软土地基刚性桩复合地基沉降计算的简化方法

发布时间：2018-01-18 03:33

本文关键词：软土地基刚性桩复合地基沉降计算的简化方法　出处：《岩土工程学报》2017年S2期 　论文类型：期刊论文

【摘要】：既简便又具有较好精度的刚性桩复合地基沉降计算方法仍是工程实践中迫切需要而又有待于解决的问题。对于软土地基中的刚性桩复合地基沉降计算,现行规范方法把其沉降分为加固区的沉降和下卧层的沉降,加固区复合模量的提高采用复合地基与天然地基承载力的倍数求得,实际发现这样得到的加固区复合模量的提高不够,造成计算沉降偏大。本文认为造成这种情况的原因是由于公式推导中假设了桩土应力比与桩土承载力比相等而造成的。另外对于软土地基刚性桩复合地基沉降计算,当桩底置于可靠持力层时,提出其复合地基的沉降可以简化为桩的沉降加褥垫层的压缩沉降的简化方法。工程实例表明,简化方法既简便又具有较好的精度,可为工程实践提供一个有效实用的计算方法。
[Abstract]:The settlement calculation method of rigid pile composite foundation, which is simple and accurate, is still an urgent need in engineering practice and needs to be solved. For the settlement calculation of rigid pile composite foundation in soft soil foundation. According to the current code, the settlement is divided into the settlement of the strengthened area and the settlement of the underlying layer. The improvement of the composite modulus of the strengthened zone is obtained by the multiple of the bearing capacity of the composite foundation and the natural foundation. It is found that the improvement of composite modulus is not enough. It is believed that the reason for this is the assumption in formula derivation that the ratio of pile to soil stress is equal to that of pile-soil bearing capacity. In addition, the settlement meter of rigid pile composite foundation on soft soil foundation. Yeah. When the pile bottom is placed in a reliable bearing layer, it is proposed that the settlement of the composite foundation can be simplified as the settlement of the pile and the compression settlement of the cushion. The engineering example shows that the simplified method is simple and has good accuracy. It can provide an effective and practical calculation method for engineering practice.
【作者单位】：华南理工大学土木与交通学院;广东省水利水电科学研究院;广东省岩土工程技术研究中心;
【基金】：广东省省级科技计划项目(2014B070706008) 广东省水利科技创新项目(2009-25)
【分类号】：TU433
【正文快照】： 1技术规范1.1建筑地基处理技术规范《建筑地基处理技术规范》(JGJ 79—2012)[1]规定的计算方法是目前刚性桩复合地基沉降计算中用得最多的,该方法对加固区和非加固区均采用分层总和法计算其沉降,加固区沉降按复合模量法计算,复合模量提高系数等于复合地基与天然地基承载力的倍

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