嵌岩桩极限侧阻力研究

Study on Ultimate Resistance of Rock-socket Pile

根据嵌岩灌注桩中嵌岩段的受力特点,推导了嵌岩段的法向应力计算公式,以此为基础,采用Hoek Brown准则研究了嵌岩段的极限侧阻力计算问题,讨论了各因素对极限侧阻力的影响。结果表明:嵌岩段极限侧阻力随单桩轴力增大而增大;嵌岩段极限侧阻力与岩体质量等级有关;嵌岩段极限侧阻力与嵌岩桩相对刚度呈正相关关系。

Based on the characteristics of rock-socket pile, the normal stress calculation formula of rock-socket section is given. On basis of the formula, the ultimate resistance of rock-socket section is studied using Hoek-Brown criterion and the effect on resistance of correlation factors is discussed. The results show that ultimate resistance of rock-socket pile increase with axial load and it＇s related to quality of rock mass as well as to relative stiffness of rock-socket pile.