[1]孙国栋,董旭光,田文通,等.框架锚杆支护多年冻土边坡的稳定性计算方法[J].防灾减灾工程学报,2019,39(01):124-131.[doi:10.13409/j.cnki.jdpme.2019.01.017]
 SUN Guodong,DONG Xuguang,TIAN Wentong,et al.Stability Calculation Method of Permafrost Slopes Supported by Frame Structures with Anchors[J].Journal of Disaster Prevention and Mitigation Engineering,2019,39(01):124-131.[doi:10.13409/j.cnki.jdpme.2019.01.017]
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框架锚杆支护多年冻土边坡的稳定性计算方法()
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防灾减灾工程学报[ISSN:1672-2132/CN:32-1695/P]

卷:
39卷
期数:
2019年01期
页码:
124-131
栏目:
论文
出版日期:
2019-02-28

文章信息/Info

Title:
Stability Calculation Method of Permafrost Slopes Supported by Frame Structures with Anchors
文章编号:
1672-2132(2019)01-0124-08
作者:
孙国栋12 董旭光13 田文通14 颉永斌1
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.天津大学水利安全与仿真国家重点实验室, 天津 300072; 3.宁夏大学土木与水利工程学院,宁夏 银川 750021; 4.中国地震局兰州地震研究所, 甘肃 兰州 730000
Author(s):
SUN Guodong12 DONG Xuguang13 TIAN Wentong14 XIE Yongbin1
1.Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China; 2.State Key Laboratory of Hydraulic Engineering Simulationand Safety, Tianjin University, Tianjin 300072, China; 3.College of Civil andHydraulic Engineering, Ningxia University, Yinchuan 750021, China; 4.Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China
关键词:
多年冻土边坡 框架锚杆 冻融循环 渗流作用 气温 稳定性
Keywords:
permafrost slopes frame structure with anchor freeze-thaw cycles seepage action air temperature stability
分类号:
TU443
DOI:
10.13409/j.cnki.jdpme.2019.01.017
文献标志码:
A
摘要:
为了给出更符合工程实际的冻土边坡稳定性计算方法,通过考察青藏高原地区多年冻土边坡滑移实例、分析其破坏类型和影响因素,提出了高陡边坡的冻融折线型滑移面,基于热平衡理论和莫尔-库伦强度理论给出了折线型的滑移面确定方法; 考虑土体在冻融循环作用下抗剪强度损伤、滑移面上水的渗流作用以及气温变暖三种因素,给出了框架锚杆支护多年冻土区高陡边坡的稳定性计算方法。算例分析表明:利用直线型滑面计算的多年冻土边坡稳定性系数比折线型滑移面更小,容易造成保守设计,使用折线型滑移面更为经济; 边坡开挖后10 a内,冻融循环作用对稳定性的发展趋势起主导作用,10 a后气温变暖发挥主要作用,渗流作用对边坡稳定性的影响较为显著,对稳定性发展趋势没有影响,但三种因素都应当在工程设计中考虑。
Abstract:
In order to develop a more practical calculation method of permafrost slope stability, the freeze-thaw fold line slip plane is raised by investigating the permafrost slope sliding examples and analyzing the failure types and its influence factors.The method of fold line slip plane is determined, based on the thermal equilibrium theory and Mohr-Coulomb strength theory.Considering the damage of shear strength under freeze-thaw cycles, seepage on the frozen sliding surface and temperature variation, the stability calculation method of the permafrost slopes supported by frame structures with anchors is given.The results show that the stability coefficient of the permafrost slope calculated by the linear slip surface is smaller than that of the fold line slip plane, which tends to be conservative, and the fold line slip plane is more economical for design.Under the action of freeze-thaw cycle, the stability of the new slope decreases rapidly and will not remain unchanged until 10 years later.Within 10 years after excavation, freeze-thaw cycles play a dominant role in the evolution of slope stability.Temperature increase plays a major role after 10 years.Seepage action has a significant effect on slope stability, but has no effect on the development trend of slope stability.However, all three factors should be considered in engineering design.

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备注/Memo

备注/Memo:
收稿日期:2017-09-30; 修回日期:2018-01-15 基金项目:国家自然科学基金项目(51808302)、宁夏自然科学基金项目(2018AAC03016)资助 作者简介:孙国栋(1992-),男,博士研究生。主要从事边坡工程防灾减灾方面的研究。Email:sungd992@163.com
更新日期/Last Update: 2019-02-20