理论与试验研究

富水软土基坑组合式冻结加固模型试验研究

  • 亓源水 ,
  • 岳祖润 ,
  • 孙铁成 ,
  • 张松 ,
  • 顾相涛
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  • 1.石家庄铁道大学 土木工程学院,石家庄 050043;
    2.石家庄铁道大学 省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄 050043
亓源水(1996—),男,山东淄博人,硕士生,主要从事人工冻结相关研究。E-mail:892752260@qq.com
岳祖润(1962—),男,山东青岛人,博士,教授,主要从事冻土地区路基工程、变形控制与病害整治、人工冻结等研究。E-mail:yzr@stdu.edu.cn

收稿日期: 2023-09-27

  网络出版日期: 2024-05-09

基金资助

国家自然科学基金(52172347);唐山开滦集团资助项目(TZ2022-15,K2020-03)

Model Test Research on Foundation Pit Supporting by Combined Artificial Freezing Methodwith Water-Rich and Soft Clay Area

  • Qi Yuanshui ,
  • Yue Zurun ,
  • Sun Tiecheng ,
  • Zhang Song ,
  • Gu Xiangtao
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  • 1. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, P.R. China;
    2. State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University, Shijiazhuang 050043, P.R. China

Received date: 2023-09-27

  Online published: 2024-05-09

摘要

近年来随着环保理念的贯彻和对城市水资源保护的重视,许多地区对地下水抽排进行限制,导致大量基坑工程必须寻找新的止水方式。对此,“地下连续墙+水平冻结封底”的组合式冻结加固被提出,利用模型试验对其在不同水压地层中可行性和差异性进行了分析,验证了该支护方式的可行性。结果表明:(1)随着水头高度的增大,冻结壁水分补给速率有所提升,冻结壁交圈时间与地层水头高度呈正相关,而冻结壁厚度与地层水头高度呈负相关关系。(2)临时竖井受地层冻结影响,会有明显冻胀压迫作用,伴随冻结壁发育,冻胀力最终降至某一特定值,并趋于平稳,且其峰值与水头高度成正相关关系;(3)模型试验中冻结壁上部土体的最大位移点位于土体35 cm深度位置,其位移数据为2~3 mm;(4)基坑开挖期间,冻土帷幕的温度随着基坑的开挖和积极冻结的双重作用下能够维持相对的平衡,整个冻结壁保持基本稳定状态。研究成果可为该支护方式在基坑工程中的应用提供理论支撑。

本文引用格式

亓源水 , 岳祖润 , 孙铁成 , 张松 , 顾相涛 . 富水软土基坑组合式冻结加固模型试验研究[J]. 地下空间与工程学报, 2024 , 20(2) : 535 -545 . DOI: 10.20174/j.JUSE.2024.02.20

Abstract

In recent years, with the implementation of the concept of environmental protection and the needs of urban water resources protection, many areas have restricted the pumping of groundwater, resulting in a large number of foundation pit projects must find new ways to stop water. In this regard, a new foundation pit supporting method " underground diaphragm wall + horizontal frozen back cover " is proposed. The feasibility and difference of the combined freezing artificial method in different height of water head are analyzed by model test. The experimental results show that: ①the connection for construction of frozen wall is positively correlated with formation head height, while the thickness of frozen wall is negatively correlated with formation head height. ②Affected by stratum freezing, the temporary shaft will have obvious frost heaving compression. With the development of frozen wall, the frost heaving force will appear two peak values, and finally decrease to a certain value, and then tend to be stable, and the peak value is correlated with head height. ③The maximum displacement point in the model test is 35cm layer position, and the displacement data is 2~3 mm. ④During excavation unloading, The temperature of frozen soil curtain maintain relative balance with the double action of excavation of foundation pit and active freezing. The relevant research results have certain reference value for the application of combined freezing method in foundation pit engineering.

