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为研究长江三角洲区域性软土路基的沉降特点,对长三角地区滨海相软土的沉积环境、地层分布特点和工程特性进行了系统分析。基于研究区内典型软土地段高速公路软基沉降的观测数据,研究了该地区软基沉降的变化规律,分析了场地工程地质条件和填土高度等因素对软土路基沉降的影响。结果表明:长三角地区海相软土地层与陆相地层相互交叠,海相软土具有高压缩性、低强度和较强的结构性;软基沉降曲线有3种类型,沉降量随硬壳层厚度减小、软土层厚度增加而增加,不同软土路基处理路段的沉降特点具有显著差异。
In order to study the settlement characteristics of the regional soft soil subgrade in the Yangtze River Delta, the sedimentary environment, stratigraphic distribution and engineering characteristics of the coastal soft clay in the Yangtze River Delta are systematically analyzed. Based on the observation data of settlement of soft ground in expressway with soft soil in the study area, the variation regularity of soft ground settlement in this area is studied. The influence of site engineering geological conditions and filling height on the settlement of soft soil roadbed is analyzed. The results show that the marine soft soil strata and continental strata overlap each other in the Yangtze River Delta, and the soft clay in the soft clay has high compressibility, low strength and strong structural properties. There are three types of soft soil settlement curves, The thickness of the shell decreases, while the thickness of the soft soil layer increases, the settlement characteristics of the road sections with different soft soil subgrade have significant differences.