升温作用下整体桥台台后土压力计算方法的探讨

对在升温作用下,整体式桥台桥梁台后土压力的计算方法进行研究。分别采用Broms法、m法及p-y曲线法计算桥台背墙后填土的水平抗力系数;采用m法及p-y曲线法计算台柱土的水平抗力系数和台桩、墩桩侧土的水平抗力系数;采用TDV软件模拟土对桩端的约束作用。通过对不同方法计算的台后土压力的对比分析,得知:在计算升温引起的整体式桥台桥梁台后土压力时,桥台背墙及台柱土的水平抗力系数计算采用m法是不适合的;桥台背墙后填土的水平抗力系数可采用Broms法计算;土对台桩及墩桩侧的水平抗力系数按p-y曲线来考虑是适合的。

Study of Calculating Methods for Earth Pressure Behind Abutment of Integral Abutment Bridge Under Action of Rising Temperatures

The calculating methods for earth pressure behind the abutment of integral abutment bridge under the action of rising temperatures are studied.The Broms method,m method and p-y curve method are respectively used to calculate the horizontal resistance coefficient of the filled earth behind the abutment back wall,the m method and p-y curve method are used to calculate the resistance coefficients of the earth around the abutment column and at the sides of the abutment and pier piles.The TDV software i8 used to simulate the restraint of the earth to the piles ends.Through the comparative analysis of the earth pressure calculated by the different calculation methods,it is known that when the earth pressure behind the abutment of the integral abutment bridge under the action of rising temperatures is calculated,it is not proper to use the m method to calculate the resistance coefficients of the abutment back wall and column earth while the resistance coefficient of the abutment back wall earth can be calculated by the Broms method.It iS proper that the resistance coefficients of the earth of the abutment and pier piles should be considered by the p-y curve.