石太客专路基冻胀融沉特性试验与冻害控制措施  

Test on Frost Heaving and Thawing Settlement Characteristics and Freezing Damage Control Measures for Shijiazhuang-Taiyuan Passenger Dedicated Railway Subgrade

作　　者：杨玉伟 YANG Yuwei

机构地区：[1]中国铁路北京局集团有限公司石家庄工务段,河北石家庄050051

出　　处：《铁道技术监督》2023年第6期37-42,共6页Railway Quality Control

摘　　要：为减少路基冻胀和融沉对石太客专的影响,对石太客专路基砂卵石地层冻胀融沉特性开展试验研究。试样取自石太客专路基,测定试样在不同干密度(1.91 g/cm^(3),2.05 g/cm^(3),2.15 g/cm^(3))条件下,饱水砂卵石在开放系统和封闭系统条件下的温度场、冻胀量和融沉量。试验结果表明,砂卵石土冻胀力、冻胀量和融沉量随干密度的增大而减小,冻胀融沉后的砂卵石试样不会回到初始状态;封闭系统中砂卵石试样冻结达到稳态的时间大于开放系统,干密度愈小,砂卵石试样冻结达到稳定的时间愈长。根据石太客专路基砂卵石地层冻胀和融沉特性,采取疏通排水、注盐、增加外保温层、路基注入高分子材料等预防措施,保障石太客专的安全运营。To reduce the influence of frost heaving and thawing settlement of subgrade on Shijiazhuang-Taiyuan Pas⁃senger Dedicated Railway,the frost heaving and thawing settlement characteristics of sandy cravel stratum of the sub⁃grade were studied by experiments.The test sample were taken from Shijiazhuang-Taiyuan Passenger Dedicated Rail⁃way,and the temperature field,frost heaving and thawing settlement amounts of water-saturated sand and cravels were tested and determined under different dry density,such as 1.91 g/cm3,2.05 g/cm3,2.15 g/cm3,in open and closed systems.The results show that the frost heaving force,frost heaving quantity and thawing settlement quantity of sandy cravel soil decrease with the increase of dry density,and the sandy cravels samples after frost heaving and thaw⁃ing settlement will not return to the initial state.The time from freezing to steady state of sandy cravel test sample in the closed system is longer than that in the open system,and the smaller the dry density,the longer the time from freezing to steady state of sandy cravel test sample is.According to the characteristics of frost heaving and thawing set⁃tlement in sandy gravel stratum of Shijiazhuang-Taiyuan Passenger Dedicated Railway subgrade,preventive mea⁃sures such as dredging drainage,salt injection,adding external insulation layer and injecting polymer materials into subgrade are taken to ensure the safe operation of the railway.

关 键 词：石太客运专线 冻土路基 土工试验 融沉 冻胀 干密度 

分 类 号：U213.14-34[交通运输工程—道路与铁道工程]