涠北管道项目原状土液化性质研究  

Study on liquefaction properties of undisturbed soil in Weibei pipeline project

作　　者：黄雄[1] 李肖 Huang Xiong;Li Xiao(CCCC-FHDI Engineering Co.,Ltd.,Guangzhou 510530,China)

机构地区：[1]中交第四航务工程勘察设计院有限公司,广州510530

出　　处：《工程勘察》2022年第10期43-47,共5页Geotechnical Investigation & Surveying

摘　　要：为调查北海市涠北管道项目土体抗液化特性,基于室内三轴试验,研究了动荷载作用下原状土孔隙水压力和动应变随循环振次的发展规律,探明了不同深度和不同钻孔位置土层的抗液化能力。研究结果表明:原状土循环振次随着施加的动应力增大而减少,动应力较大原状土试样越容易液化破坏;原状土孔隙水压力在小应变范围内随应变增长变化幅值较小,当应变超过一定值时孔隙水压力幅值快速增大直至达到围压水平,此时原状土发生液化,丧失承载能力;通过对比不同深度土层液化结果发现,较深土层具有较强的抗液化能力。本研究结果可以为现场勘查和抗震设计提供参考数据。In order to investigate the anti-liquefaction characteristics of the soil in Weibei pipeline project in Beihai, based on the indoor triaxial tests, the pore water pressure and the dynamic strain of the undisturbed soil under the action of dynamic loads are studied, and the anti-liquefaction ability of the soil layer at different depths and different drilling positions is proved. The study results show that the cycles of the undisturbed soil decreases with the increase of the applied dynamic stress, and the greater the dynamic stress is, the easier the sample is to liquefy;the pore water pressure of the undisturbed soil increases slightly with the strain within the small strain range, and when the strain exceeds the fixed value the pore water pressure rapidly increases and reaches the surrounding pressure level, at which time the undisturbed soil liquefaction occurs and the bearing capacity is lost;through the comparison of the liquefaction results from different depths, it is found that the deep soil is of strong anti-liquefaction ability. The study results could provide the reference data for site survey and seismic design.

关 键 词：原状土 液化 循环应力比 孔隙水压力 动强度 

分 类 号：TU411.8[建筑科学—岩土工程]