基于自平衡法的较破碎岩石地基嵌岩桩承载性状研究

The Study of Rock-Socketed Segment Piles' Bearing Behavior on Less Cracked Rock Foundation under Self-Balanced Method

自平衡法作为一种新兴的的桩基载荷试验方法,其具有节约时间、节约资金、操作自动化和不受场地限制等突出优点,目前在国内已经广泛应用于桩基工程中,它适用于多种类型的桩基础。嵌岩桩,由于其单桩承载力高,抗震性能好,沉降小等特点,目前在基础工程中被广泛使用。在贵阳地区,很多嵌岩桩嵌入中等风化、较破碎的岩石中。由于国内目前对于较破碎岩石地基嵌岩桩的研究较少,且《建筑桩基技术规范》(JGJ94-2008)对于如何在此类岩体上进行嵌岩桩的设计未作详尽的说明,给桩基设计带来了一些问题。本文主要以对相关规范的学习及国内学者的研究成果为基础,并结合现场自平衡桩基载荷试验,分析研究在较破碎岩石地基上的嵌岩桩的承载性状。

Self-balanced method is a new pile＇t load test . It has many advantages, it can not only save a lot of time and money, but it also has the test automation, not subject to site conditions. At present, this method has been widely used in pile foundation engineering. This method is well used in many kinds of pile foundation. For the rock-socketed piles have many advantages, they have high bearing capacity of a single pile, a better seismic performance, and a lower settlement, etc. Thatg why they are being widely used in foundation engineering field. In Guiyang area, most of the rock-socketed piles are embedded into the moderate weathered and less cracked rock. However, few academics study has been carried out on this area. Also, the national code Technical code for building pile foundations （JGJ94 -2008 ） didnt make a more detailed statement which brings many problems for designing. This paper will study the related national code and the result of academics in our country. What＇s more, this paper will be based on a in-situ pile foundation load test under self-balanced method to analyze and study the rock-socketed piles＇bearing behavior on less cracked rock