刚性桩复合地基侧向土压力试验研究

发布时间：2018-05-02 10:40

本文选题：刚性桩复合地基 + 侧向土压力　；参考：《岩土力学》2014年06期

【摘要】：通过室内模型试验,实测得到试验条件下,天然地基和刚性桩复合地基作用在不允许有位移的刚性挡土墙上的侧向土压力;通过与天然地基对比分析,获得了刚性桩复合地基的侧向土压力特性及分布规律。结果表明,刚性桩复合地基中桩的参与(包括桩的荷载深层传递作用、桩负摩擦区的影响和桩体对桩间土水平附加应力的"遮拦"作用等)使复合地基侧向土压力大小和分布规律明显区别于天然地基;在给定荷载水平下,刚性桩复合地基的侧向土压力值低于天然地基,侧向土压力影响范围较天然地基作用位置更深;在试验条件下,刚性挡土墙距离建筑物0.35~1.4 m范围内,当荷载水平达到地基承载力特征值时,刚性桩复合地基作用在刚性挡土墙上的总土压力和附加土压力约为天然地基的43.3%~80.1%和15.9%~59.8%。
[Abstract]:Through the laboratory test, the lateral earth pressure of the rigid retaining wall under the condition of the natural foundation and the rigid pile composite foundation is measured under the test conditions. The lateral earth pressure characteristics and distribution law of the rigid pile composite foundation are obtained by comparison with the natural foundation. The results show that the rigid pile composite foundation is in the composite foundation. The participation of pile, including the deep load transfer of pile, the influence of pile negative friction area and the "blocking" effect of pile on the additional stress on the soil level, makes the lateral earth pressure of composite foundation distincently different from the natural foundation, and the lateral earth pressure of the rigid pile composite foundation is lower than the natural foundation under the given load level. The influence range of lateral earth pressure is deeper than that of natural foundation; under the test conditions, when the rigid retaining wall is within the range of 0.35~1.4 m of the building, when the load level reaches the characteristic value of the foundation bearing capacity, the total soil pressure and the additional earth pressure on the rigid retaining wall are about 43.3%~80.1% and 15.9 of the natural foundation. %~59.8%.

【作者单位】：中国建筑科学研究院地基基础研究所;
【分类号】：TU470;TU432

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