自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第46卷    第10期    总第254期    2015年10月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2015)10-3774-08
微型桩组合结构加固边坡稳定性耦合分析
孙书伟1,陈冲1,王卫1,朱本珍2

(1. 中国矿业大学(北京) 资源与安全工程学院,北京,100083;
2. 中铁西北科学研究院有限公司,甘肃 兰州,730000
)

摘 要: 采用数值分析方法,对微型桩组合结构加固边坡的稳定性进行耦合分析,通过分析微型桩组合结构加固前后边坡破坏模式的变化,系统研究微型桩组合结构的桩位、桩长、岩土类型及顶梁布置方式等对边坡稳定性的影响。研究结果表明:耦合作用下均质土边坡的破坏模式与微型桩组合结构的布设位置关系较大,对于常见的均质黏土边坡,将微型桩组合结构布置在边坡中上部能够取得更好的加固效果,微型桩的最优锚固长度约为滑面以上自由段长度的2倍;微型桩组合结构加固不同岩土类型边坡的效果相差较大,黏土和粉砂质边坡的加固效果较好,砂性土边坡的加固效果较差;顶梁布置形式对微型桩组合结构加固边坡效果有重要影响,采用行列式布置顶梁的效果优于锯齿状等顶梁布置方式。研究成果对微型桩组合结构加固边坡、滑坡的工程设计和安全评价具有借鉴 意义。

 

关键字: 微型桩组合结构;边坡稳定性;破坏模式;耦合分析

Coupled stability analysis for slope reinforced by micropile composite structure
SUN Shuwei1, CHEN Chong1, WANG Wei1, ZHU Benzhen2

1. Faculty of Resources and Safety Engineering,
China University of Mining and Technology (Beijing), Beijing 100083, China;
2. Northwest Research Institute Co., Ltd of CREC, Lanzhou 730000, China

Abstract:Micropile composite structures were typically composed of micropiles and cap beams. They were common reinforcements used for slope stabilizing in emergency condition in recent years. Based on numerical analysis method, the coupled analysis was conducted on the stability of micropile composite structures reinforced slope. By comparing the failure modes of non-reinforced slope and micropile composite structures reinforced slope, the influence of pile location, pile length, pile connections and soil type was analyzed. The results show that the position of the micropile composite structures plays a dominating role in the slope failure modes. For a homogeneous slope, a larger safety factor is obtained when the micropile composite structures are placed in the middle-upper part of slopes, and the optimum ratio of anchorage length and free length is about 2.0. For different soil materials, stability of slopes with micropile composite structures is improved, but the level of its improved safety factor is different, reinforcement of silty and clayey slope with micropile composite structures is the best, but sandy slope with micropile composite structures is poor. Rigid pile caps connecting micropiles can obviously improve the safety factor of a reinforced slope, and the parallel micropile frame performs better than staggered arrangement. The results of this research can provide a useful basis for the design and stability analysis of slopes reinforced by micropile composite structures.

 

Key words: micropile composite structures; slope stability; failure mode; coupling analysis

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号