工业碱渣改良云南典型膨胀土的膨胀特性试验  

Experiment of swelling properties of improved typical expansive soil in Yunnan by industrial alkali residue

作　　者：孙孝海 谢建斌 陈伟 赵一锦 江胜 刘道炎 SUN Xiaohai;XIE Jianbin;CHEN Wei;ZHAO Yiji;JIANG Sheng;LIU Daoyan(College of Architecture and Planning,Yunnan University,Kunming,Yunnan 650000,China;China Railway Tunnel Group Co.,Ltd.,Sanhe,Hebei 065200,China)

机构地区：[1]云南大学建筑与规划学院,云南昆明650000 [2]中铁隧道集团二处有限公司,河北三河065200

出　　处：《江苏大学学报（自然科学版）》2020年第5期615-620,共6页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(11862024,51264037)。

摘　　要：通过室内试验,对工业碱渣改良云南蒙自地区典型膨胀土进行研究,探讨不同掺量的水泥、工业碱渣、水泥+工业碱渣混合料条件下,膨胀土的膨胀特性.试验结果表明:水泥、工业碱渣、水泥+工业碱渣混合料均可降低素膨胀土的自由膨胀率,工业碱渣改性土最小膨胀率为水泥的0.77倍;当工业碱渣、水泥及水泥+工业碱渣混合料的改性膨胀土中的工业碱渣和水泥掺量分别超过30%和6%后,胀缩位移曲线基本重合;工业碱渣和水泥的最佳掺量分别为30%和6%,此时,工业碱渣改性土的最小膨胀力仅为水泥改性土的0.33倍,为素膨胀土的0.05倍;使膨胀土黏聚力和内摩擦角最优的工业碱渣掺量为30%~40%.The laboratory test was used to study the typical expansive soil in Mengzi area of Yunnan Province improved by industrial alkali residue.The effects of cement amount,industrial alkali residue amount and cement-industry alkali residue amount on the expansion characteristics of expansive soil were investigated.The test results show that industrial alkali residue,cement and cement-industry alkali residue can all reduce the free expansion rate of pure expansive soil.The minimum expansion rate of industrial alkali residue modified soil is 0.77 times of that of cement.When the modified expansive soil admixture ratio of industrial alkali residue and cement are respectively more than 30%and 6%,the displacement curve of expansion and shrinkage is not change.When the optimum mixing ratios of industrial alkali residue and cement are respective 30%and 6%,the minimum expansion force of industrial alkali residue modified soil is only 0.33 times of that of cement modified soil and 0.05 times of that of pure expansive soil.The optimum ratio of industrial alkali residue admixture to expansive soil cohesion and internal friction angle is from 30%to 40%.

关 键 词：云南典型膨胀土 工业碱渣改良 水泥改良 自由膨胀率 胀缩位移 膨胀力 

分 类 号：TU443[建筑科学—岩土工程]