考虑非饱和土基质吸力的改进通用条分法

兰州理工大学学报 ›› 2023, Vol. 49 ›› Issue (3): 121-126.

考虑非饱和土基质吸力的改进通用条分法

丑亚玲^*1,2,*, 刘强¹, 朱树顺¹

1.兰州理工大学土木工程学院, 甘肃兰州 730050;
2.兰州理工大学西部土木工程防灾减灾教育部工程研究中心, 甘肃兰州 730050

收稿日期:2020-11-25 出版日期:2023-06-28 发布日期:2023-07-07
通讯作者: 丑亚玲(1976-),女,甘肃合水人,教授,博导. Email:chouyaling@lzb.ac.cn
基金资助:
甘肃省基础研究创新群体(20JR5RA478)

Improved general limit equilibrium when considering the suction of unsaturated soil matrix

CHOU Ya-ling^1,2, LIU Qiang¹, ZHU Shu-shun¹

1. School of Civil Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;
2. Western Civil Engineering Disaster Prevention and Mitigation Engineering Research Center of Ministry of Education, Lanzhou Univ. of Tech., Lanzhou 730050, China

Received:2020-11-25 Online:2023-06-28 Published:2023-07-07

摘要/Abstract

摘要： 极限平衡条分法是目前在边坡稳定性分析中应用广泛的一种方法,而其中通用条分法(GLE法)理论最完善、条件最宽松.非饱和土的抗剪强度和土压力受基质吸力的影响变化很大,因此在应用GLE法时,基质吸力的作用不可忽视. 基于此,对GLE法做了如下改进:① 土体的抗剪强度采用扩展后的Mohr-Comlonb强度准则;② 土条条间力函数采用类似于土体强度准则的一个常数关系. 通过算例分析可知,改进后的GLE法所求得的安全系数大于改进之前的,说明GLE法低估了土坡的抗滑力,进一步说明基质吸力对边坡稳定性的显著影响.

关键词: 通用条分法(GLE法), 基质吸力, 条间力函数, 安全系数

Abstract: The limit equilibrium strip method is currently a method widely used in slope stability analysis, and the General Limit Equilibrium (GLE method) has the most complete theory and the most relaxed conditions. The shear strength and earth pressure of unsaturated soils are greatly affected by the matrix suction. Therefore, when applying the GLE method, the role of matrix suction cannot be ignored. Based on this, the article makes the following improvements to the GLE method: ① the shear strength of the soil adopts the extended Mohr-Comlonb strength criterion; ② the inter-strip force function adopts a constant relationship similar to the strength criterion of the soil. Through the analysis of the calculation example, it can be known that the safety factor obtained by the improved GLE method is greater than that before the improvement. Therefore, the GLE method underestimates the anti-sliding force of the slope, which further illustrates the influence of matrix suction on slope stability is great.

Key words: the General Limit Equilibrium (GLE method), the matrix suction, the inter-strip force function, the safety factor

中图分类号:

P642.22

丑亚玲, 刘强, 朱树顺. 考虑非饱和土基质吸力的改进通用条分法[J]. 兰州理工大学学报, 2023, 49(3): 121-126.

CHOU Ya-ling, LIU Qiang, ZHU Shu-shun. Improved general limit equilibrium when considering the suction of unsaturated soil matrix[J]. Journal of Lanzhou University of Technology, 2023, 49(3): 121-126.

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