砂性土路基换填碾压地基处理抗地震液化效果分析  

Analysis of Anti-seismic Liquefaction Effect of Replacement and Rolling Foundation Treatment for Sandy Soil Subgrade

作　　者：宁世凯 谢润泽 李斌 任玉鹏 黄俊杰[3] 贺鑫 NING Shikai;XIE Runze;LI Bin;REN Yupeng;HUANG Junjie;HE Xin(China Railway Construction Bridge Engineering Bureau Group Co.,Ltd.,Tianjin 300300,China;China Railway Lanzhou Bureau Group Co.,Ltd.,Lanzhou 730015,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中国铁建大桥工程局集团有限公司,天津300300 [2]中国铁路兰州局集团有限公司,兰州730015 [3]西南交通大学土木工程学院,成都610031

出　　处：《路基工程》2025年第1期206-212,共7页Subgrade Engineering

摘　　要：为掌握浅水位砂性土地基地震动力响应规律及换填处理对地震液化的控制效果,基于包银铁路某试验段,采用某典型有限差分数值计算软件进行分析。结果表明:在地震作用下砂性土地基竖向变形发生在路基填筑范围,水平位移发生在路基坡脚处,位移值随地震波加速度峰值增加而增加;在相同加速度峰值地震波作用下,随着深度的增加孔压比增长幅值随之减小,而孔隙水压力增长幅值随之增加;换填碾压处理能减少地震作用引起的变形,提升砂性土地基抗液化能力,随着换填深度的增加,孔压比与孔隙水压的增长幅度随之减小,孔压消散越容易。In order to grasp the seismic dynamic response law of sandy soil foundation at shallow water level and the control effect of replacement treatment on seismic liquefaction,a typical finite difference numerical calculation software was used to analyze based on a test section of Baotou-Yinchuan High-speed Railway.The results show that under the action of earthquake,the vertical deformation of sandy soil foundation occurs in the range of subgrade filling,the horizontal displacement occurs at the foot of subgrade slope.The displacement value increases with the increase of the peak acceleration of seismic wave.Under the same peak acceleration seismic wave,with the increase of depth,the increase amplitude of pore pressure ratio decreases,while the increase amplitude of pore water pressure increases.The replacement rolling treatment can reduce the deformation caused by the earthquake and improve the liquefaction resistance of sandy soil foundation.With the increase of replacement depth,the growth rate of pore pressure ratio and pore water pressure decreases,and the pore pressure dissipation is easier.

关 键 词：铁路路基 砂性土 浅水位地基 地震作用 数值模拟 动力响应 换填碾压 

分 类 号：TU441.4[建筑科学—岩土工程]