同一场地上不同桩型复合地基的静力特性试验

发布时间：2018-10-25 07:39

【摘要】：该文对同一场地上的碎石桩复合地基、CFG桩复合地基、CFG长桩和水泥土短桩组合桩复合地基和CFG芯水泥土桩复合地基进行了现场载荷试验和变形试验。试验结果表明:桩径和桩间距相同条件下,两种组合桩的荷载沉降曲线接近线性关系,碎石桩复合地基荷载沉降呈明显的非线性关系;单一桩型复合地基承载力略高于两种桩型组合桩复合地基的承载力,碎石桩、CFG桩、CFG长桩水泥土短桩组合桩和CFG芯水泥土桩组合桩复合地基的承载力分别为210kPa、225kPa、197kPa和182kPa;CFG桩与桩间土之间的应力比,CFG芯水泥土桩组合桩复合地基最小、其次是CFG桩复合地基、CFG长桩水泥土短桩组合桩复合地基中最大。从应力分布的观点CFG芯水泥土组合桩复合地基应力分布较其他三种复合地基均匀;复合地基的深层变形受布桩形式的影响较大。
[Abstract]:The field load tests and deformation tests of gravel pile composite foundation, CFG long pile, cement soil short pile composite foundation and CFG core cement soil pile composite foundation on the same site are carried out in this paper. The test results show that the load settlement curve of the two composite piles is close to linear relationship under the same pile diameter and spacing, and the load settlement of gravel pile composite foundation is obviously nonlinear. The bearing capacity of single pile composite foundation is slightly higher than that of two kinds of pile composite foundation. The bearing capacity of gravel pile, CFG long-pile cement-soil short pile composite pile and CFG core cement-soil pile composite foundation are 210kPa225kPa197kPa and 182kPa-CFG pile and interpile soil respectively, and CFG core cement-soil pile composite foundation is the smallest. Secondly, CFG pile composite foundation, CFG long pile cement soil short pile composite foundation is the largest. From the point of view of stress distribution, the stress distribution of CFG core cement-soil composite pile composite foundation is more uniform than that of other three kinds of composite foundation, and the deep deformation of composite foundation is greatly affected by pile distribution.
【作者单位】：河北大学建筑工程学院;
【基金】：河北省自然科学基金项目(2011-E080601)
【分类号】：TU473.1

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