用土压力增量比分析加筋对桥台土压力的影响

Analysis on Earth Pressure of Bridge Abutment with Reinforced Earth by Earth Pressure in Increments

在宁淮高速公路东一道跨线桥桥台填土施工中,为了研究加筋对减小桥台土压力的影响,进行了现场试验。通过试验得出,桥台土压力沿桥台高度的分布并非光滑的二次曲线,而是不规则的S型曲线。为了消除施工现场各种因素对测试精度的影响,查找测量误差的原因,提出用土压力增量百分比ξ来表示土压力随填土高度增加的变化,以达到反映土压力变化趋势的目的。

During the embankment construction of the Dong yi-dao＇s viaduct bridge of Ninghuai expressway,there was the field test to study the effect of reinforced earth in reducing the earth pressure of abutment.Test results showed that the distribution of earth pressure along the height of abutment is not smooth quadratic curve,but rather an irregular S-shaped curve.In order to eliminate various factors effect on test accuracy in construction field and find out reasons of measurement error,it is suggest that is expressed as increase of earth pressure changes with the filling height.