求解三维均质边坡安全系数的稳定性图表法研究

孙超伟; 柴军瑞; 许增光; 覃源; 李刚

doi:10.11779/CJGE201811013

求解三维均质边坡安全系数的稳定性图表法研究 English Version

1. 西京学院陕西省混凝土结构安全与耐久性重点实验室,陕西西安710123;
2. 西安理工大学西北旱区生态水利工程国家重点实验室,陕西西安710048

基金项目: 陕西省基础研究计划-重点项目（2017JK013）; 国家自然科学基金项目（51679197）; 西京学院特区人才科研启动专项基金项目（XJ18T05）

详细信息

作者简介:
孙超伟(1989- ),男,博士,讲师,主要从事水利、岩土工程边坡安全稳定性分析研究。E-mail：chao_wei_106@126.com。

中图分类号: TU43
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出版历程
- 收稿日期: 2017-09-28
- 发布日期: 2018-11-24

Stability charts for determining safety factors of 3D homogeneous slopes

1. Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi'an 710123, China;
2. State Key Laboratory Base of Eco-hydraulics in Northwest Arid Area, Xi'an University of Technology, Xi'an 710048, China

摘要

摘要: 边坡稳定性图表为初步评价边坡的稳定性提供了一种简单但却行之有效的途径。针对现有三维稳定性图表主要是基于极限平衡法和极限分析法提出的不足,采用基于场变量的有限元强度折减法,建立了一套求解三维均质边坡安全系数的稳定性图表。借助ABAQUS软件的二次开发平台UFIELD程序,设置岩土体黏聚力与内摩擦角为场变量的函数,场变量为增量步时间t的函数,从而通过控制增量步时间t实现黏聚力与内摩擦角的折减,通过一次计算即可求得边坡的安全系数,无需手工修改折减系数反复试算。结合3个典型算例对该方法的可靠性进行了验证,并进行了计算效率的比较。结果表明,该方法得到的安全系数可靠,且提高的计算效率。另外,将基于该方法提出的三维均质边坡稳定性图表用于快速获取边坡安全系数、设计边坡坡度和反演滑带土体的强度参数,是合理可行的。
- 岩土工程 /
- 三维边坡 /
- 安全系数 /
- 强度折减 /
- 场变量 /
- 稳定性图表
Abstract: Stability charts provide a simple and effective way to evaluate the preliminary slope stability analysis. Using the strength reduction FEM based on field variable, a series of stability charts are proposed to determine factors of safety for 3D homogeneous slopes. With the second development platform UFIELD program of ABAQUS, the cohesions and internal friction angles of rock and soil mass are assigned as functions of field variables. The field variables are assigned as a function of step time t, the cohesions and internal friction angles can be reduced with the increase of t, and the safety factor of slopes can be obtained in a single simulation process, which avoids modifying of the input files and without repeating the trial calculation. Based on three typical slope examples, the reliability of this method is validated. The computational efficiency is compared through analysis. The results show that the safety factor obtained by this method is effective and reliable. The computational efficiency is improved. In addition, the proposed stability charts for 3D homogeneous slopes based on the proposed method are feasible and reliable to rapidly obtain the safety factors, designed slope angles and strength indexes for soils of sliding zone.
- geotechnical engineering /
- three-dimensional slope /
- safety factor /
- strength reduction /
- field variable /
- stability chart

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参考文献(24)

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