真空降水堆载联合预压加固高速公路桥坡软基技术研究

Study of technology of soft subsoil under freeway bridge embankment by the combined-preloading of vacuum dewatering and loading

从应力路径的观点 ,探讨了真空降水堆载联合预压法加固高速公路桥坡深厚软弱地基的加固机理 ;从简单、实用的角度 ,提出了该法的沉降计算方法和设计原理 ;并结合实际工程 ,分析了该法对加速地基土在施工期间的固结过程。

From the view of stress path, authors discuss the mechanism on improving deep soft ground of freeway bridge embankment by the combined preloading of vacuum dewatering and loading. For simplicity and practicality, the calculation method of settlement and the design principle have been put forward.Based on a practical engineering, authors have analyzed the function and contribution of this method for accelerating consolidation, reducing after work settlement, and decreasing longitudinal gradient variation ratio.