软土基坑设计若干关键问题探讨及基坑设计实例应用分析

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (1400 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract The soft soil in the Pearl River Delta area has the features of high water content，high compressibility and low carrying capacity，etc.，which has put forward more stricter requirements for the design and construction of foundation pit project. Therefore，the supporting design under complicated environment for deep foundation pit on soft soil has become a new topic for geotechnical engineering. According to the particularities of the soft soil foundation pit，four key problems during the foundation design of soft soil foundation pit are discussed：(1) The force and deformation processes of the supporting structure are analyzed by the incremental method. (2) When considering the impact of the prestresses of the pit anchoring bolts and anchoring cables，the prestress leads the soil on the positive side of the foundation to suffer pressure. Therefore，the soil mass at the positive side shall be equivalent to earth spring. As for whether the earth spring has participated in the impact shall be judged by the displacement of the earth spring. (3) When the soft and weak earth foundation existing during the slope cutting，it is not only need to verify the overall stability of the foundation pit，but also need to verify the stability and carrying capacity of the earth foundation. (4) There are many issues about the forcing and deformation of double-row piles supporting structure needing to be studied further. With the specific engineering，the simplified calculation method of double-row piles is proposed. Many soft foundation engineering accidents have also illuminated that the foundation will have potential hazard risk if the above four key problems have not been thoroughly considered. Finally，based on the design of soft soil deep foundation pit，taking the solving method of the above four key problems as the theoretical support，the rationality is verified；and the common design scheme for adopting multi-supporting techniques for soft soil deep foundation pits are analyzed in detail，so as to provide some guidances for other similar projects.

Key words： foundation pit engineering soft soil foundation pit incremental method prestress foundation stability compound support double-row steel sheet piles

Received: 20 August 2012

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors

Cite this article:

URL:

http://www.rockmech.org/EN/Y2012/V31/I11/2334

[1]	张玉成，杨光华，姚捷，等. 基坑开挖卸荷对下方既有地铁隧道影响的数值仿真分析[J]. 岩土工程学报，2010，32(增1)：109-115.(ZHANG Yucheng，YANG Guanghua，YAO Jie，et al. Numerical simulation and analysis of effect of excavation of foundation pits on metro tunnels[M]. Chinese Journal of Geotechnical Engineering，2010，32(Supp.1)：109-115.(in Chinese)) " target="_blank">
[3]	中华人民共和国行业标准编写组. JGJ120—99建筑基坑支护技术规程[S]. 北京：建筑工业出版社出版，1999.(The Professional Standards Compilation Group of People?s Republic of China. JGJ120—99 Technical specification for retaining and protection of building foundation excavations [S]. Beijing：China Architecture and Building Press，1999.(in Chinese)) " target="_blank">
[5]	杨光华. 深基坑支护结构的实用计算方法及其应用[M]. 北京：地质出版社，2004：35-54.(YANG Guanghua，The practical calculation method and application for the structure of retaining of building foundation excavation[M]. Beijing：Geological Publishing House，2004：35-54.(in Chinese)) " target="_blank">
[7]	杨光华，陆培炎. 深基坑开挖中考虑施工过程的多撑或多锚地下连续墙的增量计算法[J]. 建筑结构，1994，(8)：28-47.(YANG Guanghua，LU Peiyan. The incremental calculation method for the diaphragm wall with multi-brace or multi-anchor in deep excavation[J]. Building Structure，1994，(8)：28-47.(in Chinese)) " target="_blank">
[9]	杨光华. 路堤及堤坝等复杂荷载作用下软土地基的强度计算[C]// 第三届地基处理学术研讨会论文集. 杭州：浙江大学出版社，1992：622-625.(YANG Guanghua. The embankment or dam strength calculation of soft foundation under complicated loading[C]// Proceedings of the 3rd Chinese Symposium on Foundation Treatment. Hangzhou：Zhejiang University Press，1992：622-625.(in Chinese)) " target="_blank">
[11]	杨光华，钟志辉，张玉成，等. 用局部强度折减法进行边坡稳定性分析[J]. 岩土力学，2010，31(增2)：53-58.(YANG Guanghua，ZHONG Zhihui，ZHANG Yucheng，et al. Slope stability analysis by local strength reduction method[J]. Rock and Soil Mechanics，2010，31(Supp.2)：53-58.(in Chinese)) " target="_blank">
[2]	曾进群. 支撑体系对基坑支护结构变形和内力的影响分析[J]. 工业建筑，2004，(增2)：137-139.(ZENG Jinqun. The influence on the displacement and internal force of retaining structure to the system of support[J]. Industry Construction，2004，(Supp.2)：137-139.(in Chinese)) " target="_blank">
[4]	杨光华. 深基坑支护结构的实用计算方法及其应用[J]. 岩土力学，2004，25(12)：1 885-1 902.(YANG Guanghua. Practical calculation method of retaining structures for deep excavations and its application[J]. Rock and Soil Mechanics，2004，25(12)：1 885-1 902. (in Chinese)) " target="_blank">
[6]	陆培炎. 横向荷载作用下土、桩结构共同作用的简化法[J]. 广东水电科技，1991，(1)：1-10.(LU Peiyan. A simplified analysis of pile- soil interaction under lateral loading[J]. Guangdong Water Resources and Hydropower，1991，(1)：1-10.(in Chinese)) " target="_blank">
[8]	杨光华. 深基坑开挖中预应力锚杆或预应力支撑支护结构的计算分析[J]. 建筑结构，1996，(4)：9-12.(YANG Guanghua. The analysis of the retaining structure with prestressed anchor or prestressed brace in deep excavation[J]. Building Structure，1996，(4)：9-12.(in Chinese)) " target="_blank">
[10]	张玉成，杨光华，胡海英，等. 在软土地基上有反压护道路堤及堤坝的稳定计算[J]. 岩土力学，2007，28(增)：844-848.(ZHANG Yucheng，YANG Guanghua，HU Haiying，et al. Stability study of embankment or dam with back berm on soft soil foundation[J]. Rock and Soil Mechanics，2007，28(Supp.)：844-848.(in Chinese)) " target="_blank">