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摘要: 为了解长江下游苏通公路大桥地基土工程特性, 基于大量的室内土工试验和回归分析方法, 研究了水下地基粘性土的变形参数和强度参数特性。发现粘性土的变形参数和强度参数的变异系数比物理参数的变异系数大; 压缩模量与天然孔隙比、天然含水量、干密度等物理参数成指数关系, 相关系数大于0.87;压缩系数与3个物理参数成线性关系, 相关系数超过0.91;粘聚力与3个物理参数成较好的指数关系, 相关系数大于0.84, 而内摩擦角与物理参数间的相关关系差, 线性相关系数小于0.41。Abstract: In order to understand the engineering properties of cohesive clay in the foundation of Sutong highway large bridge in the lower reaches of Yangtze River, the deformation and strength parameters were studied based on a large number of geotechnical tests and regression analysis method.Study result shows that the variation coefficients of deformation and strength parameters for cohesive clay are larger than those of physical parameters; there is good exponential correlativity between compression module and three physical parameters that are natural pore-solid ratio, natural water content and dry density, the correlativity coefficients are more than 0.87;there is linear correlativity between compression coefficient and three physical parameters, the correlativity coefficients are more than 0.91;there is better exponential correlativity between cohesion and three physical parameters, their correlativity coefficients are more than 0.84;while the correlativity between internal friction angle and three physical parameters is bad, their linear correlativity coefficients are less than 0.41.
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Key words:
- cohesive clay /
- experimental study /
- deformation parameters /
- strength parameters
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图 2 压缩模量与物理参数关系
Figure 2. Relationship between compression module and physical parameters
图 3 压缩系数与物理参数关系
Figure 3. Relationship between compression coefficient and physical parameters
图 5 内摩擦角与物理参数关系
Figure 5. Relationship between internal friction angle and physical parameters
表 1 参数统计
Table 1. Statistic of parameters
物理力学指标 粘土 粉质粘土 范围 平均值 变异系数 范围 平均值 变异系数 天然含水量/% 25.3~39.5 33.4 0.10 18.3~39.5 34.3 0.08 天然密度/(g·cm-3) 1.79~1.99 2.08 0.02 1.79~2.08 1.82 0.02 天然孔隙比 0.517~1.092 0.628 0.05 0.529~1.108 1.004 0.08 压缩系数/MPa-1 0.06~0.54 0.18 0.12 0.08~0.54 0.36 0.24 压缩模量/MPa 9.49~29.10 14.52 0.14 3.83~21.52 5.82 0.22 粘聚力/kPa 10~165 45 0.15 10~126 39 0.31 内摩擦角/(°) 8.2~28.8 17.4 0.21 7.2~29.4 19.0 0.32 
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