黏性土填料下考虑土拱效应的非极限主动土压力计算方法

发布时间：2018-01-10 00:01

本文关键词：黏性土填料下考虑土拱效应的非极限主动土压力计算方法　出处：《岩土力学》2015年04期 　论文类型：期刊论文

【摘要】：不论挡土墙填料采用砂性土,还是黏性土,其墙背主动土压力与墙体倾角和位移关系存在较大的联系,因而研究黏性土填料下的非极限主动土压力计算理论具有重要意义。通过应力状态分析给出了非极限状态下考虑土拱效应的侧向主动土压力系数,然后采用水平微分层析法给出了倾斜墙下非极限主动土压力解析解。通过与室内模拟试验及已有理论进行对比,验证了该方法的合理性。最后研究了相关参数包括位移比η,墙土摩擦角与内摩擦角之比δ/φ,墙体倾角g,黏聚力c等对主动土压力分布及其作用点高度的影响。结果表明:土体由静止状态向极限主动土压力状态发展时,土拱效应的影响会越来越大。随着δ/φ的不断增大,土压力分布曲线非线性强度会不断增强,土压力合力作用点高度呈上升趋势,并且δ/φ对土压力的影响会随着位移比η的增大而增大。随着挡土墙墙背倾斜角度ε的不断增大,土拱效应对非极限主动土压力的影响减小。随着土体填料黏聚力的不断增大,上部张拉裂缝高度也会随之增加,且土压力合力作用点越低。给出的考虑土拱效应的非极限主动土压力计算方法对于丰富挡土墙土压力计算理论具有重要意义。
[Abstract]:Whether the retaining wall is filled with sand soil or clay soil, the active earth pressure on the back of the wall is closely related to the inclination and displacement of the wall. Therefore, it is of great significance to study the calculation theory of non-limit active earth pressure under clay fillers. Through the stress state analysis, the lateral active earth pressure coefficient considering the soil arch effect is given. Then the analytical solution of the non-limit active earth pressure under the inclined wall is given by using the horizontal differential chromatography method, which is compared with the indoor simulation test and the existing theory. The rationality of the method is verified. Finally, the relative parameters, such as displacement ratio 畏, the ratio 未 / 蠁 of the friction angle of the wall to the internal friction angle and the inclination angle of the wall, are studied. The influence of cohesive force c on the distribution of active earth pressure and the height of active earth pressure. The results show that when the soil develops from static state to limit active earth pressure state. With the increasing of 未 / 蠁, the nonlinear strength of the earth pressure distribution curve will be strengthened, and the height of the earth pressure force acting point will increase. And the influence of 未 / 蠁 on earth pressure will increase with the increase of displacement ratio 畏, and with the increasing of slope angle 蔚 at the back of retaining wall. The influence of the soil arch effect on the non-limiting active earth pressure is reduced. With the increasing of the cohesive force of the soil filler, the height of the upper tensile crack will also increase. Moreover, the lower the earth pressure acting point is, the more important the non-limit active earth pressure calculation method, which considers the soil arch effect, is used to enrich the theory of earth pressure calculation for retaining walls.
【作者单位】：安徽理工大学土木建筑学院;安徽理工大学土木工程博士后科研流动站;
【分类号】：TU432
【正文快照】： 1引言现今,学者们对挡土墙土压力的影响因素有了更深入地认识与了解,包括:位移条件、位移模式以及土拱效应等。为了考虑这些因素的影响,学者们不断地进行探索,并且发展了很多的土压力计算理论[1-5]。为了研究土体在非极限状态下的土压力,众多学者如Bang[1]、Chang[2]、蒋波[3]

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