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首页> 外文期刊>Proceedings of the Institutuion Civil Engineers >Field behaviour of stiffened deep cement mixing piles
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Field behaviour of stiffened deep cement mixing piles

机译：加筋深层水泥搅拌桩的现场特性。

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Full-scale pile load tests were performed on soft Bangkok clay improved by stiffened deep cement mixing (SDCM) piles and deep cement mixing (DCM) piles installed by jet-mixing to compare their performance. The SDCM pile is a DCM pile with a precast reinforced concrete core pile inserted in the middle. A series of full-scale tests consisting of axial compression, lateral and pullout interface between the concrete core pile and surrounding DCM material were performed. The length of the concrete core pile influenced both the ultimate axial bearing capacity and the settlement of the SDCM piles more than its section area. Furthermore, the section area of the concrete core pile affected both the lateral ultimate bearing capacity and the lateral displacements of SDCM piles significantly. Moreover, the SDCM piles with area ratio (A_(core)/A_(DcM)) of 0-17 and length ratio (A_(core)/A_(DcM)) of 0·85 increased the axial and lateral ultimate bearing capacities so that they were as much as 2·2 and 15 times higher than the corresponding values of DCM piles, respectively. The flexural strength of the DCM pile obtained from the laboratory was 16% of its unconfined compressive strength whereas that obtained from full-scale lateral load tests was much lower at 4-7% of its unconfined compressive strength. The strength reduction factor, R_(inter), at the interface between the concrete core pile and DCM pile in the field averaged 0-40, which agreed with the data from laboratory tests of 0·38-0·46.
机译：对通过硬化的深水泥搅拌（SDCM）桩和通过喷射搅拌安装的深水泥搅拌（DCM）桩进行改进的软曼谷粘土进行了全面的桩荷载测试，以比较其性能。 SDCM桩是DCM桩，中间插入有预制钢筋混凝土芯桩。进行了一系列的全面测试，包括混凝土芯桩与周围DCM材料之间的轴向压缩，横向和拔出界面。混凝土心桩的长度不仅影响截面积，还影响了SDCM桩的极限轴向承载力和沉降。此外，混凝土芯桩的截面积显着影响了SDCM桩的侧向极限承载力和侧向位移。此外，面积比（A_（芯）/ A_（DcM））为0-17，长度比（A_（芯）/ A_（DcM））为0·85的SDCM桩增加了轴向和横向极限承载力，因此它们分别比DCM桩的相应值高2·2和15倍。从实验室获得的DCM桩的抗弯强度为其无侧限抗压强度的16％，而从全尺寸侧向载荷试验获得的抗挠强度则为无侧限抗压强度的4-7％，要低得多。在现场，混凝土芯桩与DCM桩之间的界面处的强度折减系数R_（inter）平均为0-40，与实验室测试的数据0·38-0·46一致。

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