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一、竖向活载对桥台的土压力计算简介现行的《铁路工程技术规范第二篇桥涵》(以下简称《桥规》)第2—65条规定了竖向活载在台后产生的侧向土压力,可按附录七计算。在计算活载对桥台的土压力时,假定在轨底平面上有一假想之填土,使其产生的单位面积上的竖向压力等于超载所产生的单位面积上的平均竖向压力。按一个竖向轴重纵向分布长度1.5米(等于轴距),横向分布宽度2.5米(一根枕木长度),得q=22/(1.5×2.5)≈6吨/米~2。然后,再假定q在轨底平面下对桥台背
First, the vertical live load on the abutment earth pressure calculation Brief introduction Current “Railway Engineering Technical Specification Bridge Bridges” (hereinafter referred to as “bridge gauge”) Article 2-65 provides for vertical live load generated in the back Lateral earth pressure, can be calculated according to appendix VII. In calculating the earth pressure on the abutment, it is assumed that there is an imaginary fill in the bottom of the rail so that the vertical pressure per unit area it produces is equal to the average vertical pressure per unit area generated by overloading. According to a vertical axis longitudinal distribution length of 1.5 meters (equal to the wheelbase), horizontal distribution width of 2.5 meters (a sleeper length), so q = 22 / (1.5 × 2.5) ≈ 6 tons / m ~ Then, let’s suppose that q rests on the abutment under the rail base plane