张艳美, 程志良, 万丽丽, 吴文涛, 刘笑. 2018: 黄河三角洲饱和粉质土液化性能试验研究. 工程地质学报, 26(2): 451-458. DOI: 10.13544/j.cnki.jeg.2015-566
    引用本文: 张艳美, 程志良, 万丽丽, 吴文涛, 刘笑. 2018: 黄河三角洲饱和粉质土液化性能试验研究. 工程地质学报, 26(2): 451-458. DOI: 10.13544/j.cnki.jeg.2015-566
    ZHANG Yanmei, CHENG Zhiliang, WAN Lili, WU Wentao, LIU Xiao. 2018: EXPERIMENTAL STUDY ON LIQUEFACTION CHARACTERISTICS OF SATURATED SILTY SOIL AT YELLOW RIVER DELTA. JOURNAL OF ENGINEERING GEOLOGY, 26(2): 451-458. DOI: 10.13544/j.cnki.jeg.2015-566
    Citation: ZHANG Yanmei, CHENG Zhiliang, WAN Lili, WU Wentao, LIU Xiao. 2018: EXPERIMENTAL STUDY ON LIQUEFACTION CHARACTERISTICS OF SATURATED SILTY SOIL AT YELLOW RIVER DELTA. JOURNAL OF ENGINEERING GEOLOGY, 26(2): 451-458. DOI: 10.13544/j.cnki.jeg.2015-566

    黄河三角洲饱和粉质土液化性能试验研究

    EXPERIMENTAL STUDY ON LIQUEFACTION CHARACTERISTICS OF SATURATED SILTY SOIL AT YELLOW RIVER DELTA

    • 摘要: 在黏粒含量和干密度恒定的情况下,进行了一系列重塑黄河三角洲饱和粉质土不排水动三轴试验,试样直径为50 mm、高为100 mm,重点研究了有效围压、动荷载和粉粒含量等因素对饱和粉质土液化特性的影响。试验结果表明:(1)在粉粒含量不小于50%的情况下,粉粒含量的增加降低了黄河三角洲饱和粉质土的液化势;(2)重塑黄河三角洲饱和粉质土的动强度随有效围压的增大而增大,与初次液化振动次数的对数近似呈线性关系;(3)与砂土相比,粉质土的动孔压很难达到有效围压,并且随有效围压的增大,相同条件下动孔压达到有效围压的比率降低;随粉粒含量的增加,其对动孔压的影响有减小的趋势;粉粒含量的增大减缓了动孔压的增长;(4)根据本次试验结果,给出了重塑黄河三角洲饱和粉质土的动孔压计算模型及相关参数取值。

       

      Abstract: This paper studies the influence of effective confining pressure, dynamic load and silt content on liquefaction characteristics of the remolded saturated silty soil at Yellow River delta. It carries out a series of undrained dynamic triaxial tests using the constant clay content and dry density approach. These tests are conducted on specimens of size 50 mm diameter and 100 mm height. The results show that:(1)Under the condition of the silt content not less than 50%, the increase of silt content reduces the liquefaction potential of the remolded saturated silty soil. (2)The dynamic strength of the remolded saturated silty soil increases along with the effective confining pressure increasing, and it shows an approximate linear relationship with the logarithm of the initial liquefaction vibration number. (3)Compared with sandy soil, the dynamic pore pressure of silty soil is difficult to achieve the effective confining pressure. With the increase of effective confining pressure, the ratio of dynamic pore pressure to the effective confining pressure decreases. With the increase of silt content, the influence of silt content on the dynamic pore pressure decreases. The increase of silt content slows down the growth of dynamic pore pressure. (4)According to the experimental results, a dynamic pore pressure calculation model and related parameters of the remolded saturated silty soil is proposed.

       

    /

    返回文章
    返回