真空联合堆载预压加固海相软基的环境效应研究

Environmental effect on marine soft subgrade strengthened by vacuum-surcharge preloading method

针对真空堆载联合预压技术加固海相软土地基理论研究落后于工程实践的问题,结合现场监测数据,对真空联合堆载预压加固海相软土路基过程的地表沉降、环境效应随时间的变化规律进行分析。结果表明:真空联合堆载预压能加快地基沉降的速率,缩短施工工期;抽真空时,土体内向变形主要发生在地表下2 m范围内;堆载时,加固土体更易向加固区外软土区域产生侧向挤出变形,水平土体环境影响范围超过8 m。

In view that the theoretical research on the vacuum-surcharging preloading technique for reinforcing marine soft soil subgrade is lagged behind the engineering practice,we analyze the variation law of the surface settlement and environmental effect in the process of strengthening of marine soft soil subgrade by the vacuum-surcharging preloading method,which is based on the field monitoring data.The results show that the vacuum-surcharging preloading treatment can speed up the rate of foundation settlement and shorten the construction period;inward lateral displacements chiefly occur at 2 m below the ground during the vacuum preloading stage;the reinforced soil more easily to produce the lateral extrusion deformation outside the reinforcement area during the preloading stage and the horizontal soil environmental influence scope is more than 8 m.