论文部分内容阅读
为了研究季冻区湿地软土地基的固结变形特性及其影响因素,在提出季冻区湿地软土地基现场监测方案的基础上,对路堤填土荷载作用下软土地基固结变形特性和加载条件、软土地基处理方法、地层条件、温度变化、时间效应等的相关性进行分析研究。监测结果证明:虽然湿地软土层不厚,但软土的沉降量占全部沉降量的80%以上,在整个冬季,负温对软土地基的固结沉降有一定的影响,主要表现在中央分隔带和路肩软土地基的沉降过程出现一定的差异;软土地基的侧向位移基本上是随荷载的增加而增大,最大位移深度随软土层厚度的增加而增大,冬季软土地基冻结的过程中,在冻结深度范围内软土地基出现反向的侧向位移;整个冬季软土地基孔隙水压力均有不同程度的消散,根据沉降和孔隙水压力监测结果得出,袋装砂井更适合于季冻区湿地软土地基的工程治理措施;试验段冻结深度随时间的变化,最大冻深小于2.8m,在一月底至二月初期间;路堤填土冻结的过程中,靠近中央分隔带处的土压力逐渐减小,而靠近路堤边坡处的土压力逐渐增大。研究成果可为季冻区湿地软土地基固结沉降分析计算及设计提供参考依据。
In order to study the consolidation and deformation characteristics of wetland soft soil foundation in seasonal frozen area and its influencing factors, based on the field monitoring program of wetland soft soil foundation in seasonal frozen area, the consolidation and deformation characteristics of soft soil foundation under embankment fill load and Loading conditions, treatment methods of soft ground, formation conditions, temperature changes, time effects and other related analysis. The monitoring results show that although the soft soil layer in the wetland is not thick, the settlement of the soft soil accounts for more than 80% of the total settlement. During the winter, the negative temperature has a certain influence on the consolidation and settlement of the soft soil foundation, mainly in the central The settlement process of the soft soil foundation along the separation zone and the road shoulder shows some differences. The lateral displacement of the soft soil foundation increases with the increase of the load basically, and the maximum displacement depth increases with the increase of the soft soil layer thickness. In the course of foundation freezing, the lateral displacement of soft ground appears in the frozen depth range. The pore water pressure of the soft soil foundation dissipates to varying degrees throughout the winter. According to the settlement and pore water pressure monitoring results, The sand well is more suitable for engineering treatment of wetland soft ground in seasonal frozen area. The freezing depth of the experimental section changes with time, the maximum frozen depth is less than 2.8m. During the period from the end of January to the beginning of February, The earth pressure at the central divider zone gradually decreases while the earth pressure near the embankment slope gradually increases. The research results can provide reference for the analysis and calculation of consolidation settlement of wetland soft ground in seasonal frozen area.