高速公路软土路基沉降及处治数值分析

基于土体固结理论,采用ABAQUS有限元软件对某跨越软土地区的新建高速公路路基沉降量及差异沉降进行分析,并对该工程中采用粉喷桩加固软土地基的处治效果进行了验算。数值模拟计算表明:未经处治的软土地基,随着路堤与路面结构逐渐修筑完成,路基的沉降量随着填土的增加逐渐增加,且初始沉降速率大于后期沉降速率,该路面竣工15 a后,路面表面的差异沉降达到2.2 cm,需对软土地基进行处治以满足道路后期使用性能;在软土地基中采用竖向粉喷桩进行地基加固后,路表面各点的沉降量显著降低,各点处的差异沉降量极小,几乎可忽略不计,表明增设粉喷桩群后,软土地基的强度与刚度得到了显著的提高,有效控制了路基的差异沉降。

Numerical Analysis of Settlement and Treatment of Soft Soil Subgrade Under Highway

In order to provide a theoretical research method for the study of soft soil subgrade settlement of highway ,the settlement and differential settlement of a new highway subgrade crossing a soft soil area are analyzed by using the ABAQUS finite element software based on the soil consolidation theory ,and the engineering adopted in pile reinforcement of soft soil foundation treatment effect is checked .Numerical simulation results show that with the construction of em-bankment and pavement structure ,the settlement of subgrade increases with the soil fill .And the initial settlement rate is greater than the latter settlement rate .15 years after completion of the road ,the differential settlement of the surface of the road reaches 2 .2 cm ,and the soft soil foundation should be treated to meet the late service performance of the road ;In soft soil foundation with vertical pile foundation reinforcement ,settlement of road surface points was significantly re-duced ,the difference of each point of the settlement is small ,almost negligible ,adding that pile group ,the soft soil foundation stiffness and strength has been greatly improved ,which effectively control the subgrade settlement difference .