东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (9): 1353-1357.DOI: 10.12068/j.issn.1005-3026.2018.09.027

• 资源与土木工程 • 上一篇    下一篇

砂土地区深基坑稳定性评价及力学效应分析

陈阳， 赵文， 贾鹏蛟， 韩健勇   

  1. (东北大学 资源与土木工程学院， 辽宁 沈阳110819)
  • 收稿日期:2017-06-05 修回日期:2017-06-05 出版日期:2018-09-15 发布日期:2018-09-12
  • 通讯作者: 陈阳
  • 作者简介:陈 阳(1990-)，女，陕西延安人，东北大学博士研究生； 赵文(1962-)，男，内蒙古乌兰察布人，东北大学教授，博士生导师.冯明杰(1971-)， 男， 河南禹州人， 东北大学副教授; 王恩刚(1962-)， 男， 辽宁沈阳人， 东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51578116).国家自然科学基金资助项目(51171041).

Stability Assessment and Mechanical Effects Analysis on Deep Foundation Pit in Sandy Soil

CHEN Yang， ZHAO Wen， JIA Peng-jiao， HAN Jian-yong   

  1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.
  • Received:2017-06-05 Revised:2017-06-05 Online:2018-09-15 Published:2018-09-12
  • Contact: ZHAO Wen
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摘要： 结合某地铁车站基坑开挖工程，基于基坑支护结构的现场实测数据，对排桩内支撑基坑支护体系桩顶水平位移，桩体侧向位移及基坑周边土体沉降量进行分析，得出基坑围护结构各项位移和周边土体沉降随时间及开挖深度的变化规律.建立研究区二维有限元模型，并将实测数据与模拟值进行对比，研究支护结构内力变化及桩后土体应力状态.研究结果表明:基坑长边桩顶水平位移约为短边桩顶水平位移的3倍，桩体最大侧向变形量位于1/2H(H为基坑开挖深度)处;基坑开挖及降水引起地面沉降范围约3H，基坑周边各监测断面最大沉降量出现在距基坑边22m处(约0.82H~0.96H)，内支撑架设有助于增大基坑整体稳定性.

关键词: 砂土, 深基坑, 稳定性, 评价, 力学效应

Abstract: The horizontal and lateral displacements of pile-cap and the ground settlement of the surrounding soils of a foundation pit of a subway station in sandy soil were investigated based on the in-situ monitoring data. The changing rules of the displacement of the inner supporting system and the deformation of the surrounding soils with excavation time and excavation depth were obtained. A two-dimensional finite element model was built to analyze the internal forces of the supporting structures as well as the stress redistribution in soils behind those piles. Numerical results agree well with the in-situ monitoring data. Results indicate that the horizontal displacement of the pile-cap in the long side direction of the foundation pit is three times than that in the short side direction; the maximum lateral displacement of the piles occurs at 1/2H(H is the depth of the foundation pit). The range of the ground settlement induced by excavation and drainage is 3H. The largest deformation in the surrounding soil is located 22m away from the excavation edge(0.82H~0.96H). It is found that the inner supporting system can effectively improve the stability of the foundation pit.

Key words: sandy soil, deep foundation pit, stability, evaluation, mechanical effects

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