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EXPERIMENTAL RESEARCH ON THE EARTH PRESSURE BEHIND ABUTMENT
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摘要: 高速铁路桥台台后填土从填料选择、施工控制、质量监测等方面均不同于常规铁路，但是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。基于此，结合现场试验对高速铁路桥台台背土压力进行长时间观测，根据实测结果分析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，土压力随着距离桥台顶部距离的增大而增加，但到达一定深度后随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。Abstract: The embankment behind the abutment of a high-speed railway is different in the aspects of padding, construction control and quality supervision from the general railway.However,there is a little experimental research on the earth pressure behind abutment,and there are lots of factors to influence the earth pressure also,and the distribution of the earth pressure is not exact predicted through actual earth pressure theories.Therefore,a long-time site observation should be done.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 analyzed.Test results show that the earth pressure behind abutment is nonlinearly following the depth of abutment.To begin with,the earth pressure of abutment is increased with the depth of abutment,yet after reaching a certain depth it decreased with the increase in depth abutment.The comparison is made between the results by formula and those with the experimental observations,the points of application of the resultant earth pressures have significant difference,the height of actual point of resultant earth pressure is 0.41 times of the embankment height.
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Key words:
- earth pressure /
- abutment /
- high-speed railway /
- point of resultant force
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