摘要
本文进行了竖向活动门试验,探究了主动和被动活动门位移模式、不同活动门宽度、以及不同活动门位移量对土压力的影响,分析了土压力变化过程中土拱效应的动态演化规律以及土拱效应对土压力的作用。试验结果发现竖向土拱效应活动门试验中,活动门产生主动位移后,挡板上的土压力不断增大而活动门上方的土压力则不断减小。活动门产生被动位移后,挡板上的土压力减小,而活动板上的土压力因为土拱效应的作用增加。土压力的变化主要因为土拱效应的作用。活动板上的砂土土压力稳定时的临界位移量与活动门位移模式以及活动门宽度有关。砂土顶部的位移与活动门位移的关系基本呈两段直线。
In this paper, vertical trap-door tests were conducted to explore the influence of active and passive displacement modes of trap-door, different widths of movable plates and different distances of trap-doors on earth pressure, and the dynamic evolution law of soil arch effect. And the effect of soil arch effect on earth pressure in the process of changing earth pressure is analyzed. The results show that the earth pressure on the fixed wall increased while the earth pressure on the trap-door decreased after the active displacement of the trap-door. After the passive displacement of the trap-door, the earth pressure on the fixed wall decreased, but the earth pressure on the movable plate increased because of the soil arching effect. The change of earth pressure is mainly due to the effect of soil arching. The critical displacement of the sand on the movable plate is related to the displacement mode and the width of the trap-door. The relationship between displacement of sand top and displacement of trap-door is basically two straight lines.
出处
《土木工程》
2021年第8期747-757,共11页
Hans Journal of Civil Engineering
