾角下土石混合体边坡的最大、最小下、上限安全系数变化较大;相同含石率下,随着基覆岩层倾角的增加,边坡的下、上限安全系数的平均值变化相对较小;土石混合体边坡坡体中的剪切带呈现出“绕石”、“分流”以及“包含”这3种典型的扩展模式;通过将本文方法与Kalender等效强度参数模型所得的安全系数进行的对比分析,验证了作者所提方法的可行性。研究结果可为土石混合体边坡的设计及施工提供参考依据。
Abstract:In order to accurately analyze the stability of soil-rock-mixture slopes, a method which considers the random distribution, proportion of rock blocks, and the dip angles of bedrock is put forward. Based on the rock block proportion and gradation of soil-rock-mixture slope, the slope model is randomly generated under the rock block proportion from 10% to 60%. The slope model is also randomly generated under the dip angle of bedrock from 0° to 20°. Each rock block proportion and dip angle of bedrock model takes into account eight different rock distribution locations. Finally, the generated model is imported into Optum G2 to establish the model of soil-rock- mixture slopes. The stability of soil-rock-mixture slopes are analyzed by finite element limit analysis method, and the calculated results are compared with those obtained by equivalent strength parameter model of Kalender. The results show that the maximum and minimum lower and upper limit safety factors of soil-rock-mixture slopes with the same rock block proportion and dip angle of bedrock vary greatly due to the difference of the spatial distribution of rock blocks. The shear zone in the soil-rock-mixture slopes is no longer circular, but shows three typical expansion modes. They are "around stone", "distributary" and "inclusion". The safety factors of soil-rock-mixture slopes obtained by equivalent strength parameter model of Kalender and random rock block model are quite different. The results show that the safety factor obtained by the method of random rock block model is feasible. The research results can provide reference for the design and construction of soil-rock-mixture slopes.
文章编号:201801209     中图分类号:TU43    文献标志码:
基金项目:江苏省高等学校自然科学研究项目(17KJB560003);国家自然科学基金项目(51579119);镇江市重点研发计划(社会发展)项目(SH2018024)
作者简介:刘顺青(1985-),男,讲师,博士.研究方向:边坡稳定性及数值分析.E-mail:sqljust@just.edu.cn
引用文本:
刘顺青,蔡国军,周爱兆,姜朋明.不同含石率及基覆岩层倾角下土石混合体边坡稳定性分析[J].工程科学与技术,2019,51(4):105-115.
LIU Shunqing,CAI Guojun,ZHOU Aizhao,JIANG Pengming.Stability Analysis of the Soil-rock-mixture Slopes Under Different Rock Block Proportions and Dip Angles of Bedrock[J].Advanced Engineering Sciences,2019,51(4):105-115.