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The consolidation behavior of mixed in place cement- and lime/cement-mixed column was studied. Consolidation of the composite
foundation was modeled as a three-dimensional axi-symmetric problem. The authors used the finite difference method to obtain
the pore pressure variation with time at any location below the surface. A computer program developed by the authors was used
to draw some interesting conclusions about the consolidation behaviors of cement- and lime/cement-mixed pile foundation. Finally,
a combined model including the permeability coefficients of cement-mixed piles and soil, was studied and its feasibility was
evaluated.
Project supported by National Natural Science Foundation of China (No. 59908012) and Education Ministry of China 相似文献
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Biot's dynamic consolidation equations and Hankel transform were used to derive the integral solutions of stress and displacement for axisymmetric harmonic excitations in the two-phase saturated soil with subjacent rock-stratum. The influence of the coefficient of permeability and loading frequency on the soil displacement at the ground surface were studied. The results showed that higher loading frequency led to more dynamic characteristics; and that the effect of the soil permeability was more obvious at higher frequencies. 相似文献
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目前对隧道变形缝合理间距的问题,缺乏定量的分析。通过变形缝设置现状的调研和分析整理可知,土层的变化、内外的温差以及隧道结构的突变是变形缝设置的主要影响因素。变形缝的合理设置对隧道结构的安全性和隧道防水都有着重要影响,本文依托南昌艾溪湖湖中明挖段,建立隧道三维结构模型,对变形缝设置的主要影响因素进行了分析,对隧道的变形缝设置的间距进行数值模拟和优化。结果表明:变形缝能够改善隧道应力的分布,但是过多的变形缝给隧道的防水工作增加了难度,通过控制合理的间距以较少变形缝的设置成为研究的重点。在原设置间距60 m的基础上,确定变形缝的间距设置为80 m和100 m,该设置能够满足结构轴向应力、竖向变形以及止水带剪切应力的要求。文中得到的结论可为设计和施工提供理论依据和参考,对于工程具有较好的实用价值和理论意义。 相似文献
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Stable response of axisymmetric two-phase water-saturated soil 总被引：1，自引：0，他引：1
Biot's dynamic consolidation equations and Hankel transform were used to derive the integral solutions of stress and displacement for axisymmetric harmonic excitations in the two-phase saturated soil with subjacent rock-stratum. The influence of the coefficient of permeability and loading frequency on the soil displacement at the ground surface were studied. The results showed that higher loading frequency led to more dynamic characteristics; and that the effect of the soil permeability was more obvious at higher frequencies. 相似文献
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对颗粒材料动力特性的研究发现,颗粒材料具有明显色散特性,因而确定不同激励频率下颗粒材料介质中波速的变化对研究颗粒材料动力特性具有重要意义。设计了教学实验,将使用GDS三轴系统结合弯曲元测试系统,测定一定围压下颗粒材料(以玻璃珠为例)剪切波速随激励频率的变化规律。该实验目的明确,通过该实验学生能够掌握GDS三轴试验中颗粒材料的制样、弯曲元系统的操作及确定颗粒材料中波速随频率变化的测定方法。有利于培养学生的动手能力、科研意识及团队协作的能力,为以后的学习和工作打下坚实的基础。 相似文献
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