排水板堆载预压处理软土路基原位观测试验

摘要

以某毗邻长江城市新建路堤结合的滨江大道为工程背景,选取500 m典型路基段为试验段,采用排水固结的方法(塑料排水板+堆载预压)处理软土路基,通过对试验段的原位观测,包括沉降板(垂直沉降观测)和测斜管(测斜位移观测),验证设计方案的合理性,提出进一步保障新建软土路基施工质量的监控量测措施.通过原位观测试验表明:填土速率对软基沉降和侧移速率影响较大,其中侧移主要发生在地层中的淤泥质黏土层;老堤和新填路基之间存在一定的沉降和侧移差异,但不会影响既有堤防的防洪功能.%In the engineering background of a new road-embankment integrating Avenue in a city adjacent the Yangtze River, soft soil roadbed was treated by drainage consolidation method (Plastic Drainage Slab and Surcharge Preloading). A 500 meters long avenue with typical subgrade section was selected as the test section. The rationality of the design scheme was verified by in-situ observation on test section, which included using settlement plate to monitor vertical settlement and using inclinometer tube to monitor horizontal settlement. Then, the measures to control the construction quality of the new soft soil subgrade were put forward. In-situ observation test shows that: Filling rate has great influence on settlement and lateral displacement rate, and lateral displacement mainly appears in mucky clay layer. There exists certain settlement and lateral displacement differences between old embankment and new Roadbed, which would not influence flood control function of embankment.