参考文献

[1]叶为民, 万敏, 陈宝, 等.深基坑承压含水层降水对地面沉降的影响[J]. 地下空间与工程学报, 2009,5(增2):1799-1805. (Ye Weimin, Wan Min, Chen Bao, et al. Influence of dewatering of confined aquifers on land subsidence during deep excavation[J]. Chinese Journal of Underground Space and Engineering, 2009,5(Supp.2):1799-1805.(in Chinese))
[2]金小荣, 俞建霖, 祝哨晨, 等.基坑降水引起周围土体沉降性状分析[J].岩土力学,2005, 26(10):54-60.(Tan Zhuoying, Cai Meifeng, Yue Zhongqi, et al. Analysis of behaviors of settlement of pit's surrounding soils by dewatering[J]. Rock and Soil Mechanics, 2005, 26(10):54-60.(in Chinese))
[3]张扬清. 基坑卸荷影响下减压降水引起土体变形的特性及控制研究[D]. 上海:上海交通大学, 2018. (Zhang Yangqing. Study on the characteristic and control of soil deformation induced by dewatering in confined aquifer during excavation[D]. Shanghai: Shanghai Jiao Tong University, 2018.(in Chinese))
[4]王连俊, 朱孝笑, 张光宗. 济南西客站站房基坑降水对京沪高铁路基沉降影响分析[J].工程地质学报, 2012,20(3):459-465. (Wang Lianjun, Zhu Xiaoxiao, Zhang Guangzong. Analysis of subgrade settlement of Beijing-Shanghai high-speed railway due to dewatering for foundation pit at Jinan railway station [J]. Journal of Engineering Geology, 2012,20(3):459-465.(in Chinese))
[5]北京市建设委员会北京市水务局关于印发《北京市建设工程施工降水管理办法实施细则》的通知[N].北京市人民政府公报,2008(7):90-92.(Beijing municipal construction commission beijing municipal water bureau on the issuance of the Beijing notice on the implementation rules of the measures for the management of precipitation in construction projects [N]. Beijing Municipal People's Government Bullentin, 2008(7): 90-92. (in Chinese))
[6]毕书琦, 甘彬霖. 基坑冻结围护的研究现状与发展展望[J].土工基础, 2021,35(3):365-370.(Bi Shuqi, Gan Binlin. State of the art review fo freezing in support of excavation engineering [J]. Soil Eng and Foundation, 2021,35(3):365-370.(in Chinese))
[7]孙杰龙, 任建喜, 陈兴周, 等.富水砂层斜井冻结壁温度场分布规律研究[J].煤炭工程, 2020,52(11):126-131.(Sun Jielong, Ren Jianxi, Chen Xingzhou, et al. Temperature field distribution law of inclined freezing shaft in water-rich sand stratum [J]. Coal Engineering, 2020,52(11):126-131.(in Chinese))
[8]张晋勋, 亓轶, 杨昊, 等.等. 北京砂卵石地层盆形冻结的温度场扩展规律研究[J].岩土力学, 2020,41(8):2796-2804, 2813. (Zhang Jinxun, Qi Yi, Yang Hao, et al. Temperature field expansion of basin-shaped freezing technology in sandy pebble stratum of Beijing [J]. Rock and Soil Mechanics, 2020,41(8):2796-2804, 2813.(in Chinese))
[9]郜新军, 李铭远, 张景伟, 等. 富水粉质黏土中地铁联络通道冻结法试验研究[J]. 岩石力学与工程学报, 2021,40(6):1267-1276. (Gao Xinjun, Li Mingyuan, Zhang Jingwei, et al. Field research on artificial freezing of subway cross passages in water-rich silty clay layers [J]. Chinese Journal of Rock Mechanics and Engineering, 2021,40(6):1267-1276.(in Chinese))
[10]曹军军, 伍旺, 郑鹏飞, 等. 富水砂卵石地层联络通道人工冻结温度场分析[J]. 铁道建筑, 2019,59(12):55-59. (Cao Junjun, Wu Wang, Zheng Pengfei, et al.Analysis of artificial freezing temperature field for connected adit in water-rich sandy pebble stratum[J]. Railway Engineering, 2019,59(12):55-59.(in Chinese))
