土体参数变异性对框架锚杆加固黄土边坡可靠度影响分析

兰州理工大学学报 ›› 2021, Vol. 47 ›› Issue (2): 127-131.

土体参数变异性对框架锚杆加固黄土边坡可靠度影响分析

李忠^1,2, 丁盛环^1,2, 叶帅华^*1,2

1.兰州理工大学甘肃省土木工程防灾减灾重点实验室, 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:2019-01-20 出版日期:2021-04-28 发布日期:2021-05-11
通讯作者: 叶帅华(1983-),男,河南巩义人,博士,教授.Email:yeshuaihua@163.com
基金资助:
国家自然科学基金(51508256),甘肃省建设科技攻关计划项目(JK2015-5),兰州市科技发展计划项目(2015-3-131)

Effect of soil parameter uncertainty of loess slope reinforced by frame anchor on reliability

LI Zhong^1,2, DING Sheng-huan^1,2, YE Shuai-hua^1,2

1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou Univ. of Tech., Lanzhou 730050, China;
2. Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou Univ. of Tech., Lanzhou 730050, China

Received:2019-01-20 Online:2021-04-28 Published:2021-05-11

摘要/Abstract

摘要： 为了研究框架锚杆加固黄土边坡土体参数(黏聚力c、内摩擦角φ、重度γ)变异性对边坡可靠指标的影响,以极限平衡理论为基础,依托边坡工程实例,利用GeoStudio 2012有限元软件,建立加固边坡计算模型,结合Monte Carlo试验模拟完成以上分析过程.结果表明:当固定其中两个土体参数的变异系数,改变另一个参数的变异系数时,φ的变异系数对边坡可靠指标的影响最大,γ的变异系数对边坡可靠指标的影响最小;当固定其中一个参数的变异系数,使另外两个参数的变异系数同时变化时,内摩擦角φ和重度γ的变异系数同时变化时,对边坡可靠指标的影响最大,黏聚力c和重度γ的变异系数同时变化时对边坡可靠指标的影响最小.

关键词: 框架锚杆, 黄土边坡, 变异系数, 可靠指标

Abstract: In order to study the effect of soil parameters such as cohesion force (c), internal friction angle (φ) and density of the soil (γ) on the reliability index of loess slope strengthened by frame anchors, based on the limit equilibrium theory, relying on the slope engineering example, using GeoStudio 2012 finite element software, the calculation model of reinforced slope is established, and the above analysis process is completed by Monte Carlo test simulation. The results show that when the coefficient of variation of two parameters is fixed and the coefficient of variation of the other parameter is changed, the coefficient of variation of φ has the greatest influence on the reliability index of the slope, and the coefficient of variation of γ has the least influence on the reliability index of the slope. When fixing the coefficient of variation of one of the parameters and the coefficient of variation of the other two parameters change simultaneously, the coefficient of variation of the internal friction angle φ and the density of the soil γ simultaneously has the greatest influence on the reliability index of the slope. The coefficient of cohesion force c and density of the soil γ have the least influence on the reliability index of the slope.

Key words: frame anchor, loess slope, coefficient of variation, reliability index

中图分类号:

TU431

李忠, 丁盛环, 叶帅华. 土体参数变异性对框架锚杆加固黄土边坡可靠度影响分析[J]. 兰州理工大学学报, 2021, 47(2): 127-131.

LI Zhong, DING Sheng-huan, YE Shuai-hua. Effect of soil parameter uncertainty of loess slope reinforced by frame anchor on reliability[J]. Journal of Lanzhou University of Technology, 2021, 47(2): 127-131.

参考文献

[1] 周勇,王旭日,朱彦鹏,等.泥岩砂岩互层高边坡监测与数值模拟对比分析[J].兰州理工大学学报,2018,44(1):109-115.
[2] 王邓峮,叶帅华,朱彦鹏.考虑预应力作用的土钉复合锚杆支护结构的稳定性分析[J].兰州理工大学学报,2015,41(1):122-127.
[3] 朱彦鹏,谷玉朝,李忠.框架预应力锚杆支护黄土边坡土压力分布模型试验[J].兰州理工大学学报,2008,34(3):108-112.
[4] 陈立宏,陈祖煜,刘金梅.土体抗剪强度指标的概率分布类型研究[J].岩土力学,2005,26(1):37-40.
[5] 牛草原,王乐华,许晓亮.土体抗剪强度参数统计特性对边坡可靠性影响研究[J].水利水电技术,2017,48(12):195-198.
[6] 张文生,罗强,蒋良潍,等.基于可靠指标的土体强度参数变异特征及类型划分[J].岩石力学与工程学报,2017,36(增刊2):4188-4204.
[7] 李典庆,蒋水华,周创兵,等.考虑参数空间变异性的边坡可靠度分析非侵入式随机有限元法[J].岩土工程学报,2013,35(8):1413-1422.
[8] 桂勇,罗嗣海,邓通发.强度参数统计特性对边坡稳定可靠性的影响[J].土木建筑与环境工程,2015,37(4):67-76.
[9] 韩宪军,张小强,张红艳.基于Monte-Carlo法的边坡可靠性分析[J].河南城建学院学报,2014,23(6):9-12.
[10] 贡金鑫.工程结构可靠度计算方法[M].大连:大连理工大学出版社,2003.
[11] 王维娜,葛文渊.基于GeoStudio软件的边坡稳定性影响因素分析[J].中国公路,2017,42(18):116-117.
[12] 王召磊,杨志银,张俊.基于GeoStudio的预应力锚索复合土钉墙稳定性分析[J].工业建筑,2011,41(增刊1):437-440.
[13] 李萍,黄丽娟,李振江,等.甘肃黄土高边坡可靠度研究[J].岩土力学,2013,34(3):811-817.
[14] 苏倩.架预应力锚杆柔性支护结构的可靠度分析[D].兰州:兰州理工大学,2013.