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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%。
Through the indoor model test, the lateral earth pressure acting on the rigid retaining wall which is not allowed to displace, is obtained through the test under the experimental conditions. By comparing with the natural foundation, the rigid foundation of the rigid pile composite foundation Lateral earth pressure characteristics and distribution. The results show that the participation of the pile in the rigid pile composite foundation (including the deep load transfer of the pile, the influence of the negative friction zone of the pile and the “obstruction” effect of the horizontal additional stress of the pile body on the pile) Under the given load level, the lateral earth pressure of rigid pile composite foundation is lower than that of natural foundation, and the influence range of lateral earth pressure is deeper than that of natural foundation. Under the test conditions , The rigid earth retaining wall is within 0.35 ~ 1.4 m from the building. When the load level reaches the characteristic value of foundation bearing capacity, the total earth pressure and additional earth pressure acting on the rigid retaining wall of the rigid pile composite foundation are about natural foundation Of 43.3% ~ 80.1% and 15.9% ~ 59.8%.