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Ⅰ、前言铁路桥台设计中,土压力计算是否考虑外摩擦角,各国尚不一致,采用数据也不相同。我国现行铁路桥涵规程,以不考虑外摩擦角进行计算。但据估算,在一般情况下,考虑外摩擦角比不考虑外摩擦角(其他条件相同),其桥台倾复力矩减小20%。可见外摩擦角对减小桥台截面有显著影响,所以有必要进行外摩擦角试验。本试验结构为模拟桥台,结合现埸实际情况,对桥台背与填土问在不同情况下(包括平行移动、转动、振动、模拟雨季)的台背状态、土壤含水量、机械振动等,进行了外摩擦角及土压力变化规律的测试。
Ⅰ. Foreword In the design of railway abutments, whether the earth pressure calculation considers the external friction angle or not, the data are not the same in different countries. China’s current railway bridge Culvert regulations, without considering the outer friction angle calculation. However, it is estimated that under normal circumstances, the external friction angle is reduced by 20% compared with the case without considering the external friction angle (other conditions are the same). Visible external friction angle to reduce the abutment section has a significant impact, it is necessary for external friction angle test. The structure of this experiment is a simulated abutment. According to the actual situation of the abutment, the abutment condition, soil moisture content, mechanical vibration and so on under different conditions (including parallel movement, rotation, vibration and simulated rainy season) , The external friction angle and the test of variation of earth pressure were carried out.