土工基础

土工基础 ›› 2020, Vol. 34 ›› Issue (4): 412-417.

• 工程实录 • 上一篇    下一篇

紧邻不同几何条件边坡的基坑支护结构变形规律分析

张 鼎1,2，张可能1,2，张云毅1,2，王彦之1,2，陈 骏3，王永招3   

  1. （1.有色金属成矿预测与地质环境监测教育部重点实验室，长沙 410083；2.中南大学地球科学与信息物理学院，长沙 410083；3.中建五局土木工程有限公司，长沙 410083）
  • 收稿日期:2019-09-03 修回日期:2019-10-09 出版日期:2020-08-20 发布日期:2020-08-15
  • 通讯作者: 张云毅（1988-），男，博士研究生，研究方向为地质工程及边坡工程。
  • 作者简介:张 鼎（1996-），男，在读硕士研究生，研究方向为岩土工程。

Analysis of Deformation Characteristic of an Excavation Supporting Structure Adjacent to Slopes with Various Geometric Conditions

ZHANG Ding1,2, ZHANG Keneng1,2, ZHANG Yunyi1,2, WANG Yanzhi1,2, CHEN Jun3, WANG Yongzhao3   

  1. (1.Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, 
    Ministry of Education, School of Geoscience and Infophysics, Central South University, Changsha 410083；
    2.School of Geoscience and Infophysics, Central South University, Changsha 410083；
    3.Civil Engineering Co., Ltd., China Construction Fifth Bureau, Changsha 410083)
  • Received:2019-09-03 Revised:2019-10-09 Online:2020-08-20 Published:2020-08-15

摘要： 郴州市某基坑工程位于湘南山岭地区，因地形及优化规划后仍存在基坑开挖场地紧邻高边坡的工程环境。高边坡对基坑的偏压作用会给基坑的支护结构带来额外的侧压力及变形，从而对基坑稳定和变形造成特殊的影响，需要通过分析基坑支护结构的变形特点，研究该基坑稳定性受高边坡的影响程度。运用Midas有限元模拟软件构建模型，对紧邻不同几何条件边坡的基坑支护桩的变形数据进行分析与总结，得出了不同条件下支护结构的变形特点，并对边坡对基坑侧壁的稳定性的影响程度进行评估。结果表明基坑在开挖过程中，支护桩最大变形位置出现在支护桩两排锚索之间。在同一坡高条件下基坑存在变形值急剧变化的临界坡比。基坑支护结构的变形在边坡坡比固定、坡高变化的条件下规律性更强。

关键词: 支护结构, 几何条件, 变形规律, 边坡稳定性, 基坑工程

Abstract: A deep excavation project in Chenzhou City is located in the mountainous area of southern Hunan Province. Due to the topographic limitations, the engineering environment of the excavation site adjacent to the high slope is induced. The eccentric effect of the high slope on the deep excavation would result in an additional lateral earth pressure and additional deformation to the supporting structures of the excavation, which has a great influence on the stability and deformation of the deep excavation system. It is necessary to analyze the deformation characteristics of the supporting structure and study the degree of stability affected by the high slope. The MIDAS finite element simulation software was used to establish the numerical model. The deformation data of the supporting pile under the different geometric conditions were analyzed and summarized to obtain the deformation characteristics of the support structure under different conditions. The effect of the stability on the sidewall of the excavated area was evaluated. The results show that during the excavation process, the maximum deformation of the soldier pile appears to be between the two rows of anchors of the supporting structure. Under the same slope height condition, the foundation pit has a critical slope ratio with deformation value changes significantly. The deformation of the supporting structure is more regular under the condition that the slope ratio of the slope is fixed.

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