不同改性方法对红黏土强度的影响研究  

Study on the Effect of Different Modified Method on Strength of Red Clay

作　　者：王海湘 于冬升 张金团 许胜才[1,2] WANG Haixiang YU Dongsheng ZHANG Jintuan XU Shengcai(College of Architectural Engineering, Hezhou University, Hezhou, Guangxi 542899, China College of Civil Engineering and Architecture, Guangxi University, Nanning, Guangxi 530004, China)

机构地区：[1]贺州学院建筑工程学院,广西贺州542899 [2]广西大学土木建筑工程学院,广西南宁530004

出　　处：《施工技术》2017年第20期120-124,共5页Construction Technology

基　　金：广西壮族自治区中青年教师基础能力提升项目(KY2016LX376);广西高校人文社会科学重点研究基地-南岭走廊族群文化研究基地开放基金项目(2016kf15);贺州学院自然科学基金项目(2015ZZZK08)

摘　　要：为了探究不同改性方法对红黏土强度的影响,特以红黏土为原材料,以碳酸钙粉末为改性材料,以3种不同方式制备试验样品,开展抗剪强度和无侧限抗压强度等指标试验。结果表明:不同改性方法对红黏土强度的影响较大,将天然红黏土风干后再掺料改性的方法比直接掺料改性或烘干后再掺料改性的效果更好,前者抗剪强度和无侧限抗压强度值明显比后两者强;相比之下,天然红黏土风干后掺料改性的做法更符合实际,虽然占用一定的时间和空间,但其能在一定程度上克服团聚效应的影响,同时能够有效提升红黏土强度,是一种较有效的办法;碳酸钙粉末含量达到10%时,风干红黏土改性后的抗剪强度和无侧限抗压强度值最大。To find the effect of different modified methods on strength of red clay,using red clay as the raw material and Ca CO3 powder as the modified material to make three different test samples,the direct shear and unconfined compression strength index test is carried out. The results show that there is a great influence of different modified methods on strength of red clay,the method which admix modified nature red clay after it was air-dried has better effects than the method which just admix modified red clay or admix modified red clay after drying it,the shear strength and unconfined compressive strength of the former one is apparently better than the latter two. In contrast,the way which adimix modified nature red clay after it is air-dried is more factual,although it takes a certain amount of time and space,to some extent,it can overcome the clustering effect,it also can effectively improve the strength of the red clay,it is a more efficient way. The shear strength and unconfined compressive strength of the modified and airdried red clay are the largest value when Ca CO3 powder content reaches 10%.

关 键 词：红黏土 改良 团聚体 抗剪强度 无侧限抗压强度 

分 类 号：TU411[建筑科学—岩土工程]