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现阶段高挡墙桩基设计时一般不计入护底的受压作用,而是假定水平荷载均由桩基承担,导致布桩数量过多、设计偏于保守。为了优化桩基布置,基于位移协调一致原理,提出了一种考虑护底与桩基联合承受水平荷载的设计方法。分别采用联合承载计算方法和三维有限元法对实际泵站工程进行计算,并利用实际监测资料对计算结果进行验证。结果表明,高挡墙考虑护底受压后,约90%的水平荷载由护底承担,群桩的水平荷载很小,故设计时宜以满足竖向承载力为优先条件,适当减少布桩数量。
At this stage, the design of high retaining wall pile foundation is generally not included in the compression of the protective bottom, but assume that the horizontal load is borne by the pile foundation, resulting in too many piles, the design is conservative. In order to optimize the pile foundation layout, a design method considering the combined load of the bottom and the pile foundation is proposed based on the principle of coordinated displacement. The joint bearing calculation method and three-dimensional finite element method are respectively used to calculate the actual pumping station project, and the actual monitoring data are used to verify the calculation results. The results show that about 90% of the horizontal load is assumed by the bottom and the horizontal load of the pile group is small when considering the compression of the bottom retaining wall. Therefore, in order to meet the requirement of vertical bearing capacity, it is preferable to reduce the number of piles .