北戴河新区粉质黏土物理力学性质研究

Study on the physical and hydraulic properties of powder clay and foundation carrying capacity in Beidaihe New Area

为了研究北戴河新区地基土物理力学特性以及承载性能,为工程设计提供有价值的参数。鉴于北戴河新区地基土分布主要为粉质黏土的特殊性,采用现场原位试验、室内土工试验以及理论分析等方法,研究了粉质黏土的物理力学性质,分析各指标间的相关性并拟合了的回归方程。为北戴河新区岩土工程勘察和设计提供了可靠的基础数据。得出的主要结论如下:除压缩强度指标随深度的变化呈较为规律性的变化外,北戴河新区粉质黏土的物理力学性质与土层深度无关,总体呈正态分布。物理指标变异性低,范围变化较小,孔隙比、饱和度较高;力学指标变异性大,范围变化大,变异系数较高。北戴河新区粉质黏土物理指标间的相关性较为显著,力学指标与物理指标间的相关性较差,但是黏聚力与含水率、孔隙比间的相关性尤为显著。

In order to study the physical and mechanical properties and carrying performance of the foundation soil in Beidaihe New Area, it provides valuable parameters for engineering design. In view of the particularity of the distribution of the foundation soil in Beidaihe New Area, the physical and mechanic properties of powder clay were studied, the correlation between the indicators and the fitted regression equation were studied by field in situ test, indoor geotechnical test and theoretical analysis. It provides reliable basic data for the survey and design of geotechnical engineering in Beidaihe New Area. The main conclusions are as follows: In addition to the compression strength index with the change of depth of the more regular changes, beidaihe New Area powder clay physical and mechanics properties are independent of the depth of the soil layer, the overall normal distribution. The variability of physical index is low, the range change is small, and the pore ratio and saturation are high. Mechanics indicators have large variability, large range changes and high coefficients of variation. The correlation between powder clay physical index in Beidaihe New Area is more significant, and the correlation between mechanics index and physical index is poor, but the correlation between adhesion and water content and pore ratio is particularly significant.