循环荷载冻融后纤维改性市政路基填料动态特性试验研究
Experimental Study on the Dynamic Characteristics of Municipal Subgrade Packing Modified by Fiber After Cyclic Load Freeze and Thawing
马堃 1吴月磊 1符传邦 1吴育麒1
作者信息
- 1. 中国市政工程中南设计研究总院有限公司,湖北 武汉 430010
- 折叠
摘要
为了研究纤维粘结剂改性市政路基基层填料(MSF)的动态稳定性,本文在冻融循环后的长期循环加载下对市政路基填料进行了动态三轴试验,深入研究累积塑性应变(CPS)和加载周期数(NLC)随不同的纤维质量分数、纤维长度、粘结剂材料添加量和冻融循环而变化的关系.试验结果表明:与未改性的基层填料相比,MSF的抗CPS能力有明显提高;MSF失效所需的动态应力水平随着纤维长度和粘结剂材料添加量的增加而增加,且最佳纤维长度为 12 mm;经过3 次和9次冻融循环后,与未改性填料相比,MSF的动态应力强度分别增加了 1.9倍和 2.4 倍.
Abstract
In order to study the dynamic stability of fiber binder modified municipal subgrade base packing(MSF),in this paper,the dynamic three-axial test is carried out under the long-term cyclic loading after freeze-thaw cycle,and the cumulative plastic strain(CPS)and the number of loading cycles(NLC)vary with fiber content,fiber length,addition of adhesive material and freeze-thaw cycle.The experimental results show that MSF has significantly improved CPS compared with unmodified base packing;the level of dynamic stress required for MSF failure increased with increasing fiber length and addition of binder material,with an optimal fiber length of 12 mm;after three and nine freeze-thaw cycles,the dynamic stress strength of the MSF increased by 1.9 times and 2.4 times compared with the unmodified fillers,respectively.
关键词
市政路基/动态特性/循环荷载/冻融/纤维Key words
municipal roadbed/dynamic characteristics/cyclic load/freezing and thawing/fiber引用本文复制引用
出版年
2024
NETL
NSTL
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