铁道标准设计2018，Vol.62Issue(3)：6-12,7.DOI:10.13238/j.issn.1004-2954.201705020001
蒙辽客运专线粉砂地基固结压缩特性的三轴试验研究
Tri-axial Test Study of the Consolidation and Compressibility of Silty Sand in Mongolia~Liaoning Dedicated Passenger Railway
摘要
Abstract
Based on the subgrade engineering of the new Tongliao to Xinmin North Station of Beijing-Shenyang High Speed Railway,a series of in-house tri-axial tests under the condition of consolidation and non-drainage are carried out to study the stress-strain relationship and the development law of the pore water pressure of the medium dense silty sand with 10%, 15%, 30% and 40% of fine particles. The influences of different fine particle contents on the developing characteristics of pore water pressure of the medium dense silty sand under different confining pressures are demonstrated. The experimental results show that, the stress and strain curve of the medium dense silty sand under the condition of spatial stress tends to show a strong hardening state with the increase of the confining pressure and in a weak hardening state with the increase of the fine article content. Along with the development of shear,the variation of pore water pressure increases firstly and then drops after the peak value is reached. In addition,with the increase of the fine particle content and confining pressure,the peak pore pressure increases and the dissipation rate of pore water pressure decreases showing a trend of delay and greater residual pore pressure; the initial shear modulus is positively correlated to the confining pressure and increases with the increase of confining pressure. Meanwhile, the authenticity and reliability of the above experimental results are proved by using a computer model test base on finite analytical procedure ABAQUS.关键词
客运专线铁路/路基/中密粉砂/应力-应变关系/孔隙水压力/细粒含量/围压/初始剪切模量Key words
Dedicated passenger railway/Subgrade/Medium dense silty sand/Stress-strain relationship/Pore water pressure/Fine particle content/Confining pressure/Initial shear modulus分类
交通工程引用本文复制引用
王武刚,宋华冠,宋绪国,许再良,陶美祥,刘建勋..蒙辽客运专线粉砂地基固结压缩特性的三轴试验研究[J].铁道标准设计,2018,62(3):6-12,7.基金项目
中国铁路设计集团有限公司博士后科研课题(7216116) （7216116）
