基质吸力对全风化花岗岩抗剪强度的影响研究
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1.中国海洋大学环境科学与工程学院;2.青岛地质工程勘察院;3.青岛市勘察测绘研究院崂山分院

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P642

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自然资源部滨海城市地下空间地质安全重点实验室开放基金(BHKF2021Z11);


Study on the influence of matrix suction on the shear strength of fully weathered granite
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College of Environmental Science and Engineering,Ocean University of China

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    摘要:

    饱和度的变化只是引起全风化花岗岩土体抗剪强度变化的外在宏观表现,而基质吸力的变化才是造成岩土体抗剪强度变化的关键因素。为了研究基质吸力对全风化的花岗岩的抗剪强度的影响,为实际边坡和堤坝工程提供数据参考,通过采用离心法进行试验研究,运用VG模型对实验数据进行拟合,研究了不同级配、不同含水率下的全风化花岗岩的基质吸力,得到了不同级配条件下的全风化花岗岩的水土特征曲线(SWCC),在测定水土特征曲线后,通过直剪试验,对不同饱和度的全风化花岗岩的抗剪强度进行测定。结果表明,全风化花岗岩土体的饱和度与基质吸力呈负相关的趋势;级配较不均匀的土样,排水能力较强。全风化花岗岩土体抗剪强度指标受基质吸力的影响不同,粘聚力对基质吸力的变化相对于内摩擦角而言更加敏感。经过扫描电镜试验可以分析出,土样中孔隙度是影响基质吸力的因素之一,全风化花岗岩土样在饱和度达到一定程度时,会产生胶结物填充到孔隙中,使排出水分所需要的基质吸力增大;全风化花岗岩土体中基质吸力与抗剪强度呈现正相关的关系,基质吸力越大,表现出的抗剪能力越强。

    Abstract:

    :The change of saturation is only the external macroscopic expression of the change of shear strength of completely weathered granite soil, while the change of matrix suction is the key factor of the change of shear strength of rock and soil mass. In order to study the influence of matrix suction on the shear strength of fully weathered granite and provide data reference for actual slope and dam projects, the centrifugal method was used to conduct experimental research, and the VG model was used to fit the experimental data to study the matrix suction of fully weathered granite with different levels of composition and different water content. The soil and water characteristic curves (SWCC) of weathered granite with different levels of composition were obtained. The shear strength of weathered granite with different saturation was determined by direct shear test. The results show that the saturation of the completely weathered granite soil is negatively correlated with the matric suction. Soil samples with less uniform gradation have better drainage capacity. The influence of matric suction on the shear strength of completely weathered granite soils is different, and the cohesion is more sensitive to the change of matric suction than the internal friction Angle. The scanning electron microscope analysis shows that the porosity of soil samples is one of the factors affecting the matrix suction. When the saturation of the weathered granite soil samples reaches a certain degree, cement will be generated to fill the pores, which increases the matrix suction required for water discharge. There is a positive correlation between the matrix suction and the shear strength in the weathered granite soil. The greater the matrix suction is, the stronger the shear strength is.

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王志朋,刘红军,武闻禹,等. 基质吸力对全风化花岗岩抗剪强度的影响研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-09
  • 最后修改日期:2024-06-02
  • 录用日期:2024-06-05
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