Monitoring and analysis of deep foundation pit at Xintang Road-Jingfang Road cross of Hangzhou metro
DING Zhi1, 2, WANG Da1, YU Xing-fu1, WANG Jin-yan1, 2, JIANG Ji-qing1
1. Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, China; 2. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310027, China
Abstract:By analyzing the monitoring data of an underground deep foundation pit at Xintang Road-Jingfang Road cross of Hangzhou metro, including horizontal displacement of diaphragm wall, axial force of steel bracing, ground settlement and groundwater fluctuation etc., some valuable conclusions and suggestions are obtained. It is shown that the horizontal displacement of soils is one of the most important reasons that lead to that of wall. The difference between the monitoring data of different walls is concerned with the soil texture. The degree of ground settlement and the horizontal displacement are closely related. Unusual change of the groundwater in foundation pit always results in subsidence of neighboring ground. Before excavation, the axial force of steel bracing should be paid more attention to, and the horizontal displacement should be monitored after excavation. The increasing frequency of monitoring axial force is a good way to ensure construction safety.
丁智, 王达, 虞兴福, 王金艳, 蒋吉清. 杭州地铁新塘路、景芳路交叉口工程深基坑监测分析[J]. 岩土工程学报, 2013, 35(zk2): 445-451.
DING Zhi, WANG Da, YU Xing-fu, WANG Jin-yan, JIANG Ji-qing. Monitoring and analysis of deep foundation pit at Xintang Road-Jingfang Road cross of Hangzhou metro. Chinese J. Geot. Eng., 2013, 35(zk2): 445-451.
[1] O'ROURKE T D. Ground movements caused by braced excavations[J]. Journal of the Geotechnical Engineering Division, ASCE, 1981, 107(9): 1159-1178. [2] LONG M. Database for retaining wall and ground movements due to deep excavations[J]. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 2001, 127(33): 203-224. [3] MOORMANN C. Analysis of wall and ground movements dueto deep excavations in soft soil based on a new worldwide database[J]. Soils and Foundations, 2004, 44(1): 87-98. [4] 徐中华. 上海地区支护结构与主体地下结构相结合的深基坑变形性状研究[D]. 上海: 上海交通大学, 2007. (XU Zhong-hua. Deformation behavior of deep excavations supported by permanent structure in Shanghai soft deposit[D]. Shanghai: Shanghai Jiaotong University, 2007. (in Chinese)) [5] 杨有海, 王建军, 武进广, 等. 杭州地铁秋涛路车站深基坑信息化施工监测分析[J]. 岩土工程学报, 2008, 30(10): 1550-1554. (YANG You-hai, WANG Jian-jun, WU Jin-guang, et al. Informationized construction monitoring analysis of deep foundation pit for Qiutao Road Station of Hangzhou Metro[J]. Chinese Journal of Geotechnical Engineering, 2008, 30(10): 1550-1554. (in Chinese)) [6] 张忠苗, 赵玉勃, 吴世明, 等. 过江隧道深基坑中SMW工法加钢支撑维护结构现场监测分析[J]. 岩石力学与工程学报 2010, 29(6): 1270-1278. (ZHANG Zhong-miao, ZHAO Yu-bo, WU Shi-ming, et al. In-situ monitoring analysis of retaining structures of SMW piles plus steel support in deep foundation pit of river-crossing tunnel[J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(6): 1270-1278. (in Chinese)) [7] 张雪婵, 龚晓南, 尹序源, 等. 杭州庆春路过江隧道江南工作井监测分析[J]. 岩土力学, 2011, 32(增刊1): 488-494. (ZHANG Xue-chan, GONG Xiao-nan, YIN Xu-yuan, et al. Monitoring analysis of retaining structures for Jiannan foundation pit of Qingchun road river-crossing tunnel in Hangzhou[J]. Rock and Soil Mechanics, 2011, 32(S1): 488-494. (in Chinese))