The Application And Researching Of Reinforced Soil Steep Slope In Highway Subgrade Widening Engineering

The reinforced soil steep slope structure is widely used in engineering practice because of its low bearing capacity,saving land,eco-environmental protection,economic security and so on.In order to improve the current situation of low capacity of expressway in our country,the widening structure of roadbed is widely used in our country at present in the form of natural fill sloping and widening structure,which puts forward higher requirements for controlling the uneven settlement of new and old roadbed under the condition of increasing the occupation area.The main contents of this paper are as follows:(1)The structure and structural characteristics of the reinforced soil steep slope are introduced,and the calculation method of structural stability of the general reinforced soil slope is summarized.(2)The shear strength of reinforced earth filler and the effect of interface between geogrid and filler are analyzed by laboratory test.(3)This paper introduces the construction technology of the reinforced soil structure in the roadbed widening project,selects four sections of reinforced soil structure and one section of natural sloping structure,monitors the settlement of the cross-section of foundation and the strain of steel bars,and predicts the potential sliding surface,and analyzes the variation law of data after collecting the construction period and operation.(4)Based on the field test of xinyuan expressway reconstruction and extension,the numerical simulation of flac3 d was carried out to analyze the variation law of cross section settlement,vertical and horizontal displacement and shear strain increment of reinforced soil steep slope subgrade in roadbed widening project,and the numerical simulation results were compared with the measured values.Finally,the widening effect of different subgrade forms is compared and analyzed.This paper studies the state of the roadbed structure in the widening of the steep slope of reinforced soil and summarizes its deformation law and key techniques and control methods in the construction process and in the early stage of operation.