Design and construction technology of displacement control in deep miscellaneous fill foundation pits
SUN Jian-ping1, SHAO Guang-biao1, JIANG Zong-bao2
( 1. School of Civil Engineering, Shandong Jianzhu University, Ji'nan 250101, China; 2. Institute of Engineering Identification and Reinforcement of Shandong Ji'anda, Ji'nan 250014, China)
Abstract： Displacement and settlement are easily generated in foundation pits at miscellaneous fill site because of arbitrary fills, component complexity and heterogeneous characteristics and have lower cohesive force and internal friction angle. There is a foundation pit with deep miscellaneous fill in Jinan. The fills are construction wastes and domestic refuse for 30 years and the depth is up to 18~20 m. The pit needs to be excavated to more than 11 m in depth. There is a freestone retaining wall 3.0 m away from the slope top and the wall is 3.0~3.5 m higher than the slope crest. Design of displacement control is required in deep miscellaneous fill site due to damages of freestone retaining wall and road induced by large deformation of the pit. According to engineering geology and surrounding environment, the pile-anchor support is used and the reinforcement in active and passive zones are taken into accounted simultaneously. Through the monitoring data, the displacement control of the pit achieves better results, and it may provide reference for similar projects.
孙剑平, 邵广彪*, 江宗宝. 深厚杂填土基坑位移控制设计与施工技术[J]. 岩土工程学报, 2012, 34(suppl): 576-580.
SUN Jian-ping, SHAO Guang-biao, JIANG Zong-bao. Design and construction technology of displacement control in deep miscellaneous fill foundation pits. Chinese J. Geot. Eng., 2012, 34(suppl): 576-580.
[1] 夏成昊. 长沙某基坑变形过大原因分析及治理[J]. 广东建材, 2011, 27(2): 59–62. (XIA Cheng-hao. Cause analysis and management of large deformation of foundation pit in Changsha[J]. Guangdong Building Materials, 2011, 27(2): 59–62. (in Chinese))[2] 芦清建, 张志平, 程 学. 北京某深基坑边坡变形过大原因分析[J]. 岩土工程技术, 2010, 24(5): 264–266. (LU Qing-jian, ZHANG Zhi-ping, CHEN Xue. Cause analysis of large deformation of deep foundation pit in Beijing[J]. Geotechnical Engineering Technique, 2010, 24(5): 264–266. (in Chinese))[3] 邵国波, 苌红涛, 张建波. 主动区加固控制邻近基坑桩基础变形分析[J]. 公路, 2010, 39(8): 102–106. (SHAO Guo-bo, CHANG Hong-tao, ZHANG Jian-bo. Influence analysis of active zone reinforcement on pile foundation adjacent to excavation[J]. Highway, 2010, 39(8): 102–106. (in Chinese))[4] 郑俊杰, 章荣军, 丁烈云, 等. 基坑被动区加固的位移控制效果及参数分析[J]. 岩石力学与工程学报, 2010, 29(5): 1042–1051. (ZHENG Jun-jie, ZHANG Rong-jun, DING Lie-yun, et al. Displacement control effects and parameter analysis of passive zone improvement of foundation pits[J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(5): 1042–1051. (in Chinese))
