Abstract: Based on the monitoring data of bored pile and soil slope of south anchor foundation of Runyang Yangtze River Suspension Bridge, the soil above certain depth is in compaction state, and the soil below it is in loose state. Thus it is proposed that the soil pressure on froze wall above this depth is the passive pressure and that below it is the active pressure, and the forces should be calculated by the theories of the passive and active earth pressures, respectively. Meantime, a conclusion is drawn that the force on the pile in row, the frost-heaving force caused by the frozen wall and the soil pressure on the frozen wall are the same in value. Compared with the piles in row with conventional sealing piles, the force on piles is earth pressure in passive state, and it is 37% to 184% greater than the active earth pressure calculated by the conventional theory. The above results provide a theoretical reference for the design of excavations by means of the freezing method.
[1] 黄建华. 深基坑冻结止水帷幕冻胀变形模拟分析与试验测试[J]. 岩石力学与工程学报, 2009, 28(12): 2554–2560. (HUANG Jian-hua. Simulation analysis and experimental test on frost deformation of freezing waterproof curtain in deep foundation pit[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(12): 2554–2560. (in Chinese))[2] 杨更社, 张 晶. 非均匀温度分布冻土墙围护深基坑开挖的有限元数值模拟[J]. 岩石力学与工程学报, 2003, 22(2): 316–320. (YANG Geng-she, ZHANG Jing. Finite element numerical simulation of deep foundation pit excavation supported by frozen soil wall with non-homogeneous temperature distribution[J]. Chinese Journal of Rock Mechanics and Engineering, 2003, 22(2): 316–320. (in Chinese))[3] 金永军, 杨维好. 冻土直墙用于基坑支护的研究[J]. 岩石力学与工程学报, 2004, 23(13): 2280–2285. (JIN Yong-jun, YANG Wei-hao. Application of linear frozen soil wall to support of foundation pit[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(13): 2280–2285. (in Chinese))[4] 姚直书, 程 桦. 锚碇深基坑排桩冻土墙围护结构的冻胀力研究[J]. 岩石力学与工程学报, 2004, 23(9): 1521–1524. (YAO Zhi-shu, CHEN Hua. Study on frost-heaving force in retaining structure with Row-pile and frozen soil wall for deep foundation pit[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(9): 1521–1524. (in Chinese))[5] 崔托维奇 H A. 冻土力学[M]. 北京: 科学出版社, 1985: 108–151. (CUI BULATOVIC H A. frozen soil mechanics[M]. Beijing: Science Press, 1985: 108–151. (in Chinese))[6] 裴 捷. 润扬长江公路大桥悬索桥南锚碇深基坑排桩冻结工法研究–基坑施工监测[R]. 上海: 上海申元岩土工程有限公司, 2003. (PEI Jie. Study on row-pile of freezing method in runyang yangtze river suspension bridge south anchorage deep foundation-pit construction monitoring[R]. Shanghai: Shanghai Shenyuan Geotechnical Engineering, 2003. (in Chinese))[7] JGJ 120—99建筑基坑支护技术规程[S]. 中国建筑科学研究院, 1999: 10–13. (JGJ 120—99 Construction Department of Shandong Province. Technical Specification for Retaining and Protection of Building Foundation Excavations JGJ 120-9 [S]. 1999: 10–13. (in Chinese))[8] J 11577—2010基坑工程技术规范[S]. 上海, 2010. (J 11577—2010 Shanghai Survey and Design Industry Association. Technical code for Excavation engineering[S]. Shanghai, 2010. (in Chinese))[9] 刘国彬, 王卫东. 基坑工程手册[M]. 2版. 北京: 中国建筑出版社, 2009. (LIU Guo-bin, WANG Wei-dong. excavation engineering manual[M]. 2nd ed. Beijing: China Architectural Press, 2009. (in Chinese))