里下河泻湖相软土土性参数变异性统计分析

Statistical Analysis of the Variability of Engineering Characteristics of Soft Soil in the Lixiahe Area

土是自然界的产物,受沉积过程、沉积条件、沉积环境等因素影响,土性参数具有变异性,导致由勘探取样点处获得的各项指标参数无法描述大范围土层的工程特性。依托江苏里下河地区建兴高速和东兴高速建设工程,应用随机场理论对该地区泻湖相软土的土性参数变异性进行概率统计分析,并总结了国内其他地区软土力学指标和变形指标的变异性统计成果。分析表明里下河泻湖相软土物理性质指标变异性低,力学性质指标和变形性质指标变异性相对较高,且沿深度方向有明显的趋势分量,趋势分量对变异性影响较大,去除趋势分量后可将变异系数降低一半左右。

Soil is a product of nature,and influenced by factors such as sedimentation process,sedimentation conditions,and sedimentation environment.The engineering characteristic parameters of soils have variability,resulting in various indicator parameters obtained from the exploration sampling points being unable to describe the engineering characteristics of the soil layer within the scope.Based on the expressway construction project in Lixiahe area,this paper uses the random field theory to conduct the probability statistical analysis on the variability of engineering characteristic parameters of the lagoon soft soils in this area and summarizes the statistical results of variability of mechanical indexes and deformation indexes of soft soil in other regions in China.The analysis shows that the variability of physical properties indicators of soft soil in the Lixia River lagoon phase is low,while the variability of the mechanical and deformation properties indicators is relatively high.There is an obvious trend component along the depth direction,which has a significant impact on variability.After removing the trend component,the coefficient of variation can be reduced by about half.