重载道路桥梁不均匀沉降施工技术优化研究

Research on Construction Technology Optimization of Differential Settlement of Heavy Load Road Bridge

公路及城市桥梁的超载运输会造成结构性破坏,承载能力降低,为此提出基于分层总和法的道路桥梁地基不均匀预测方法,运用土工合成材料加筋砂垫对公路桥梁建筑地基进行加固。地基不均匀沉降可概括为次固结沉降、固结沉降及瞬时沉降,采用分层总和法结合直线变形体理论,将桥梁地基层进行分层划分,分别计算出不同地基层变形量,以获取复合地基变形沉降量。实验结果表明,土工合成材料加筋砂垫层能够有效防止超载运输产生的地基沉降变形。

The overload transportation of highway and urban bridges will cause the structural damage and reduce the load - bearing capacity. Therefore, the prediction method for differential foundation of road bridge is put forward based on the layerwise summation method. The construction foundation of highway bridge is strengthened by utilizing reinforced sand blankets of geosynthetics. The differential settlement of foundation can be generalized into secondary consolidation settlement, consolidation settlement and immediate settlement. The layered division of bridge foundation layer is performed by adopting the layerwise summation method and straight line strained - body theory. The deformation of different foundation layers is calculated respectively, so as to obtain the deformation settlement of composite foundation. The experimental result shows that, the reinforced sand blankets of geosynthetics can effectively prevent the foundation settlement deformation caused by overload transportation.