[11]苗立新, 齐修东, 邹超, 等. 冻结法在盾构接收端头土体加固中的应用[J]. 铁道工程学报, 2011,28(9):105-109. (Miao Lidong, Qi Xiudong, Zou Chao, et al. Application of freezing method in reinforceing soil on shield ends [J]. Journal of Railway Engineering Society, 2011,28(9):105-109.(in Chinese))
[12]芮大虎, 武迎飞, 陈雪, 等. 复合冻融与淋洗方法修复重金属污染黏性土的研究[J]. 岩土工程学报, 2019,41(2):286-293. (Rui Dahu, Wu Yingfei, Chen Xue, et al. Remediation of heavily metal-contaminated clayey soils by composite freeze-thaw and soil washing method [J]. Chinese Journal of Geotechnical Engineering, 2019,41(2):286-293.(in Chinese))
[13]张松, 岳祖润, 卢相忠, 等. 冻结法施工中冻结管断裂的影响及其处理方法[J]. 城市轨道交通研究, 2020,23(12):99-102. (Zhang Song, Yue Zurun, Lu Xiangzhong, et al.Impact and treatment method of freeze pipe fracture in AGF project[J]. Chinese Journal of Geotechnical Engineering, 2020,23(12):99-102.(in Chinese))
[14]蔡海兵, 程桦, 彭丽敏, 等. 地铁双线隧道水平冻结位移场的模型试验[J]. 岩石力学与工程学报, 2009,28(10):2088-2095. (Cai Haibing, Cheng Hua, Peng Limin, et al. Model test on displacement field of double-route metro constructed with horizontal freezing method [J]. Chinese Journal of Geotechnical Engineering, 2009,28(10):2088-2095.(in Chinese))
[15]姚直书, 程桦, 夏红兵, 等. 特深基坑排桩冻土墙围护结构的冻胀力模型试验研究[J]. 岩石力学与工程学报, 2007,26(2):415-420. (Yao Zhishu, Cheng Hua, Xia Hongbing, et al. Model test study on frozen-heaving force in retaining structure of row-piles and frozen soil wall of super deep foundation pit[J]. Chinese Journal of Geotechnical Engineering, 2007,26(2):415-420 (in Chinese))
[16]崔广心. 相似理论与模型试验[M]. 徐州:中国矿业大学出版社, 1990. (Cui Guangxin. Similarity theory and model tests [M]. Xuzhou: China Mining University Press, 2003. (in Chinese))
[17]张世雷, 汪磊, 何越磊, 等. 考虑热力管线影响的地铁联络通道冻结温度场分布[J]. 铁道建筑, 2021,61(11):74-77, 99. (Zhang Shilei, Wang Lei, He Yuelei, et al. Distribution of frtezing temperature field of subway connection passage considering influence of thermal pipeline [J]. Railway Engineerin, 2021,61(11):74-77, 99. (in Chinese))
[18]胡向东, 方涛, 郭晓东, 等. 拱北隧道管幕冻结法现场原型试验解冻温度场实测研究[J]. 煤炭学报, 2017,42(7):1700-1705. (Hu Xiangdong, Fang Tao, Guo Xiaodong, et al. Temperature field research on thawing process of freeze-sealing pipe roof method in gongbei tunnel by in-situ prototype test [J]. Journal of China Coal Society, 2017,42(7):1700-1705. (in Chinese))
[19]Hu X D, Fang T,Zhang L Y. Analytical solution to temperature distribution in frozen soil wall[J]. Cold Regions Science and Technology, 2020, 175: 103076.1-1036076.12.
[20]王建洲, 刘书幸, 周国庆, 等. 深季节冻土地区基坑工程水平冻胀力试验研究[J]. 中国矿业大学学报, 2018,47(4):815-821. (Wang Jianzhou, Liu Shuxing, Zhou Guoqing, et al. Model experiment on forst-heave of foundation pit at deepseasonal frozen regions [J].Journal of China University of Mining & Trchnology, 2018,47(4):815-821. (in Chinese))
[21]杨平, 陈瑾, 张尚贵, 等. 软弱地层联络通道冻结法施工温度及位移场全程实测研究[J]. 岩土工程学报, 2017,39(12):2226-2234. (Yang Ping,Chen Jin, Zhang Shanggui, et al. Whole range monitoring for temperature and displacement fields of cross passage in soft soils by AGF [J]. Chinese Journal of Geotechnical Engineering, 2017,39(12):2226-2234. (in Chinese))
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