摘要
为改善作为路基材料的膨胀土的岩土性能和稳定性,采用塑料垃圾作为土体加固单元,在冻融循环条件下研究了聚对苯二甲酸乙二醇酯(PET)塑料对膨胀黏土的加固特性。通过三轴重复荷载试验和无侧限抗压强度试验等力学试验,研究了膨胀土添加不同含量的PET塑料(干土质量比0%、1%、2%和3%)在多次(0、3、6和9次)冻融循环作用下的力学性能。试验结果表明:(1)在膨胀土中加入PET塑料可降低土的最佳含水率和最大干密度;(2)与不含PET的试样相比,掺入1%PET塑料可以有效提高膨胀土的强度和刚度,且有助于减小膨胀土破坏时裂纹的尺寸和深度;(3)与不含PET的试样相比,掺入PET塑料的试样在抵抗冻融循环的负面影响上表现出更强的能力。
In order to improve the rock and soil properties and stability of expansive soil as roadbed material.The effect of Polyethylene Terephthalate(PET)plastics on the strength of expansive clay was studied under freeze-thaw cycles.Through mechanical tests such as triaxial repeated loading test and unconfined compressive strength test,the mechanical properties of expansive soil with different content of PET plastics(0%,1%,2%and 3%of dry soil mass)under freeze-thaw cycles(0,3,6 and 9 times)were studied.The results show that:(1)The best moisture content and the maximum dry density of expansive soil can be reduced by adding PET plastic into expansive soil.(2)Compared with the samples without PET,the strength and stiffness of expansive soil can be improved by adding 1%PET,and the size and depth of crack can be reduced.(3)Samples incorporated with PET plastic showed more ability to resist the negative effect of the freeza-thaw cycle compared to samples without PET.
作者
张立志
ZHANG Lizhi(Datong Branch,Shanxi Highway Bureau,Datong,Shanxi 037006,China)
出处
《黑龙江交通科技》
2024年第9期59-63,68,共6页
Communications Science and Technology Heilongjiang
关键词
路基填料
PET塑料
膨胀黏土
岩土性能
冻融循环
subgrade filler
PET plastic
expansive clay
geotechnical properties
freeze-thaw cycle
