经典的朗肯土压力理论忽略了墙土内摩擦角与挡墙倾角对土压力的影响,计算模型简便,而库伦土压力理论虽考虑因素较多,但没有考虑黏聚力对土压力的影响。为更好地反映挡墙墙后黏性土土压力的变化规律,在库伦土压力理论基础上,推导了一种能考虑墙土摩擦角、墙顶张拉裂缝高度、墙体位移状态及折线滑移面的黏性土主动土压力计算方法,采用其他常用理论与模型实测值对比验证,证明了该方法对计算墙后黏性土主动土压力计算的有效性。与其他类似方法相比,该方法计算的墙后黏性主动土压力与模型实测值更为接近,且计算过程更为简便;当黏聚力为0时,该方法可直接化简为库伦主动土压力公式。因此,该法对实际支挡工程具有一定的理论指导意义。
Abstract
The classical Rankine's earth pressure theory, despite its convenience, neglects the influence of soil's friction angle and retaining wall's inclination on soil pressure, while Coulomb's earth pressure theory does not consider the cohesion of soil. To better reflect the change law of earth pressure behind retaining wall, a formula is derived based on Coulomb's earth pressure theory for cohesive soil. The friction angle between soil and wall, the height of tensile crack on the top of retaining wall, the displacement state of retaining wall, and the broken-line sliding surface are considered in the method. The effectiveness of the method for cohesive soil is verified by comparing theoretical calculations with model measurements. Compared with other theories, the proposed method is simpler and the calculated result is closer to measurements. The present formula can be simplified to Coulomb's formula of active earth pressure when cohesion is zero.
关键词
挡墙 /
黏性土 /
主动土压力 /
摩擦角 /
极限状态 /
滑动面
Key words
retaining wall /
cohesive soil /
active earth pressure /
friction angle /
limit state /
sliding surface
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基金
国家自然科学基金面上项目(41272333);国家重点基础研究发展计划项目(2011CB013501)
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