CFG芯水泥土环组合桩复合地基动力特性试验研究

发布时间：2018-05-18 00:46

本文选题：爆破地震动 + 现场载荷试验　；参考：《工程力学》2015年S1期

【摘要】：基于优化桩型的观点,将工法成熟的水泥粉煤灰碎石桩(简称CFGP)和夯实水泥土桩(简称RCSP)进行组合,设计CFG芯桩-水泥土环桩(简称CFGCP-RCSLP)组合桩复合地基,通过现场试验研究CFGCP-RCSLP组合桩复合地基的静力特性和动力特性。现场载荷试验表明,当土性、桩长、桩间距相同的情况下,CFGCP-RCSLP组合桩复合地基的荷载沉降曲线具有明显的线性关系,复合地基承载力比CFGP复合地基降低19.1%,比RCSP桩复合地基降低23.8%,比天然地基增加了102%。现场爆破试验表明,在爆炸能量、爆炸点位置相同条件下,复合地基的动力特性主要取决于土性、桩体刚度分布和堆载的大小。爆炸点的位置直接影响CFGCP-RCSLP组合桩复合地基中峰值加速度沿桩体的分布规律,堆载的增加使得各测点的峰值加速度明显降低。
[Abstract]:Based on the view of optimizing pile type, the composite foundation of CFG core pile-cement-soil annular pile (CFGCP-RCSLP) is designed by combining the cement fly ash gravel pile (CFGP) and rammed cement-soil pile (RCSP). The static and dynamic characteristics of CFGCP-RCSLP composite foundation are studied by field test. Field load test shows that the load settlement curve of CFGCP-RCSLP composite foundation has obvious linear relationship when soil property, pile length and pile spacing are the same. The bearing capacity of the composite foundation is 19.1 lower than that of the CFGP composite foundation, 23.8of the RCSP pile composite foundation, and 1022.2% higher than that of the natural foundation. Field blasting tests show that the dynamic characteristics of composite foundation are mainly determined by soil properties, pile stiffness distribution and pile load under the same explosion energy and explosion point position. The location of explosion point directly affects the distribution of peak acceleration along the pile body in the composite foundation of CFGCP-RCSLP composite pile, and the increase of surcharge makes the peak acceleration of each measuring point obviously lower.
【作者单位】：河北大学建筑工程学院;中国冶金勘察设计研究公司;邢台职业技术学院;
【基金】：河北省自然科学基金项目(2011-E080601)
【分类号】：TU473.1

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