高寒地区河道堤防土体材料冻融特性影响因素及冻融强度试验研究  

Experimental study on influencing factors of freezing-thawing characteristics and freezing-thawing strength for soil material of river embankment in alpine region

作　　者：姚治国 YAO Zhiguo(Xinjiang Ruixiang Agriculture and Animal Husbandry Engineering Consultation and Design Institute Limited Company,Urumqi 830000,China)

机构地区：[1]新疆瑞祥农牧工程咨询设计院有限公司,新疆乌鲁木齐830000

出　　处：《水利科学与寒区工程》2020年第4期40-46,共7页Hydro Science And Cold Zone Engineering

摘　　要：针对某高寒地区内陆河堤防工程土体材料,借助土体渗透测试仪与GDS三轴试验机,设计开展冻融试验与三轴强度测试试验,获得了土体冻融特性与冻融强度特征。研究表明冻融试验中温度随时间变化为“U”型,孔隙系统状态对温度传递影响较弱,在封闭或开放系统中土层冻胀高度均为45 cm;开放系统中,冻胀高度以下土层含水量相比封闭式系统有所增大,高度105 cm处增大幅度约为16.7%。分析得出低温温度影响土层冻胀高度线,温度-28℃下位于60 cm,升温时间亦有所滞后;初始含水量增大,冻胀高度线不变,但冻胀高度线以上土层温度下降持续时长延长。含水量、低温槽冻结温度均与峰值应力呈正相关,其他参数相同下含水量12%峰值偏应力相比含水量8%增长了9.5%,冻结温度-10℃峰值偏应力相比-3℃增大了80.4%,冻结温度增大会促进土体变形趋于脆性特征;含水量增大,会提高抗剪参数值。论文为高寒地区堤防工程中土体材料的冻融特性及强度特征研究提供一定参考。The freeze-thaw test and triaxial strength test were designed and carried out for the soil material of an inland river embankment project in alpine area by soil permeability tester and GDS triaxial tester,and the freeze-thaw and strength characteristics of soil were obtained.In the freeze-thaw test,the temperature varies with time in a U-shaped,and the pore system has a weak influence on the temperature transfer.In closed or open system,the frozen-heave height of the soil is 45 cm;and the water content of the soil below the frozen-heave height in open system is higher than that in closed system,the amplification is about 16.7%at the height of 105 cm.The influence of low temperature on the frozen-heave height line of soil is analyzed,the frozen-heave height is 60 cm when the temperature is blow-28℃and the heating-up time is also lagged behind;the frozen-heave height remains unchanged with the increases of the initial soil water content,but the duration of temperature reduction in the soil above the frozen-heave height line was extended.The water content and the freezing temperature of the cryogenic trough are positively correlated with the peak stress.The peak deviatoric stress at 12%water content increases by 9.5%than that 8%water content and the peak deviatoric stress at-10℃freezing temperature increases by 80.4%than that-3℃freezing temperature under the circumstance of other parameters being the same,and the increase of freezing temperature will promote the deformation of soil tends be brittle;with the increase of water content,the shear strength parameters of soil will be improved.This paper provides some references for the study on freeze-thaw characteristics and strength characteristics for soil material of the embankment project in alpine region.

关 键 词：河道 堤防工程 土体 冻融特性 强度特征 

分 类 号：TV871[水利工程—水利水电工程]