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采用PFC3D颗粒流软件对筒形挡土墙主动土压力进行了数值模拟,得到了筒形挡土墙主动土压力随墙体位移的变化规律,分析了墙-土摩擦角对土压力的影响,并研究了筒形挡墙位移过程中墙周土体的应力分布,接触力变化等细观因素。结果表明:作用在筒形挡土墙上的土压力随着墙体位移的增加,土压力逐渐减小,最后趋于定值。土中环向应力随着距挡土墙距离的增大而增大,其最大值为初始环向应力的1.14倍,达到一定距离后逐渐减小并趋于初始应力值;径向应力则随着距挡土墙距离的增大而增大,但其值小于初始应力值,最后趋于初始应力值。对墙-土摩擦角的影响进行了分析,得出墙-土摩擦角增大,有利于竖向拱效应的发挥。并将本文所得数值模拟结果与现有筒形挡土墙土压力理论解进行了比较。
The PFC3D particle flow software was used to simulate the active earth pressure of the cylindrical retaining wall. The law of the active earth pressure of the cylindrical retaining wall with the displacement of the wall was obtained. The influence of the wall-soil friction angle on the earth pressure was analyzed. The microcosmic factors such as the stress distribution and the contact force change of the soil around the wall during the displacement of the tubular retaining wall were studied. The results show that the earth pressure acting on the cylindrical retaining wall decreases with the increase of the displacement of the wall, and finally tends to set value. Soil circumferential stress increases with the distance from the retaining wall, and its maximum value is 1.14 times of the initial circumferential stress. After reaching a certain distance, the stress gradually decreases and tends to the initial stress value. The radial stress increases with From the retaining wall increases the distance increases, but its value is less than the initial stress value, and finally tends to the initial stress value. The influence of the wall-soil friction angle is analyzed, and the result shows that the wall-soil friction angle increases, which is beneficial to the vertical arch effect. The numerical simulation results obtained in this paper are compared with the theoretical solutions for the earth pressure of the existing retaining wall.