振冲碎石桩的桩距研究

Research of the Pile Spacing of Vibro-macadam Pile

从防止饱和松散粉细砂地基的地震液化出发,研究振冲碎石桩的桩距计算,据振冲桩施工中出现的加固变形和非加固变形新概念,从空间变形条件给出桩距计算的方法。由地基勘察和试桩中测定有关参数,以及引入砂土相对紧密度与孔隙比、标准贯入击数间的关系,使计算方法便于工程设计应用,也提高了计算成果可信度,并以工程实例说明有关测试和计算步骤。

In this paper the computation of the pile spacing of vibro-macadam pile is studied in order to prevent the foundation liquefaction of saturated loose silt-fine sand and caused by the seismic shock.The calculation method of pile spacing is obtained according to the new concept of ＂strengthened deformation＂ and ＂non-strengthened deformation＂ appearing in the engineering and condition of the space deformations,and is easily applied to practical design by using relevant parameters determined in foundation survey and pile test and by introducing the relation between the relative density of silt-fine sand and void ratio,N-value of the standard penetration test（SPT）.In this paper an engineering example is calculated and the computation steps are explained.According to the practice a few conclusions are obtained.