桥台台背土压力的试验研究  

Experimental research of earth pressure behind bridge abutment

作　　者：陈雪华[1] 律文田[1] 王永和[1] 

机构地区：[1]中南大学土木建筑学院,长沙410075

出　　处：《岩土力学》2006年第8期1407-1410,1415,共5页Rock and Soil Mechanics

摘　　要：快速铁路桥台台后填土的填料选择、施工控制、质量监测等方面均不同于常规铁路,由于对桥台台背土压力研究并不多见,再加上影响土压力的因素比较复杂,目前的土压力理论还难以准确地反映土压力分布的实际情况。因此,结合现场试验,对快速铁路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、土压力随填土高度变化以及填土完成后台背土压力的大小和分布情况。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,随着深度的增大,土压力反而减小;土压力合力作用点要比理论上的土压力合力作用点有所上移,在0.41倍填土高度处。The embankment behind the bridge abutment of the high speed railway is different from the general railway in the aspects of padding, construction control and quality supervision. However, there is a little experimental research of the earth pressure behind abutment; and there are a lot of factors influencing the earth pressure also; and the distribution of the earth pressure is not exact predicted through actual earth pressure theories. Therefore, a long-time in-situ observation was practiced to gain the first materials. 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. Test results show, 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 minished with the depth increasing of abutment. The comparison are made between formula presented with the experimental observations; the points of application of the resultant earth pressures have significantly difference; the height of actual action point of resultant earth pressure is 0.41 of the embankment height.

关 键 词：土压力 桥台 高速铁路 合力作用点 

分 类 号：TU432[建筑科学—岩土工程]