岩质地基埋入式柱脚独立基础设计研究  

Research on Design of Rock-socketed Independent Column Foundation

作　　者：王子全 刘京安 Wang Ziquan;Liu Jing’an(Chongqing CISDI Engineering Consulting Co.,Ltd.,400013,China)

机构地区：[1]重庆赛迪工程咨询有限公司,400013

出　　处：《特种结构》2023年第1期99-105,共7页Special Structures

摘　　要：西南山地岩质地基大量采用人工操作水钻开挖成槽的原槽浇筑独立基础。本文总结埋入式柱脚埋入深度的相关规定,更新并拓展岩质地基嵌岩独立基础嵌固深度计算公式,并比较满足嵌岩深度要求的矩形独立基础与圆形独立基础。研究表明,当柱脚弯矩和剪力较小时,埋入深度须满足构造要求;当柱脚弯矩和剪力较大且承压面较小时,须计算确定埋入深度;重大项目、高烈度区项目,还应根据柱的极限承载力验算其埋入深度。岩质地基独立基础嵌岩深度与承压面压力分布有关,统一了不同压力分布下嵌岩深度计算公式。埋入式柱脚独立基础满足设计可不考虑弯矩及剪力的影响,圆形独基与方形独基的嵌岩深度比值不超过1.1,将嵌岩独基设计成圆形具有机械成槽的效率优势,在西南山地建筑中,有较好的应用推广价值。In the southwest rocky mountain area,many rectangular independent foundations is excavated by water drilling through manual operation.In this paper,the regulations on the embedded depth of column foundations are summarized;the formula for calculating the embedded depth of independent rock-socketed foundations is updated and expanded;and the rectangular independent foundations and circular independent foundations that meet the requirements of rock-socketed depth are compared.Research shows that when the bending moment and shear force at the column foundation are small,the embedded depth must meet the structural requirements;when the bending moment and shear force are large and the bearing surface is small,the embedded depth must be calculated;for foundations at seismic high-intensity area,the embedded depth shall also be checked according to the column ultimate bearing capacities.The rock-socketed depth of independent column foundation is related to the pressure distribution of bearing surface and the calculation formula shall consider different pressure distributions.When the design meets the rock-socketed depth,the influence of bending moment and shear force is not considered.When the ratio of circular foundation to square foundation is not greater than1.1,the circular shape design has the advantage of mechanical trenching efficiency.This study has a better application in the southwest rocky mountain area.

关 键 词：岩质地基 埋入式柱脚 埋入深度 嵌岩深度 圆形独基 

分 类 号：TU470[建筑科学—结构工程]