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桩足够长、桩间距不大于6倍桩径的刚性桩复合地基中,在桩间土内部的剪切力和桩土间摩擦力共同作用下,桩顶段桩间土压力仅在一定深度范围内有所增加,且随深度迅速衰减,而桩顶段桩身轴力随深度增加。基于刚性桩复合地基的这一特点,紧邻刚性桩复合地基开挖基坑且基坑底高于刚性桩桩底时,得出刚性桩复合地基上的附加荷载作用在支护结构上的主动土压力可以简化为倒三角形,最大主动土压力作用在刚性桩桩顶平面与支护结构相交处,随深度增加,主动土压力迅速衰减至0。实践表明该计算方法比较符合工程实际。
In the rigid pile composite foundation with a pile spacing of not more than 6 times the pile spacing, under the joint action of the shear force inside the pile soil and the friction between the pile and pile, the earth pressure between the piles at the top of the pile is only within a certain depth range And increased rapidly with the depth, while the axial force of the pile at the top of pile increased with depth. Based on this feature of the rigid pile composite foundation, when the excavation foundation pit of the rigid pile composite foundation is near and the foundation bottom is higher than that of the rigid pile bottom, it is concluded that the additional load on the rigid pile composite foundation acts on the active soil The pressure can be reduced to an inverted triangle. The maximum active earth pressure acts on the intersection of the top surface of the rigid pile and the support structure. As the depth increases, the active earth pressure rapidly decays to zero. Practice shows that the calculation method is more in line with the actual project.