周洁, 郭仲秋, 王传鹤, 赵文强, 唐益群. 2021: 组合地层渗流作用下人工冻结软土冻融特性模型试验研究. 工程地质学报, 29(S1): 360-367. DOI: 10.13544/j.cnki.jeg.2021-0446
    引用本文: 周洁, 郭仲秋, 王传鹤, 赵文强, 唐益群. 2021: 组合地层渗流作用下人工冻结软土冻融特性模型试验研究. 工程地质学报, 29(S1): 360-367. DOI: 10.13544/j.cnki.jeg.2021-0446
    ZHOU Jie, GUO Zhongqiu, WANG Chuanhe, ZHAO Wenqiang, TANG Yiqun. 2021: MODEL TEST STUDY ON FREEZE-THAW CHARACTERISTICS OF ARTI-FICIALLY FROZEN SOFT CLAY UNDER COMPOSITE STRATA SEEPAGE. JOURNAL OF ENGINEERING GEOLOGY, 29(S1): 360-367. DOI: 10.13544/j.cnki.jeg.2021-0446
    Citation: ZHOU Jie, GUO Zhongqiu, WANG Chuanhe, ZHAO Wenqiang, TANG Yiqun. 2021: MODEL TEST STUDY ON FREEZE-THAW CHARACTERISTICS OF ARTI-FICIALLY FROZEN SOFT CLAY UNDER COMPOSITE STRATA SEEPAGE. JOURNAL OF ENGINEERING GEOLOGY, 29(S1): 360-367. DOI: 10.13544/j.cnki.jeg.2021-0446

    组合地层渗流作用下人工冻结软土冻融特性模型试验研究

    MODEL TEST STUDY ON FREEZE-THAW CHARACTERISTICS OF ARTI-FICIALLY FROZEN SOFT CLAY UNDER COMPOSITE STRATA SEEPAGE

    • 摘要: 人工地层冻结法是一种广泛应用于沿海隧道施工的方法,随着沿海地区越来越多地下工程建设,以砂-黏组合地层渗流为主要代表的复合地层给人工地层冻结法施工带来了新的挑战。本文依托浦东机场新建卫星厅联络通道冻结法案例,采用模型试验的方法模拟砂层渗流对上覆软黏土冻结过程的影响,设置不同渗流条件下的试验作为对照,分析了冻结法施工过程中,水在砂层中不同的渗流速度对上部软黏土冻融位移、温度场分布及含水率变化的影响;并通过图形处理软件对冻结过程中软黏土裂隙扩展进行分析。结果发现砂-黏组合地层中水在砂层的渗流会促进上部软黏土水分迁移,并促进软黏土裂隙的发展,引发融沉量增加、冻结壁发育不规则等问题。研究结果可为冻结法在砂-黏组合地层中的应用提供重要的理论依据及参考意义。

       

      Abstract: Artificial ground freezing(AGF) is a construction method widely used in coastal tunnel engineering reinforcement. With more underground construction in coastal areas, clay-sand composite strata bring more challenges to AGF. Based on the actual engineering case of AGF, we designed a model tests to simulate the influence of soft clay-sand composite strata seepage on freezing process. We analyzed the frost heave displacement, temperature field distribution and water content change of upper clay layer under different seepage conditions of the underlying sand layer. We find that the existence of seepage in soft clay-sand composite strata not only influence the development of frozen wall, but also promotes the water migration of upper clay layer. Meantime paralleled fissures are well-developed surrounding frozen wall observed by image during freezing and subsequent image processing. All above increases thaw settlement and shorten the duration sharply. The research results above can provide important theoretical basis and significant reference for the application of AGF in soft clay-sand composite strata.

       

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