加筋土桥台台背土压力的试验研究

Experimental Research of Earth Pressure Behind Bridge Abutment of Reinforced Filling Soil

为了对比在桥台填土施工中,铺设土工格栅对减小桥台土压力的作用,在宁淮高速公路东一道跨线桥桥台填土施工中,东侧桥台填土中未铺设土工格栅,西侧桥台填土中铺设土工格栅,对其桥台台背土压力进行长时间观测,分析了土压力随时间的变化、土压力随填土高度的变化以及填土完成后土压力的大小与分布情况。分析结果表明,台背土压力沿桥台深度方向呈非线性分布;土压力随着至桥台顶部距离的增大而增加,但到达一定深度后,随着深度的增加,土压力反而减小;铺设土工格栅能明显降低桥台台背的土压力。

In order to compare the effect of laying geogrid in reducing the earth pressure of abutment during the embankment construction,the field test was carried out in the Dong yi-dao＇s viaduct bridge of Ninghuai expressway.There is no geogrid in the soil filling of the east abutment,but there is geogrid in the soil filling of the west abutment.Therefore,a long-time in-situ observation was practiced to gain the first material.Based on the experiment results,the changing of the earth pressure with time and the height of embankment,the magnitude and distribution of earth pressures behind the abutment are given were analyzed.The results show that the earth pressure behind abutment is nonlinearity with the depth of abutment.To begin with,the earth pressure of abutment increased with the depth of abutment,Later,it decreased with the increasing depth of abutment.The earth pressure will be significantly reduced in laying geogrid of abutment.Therefore,laying geogrid filling can significant reduce the earth pressure behind bridge abutment.