地面沉降对高速铁路桥梁工程的影响及对策

The Influence of Land Subsidence on the Bridge of High-speed Railway and Its Engineering Countermeasures

研究目的:研究地面沉降在不同区域及不同发展阶段对不同结构类型桥梁的影响,提出适宜的防治对策与工程措施,供高速铁路勘测、设计及施工参考。研究结论:在抽水井附近及地面沉降的中心区域,不均匀沉降较为严重,对桥梁结构变形影响较大;在地面沉降的扩展区域内,地面沉降引起地层和桥体变形主要是竖向变形,虽然下沉量相对较大,但对桥梁结构变形的影响却不大;在地面沉降区内,表现为平缓的下沉,对高速铁路桥梁工程影响不大,但局部地段出现差异沉降较大的地段。因此在铁路工程建设中应合理选址,优化桥梁布置及结构形式,优先采用简支结构,并采取适宜的工程措施来增强铁路工程本身对地面沉降的适应性。

Research purposes： The study is done on the influences of land subsidences on the bridges of high - speed railway at different stages in different areas and the preventive and engineering rmeasures for subsidence are presented for the purpose of providing reference to survey, design and construction of high - speed railway. Research conclusions： In the central area of land subsidence and vicinity of the pumping well, the uneven subsidence is more serious, which much influences the bridge structure. In the extended area of land subsidence, the deformations of strata and bridge caused by land subsidence are longitudinal ones with large subsidence volume, but which has little influence on the bridge structure. In the area of land subsidence, the subsidence happens slowly, which has a little influence on the construction of bridge, but the large subsidence may happen in some places, so it is necessary to select bridge site rationally, optimize the layout and structure type of bridge, adopt simply - supported structure and take the engineering measures to enhance the bridge capacity against the subsidence.