软岩嵌岩桩承载性状的研究探讨

Research on load transfer behavior of large diameter soft rock socketed pile

我国华东地区发育着的红色软岩具有与硬岩不同的物理力学性质 ,嵌固于其中的大直径钻孔灌注桩的荷载传递性状也应与硬岩有所不同 ,特别是对大嵌入深度、大吨位的软岩嵌岩桩的研究具有重要的工程实践与理论意义。文章从嵌岩桩的设计理论出发 ,对我国东部泥质软岩上的大直径灌注嵌岩桩的荷载传递性状进行了研究。在分析南京新华大厦桩基工程两根大嵌入深度、大吨位的软岩嵌岩桩静载试桩资料和实测内力数据基础上 ,总结了泥质软岩嵌岩桩的荷载传递特点 ,对现行的软岩嵌岩桩设计理念提出了新的见解 ,并将其成功应用于南京新华大厦的桩基设计中 ,取得了良好的经济效益。

Since the red color soft rock distributed in east China has different physical and mechanical properties with hard rocks, the load transfer behavior of large diameter pile embedded in soft rock should also differ from the behavior in hard rock. It is very meaningful to research soft rock socketed pile, especially the one with big embedded depth and large capacity. Starting from the design theory , the load transfer behavior of large diameter soft rock socketed pile, which is widely used in east China, is researched in the paper. After analyzing the static load in\|situ test and measuring results of the two piles with big embedded depth and large capacity, the load transfer characteristics of soft rock socketed pile is summarized, and a new design opinion is put forward. When the theory was successfully applied to the design of Nanjing Xinhua Tower, favorable benefit was obtained.