公路新建和扩建全过程力学响应数值分析

发布时间：2018-03-23 16:13

本文选题：公路拓宽　切入点：差异沉降　出处：《地下空间与工程学报》2014年06期

【摘要】：考虑公路扩建工程中新、老路修建历史的差异,建立了软土地区公路新建和扩建全过程力学响应分析的平面非线性有限元模型。对新、老路软基未加固和搅拌桩加固的4种地基加固方式下新、老路面对差异沉降的力学响应进行了数值模拟分析。计算结果表明,拓宽前老路基顶面沉降呈"盆形"分布。新路基荷载下老路中心处发生回弹。老路软基搅拌桩加固时老路基顶面沉降由"盆形"分布逐渐发展为"倒钟形"分布。新、老路软基均未加固时面层顶部的最大水平拉应力最大,新、老路软基均搅拌桩加固时面层顶部的最大水平拉应力最小。老路软基搅拌桩加固时新路面层顶部受拉,其余3种地基加固方式下新路面层顶部受压。
[Abstract]:Considering the historical difference between new and old road construction in highway expansion project, a plane nonlinear finite element model for mechanical response analysis of highway construction and expansion in soft soil area is established. The numerical simulation analysis of the mechanical response of the old road to the differential settlement is carried out under the four kinds of reinforcement methods of the old road soft foundation without strengthening and the mixing pile strengthening. The results show that, The settlement of the top surface of the old roadbed before widening is "basin" distribution. The springback occurs at the center of the old road under the new roadbed load. The settlement of the top surface of the old roadbed gradually develops from "basin shape" to "inverted bell shape" when the old road is strengthened by mixing piles with soft foundation. The maximum horizontal tensile stress at the top of the surface layer is the largest and new when the soft foundation of the old road is not strengthened, and the maximum horizontal tensile stress at the top of the surface layer is the least when the soft foundation of the old road is strengthened by mixing piles. The top of the surface layer of the new road is compressed under the other three kinds of foundation strengthening methods.
【作者单位】：上海理工大学土木系;上海地矿工程勘察有限公司;
【基金】：广东省交通科技重点项目(200502)
【分类号】：U416.1

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