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土拱效应对倾斜挡土墙下的主动土压力及被动土压力有重要的影响,但是相关计算理论研究略显不足。为了将土拱效应考虑到倾斜挡土墙下的土压力计算中,首先通过应力摩尔圆及静力平衡法分别给出了考虑土拱效应下主动土压力及被动土压力计算所需的两大因素:侧向土压力系数及竖向平均应力公式。在此基础上建立了考虑土拱效应的倾斜挡土墙主动土压力及被动土压力的统一表达式,并将其应用到求解土压力合力及其作用点高度的计算中。算例表明,土拱效应对于主动土压力与被动土压力的影响不同。随着墙体倾角的增大,主动土压力作用点高度逐渐降低,即土拱效应随着墙体倾角的增大而降低。与前述相反,随着墙体倾角的增大,被动土压力作用点高度逐渐降低,即土拱效应的影响随着墙体倾角的增大而增大。
The effect of soil arching has an important influence on the active earth pressure and passive earth pressure under the inclined retaining wall, but the relevant theoretical researches are not enough. In order to consider the soil arching effect in the calculation of the earth pressure under the inclined retaining wall, the two major components of active earth pressure and passive earth pressure under the soil arching effect are first given through the stress-molar circle and static balance method Factors: lateral earth pressure coefficient and vertical average stress formula. On this basis, the unified expression of active earth pressure and passive earth pressure of inclined retaining wall considering soil arching effect is established and applied to the calculation of earth pressure force and its action point height. The example shows that the effect of soil arching on active earth pressure and passive earth pressure are different. With the increase of wall inclination, the action point of active earth pressure gradually decreases, that is, the soil arching effect decreases with the increase of wall inclination. Contrary to the above, with the increase of wall inclination angle, the action point of passive earth pressure gradually decreases, that is, the effect of soil arching increases with the increase of wall inclination.