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为了给群桩基础优化设计以及既有桩基利用条件下的新桩桩长设计提供参考,基于剪切位移法理论,建立单桩桩顶荷载-位移模型;提出等沉降原理,考虑群桩效应建立群桩沉降计算模型,并解析群桩临界桩长关系。根据模型函数优化法验证其桩长关系的合理性,并分析不同土的泊松比、桩间距和桩的弹性模量对群桩长度的影响。结果表明:随长桩长度增加,短桩长度达到峰值后减小;土的泊松比、桩间距和桩的弹性模量等参数取值增大时,短桩长度峰值增大,但增幅不同;在总桩长一定时,与等桩长时相比,变桩长群桩基桩的柔度值相对误差显著减少。
In order to provide reference for the design optimization of pile group foundation and the design of new pile length under the condition of existing pile foundation utilization, the load-displacement model of single pile top is established based on the theory of shear displacement method. Settlement calculation model of group pile is established, and the critical pile-length relationship of group pile is analyzed. According to the model function optimization method, the rationality of pile-length relationship was verified, and the effects of Poisson’s ratio, pile spacing and pile’s elastic modulus on pile group length were analyzed. The results show that with the increase of the length of the pile, the length of the pile decreases, and the peak value of the pile length increases with the increase of the Poisson’s ratio, the pile spacing and the elastic modulus of the pile. However, ; When the total length of the pile is fixed, the relative error of the flexibility value of the pile with long pile group becomes significantly smaller than that of the long pile.