合黎山天然风化砂改良硫酸盐渍土强度特性试验研究  

Strength Properties of Saline Soil Improved by Weathered Sand in Heli Mountain

作　　者：秦虎 贾剑青[2] 张亚兵 张红娟 李鸿 QIN Hu;JIA Jianqing;ZHANG Yabing;ZHANG Hongjuan;LI Hong(School o f Civil Engineering, He Xi University,Zhangye,Gansu 734000, China;School of Traffic and Transportation,Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China)

机构地区：[1]河西学院土木工程学院,甘肃张掖734000 [2]兰州交通大学交通运输学院,甘肃兰州730070

出　　处：《水利与建筑工程学报》2018年第2期95-98,共4页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目(51104081);甘肃省自然科学基金项目(1508RJZA106);兰州交通大学"百名青年优秀人才培养计划"基金资助项目;河西学院第七批大学生科技立项项目

摘　　要：针对硫酸盐渍土掺入风化砂改良的理论研究不足,采用无侧限抗压强度和间接拉伸强度试验,研究了合黎山天然风化砂掺入量对硫酸盐渍土强度特性的改良效果,在0.5%、1.0%、1.5%、2.0%、3.0%的硫酸盐渍土中掺入0%、10%、20%、30%、40%、50%的合黎山天然风化砂进行了改良硫酸盐渍土的强度特性对比试验,探讨了合黎山天然风化砂改良硫酸盐渍土的可行性及最优掺量比。试验结果表明:适量掺入合黎山天然风化砂能够改良硫酸盐渍土的强度特性,随着合黎山天然风化砂掺入量的增加,改良硫酸盐渍土的无侧限抗压强度和间接抗拉强度均出现先增大后减小的规律,采用三次函数可较好描述无侧限抗压强度与风化砂掺入量间关系,采用二次函数可较好描述间接拉伸强度与风化砂掺入量间关系,试验条件下合黎山天然风化砂改良硫酸盐渍土强度特性的最优掺量比为20%。Aimed at the theory deficiency of sulphate saline soil mixed with weathered sand,the comparison test of strength properties were carried out on the salt content was 0.5%,1.0%,1.5%,2.0%,3.0%of saline soil,which mixed with 0%,10%,20%,30%,40%,50% of natural weathered sand in Heli mountain.In this paper,the feasibility and optimum ratio of the natural weathered sand were also discussed.The experimental results show that the strength characteristics of sulphate salty soil can be improved by adding appropriate natural weathered sand,with the increasing of the amount of natural weathered sand,the unconfined compressive strength and indirect tensile strength of the sulphate salty soil were both present the regularity of increases at first and then decreases.There was a cubic function relation between unconfined compressive strength and the amount of weathered sand.The quadratic function nexus is indirect tensile strength and the amount of weathered sand.The optimum ratio of the strength characteristics is 20%,which is related to the natural weathered sand and the improvement of sulfate saline soil under the experimental conditions.

关 键 词：硫酸盐渍土 风化砂 无侧限抗压强度 间接拉伸强度 最优掺量比 

分 类 号：TU411[建筑科学—岩土工程]