山区公路拓宽路基与衡重式挡土墙动态相互作用的数值模拟
发布时间：2018-11-28 12:06
【摘要】：针对山区公路路基拓宽改建的特殊性,运用非线性有限元法,开展衡重式挡土墙修建、新路基逐层分步填筑的动态施工力学行为数值模拟。针对新路基是否加筋、加筋层位以及衡重台上下方新路基填土压实状况的差异性,对新旧路基稳定安全性、滑动面形态、沉降、挡土墙变位等力学响应的影响开展参数敏感性分析。结合室内模拟墙体不同主动位移模式下拓宽路基土工离心模型试验成果,考察新旧路基顶面沉降与挡土墙变位的动态耦合关系。在山区公路路基拓宽改建动态施工中,挡土墙的变位和新旧路基顶面沉降、差异沉降相互耦合,呈正相关关系。衡重台下方新路基填土压实不足会导致新旧路基顶面差异沉降增大。挡土墙主动外倾诱发新旧路基顶面产生较大附加(差异)沉降,宜对新路基自重压密作用造成的差异沉降予以适当修正放大后进行上承路面结构设计。
[Abstract]:In view of the particularity of the widening and rebuilding of highway roadbed in mountainous area, the numerical simulation of dynamic construction mechanics behavior is carried out by using nonlinear finite element method to construct the retaining wall and fill the new roadbed step by step. In view of whether the new roadbed is reinforced, the difference of the reinforced layer and the compaction condition of the new roadbed under the balance platform, the stability and safety of the new subgrade, the form of sliding surface and the settlement of the new roadbed are discussed. Parameter sensitivity analysis was carried out on the influence of mechanical response such as displacement of retaining wall. The dynamic coupling relationship between the settlement of the new and old roadbed top surface and the displacement of retaining wall is investigated by combining the results of geo-centrifugal model test of widening roadbed with different active displacement modes of indoor simulated wall. In the dynamic construction of widening and rebuilding of highway roadbed in mountainous area, the displacement of retaining wall and the settlement of the new and old roadbed top surface are coupled with each other and have a positive correlation with each other. Insufficient compaction of the new embankment under the counterweight platform will increase the differential settlement of the new and old roadbed top surface. The active extroversion of retaining wall induces large additional (differential) settlement on the top surface of new and old subgrade. It is appropriate to modify and amplify the differential settlement caused by autoclave compaction of new subgrade and design the upper bearing pavement structure.
【作者单位】： 西南交通大学土木工程学院;西南交通大学道路工程四川省重点实验室;西南交通大学高速铁路线路工程教育部重点实验室;
【基金】：中央高校基本科研业务费专项资金资助(No.SWJTU12CX067);中央高校基本科研业务费专项资金资助(No.SWJTU12ZT05)
【分类号】：U418.8;U417.11
本文编号：2362781
[Abstract]:In view of the particularity of the widening and rebuilding of highway roadbed in mountainous area, the numerical simulation of dynamic construction mechanics behavior is carried out by using nonlinear finite element method to construct the retaining wall and fill the new roadbed step by step. In view of whether the new roadbed is reinforced, the difference of the reinforced layer and the compaction condition of the new roadbed under the balance platform, the stability and safety of the new subgrade, the form of sliding surface and the settlement of the new roadbed are discussed. Parameter sensitivity analysis was carried out on the influence of mechanical response such as displacement of retaining wall. The dynamic coupling relationship between the settlement of the new and old roadbed top surface and the displacement of retaining wall is investigated by combining the results of geo-centrifugal model test of widening roadbed with different active displacement modes of indoor simulated wall. In the dynamic construction of widening and rebuilding of highway roadbed in mountainous area, the displacement of retaining wall and the settlement of the new and old roadbed top surface are coupled with each other and have a positive correlation with each other. Insufficient compaction of the new embankment under the counterweight platform will increase the differential settlement of the new and old roadbed top surface. The active extroversion of retaining wall induces large additional (differential) settlement on the top surface of new and old subgrade. It is appropriate to modify and amplify the differential settlement caused by autoclave compaction of new subgrade and design the upper bearing pavement structure.
【作者单位】： 西南交通大学土木工程学院;西南交通大学道路工程四川省重点实验室;西南交通大学高速铁路线路工程教育部重点实验室;
【基金】：中央高校基本科研业务费专项资金资助(No.SWJTU12CX067);中央高校基本科研业务费专项资金资助(No.SWJTU12ZT05)
【分类号】：U418.8;U417.11
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