摘要
为解决宁夏地区盐渍土、冻土及湿陷性黄土等不良地质对公路建设的不利影响和粉煤灰、煤矸石大量堆积污染环境的问题,将粉煤灰和煤矸石按照不同比例进行掺和作为路基填料,通过击实试验、膨胀量试验和承载比(CBR)试验,研究其作为路基填料的路用性能。结果表明:当粉煤灰掺比在0%~15%时,混合料的CBR值随粉煤灰掺比增加而增加;当粉煤灰掺比为15%时,混合料的CBR值达到最大值29.32%;当粉煤灰掺比大于15%时,混合料的CBR值随粉煤灰掺比增加呈下降的趋势;粉煤灰、煤矸石混合料的膨胀量随粉煤灰掺比的增加而增大,但远小于膨胀土的膨胀量,满足规范要求。在实际工程应用时,建议粉煤灰、煤矸石混合料中粉煤灰掺比采用15%左右。
The adverse effects of poor geology such as saline soil,permafrost and collapsible loess on highway construction and the environmental pollution caused by the accumulation of fly ash and coal gangue in Ningxia is unignorable.In this paper,the fly ash and coal gangue are mixed according to different proportions as subgrade filling materials.The road performance of subgrade filling material is studied by compaction test,expansion test and CBR test.The test results show that when the fly ash blending ratio is 0%to 15%,the CBR value of the mixture increases with the increase of the fly ash blending ratio,and when the fly ash blending ratio is 15%,the CBR value of the mixture reaches the maximum value of 29.32%.When the fly ash blending ratio is more than 15%,the CBR value of the mixture decreases with the increase of fly ash blending ratio.The expansion amount of fly ash and coal gangue mixture increases with the increase of fly ash ratio,but it is much less than that of expansive soil,which meets the requirements of the specification.In practical engineering application,it is suggested that the fly ash mixing ratio of fly ash and coal gangue mixture is about 15%.
作者
张虎彪
童彧斐
延常玉
华树东
李宏波
ZHANG Hubiao;TONG Yufei;YAN Changyu;HUA Shudong;LI Hongbo(School of Civil Engineering and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Ningxia Huasheng Energy Saving and Environmental Protection Technology Co.,Ltd.,Yinchuan 750004,China;Engineering and Technology of Research Center of Water-Saving Irrigation and Water Resource Regulation in Ningxia,Yinchuan 750021,China;Engineering Research Center Funded by Ministry of Education for Effective Utilization of Modern Agricultural Water Resources in Arid Areas,Yinchuan 750021,China)
出处
《宁夏工程技术》
CAS
2021年第1期54-57,62,共5页
Ningxia Engineering Technology
基金
国家自然科学基金项目(52069025)
宁夏自然科学基金项目(2019AAC03050)
宁夏重点研发计划项目(2020BDE03005)
宁夏高等学校一流学科建设项目(NXYLXK2017A03)。
