超大型深基坑对高速铁路桥墩稳定性影响分析

发布时间：2018-03-03 03:18

本文选题：高速铁路　切入点：深基坑　出处：《铁道标准设计》2014年07期 　论文类型：期刊论文

【摘要】：随着近邻高速铁路沿线房地产的开发,建筑基坑施工有可能影响到高速铁路桥梁、路基的稳定性,为了减小基坑开挖产生的不利影响,确保高速铁路行车安全,通过大型有限元软件计算以及现场位移、水位等实时检测手段进行稳定性分析,同时,研究了深基坑开挖及抽水过程对高速铁路桥梁桩基变形的影响规律及范围。结果显示,基坑自身的稳定性及其降水后的水位位置,对高速铁路桥梁桥墩的水平位移有着重要影响,且这种影响关系是复杂的,影响范围较大,因此,不能仅以基坑与高速铁路的距离是否在20m以上作为安全标准,而应根据基坑深度、大小以及需要降水的程度,结合其与高速铁路距离、地层土质力学参数等因素,综合评价其对高速铁路的影响。
[Abstract]:With the development of real estate along the adjacent high-speed railway, the construction of foundation pit may affect the stability of high-speed railway bridge and roadbed. In order to reduce the adverse effect of excavation of foundation pit and ensure the safety of high-speed railway, The stability analysis is carried out through the calculation of large-scale finite element software and real-time detection of field displacement and water level. At the same time, the influence of excavation and pumping process of deep foundation pit on pile foundation deformation of high-speed railway bridge is studied. The results show that, The stability of foundation pit itself and the position of water level after dewatering have an important influence on the horizontal displacement of bridge piers of high-speed railway bridges. Whether the distance between foundation pit and high-speed railway is more than 20m should not be taken as safety standard, but based on the depth, size and degree of dewatering of foundation pit, combined with the distance between foundation pit and high-speed railway, the mechanical parameters of stratum soil and so on. Comprehensive evaluation of its impact on the high-speed railway.
【作者单位】：上海铁路局工务处;
【分类号】：U238;U443.22

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