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地裂缝地质灾害一直以来对工程的建设都产生严重的影响。以大西高速铁路为例,选择具有代表性的地裂缝,在现场进行了大量的调查工作,获得了必要的计算参数,进而建立高速铁路桥梁段穿越地裂缝的数值模型。利用Flac3D数值软件进行计算,模型使高速铁路45°穿越地裂缝,通过强制位移控制地裂缝及上盘的活动大小。通过计算地裂缝及上盘下降5、10、20、30、40 cm的5种工况,分析桥梁的变形及桩基的受力特征,得出地裂缝活动对桥梁影响的规律。
Ground fissures and geological disasters have always had a serious impact on the construction of the project. Taking the high-speed railway as an example, a large number of ground fissures were selected to carry out a large number of surveys in the field. The necessary calculation parameters were obtained, and then a numerical model of ground fissures in high-speed railway bridges was established. Using the software Flac3D, the model makes the high-speed railway pass through the ground fissure at 45 °, and controls the size of the ground fissures and the upper plate through forced displacement. Through the calculation of ground fissures and 5, 10, 20, 30 and 40 cm of 5 kinds of working conditions, the deformation of the bridge and the stress characteristics of the pile foundation are analyzed, and the influence of the ground fissure on the bridge is obtained.