72
D0I;10. 7672/sgjs2015240072
工技
术
施
CONSTRUCTION TECHNOLOGY
2015年12月下第44卷
罐忆巢
膨胀土边坡入渗稳定性分析与锚杆支护参数研究
横1.2
侯定贵1.2，史冀波3，肖莉莉1,2，焦艳平1,2，崔
（）80001（）1）
学与地下工程国家重点实验室，北京
100083；3.宁波市交通工程质量安全监督站，浙江宁波
315000)
[摘要］裂隙的存在是膨胀土边坡在降雨条件下极易失稳的重要因素。为探索膨胀土边坡在降南条件下渗流场变化特点与稳定性，进行了0，2m与4m裂隙深度下的边坡饱和-非饱和渗流有限元数值模拟，在渗流分析基础上进行基于极限平衡法的膨胀土边坡稳定性分析与锚杆支护参数研究。分析结果表明，裂隙的存在及发展对膨胀土边坡降雨人渗与孔腺水压力分布有显著影响；裂隙开裂越深，表层边坡体越易形成暂态饱和区，同时边坡越趋于不稳定；裂隙发育膨胀土边坡滑坡滑面具有浅层性等特点，锚杆长度、错固角度、锚固位置等参数变化对降雨下影胀土边坡安全系数的影响与一般土质边坡有所区别；在分析基础上，提出了合理的错杆布置方式，以期对膨胀土边坡锚杆布置设计提供建议和参考。
【关键词】边坡；裂隙；膨胀土；渗流；稳定性
【中图分类号】U213.1
［文献标识码】A
【文章编号】1002-8498（2015)24-0072-04
ResearchonStabilityandAnchorSupportParametersof ExpansiveSoilSlopeUndertheConditionofSeepage Hou Dingguil-2,Shi Jibo",Xiao Lii-,JiaoYanping-?,Cui Nan'-2
(1. School of Mechanic and Civil Engineering, China Unisersity of Mining and Technology,Bejing 100083, China; 2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Beijing, Bejing100083, China; 3. Ningbo City Traffic Engineering Quality Supervision Station,
Ningbe, Zhejiang 315000,China)
Abstract:Fissure is an important factor of expansive soil slope instability under rainfall. In order to explore the seepage field characteristics and stability of expansive soil slope under the condition of rainfall, slope saturated and unsaturated simulation is done under O, 2, 4m fissure depth, and the expansive soil slope stability and the bolt support parameters analysis based on limit equilibrium method is carried out. Analysis results show that: the existence and development of fissures of expansive soil slope essarooainssaeoeoeeeras e slope body, the more easy to form a transient saturated zone, at the same time the more unstable slope; fissure expansive soil slope landslide sliding surface has the characteristics such as shallow features. Parameters change such as anchor rod, anchor length, anchor angle position have different influence on expansive soil slope safety factor under rainfall. On the basis of analysis, the reasonable way of anchor arrangement is put forward, in order to provide anchor arrangement design and reference suggestions for expansive soil slope.
Key wordsslopes;fissure;expansive soil;seepage;stability
引言 0
膨胀土边坡失稳是膨胀土地区的一个主要工程地质间题，膨胀土边坡的失稳多发生在暴雨过·北京市自热科学基金资助项目（8142032）
[作者简介】侯定贵，博士研究生，E-mail；boudinggui@126.com
[收稿日期】2015-01-12 万方数据
后，研究表明雨水人渗是膨胀土边坡失稳的主要外因[14]。膨胀土边坡在气候作用下形成干缩裂隙，裂隙随晴雨变化可不断发育。干缩裂缝的存在导致土体完整性降低，导致雨水极易入渗。在降雨条件下，表层土体孔隙水压力上升，负孔隙水压力减小，容重增大，且土体遇水强度降低，易导致边坡失