排水刚性桩抗液化特性数值计算分析  

Numerical Analysis of Liquefaction Resistance Characteristics of Rigid-drainage Piles

作　　者：杨耀辉 辛公锋 陈育民[2,3] 张小宁 李文闻 YANG Yaohui;XIN Gongfeng;CHEN Yumin;ZHANG Xiaoning;LI Wenwen(Shandong Hi-Speed Group Innovation Research Institute,Jinan 250014,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;School of Civil Engineering,Shan-dong University,Jinan 250061,China;Business School,Changshu institute of technology,Changshu 215500,China)

机构地区：[1]山东高速集团有限公司创新研究院,山东济南250014 [2]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [3]河海大学土木与交通学院,江苏南京210098 [4]山东大学土建与水利学院,山东济南250061 [5]常熟理工学院商学院,江苏常熟215500

出　　处：《防灾减灾工程学报》2024年第5期1177-1183,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金青年基金项目(52108298)资助。

摘　　要：为分析排水刚性桩的抗液化作用效果,开展了排水刚性桩的数值计算模拟,基于振动台试验实测结果验证了计算模型的可靠性,针对设置不同排水通道数量的排水桩桩周超孔压比、超孔隙水渗流特性等进行了计算分析。结果表明:①试验实测值与数值模拟结果吻合较好,证明了计算模型的可靠性和合理性;②桩身1倍桩径处超孔压比峰值为0.7,1.5倍桩径处为1.0,排水刚性桩的有效作用范围在桩周1倍桩径左右;③单侧排水通道排水桩影响范围为以桩心为圆心、1倍桩径为半径的近似半圆,双侧和四侧排水通道排水桩影响范围为与单侧排水通道圆心和半径相同的整圆,排水体附近渗流矢量均指向排水通道,表明了排水通道发挥了有效的排水作用。To analyze the anti-liquefaction effect of rigid-drainage piles and provide support for practical engineering applications,a numerical simulation analysis of rigid-drainage piles was performed.The reliability of the model was validated based on the measured values from model tests.The analysis focused on excess pore pressure ratio and pore water seepage characteristics around rigid-drainage piles with varying numbers of drainage channels.The results showed that:(1)The measured values closely matched the numerical simulation results,confirming the reliability and accuracy of the calculation model.(2)The peak value of the excess pore pressure ratio was 0.7 at a distance of one pile diameter from the pile,and 1.0 at a distance of 1.5 times the pile diameter,indicating that the effective range of the rigid-drainage pile was approximately one pile diameter.(3)The influence range of drainage piles with a single drainage channel formed an approximate semi-circle with the pile center as the origin and a radius of one pile diameter.For piles with double-sided and four-sided drainage channels,the influence range formed a full circle with the same center and radius.Additionally,the seepage vectors near the drainage channels all pointed toward the drainage channels,indicating the channels'effective role in drainage.

关 键 词：排水刚性桩 数值计算分析 超孔压比 抗液化特性 

分 类 号：TU473.1[建筑科学—结构工程]