The micro-pile of Qingdao-Yinchuan Expressway K555+070-K557+710 was used to control the uneven settlement of the embankment. The earth pressure was monitored by site-placed pressure box, subgrade deformation was calculated, and Midas/GTS was used to establish the subgrade filling and operation model. The model is divided into three phases: completion, operation period and post-treatment analysis. By comparing and analyzing the numerical simulation results and the actual monitoring data, it is found that the differential pile settlement of the subgrade by the micro piles can effectively control the vertical settlement and horizontal displacement, and greatly improve the stability of the subgrade. The effect of micro piles on uneven settlement is obvious, and the optimal vertical pile spacing is 3m. Provide reference for similar projects.
Papers Presented at the 2018 37th Southern African Transport Conference 9-12 July 2018 Pretoria, South Africa. Theme "Towards a desired transport future: safe, sufficient and affordable".