毛洪运, 朱江鸿, 喻小, 毕俊翔, 李忠民. 2019: 强夯法消除风积粉细砂湿陷性研究. 工程地质学报, 27(4): 745-752. DOI: 10.13544/j.cnki.jeg.2018-113
    引用本文: 毛洪运, 朱江鸿, 喻小, 毕俊翔, 李忠民. 2019: 强夯法消除风积粉细砂湿陷性研究. 工程地质学报, 27(4): 745-752. DOI: 10.13544/j.cnki.jeg.2018-113
    MAO Hongyun, ZHU Jianghong, YU Xiao, BI Junxiang, LI Zhongmin. 2019: DYNAMIC COMPACTION STUDY OF ELIMINATING THE COLLAPSIBILITY OF EOLIAN DEPOSIT FINE SAND. JOURNAL OF ENGINEERING GEOLOGY, 27(4): 745-752. DOI: 10.13544/j.cnki.jeg.2018-113
    Citation: MAO Hongyun, ZHU Jianghong, YU Xiao, BI Junxiang, LI Zhongmin. 2019: DYNAMIC COMPACTION STUDY OF ELIMINATING THE COLLAPSIBILITY OF EOLIAN DEPOSIT FINE SAND. JOURNAL OF ENGINEERING GEOLOGY, 27(4): 745-752. DOI: 10.13544/j.cnki.jeg.2018-113

    强夯法消除风积粉细砂湿陷性研究

    DYNAMIC COMPACTION STUDY OF ELIMINATING THE COLLAPSIBILITY OF EOLIAN DEPOSIT FINE SAND

    • 摘要: 沙漠地区的风积粉细砂具有轻微至严重的湿陷性,消除该类地基土的湿陷性是工程学术界亟待解决的问题。结合工程实例,采用强夯法加固风积粉细砂地基土,通过浅层平板载荷试验及室内土工试验检测加固情况,评价强夯法消除风积粉细砂地基湿陷性的效果及规律。结果表明,风积粉细砂的湿陷性主要受含水率及密实度的影响,含水率对于湿陷变形作用尤其突出;强夯施工前,应对场地洒水充足,使土体含水率达到最优含水率;强夯加固中,填方区最佳锤击数为10击,挖方区最佳锤击数为8击,坚持动态化设计信息化施工;强夯后,风积粉细砂的承载力是强夯前的两倍,在湿陷试验中风积粉细砂变形增量随时间变化较少;强夯法改善风积粉细砂湿陷性效果显著,其中,洒水是控制湿陷性的主要因素,强夯是次要因素。研究结果有助于为强夯法处理风积粉细砂地基的设计、施工提供参考,为同类型地基处理提供借鉴。

       

      Abstract: The eolian deposit fine sand in desert area has slight to severe collapsibility. Eliminating the collapsibility for the foundation soil of eolian deposit fine sand is a problem to be solved urgently in engineering. Combined with the engineering example, the dynamic compaction method is used to reinforce the foundation soil of eolian deposit fine sand. The effect and law of the dynamic compaction method to eliminate the collapsibility of the eolian deposit fine sand are evaluated with shallow plate loading test and laboratory soil test. The results show that the collapsibility of the eolian deposit fine sand is mainly affected by the moisture content and the density. The water content is especially prominent for the collapsible deformation. Before the dynamic compaction, the water content of the soil should be sufficient to make the soil moisture content reach the optimal water content. In the dynamic consolidation and reinforcement, the optimum hammer number in the filled site is 10 strike, and the optimum hammer number in the excavated site is 8 strike. The dynamic design of information construction(ie., the observational method) has to be used. After dynamic compaction, the bearing capacity of the eolian deposit fine sand is two times more than that before the dynamic compaction. In the collapsible test, the deformation increment of the eolian deposit fine sand is less with the time. The dynamic compaction method improves the collapsibility of the aeolian fine sand, among which the water is the main factor of controlling the collapsibility, and the dynamic compaction is the secondary factor. The research results help to provide reference for the design and construction of the foundation soil of eolian deposit fine sand by dynamic compaction, and provide reference for similar foundation treatment.

       

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