[1]谢伟东.降雨入渗对隧道下穿路基段边坡变形稳定性的影响分析[J].西安建筑科技大学学报(自然科学版),2020,52(04):470-477.[doi:10.15986-j.1006-7930.2020.04.002]
　XIE Weidong.Impact analysis of rainfall infiltration on the deformation mechanism and stability of roadbed slope[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2020,52(04):470-477.[doi:10.15986-j.1006-7930.2020.04.002]
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降雨入渗对隧道下穿路基段边坡变形稳定性的影响分析()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
52
期数:
2020年04期
页码:
470-477
栏目:
出版日期:
2020-08-28

文章信息/Info

Title:
Impact analysis of rainfall infiltration on the deformation mechanism and stability of roadbed slope
文章编号:
1006-7930(2020)04-0470-08
作者:
谢伟东1; 2
(1.中铁建贵州建设有限公司 贵州 贵阳 550029; 2. 西安建筑科技大学 隧道与地下结构工程研究所,陕西 西安,710055)
Author(s):
XIE Weidong1; 2
(1.China Railway Construction Guizhou Construction Co.,Ltd.,Guiyang 550029,China; 2.Institute of Tunnel and Underground Structure Engineering,Xi’an Univ. of Arch.& Tech., Xi’an 710055,China)
关键词:
边坡工程;  隧道下穿施工;  雨水入渗;  流固耦合;  数值模拟
Keywords:
slope engineering;  tunnel underpass construction;  rainwater infiltration;  flow solid coupling;  numerical simulation
分类号:
U455
DOI:
10.15986-j.1006-7930.2020.04.002
文献标志码:
A
摘要:
隧道下穿运营高速公路路基边坡施工扰动造成既有路基边坡的松动和变形,降雨入渗引起的下滑力增加和滑面抗剪强度的降低进一步加剧了边坡的变形,考虑降雨入渗和隧道下穿施工影响的路基边坡稳定性分析及确定合理、可行的加固方案对确保路基边坡的稳定性尤为重要.以贵阳轨道交通1号线下麦西地铁隧道下穿运营高速公路路基边坡工程为背景,考虑雨水入渗条件下隧道施工扰动对边坡稳定的影响,基于路基边坡土体的土 - 水特征曲线特性构建非饱和土体的流固耦合计算模型,分析雨水入渗条件下扰动路堤边坡的位移、塑性区特性和路堤边坡的安全性,分析结果表明降雨入渗对含软弱夹层的路基边坡稳定性影响显著,造成路堤边坡沿该弱面的塑性区贯通; 考虑降雨的影响,经历降雨影响后的边坡安全系数降低,低于原边坡的安全系数,因此对受临近施工扰动的边坡需要考虑不同降雨次数后边坡安全性的累积作用.考虑降雨对扰动路堤边坡的影响,对比分析了锚索和抗滑桩加固措施对边坡滑移的控制效果,建议并实施了路堤边坡的施工,取得了良好效果.
Abstract:
Rainfall has important influence on slope stability, it has been a hot and difficult topic to study the mechanical knowledge of unsaturated soil for simulating the deformation of unsaturated soil roadbed slope under the condition of rainfall infiltration. This paper adopted the unsaturated soil fluid-solid coupling calculation model which considering hydraulic permeability coefficient and soil-water characteristic curve for the numerical analysis about the seepage field and stress field coupling of unsaturated roadbed slope under the condition of rainfall infiltration to calculate the stability about the interaction between roadbed slope and tunnel. The results show that rainfall infiltration has a significant influence on the stability of roadbed slope with weak interlayer, meanwhile the slope safety factor and potential sliding surface position are different under the condition of same rainfall intensity with different rainfall duration, which is based on the project of Guiyang No.1 rail transit line underpass the roadbed slope of existing expressway. At the same time, this paper also discusses the control effects of different reinforcement measures to reduce the slope slippage, and it is concluded that the anchorage cable reinforcement can effectively reduce the slope slippage.

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备注/Memo

备注/Memo:
收稿日期:2019-12-27 修改稿日期:2020-07-22
基金项目:陕西省创新能力支撑计划 - 创新团队基金资助项目(2020TD-005); 陕西省住房城乡建设科技计划基金资助项目(2019-K39)
第一作者:谢伟东(1972-),男,教授级高级工程师,主要从事施工建设管理工作.E-mail:946867789@qq.com
更新日期/Last Update: 2020-09-25