路桥交界处地基附加应力修正计算方法

Modified method for additional stress of bridge-approach foundation under subgrade load

台后地基变形是引起桥台变位的关键因素,对台后过渡段地基变形的探讨有助于对桥台变位问题的深入研究。基于弹性理论,推导了任意断面形式路基荷载作用下,过渡段地基及其临近影响地基内部任意一点的附加应力计算公式,并以铁路标准路基断面为例对推导公式可应用性进行分析,得出路桥过渡段地基附加应力横向和纵向的分布规律,并分析了过渡段路基填筑对既有临近建筑物产生的影响。在此基础上,采取数值模拟的方法,验证了推导公式的合理性。该计算方法思路清晰,数学逻辑严密,且易于计算机编程计算,从而为过渡段及其临近地基附加应力计算提供了理论依据,为桥台变形的研究提供了理论支撑。

The deformation of bridge-approach foundation is the key factor to cause that of bridge abutment, so the study on the bridge-approach deformation contributes to the further study on abutment deformation. Based on the elastic theory, a formula for additional stress of bridge-approach foundation and adjacent surroundings under an arbitrary subgrade section load is derived. The distribution rules of additional stress of approach foundation under a standard railway embankment section load are obtained, and the response of the adjacent buildings to the approach foundation under the subgrade load is analyzed. On this basis, the rationality of the formula is verified by means of numerical simulation. The results show that the proposed method is clear in thought, mathematically logic, and easy in programming. It may provide the theoretical basis for calculation of additional stress and the theoretical support for the studies on abutment deformation.