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天然饱和黏土中静压桩沉桩结束后其桩周土体逐渐固结,由于旧桩周围土体已完全固结,其桩周土体的力学特性与新桩有显著差异,承载特性亦有较大区别。针对新、旧桩单桩的荷载–沉降特性,在考虑土体初始各向异性、沉桩效应的基础上,基于柱孔不排水扩张后桩周土体应力与孔压基本解答,研究新、旧桩周土体力学特性的差异。在此基础上,根据新、旧桩周土体的力学特性和桩侧土体在加载过程中的力学特性,提出分别适用于新桩与旧桩的荷载传递模型,并通过与现场试验结果对比进行验证。研究结果表明,该荷载传递模型能较好地预测新、旧桩的荷载–沉降关系,对新、旧桩混合桩基承载机制的深化认识及其优化设计理论的完善都具有重要意义。
The soil around the pile is gradually consolidated after the pile of static pressure pile in natural saturated clay is completed. Because the soil around the pile has been completely consolidated, the mechanical properties of soil around the pile are significantly different from that of the new pile, and the bearing characteristics are also Big difference. Based on the load-settlement characteristics of new and old pile-single pile, based on the initial anisotropy of soil and pile-sinking effect, based on the basic solutions of soil stress and pore pressure around piles under undrained expansion, Differences of soil mechanics characteristics of old pile. On this basis, according to the mechanical properties of soil around the old and new piles and the mechanical properties of soil during loading, the load transfer models applied to the new piles and the old piles respectively are proposed. By comparison with the field test results authenticating. The results show that the load transfer model can predict the load-settlement relationship of new and old piles well, and is of great significance to deepen the understanding of bearing capacity of new and old pile mixed piles and to perfect the optimization design theory.