南海迭层土物理力学特性的研究

发布时间：2018-06-25 06:24

本文选题：迭层土 + 不排水强度　；参考：《岩土力学》2014年S1期

【摘要】：我国海域普遍分布有迭层土,由于结构的特殊性,对于其性质的准确把握,直接影响到海洋工程诸如打桩、钻井船插深等问题预测的准确性,关系到海洋工程建设的安全。现场进行孔压静力触探CPTU试验以及室内试验,分析我国南海海域迭层土的物理、力学性质的特点,对迭层土抗剪强度值的确定进行探讨。CPTU试验数据显示,迭层土的物理力学性质与单一土层具有较明显的差异;由于迭层土中砂层的存在,室内三轴不排水剪切试验(UU试验)确定的不排水强度明显偏低,是CPTU确定的不排水抗剪强度的下限值。CPTU的结果可以较好地反映了迭层土的特点,根据CPTU试验结果得到的摩阻比变化范围较大,在0~8之间远大于一般的砂土或黏土的变化范围,摩阻比与修正端阻之间的关系可用双曲线近似表示。建议进行静力分析时,迭层土不排水抗剪强度参数选取应参考CPTU试验结果。
[Abstract]:In the sea area of China, superposition soil is widely distributed. Due to the particularity of the structure, the accurate grasp of its properties has a direct influence on the accuracy of ocean engineering, such as pile driving, drilling ship depth and so on. It is related to the safety of marine engineering construction. The field pressure static penetration CPTU test and indoor test are carried out on the site to analyze the superposition of the sea area in the South China Sea. .CPTU test data show that the physical and mechanical properties of superposition soil have obvious differences with the single soil layer. Because of the existence of sand layer in the superposition soil, the undrained strength of the three axis undrained shear test (UU test) is obviously lower than that of CP. It is CP The results of the lower limit value.CPTU of the undrained shear strength determined by TU can better reflect the characteristics of the superposition soil. The variation range of the friction ratio obtained by the CPTU test results is larger than that of the ordinary sand or clay. The relationship between the friction ratio and the modified end resistance can be approximated by the hyperbolic curve. In the static analysis, the CPTU test results should be referred to the selection of undrained shear strength parameters for laminated soil.
【作者单位】：天津大学建筑工程学院;中海油服物探事业部;
【分类号】：TU43

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