多向荷载作用下岩溶区嵌岩桩嵌岩深度计算方法  

Calculation Method of Embedded Depth of Rock⁃Socketed Pile in Karst Area Subjected to Multi⁃directional Load

作　　者：江杰[1,2,3] 赖增任 欧孝夺 王智[4] 杨迪 JIANG Jie;LAI Zengren;OU Xiaoduo;WANG Zhi;YANG Di(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Nanning 530004,China;Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Nanning 530004,China;China Railway Construction Group Co.Ltd.,Beijing 100040,China)

机构地区：[1]广西大学土木建筑工程学院,南宁530004 [2]工程防灾与结构安全教育部重点实验室,南宁530004 [3]广西防灾减灾与工程安全重点实验室,南宁530004 [4]中铁建设集团有限公司,北京100040

出　　处：《铁道建筑》2020年第6期96-100,104,共6页Railway Engineering

基　　金：国家自然科学基金(51568006,51768006);中国博士后科学基金(2017M612865)。

摘　　要：针对多向荷载作用下岩溶桩嵌岩深度研究的不足,基于Hoek-Brown破坏准则和静力平衡原理,研究水平力、弯矩和竖向承载力作用下岩溶区桩基溶洞顶板受力特性,推导出三向荷载共同作用下嵌岩桩嵌岩深度计算公式。通过与规范和工程实例对比分析,证实了方法的实用性。在此基础上探讨了基岩顶面水平力、弯矩、竖向承载力与嵌岩深度之间的关系,三者对嵌岩深度最大值和最小值均有影响。Aming at the insufficiency of research on the depth of rock-socketed karst piles under multi-directional loads,based on the Hoek-Brown failure criterion and static equilibrium principle,the mechanical characteristics of the pile roof in the karst area under the horizontal force,bending moment and vertical bearing capacity were studied,and the formula for calculating the depth of rock-socketed piles under a three-directional load was derived.The practicability of this method was verified by comparison with the specifications and engineering examples.On this basis,the relationship between the horizontal force,bending moment,vertical bearing capacity of the top surface of the bedrock and the depth of rock-socketed was discussed.All of these three factors have an effect on the maximum and minimum embedded depth.

关 键 词：城市桥梁 桩基嵌岩深度 理论分析 Hoek-Brown破坏准则 岩溶 多向荷载 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]