摘要
为研究水泥粉煤灰稳定风积沙碎石用于沙漠公路半刚性基层的可行性,开展室内外试验研究。首先,对水泥粉煤灰稳定风积沙碎石基层混合料开展室内7 d无侧限抗压强度试验;其次,设计全断面掺风积沙、基层掺风积沙、基层与底基层掺风积沙和未掺风积沙的4种路基路面结构形式试验段,将满足要求的风积沙基层混合料应用于试验段,并埋设传感器监测在一个冻融循环过程中各结构内温度、水分、应变、土压力的变化。结果表明:结构层内温度和水分变化与基层风积沙掺量无关;风积沙掺量对基层竖向应变影响大于横向应变;路基土的压力变化受底基层影响大于基层。监测水泥粉煤灰稳定风积沙碎石基层数据可为沙漠公路半刚性基层设计提供理论和应用参考。
In order to study the feasibility of cement fly ash stabilized aeolian sand gravel for semi-rigid base of desert highway,indoor and outdoor experiments were carried out.Firstly,the 7 d unconfined compressive strength test was carried out on the cement fly ash stabilized aeolian sand gravel base mixture.Secondly,the test sections of four kinds of subgrade and pavement structures were designed,which were full-section mixed with aeolian sand,base mixed with aeolian sand,base and subbase mixed with aeolian sand and not mixed with aeolian sand.The aeolian sand base mixture that meets the requirements was applied to the test section,and sensors were buried to monitor the changes of temperature,moisture,strain and soil pressure in each structure during a freeze-thaw cycle.The results show that the temperature and moisture changes in the structural layer have nothing to do with the content of aeolian sand in the base layer;the effect of aeolian sand content on vertical strain of base is greater than transverse strain;the change of subgrade soil pressure is more affected by subbase than base.The monitoring data of cement fly ash stabilized aeolian sand gravel base can provide theoretical and application reference for the design of semi-rigid base of desert highway.
作者
王斌
朱春生
谷晓华
周俊杰
徐晓冬
WANG Bin;ZHU Chunsheng;GU Xiaohua;ZHOU Junjie;XU Xiaodong(School of Transportation and Logistics Engineering,Xinjiang Agricultural University,Urumqi 830052,China;Xinjiang Transport Planning Survey and Design Institute Co.,Ltd.,Urumqi 830006,China;The Third Enginnering Co.,Ltd.of China Railway Seventh Group,Xi’an 710032,China)
出处
《交通科技与经济》
2023年第3期57-63,共7页
Technology & Economy in Areas of Communications
基金
新疆交通设计院科研基金项目(KY2020112301)
2022年度交通运输行业重点科技项目-面上项目(2022-MS4-109)
2022年度交通运输行业科技项目(2022-ZD-007)。
关键词
道路工程
风积沙基层
现场监测
冻融循环
路用性能
road engineering
aeolian sand base
on-site monitoring
freeze-thaw cycle
road performance
