冻融循环作用下不同路基材料力学特性对比研究  

Comparative study on mechanical properties ofdifferent subgrade materials under freeze-thaw cycles

作　　者：蒋明学 张立群[1] 马江平 石玉鑫 吴磊 王雅超 李元博 朱晨 李少刚 JIANG Mingxue;ZHANG Liqun;MA Jiangping;SHI Yuxin;WU Lei;WANG Yachao;LI Yuanbo;ZHU Chen;LI Shaogong(Hebei University of Architecture,Zhangjiakou,Hebei 075000;Zhangjiakou Tongtai Holding Group Co.,Ltd.,Zhangjiakou,Hebei 075000)

机构地区：[1]河北建筑工程学院,河北张家口075000 [2]张家口通泰控股集团有限公司,河北张家口075000

出　　处：《河北建筑工程学院学报》2024年第1期50-57,共8页Journal of Hebei Institute of Architecture and Civil Engineering

摘　　要：为探究寒区路基新型材料泡沫轻质土强度特性,完成了不同湿密度下的泡沫轻质土路基的冻融强度损伤试验。并将新型路基材料泡沫轻质土和传统路基材料水泥改良土进行对比发现:水泥改良土在冻融前期强度会大幅下降,但是在冻融循环5次左右,抗压强度会有回升趋势;而泡沫土从冻融开始到结束始终随冻融循环次数增加抗压强度缓慢下降。强度损失方面,2种路基材料的强度损失速率不同,水泥改良土抗压强度下降速率比泡沫轻质土更快。泡沫轻质土损失率随循环次数变化波动较小,相较为稳定。冻融循环对水泥改良土损失率影响离散型较大。In order to explore the strength characteristics of foamed light soil,a new type of roadbed material,the freeze-thaw strength damage test of foamed light soil roadbed under different wet densities was completed.By comparing the new foamed light soil with the traditional cement improved soil,it is found that the strength of the cement improved soil will decrease greatly in the early freeze-thaw stage,but the compressive strength will rise after about 5 freeze-thaw cycles.The compressive strength of foamed soil decreases slowly with the increase of freeze-thaw cycles from the beginning to the end.In terms of strength loss,the strength loss rate of the two subgrade materials is different,and the compressive strength decline rate of the cement-improved soil is faster than that of the foamed light soil.The loss rate of foamed light soil fluctuates little with the number of cycles,and the phase is relatively stable.The freeze-thaw cycle has a large discrete effect on the loss rate of cement improved soil.

关 键 词：泡沫轻质土 水泥改良土 冻融循环 强度损失率 

分 类 号：U416.1[交通运输工程—道路与铁道工程]