土工基础

›› 2016, Vol. 30 ›› Issue (6): 622-626.

• 工程实录 • 上一篇    下一篇

某超深基坑的支护实践

包惠明，刘文斌，余 雷   

  1. （桂林理工大学 土木与建筑工程学院， 广西桂林 541004）
  • 收稿日期:2016-06-02 修回日期:2016-07-04 出版日期:2016-12-20 发布日期:2016-12-22
  • 作者简介:包惠明（1963-），男，博士，教授，研究方向为路基路面工程，边坡工程，地质灾害防治等。
  • 基金资助:

    国家自然科学基金（5136 8015）

Application of Excavation Support System in a Very Large Deep Excavation

BAO Huiming, LIU Wenbin, YU Lei   

  1. (School of Civil and Architecture Engineering, Guilin University of Technology, Guilin 541004)
  • Received:2016-06-02 Revised:2016-07-04 Online:2016-12-20 Published:2016-12-22

摘要： 某工程规划总建筑面积约91040 m2，基坑开挖±0.000以下19.50 m，属于深基坑。深基坑开挖后,因固结性差的土层临空面在地下水渗流的动水压力作用下很快会失稳坍塌，要进行支护。根据建筑物上部荷载特征、地基土工程性能较差及地区工程建设经验，对该基坑各面选用合适的方法分别进行支护（AB段设计采用复合土钉墙支护方式；BCD段使用土钉墙+桩锚支护的方式；DEA段设计桩锚支护），提出施工方法及技术、质量和现场质量检测等方法和要求，以达到工程需要，保证基坑边坡稳定性与安全。

关键词: 基坑支护, 施工技术, 监测, 沉降, 降水工程

Abstract: A very large deep excavation project is located at the east and south sides of Fengshun Street and north side of the People’s Bank of China. The planned building area is approximately 91,040 square meters and the deepest excavation is approximately 19.5 meters below the proposed ground floor. Due to the high groundwater level, the excavation support is necessary otherwise the side soils would be collapsed under the seepage force. Based on the excavation requirements and the superstructure types, different excavation support systems are used: Segment AB was designed using combined soil nailed wall supporting system; Segment BCD used soil nailed wall plus soldier pile with ground anchor system; and Segment DEA utilized soldier pile with ground anchor as the primary support measure. The construction procedures, quality assurance and insitu monitoring at each segment are also presented in the paper.

Key words: Deep Excavation Support, Construction Technique, Construction Monitoring, Settlement, Dewatering Project