西宁地区几个基坑工程问题分析与处理

杨校辉; 朱彦鹏; 郭楠; 黄雪峰

doi:10.11779/CJGE2014S1036

西宁地区几个基坑工程问题分析与处理 English Version

杨校辉^{1, 2},
朱彦鹏^{1, 2},
郭楠^{1, 2},
黄雪峰^{1, 3}

1. 兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州 730050;
2. 西部土木工程防灾减灾教育部工程研究中心,甘肃兰州 730050;
3. 后勤工程学院建筑工程系,重庆 401311

基金项目: 国家科技支撑计划项目（2011BAK12B07）; 教育部创新团队支持计划项目（2013 IRT13068）

详细信息

作者简介:
杨校辉(1986-),男,博士研究生,主要从事非饱和土与特殊土地基处理、支挡结构等方面的研究工作。E-mail:yxhui86@126.com。

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出版历程
- 收稿日期: 2014-07-27
- 发布日期: 2014-07-27

Analysis and treatment for several engineering problems of foundation pits in Xining area

YANG Xiao-hui^{1, 2},
ZHU Yan-peng^{1, 2},
GUO Nan^{1, 2},
HUANG Xue-feng^{1, 3}

1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China;
2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China;
3. Department of Architectural Engineering, Logistical Engineering University of PLA, Chongqing 401311, China

摘要

摘要: 为了解决用地紧张和道路交通拥挤问题,西北地区很多城市开始大规模修建高层建筑和地铁,需要开挖大量深基坑。传统支护结构的应用受到限制,而桩锚支护由于具有主动改善基坑土体的受力状态、限制基坑侧壁水平位移的优点,在西北黄土地区深基坑支护中得到广泛应用。本文借助西宁地区几个采用土钉墙、复合土钉墙、预应力锚杆、支护桩等结构型式进行支护,发生变形垮塌的典型基坑工程案例,详细分析了其设计和施工中存在的问题,给出了相应的解决方案。同时,总结了当前类似基坑工程的设计、施工和管理等方面的不足,指出了今后应重点研究：建立基于位移控制的非饱和黄土地区支挡结构土压力计算模型,完善土压力计算方法;加强深大基坑支护结构的现场测试研究,建立考虑预应力锚杆、支护桩和土体之间协同工作的动态稳定性分析模型。最后指出了常用支护结构施工中的关键质量控制点。
- 深基坑 /
- 变形 /
- 分析与处理 /
- 建议
Abstract: In order to solve the problems of land shortage and road traffic congestion, many cities in the northwest area of China begin to construct large-scale high-rise buildings and subways, which need excavate a lot of deep foundation pits. The application of the traditional supporting structures is restricted, while the pile-anchor supporting structures are widely used in deep and large scale founadation pits in northwest loess area owing to the advantages of initiativly improving the stress state of pit soils and limiting the horizontal displacement of pit sidewall. Based on deformation of typical foundation pits and collapse of several bracing projects in Xining area, such as the soil-nailing wall, composite soil-nailing wall, prestressed anchor, supporting pile, the existing problems in the design and construction are analyzed, and the corresponding solutions are proposed. At the same time, the lack of the current and similar excavation engineering in such aspects as design, construction and management is summarized, and the future researches should include: (1) establishment of soil pressure model based on displacement control of retaining structures in unsaturated areas, and improvement of soil pressure method; (2) strengthening of the field tests on retaining structures for deep and large foundation pits and establishment of dynamic stability model considering cooperative work of prestressed anchors, piles and soils. Finally, the common key quality control points are put forward in the construction of retaining structures.
- deep foundation pit /
- deformation /
- analysis and treatment /
- suggestion

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参考文献(11)

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