不同填筑材料对公路路堤热稳定性影响的数值分析  

Numerical Analysis of the Influence of Different Filling Materials on the Thermal Stability of Highway Embankments

作　　者：白金泉 郑春明 白璐 李杰 BAI Jin-quan;ZHENG Chun-ming;BAI Lu;LI Jie

机构地区：[1]兴安盟交通运输局综合保障中心,内蒙古兴安盟137400 [2]内蒙古公路交通投资发展有限公司,内蒙古呼和浩特010000 [3]中交第三公路工程局有限公司,内蒙古兴安盟137400

出　　处：《内蒙古公路与运输》2022年第2期1-4,共4页Highways & Transportation in Inner Mongolia

摘　　要：为了对比分析块石和普通填土作为路堤填筑材料时路堤结构的热稳定性,以S308线伊尔施至柴桥段公路工程作为研究背景,通过数值模拟建立了考虑冰水相变的冻土路基传热模型,计算了项目完成后20年内路基的温度场,给出了两种填筑材料路基结构的地温变化和多年冻土上限变化。结果表明:填筑层为普通填土时,路基下多年冻土上限不断降低,融化夹层范围持续扩大,冻土退化会导致地基土强度降低,破坏路基稳定性;填筑层为块石时,能有效提升多年冻土上限,减小融化夹层范围,提高路基的稳定性。To compare and analyze the thermal stability of subgrade structure when block stone and common fill soil are used as embankment filling materials,the highway project of the S308 line from Yiershi to Chaiqiao in Inner Mongolia was taken as the research background. The heat transfer model of frozen soil subgrade considering ice-water phase transition was established by numerical simulation,the temperature fields of subgrade within 20 years after completion were calculated, and with the ground temperature change and permafrost upper limit change of subgrade structure with two kinds of filling materials were given. The results show that when the filling layer is common filling soil,the upper limit of permafrost under the subgrade is continuously reduced,the range of thawing interlayer is continuously expanded and the degradation of frozen soil will reduce the strength of the foundation soil and destroy the stability of the roadbed. When the filling layer is stone,the upper limit of permafrost is effectively increased,the range of melting interlayer is reduced and the subgrade stability is improved.

关 键 词：东北多年冻土区 高温冻土 数值模拟 热稳定性 

分 类 号：TU470[建筑科学—结构工程]