西宁地区几个基坑工程问题分析与处理

发布时间：2018-02-27 23:29

本文关键词： 深基坑变形分析与处理建议　出处：《岩土工程学报》2014年S1期 　论文类型：期刊论文

【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。
[Abstract]:In order to solve the problem of land shortage and road traffic congestion, many cities in Northwest China have begun to build high-rise buildings and subways on a large scale, and a large number of deep foundation pits need to be excavated. The application of traditional supporting structures is restricted. The pile-anchor support is widely used in the deep foundation pit support in the loess region of northwest China because of its advantages of actively improving the stress state of the foundation pit soil and limiting the horizontal displacement of the lateral wall of the foundation pit. In this paper, several soil nailing walls are used in Xining area. The typical foundation pit engineering cases of composite soil nailing wall, prestressed anchor rod, supporting pile and so on, which are supported by deformation and collapse, are analyzed in detail, and the corresponding solutions are given. This paper summarizes the shortcomings in the design, construction and management of similar foundation pit engineering, and points out that the following research should be emphasized in the future: to establish the calculation model of earth pressure of retaining structure in unsaturated loess area based on displacement control, and to perfect the calculation method of earth pressure; The field test research of deep and large foundation pit support structure is strengthened, and the dynamic stability analysis model considering the synergistic work between prestressed anchor rod, supporting pile and soil is established. Finally, the key quality control points in construction of common supporting structure are pointed out.
【作者单位】：兰州理工大学甘肃省土木工程防灾减灾重点实验室;西部土木工程防灾减灾教育部工程研究中心;后勤工程学院建筑工程系;
【基金】：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)
【分类号】：TU753

【参考文献】