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排水刚性桩抗液化特性数值计算分析

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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.
Numerical Analysis of Liquefaction Resistance Characteristics of Rigid-drainage Piles
To analyze the anti-liquefaction effect of rigid-drainage piles and provide support for practi-cal 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 analy-sis 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 calcula-tion model.(2)The peak value of the excess pore pressure ratio was 0.7 at a distance of one pile diame-ter 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 drain-age 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 vec-tors near the drainage channels all pointed toward the drainage channels,indicating the channels′ effec-tive role in drainage.

rigid-drainage pilenumerical analysisexcess pore pressure ratioanti-liquefaction charac-teristics

杨耀辉、辛公锋、陈育民、张小宁、李文闻

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山东高速集团有限公司创新研究院,山东 济南 250014

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

河海大学土木与交通学院,江苏 南京 210098

山东大学土建与水利学院,山东 济南 250061

常熟理工学院商学院,江苏 常熟 215500

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排水刚性桩 数值计算分析 超孔压比 抗液化特性

国家自然科学基金青年基金项目

52108298

2024

防灾减灾工程学报
中国灾害防御协会 江苏省地震局

防灾减灾工程学报

CSTPCD北大核心
影响因子:0.529
ISSN:1672-2132
年,卷(期):2024.44(5)