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首页> 外文期刊>Geotechnical and geological engineering >Plate Load Tests of Composite Foundation Reinforced by Concrete-Cored DCM Pile
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Plate Load Tests of Composite Foundation Reinforced by Concrete-Cored DCM Pile

机译：砼DCM桩加固复合地基的板载试验。

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摘要

The concrete-cored deep cement mixing (DCM) pile is a new kind of composite pile created by inserting precast core pile into the DCM column socket and has only been used in a few projects to date. The bearing mechanism of concrete-cored DCM pile composite foundation has not been investigated systematically. In this paper, plate load tests (PLT) on single pile composite foundation were conducted in Nanjing-Changzhou expressway, Xinhua district in Jiangyin city and Nanjing surrounding (NS) expressway. Following the results of the PLT, a comparison of ultimate bearing capacity between composite foundation reinforced by concrete-cored DCM pile and DCM column was made. During the PLT process, the vertical stress of surrounding soil and DCM column socket was measured using pressure cells. The vertical stress of precast core pile was obtained using steel stress gauge welded onto the reinforcement. Based on the vertical stress of surrounding soil, DCM column socket and precast core pile, the skin friction and load sharing ratio were obtained. The variation in surrounding soil properties depending on the installation of concrete-cored DCM pile was also analyzed using the results from cone penetration tests (CPT) taken in NS expressway. With the analysis of results for stress tests and CPT, the bearing mechanisms of composite foundation reinforced by concrete-cored DCM pile are obtained.
机译：混凝土芯深层水泥搅拌（DCM）桩是通过将预制芯桩插入DCM立柱承窝中而创建的一种新型复合桩，迄今为止仅在少数几个项目中使用。尚未对混凝土芯DCM桩复合地基的承载机理进行系统研究。本文在南京-常州高速公路，江阴市新华区和南京周边（NS）高速公路上进行了单桩复合地基的平板荷载试验（PLT）。根据PLT的结果，比较了混凝土芯DCM桩和DCM柱加固的复合地基的极限承载力。在PLT过程中，使用压力传感器测量了周围土壤和DCM色谱柱插座的垂直应力。预制芯桩的垂直应力是使用焊接在钢筋上的钢应力计获得的。根据周围土壤的竖向应力，DCM柱承窝和预制芯桩，获得了表皮摩擦力和荷载分担比。还使用在NS高速公路上进行的圆锥渗透试验（CPT）的结果分析了取决于混凝土芯DCM桩安装情况的周围土壤特性的变化。通过对应力测试和CPT结果的分析，得出了混凝土芯DCM桩加固复合地基的承载机理。

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