低温冻土地区的软土路基蠕变沉降数值分析  

Numerical Analysis of Creep Settlement of Soft Soil Subgrade in Cryogenic Frozen Soil Zone

作　　者：张峰瑞 姜谙男[1] 江宗斌[1] 张立涛 潘健 尹作寅 ZHANG Fengrui;JIANG Annan;JIANG Zongbin;ZHANG Litao;PAN Jian;YIN Zuoyin(Highway and Bridge Institute of Dalian Maritime University,Dalian,Liaoning 116026,China;China Railway Construction Bridge Engineering Bureau First Engineering Co.,Ltd.,Dalian,Liaoning 116033,China)

机构地区：[1]大连海事大学道桥研究所,辽宁大连116026 [2]中铁建大桥工程局集团第一工程有限公司,辽宁大连116033

出　　处：《公路工程》2020年第4期79-84,共6页Highway Engineering

基　　金：国家自然科学基金项目(51678101);中央高校基本科研业务费专项项目(3132014326)。

摘　　要：为了研究低温冻土地区软土路基蠕变变形规律,考虑低温和含水率对软土路基蠕变特性的影响,结合KBurgers-MC模型,建立了软土路基的蠕变损伤本构模型。利用C++语言编写了蠕变损伤模型动态链接库文件,通过FLAC3D软件对东港高速公路软土路基蠕变进行数值计算,计算结果表明:桩长对软土路基蠕变沉降有着重要的影响,增加桩长后软土路基蠕变沉降量、蠕变速率和塑性区明显减小;低温环境下含水状态的路基蠕变沉降值小于干燥状态,然而当含水率超过一定界限时路基会发生冻胀现象,导致蠕变沉降量增大;路基的蠕变速率随着温度的升高逐渐增大。将现场监测与数值计算结果进行比较,验证了数值计算的准确性,研究结果对于北方沿海软土路基蠕变沉降的防治具有指导意义。To study the creep deformation law of soft soil subgrade in cryogenic frozen soil zone, considering the influence of low temperature and water content on the creep characteristics of soft soil subgrade, a creep damage constitutive model of soft soil subgrade was established combined with KBurgers-MC model. The dynamic link library file of creep damage model was programmed adopting the C++language, and the creep of soft soil subgrade of Donggang Freeway was calculated by FLAC3 D software, the results show that: the pile length has an important influence on creep settlement of soft soil subgrade, the creep settlement, creep rate and plastic zone of soft soil subgrade decrease obviously with the increase of pile length. The creep settlement of subgrade in in hydrated state is less than that in dry state at low temperature, however, when the water content exceeds a certain limit, the subgrade will undergo frost heave, increasing creep settlement. The creep rate of subgrade increases gradually with the rise of temperature. Comparing the field monitoring results with the numerical results, the accuracy of the numerical calculation is verified. The results have guiding significance for the prevention of creep settlement of soft soil subgrade in northern coastal areas.

关 键 词：软土路基 蠕变沉降 数值计算 低温 现场监测 

分 类 号：U416.1[交通运输工程—道路与铁道工程]