| 昆明呈贡次生红黏土物理力学指标统计规律研究 |
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| 引用本文： | 高海艳,张家明.昆明呈贡次生红黏土物理力学指标统计规律研究[J].煤田地质与勘探,2021,49(5):174-181. |
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| 作者姓名： | 高海艳 张家明 |
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| 基金项目： | 国家自然科学基金项目41807258 |
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| 摘 要： | 为分析昆明呈贡次生红黏土物理力学指标的统计规律，以呈贡吴家营片区69个岩土工程勘察钻孔的275组次生红黏土试样的指标数据为研究对象，基于统计分析原理，运用SPSS统计分析软件，分析了13个指标的变化范围、平均值、标准差、变异系数及指标与深度的相关性，总结次生红黏土的物理力学特性，拟合指标间的线性经验公式，用偏斜度和峰值法检验指标的正态分布规律。结果表明:次生红黏土的土粒相对密度大，塑限和液限低，以可塑状态为主，压缩性高，抗剪强度低；指标与深度的相关性不高，力学指标的离散性比物理指标大，次生红黏土指标的离散性比原生红黏土大；指标间的相关性总体较弱，孔隙比、压缩系数、湿密度及内摩擦角与含水比呈负相关，压缩模量、黏聚力、湿密度及塑性指数与天然含水率呈正相关；仅湿密度、孔隙比和内摩擦角服从正态分布。研究结果为昆明呈贡地区岩土工程设计、土工参数的选取提供参考，为次生红黏土地区的工程防灾减灾提供基础依据。
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| 关 键 词： | 昆明呈贡地区 次生红黏土 物理力学指标 统计分析 相关关系 |
| 收稿时间： | 2021-04-02 |
Statistical regularity of physical and mechanical indexes of secondary red clay in Chenggong District,Kunming |
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| Abstract: | In order to analyze the statistical regularity of physical and mechanical indexes of secondary red clay in Chenggong District, Kunming, the index data of 275 groups of secondary red clay samples from 69 geotechnical investigation boreholes in Wujiaying area of Chenggong are taken as the research object. Based on the statistical analysis principle, the variation range, average value, standard deviation, coefficient of variation of 13 indexes and the correlation between indexes and depth are analyzed by SPSS statistical analysis software, and the physical and mechanical properties of secondary red clay are summarized. Then, the linear empirical formula between indexes is fitted, and the normal distribution regularity of indexes is tested by skewness and peak method. The results show that the secondary red clay has a large specific gravity of soil particle, low plastic limit and liquid limit, mainly in plastic state, high compressibility and low shear strength. The correlation between indexes and depth is not strong, and the discreteness of mechanical indexes is greater than that of physical indexes, while the index dispersion of secondary red clay is larger than that of primary red clay. The overall correlation between the indexes is weak, with the void ratio, compressibility and wet density, the internal friction angle and water content ratio negatively correlated, and the compression modulus, cohesion and wet density, the plasticity index and natural water content positively correlated. Only the wet density, void ratio and internal friction angle follow the normal distribution. The research results provide a reference for the geotechnical engineering design and the selection of geotechnical parameters in Chenggong District of Kunming, and offer a basis for the engineering disaster prevention and mitigation in the secondary red clay area. |
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