文档介绍：
顶部加箍碎石桩复合地基沉降计算方法
吴梦婷 1,2,陈昌富 1
(,长沙 410082;
,广州 510403)
摘要:针对工程实践中出现的顶部加箍碎石桩复合地基形式,分析了其破坏模式,探讨其沉降变形量
计算方法。依据顶部加箍碎石桩的变形特性,将复合地基划分成加箍区、鼓胀区、非鼓胀区以及下卧
层 4 个分区,建立了沉降计算模型。基于弹性力学中空间问题的虎克定律,考虑土工格栅的抗拉强度
的影响,分析得到了加箍区沉降量;考虑桩体变形前后体积不变,推导出鼓胀段和非鼓胀段沉降计算
公式;采用分层总和法计算下卧层沉降量。通过对比分析发现,采用上述方法计算得出的结果与实测
及有限元计算方法得到的结果值都比较接近,符合实际工程要求。
关键词:复合地基;碎石桩;土工格栅;沉降计算
putation posite foundation of upper
geosynthetic-encased stone column
Wu Mengting1,2, Chen Changfu1
(1. Geotechnical Engineering Institute, Hunan University, Changsha,China
410082;
2. Guangzhou Construction Project Vocational School, Guangzhou,China
510403)
Abstract: The upper-geosynthetic-encased stone column (UGESC) is widely used in engineering
practice as posite foundation. Its failure modes are analyzed and the calculation method of
its settlement is discussed in this paper. Based on the deformation characteristics of UGESC, the
calculation models are established for the settlement calculation, which is divided into four parts,
., the encased segment, ballooning section, no ballooning section and underlying stratum. The
settlement of the encased segment can be carried out based on the Hooke's law of space problem
in elastic mechanics and taking into account the effect of tensile strength of the encased stuff. The
settlement of ballooning section and no ballooning section can be carri