摘要
利用宁夏平罗县姚伏的超盐渍土,分别掺入5%、10%、15%、20%、25%、30%的粉煤灰进行固化改良,通过三轴试验,研究7d和28d龄期压实系数为90%、93%、96%固化盐渍土的抗剪强度;定性观察分析365d龄期的固化超盐渍土的耐久性.结果表明：当粉煤灰掺量在0-10%时,黏聚力增加显著;当粉煤灰掺量在10%-30%时,黏聚力增加缓慢.当粉煤灰掺量在0-15%时,摩擦角增加缓慢;当粉煤灰掺量在15%-30%时,摩擦角增加显著.7d与28d龄期固化超盐渍土相比较：当粉煤灰掺量在15%以内时,随着龄期的增加黏聚力和摩擦角有小幅波动变化;当粉煤灰掺量在15%以上时,随着龄期的增加黏聚力有增加的趋势,而摩擦角有降低的趋势.建议利用粉煤灰固化超盐渍土时,最佳掺量控制在10%-15%.365d龄期的各组固化盐渍土均处于松散状态,因此,利用粉煤灰固化超盐渍土需进一步研究改善其耐久性.
Yaofu hypersaline soil at Ningxia Pingluo county was mixed with 5%,10%,15%,20%,25%,and 30%fly ash respectively to solidify and improve this saline soil.By means of triaxial test,its shear strength after 7dand 28 dageing that the compaction coefficient was 90%,93%,96% was investigated and its durability after 365 dageing was qualitatively observed and analyzed,The results showed that when the dosage of fly ash was 0to 10%,the cohesion would increase significantly.When dosage of fly ash was 10%to 30%,the increase of the cohesion would be slow.When the dosage of fly ash was 0to15%,the friction angle would increase slowly,and as the dosage of fly ash was 15%to 30%,the increase of the friction angle would be significantly.Comparing 28 dwith 7dageing overweight saline soil,several interesting conclusions were obtained：when the dosage of fly ash was less than 15%,the cohesion and friction angle would vary little with the increase of ageing time;when dosage of fly ash was above 15%,the cohesion would increase with ageing time,and the friction angle would decrease with ageing time.The optimal dosage of fly ash would be 10%to 15%to solidify the overweight saline soil.All groups of fly ash solidified saline soil would be in loose state,so the use of fly ash for solidification of saline soil needs to be studied further to improve its durability.
出处
《兰州理工大学学报》
CAS
北大核心
2015年第3期140-144,共5页
Journal of Lanzhou University of Technology
基金
宁夏自然科学基金(NZ13024)
国家十二五科技支撑计划项目(2013BAJ03B01)
宁夏回族自治区科技支撑计划项目(2012ZYS264)
关键词
超盐渍土
粉煤灰
抗剪强度
耐久性
hypersaline soil
fly ash
shearing strength
durability
作者简介
李宏波（1977～），男，陕西蓝田人，硕士，讲师．
