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| 软土地区采用灌注桩围护的深基坑变形性状研究 | |
| 引用本文： | 徐中华,王建华,王卫东.软土地区采用灌注桩围护的深基坑变形性状研究[J].岩土力学,2009,30(5):1362-1366. |
| 作者姓名： | 徐中华 王建华 王卫东 |
| 作者单位： | 1. 上海交通大学,土木工程系,上海,200030;华东建筑设计研究院,上海,200002 2. 上海交通大学,土木工程系,上海,200030 3. 华东建筑设计研究院,上海,200002 |
| 摘 要： | 根据上海软土地区80个钻孔灌注桩围护的深基坑工程案例有关数据，系统地分析了基坑开挖引致的灌注桩变形性状。所有基坑的灌注桩最大侧向位移介于0.1 %～1.0 %倍的开挖深度之间，平均值为开挖深度的0.44 %。钢筋混凝土支撑和钢支撑在控制墙体的变形上没有明显差别，最大侧向位移一般位于开挖面上下5 m的范围内。无量纲化最大侧向位移随着支撑系统刚度的增大而减小，随着墙底以上软土层厚度的增加而增大，但与灌注桩插入比及坑底抗隆起稳定系数之间并无明显的关系。墙顶侧向位移随着首道支撑位置深度的增加而呈现出指数增长的趋势，而灌注桩最大侧向位移与首道支撑的深度位置无明显关系。 |
| 关 键 词： | 深基坑 灌注桩 工程案例 变形 软土 |
| 收稿时间： | 2007-08-27 |
Deformation behavior of deep excavations retained by bored pile wall in soft soil |
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| XU Zhong-hua,WANG Jian-hua,WANG Wei-dong.Deformation behavior of deep excavations retained by bored pile wall in soft soil[J].Rock and Soil Mechanics,2009,30(5):1362-1366. | |
| Authors: | XU Zhong-hua WANG Jian-hua WANG Wei-dong |
| Institution: | 1. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200030, China; 2. East China Architectural Design & Research Institute, Shanghai 200002, China |
| Abstract: | Deformation behavior of bored pile wall is analyzed based on a database of some 80 case histories of deep excavations in Shanghai soft deposit. The maximum lateral deflection of bored pile wall ranges from 0.1 % to 1.0 % of the excavation depth, with a mean value of 0.44 % of the excavation depth. The location of the maximum lateral deflection of wall occurs 5 m around the excavation surface. No significant difference of wall deflection was observed between the concrete strut group and the steel strut group. Normalized maximum lateral deflection of wall decreases with increasing the system stiffness, while increases with increasing the thickness of soft soil above wall toe. Neither depth ratio nor factor of safety against basal heave has significant effect on maximum lateral deflection of wall. Lateral displacement of top of wall increases exponentially with the depth of the first level strut. However, location of the first level strut does not have significant effect on the maximum lateral deflection of bored pile wall. |
| Keywords: | deep excavation bored pile wall case histories deflection soft soil |
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