Settlement deformation properties and construction control depth of rock heap subgrade in highway

Based on the Shuifu-Maliuwan highway project, the physical and mechanical parameters are gained by field tests and centrifugal models with different typical sections are established. The settlement deformation of rock heap subgrade is analyzed under the gravity and automobile load. The simulation for the settlement of different types of rock heap subgrade is finished by use of the finite element method. If the natural rock heap subgrade is not effective, it must be dealt with. Through the analysis of the simulation of different disposal methods, the best disposal project is proposed. Based on the results of the model tests and numerical simulation, the control methods of the settlement and stability of the rock heap subgrade are studied. Taking the lime soil filling for an ensample, the construction control depth is analyzed, and the control index of replacement depth for the rock heap subgrade is put forward.