[1]邓友生,孟丽青,蔡梦真,等.水泥土搅拌桩加固黄土路基稳定性研究[J].郑州大学学报(工学版),2022,43(03):59-66.
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水泥土搅拌桩加固黄土路基稳定性研究()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
43
期数:
2022年03期
页码:
59-66
栏目:
出版日期:
2022-04-10

文章信息/Info

Title:
Study on Rheological and Temperature Sensitive Properties of Recycled Asphalt from Furfural Extraction Oil
作者:
邓友生孟丽青蔡梦真孙雅妮李龙郑云方
文献标志码:
A
摘要:
针对黄土地区降雨入渗条件下路基稳定性问题,采用水泥土搅拌桩作为地基加固处理方法加固黄土路基。以黄土的基础土工试验和不同掺入量的粉煤灰,煤矸石改性水泥土的无侧限抗压强度测试结果作为依据,根据摩尔库伦理论和降雨入渗条件下路基的荷载-沉降原理,采用有限元分析软件ABAQUS构建降雨入渗条件下水泥土搅拌桩处理的路基模型,结合数值模拟结果,分析了水泥土搅拌桩加固黄土路基在不同的降雨时长、降雨强度和桩体弹性模量下黄土路基的荷载-沉降变化规律,讨论了黄土路基的承载特性,探索了降雨入渗对黄土路基稳定性的影响。研究结果表明:水泥土搅拌桩在降雨入渗条件下对黄土路基竖向有着明显的加强作用,路基坡脚的位移会随着降雨强度的增大及降雨时长的增长而增大在降雨强度为2 mm/h,降雨时长为18h的条件下,路面沉降随着桩体弹性模量的增大而减小桩体的弹性模量为300 MPa时,水泥土搅拌桩对黄土路基的加固效果最佳。
Abstract:
In order to find out the regeneration effect of furfural extraction oil as asphalt regeneration agent onasphalt with different aging degrees,the rheological properties and temperature sensitivity of furfural extraction oilrecycled asphalt were studied. By adding furfural extraction oil to asphalt with mild,moderatc and severe agingdegrees , the dynamic shear rheological tests and bending creep tests were used to study the influence of furfuralextraction oil on the rheological properties and temperature sensitivity of aged asphalt , and the rheological propertiesand temperature sensitivity of recycled asphalt were evaluated with different indexes. The results showed that withthe increase of furfural extraction oil content , the middle temperature fatigue resistance and low temperature crackresistance of aging asphalt were improved, and the high temperature deformation resistance was reduced. The per-formances of asphalt with different aging degree could be restored to the level of matrix asphalt under suitable furfu-ral extraction oil content. The multiple stress creep test was more suitable for evaluating the high temperature deformation resistance of asphalt than the rutting factor. The evaluation results of the fatigue factor and linear scan-ning amplitude test on mesothermal fatigue resistance of asphalt were consistent. The temperature sensitivity of re-cycled asphalt had different performance in different temperature ranges. In the temperature range of 46-76C℃.with the increase of furfural extraction oil content , the temperature sensitivity of three kinds of recycled asphalt was enhanced. In the temperature range of -18--6 ℃ , the evaluation results of the creep rate index on the temperaturesensitivity were better than those of the creep stiffness index. Temperature sensitivity of severe aging recycled as-phalt increasted with the increase of furfural extraction oil content,while the temperature sensitivity of mild andmoderate aging recycled asphalt decreased. With the basic recovery of each index to the same as the virgin asphalt ,the optimum content was determined as mild aging 4%,moderate aging 7% ,severe aging 8%.
更新日期/Last Update: 2022-05-02