未打穿散体材料桩复合地基固结简化解研究

发布时间：2018-02-24 15:23

  本文关键词： 散体材料桩复合地基 未打穿 等效双层地基 平均固结度 解析解　出处：《岩土力学》2014年05期 　论文类型：期刊论文

【摘要】：利用平均固结度普遍解,将未打穿散体材料桩复合地基转化为等效双层地基,推导出未打穿散体材料桩复合地基固结简化解,给出其平均固结度计算简化公式。根据简化解、现有解和有限单元法编制程序,绘制考虑贯入比、桩体渗透系数、土体扰动区渗透系数和土体扰动区影响因子等因素对固结的影响曲线图,分析了各因素对未打穿散体材料桩复合地基固结性状的影响,并对3种计算方法所求出的平均固结度进行了比较研究,进而探讨了简化解的适用性。研究结果表明,无论是在单面排水还是在双面排水条件下,简化解求出的平均固结度总体上是介于现有解和有限单元法二者之间,尤其在固结过程的"中后期"(即固结度≥50%时)。从实用角度来看,简化解的计算结果具有足够精度,且简便、实用;在各种影响因素中,散体材料桩长度和桩体渗透系数对固结过程的影响最大。
[Abstract]:By using the general solution of average consolidation degree, the composite foundation with unpierced bulk material pile is transformed into equivalent double-layer foundation, and the simplified consolidation solution of the composite foundation with unpierced bulk material pile is derived, and the simplified formula for calculating the average consolidation degree is given according to the simplified solution. The existing solution and finite element method are used to draw up the influence curves of factors such as penetration ratio, permeability coefficient of pile body, permeability coefficient of soil disturbance zone and influence factor of soil disturbance zone on consolidation. In this paper, the influence of various factors on consolidation behavior of composite foundation with unpierced bulk material pile is analyzed, and the average consolidation degree calculated by three calculation methods is compared, and the applicability of the simplified solution is discussed. The average degree of consolidation obtained by the simplified solution is generally between the existing solution and the finite element method. Especially in the "middle and late stage" of consolidation process (that is, consolidation degree 鈮，

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