水泥硅微粉改良黄土的抗剪强度试验研究  

Experimental Research on Shear Strength of Improved Loess with Cement and Silicon Micropowder

作　　者：葛菲 巨玉文[1] 蒋宗耀 张伟龙 GE Fei;JU Yu-wen;JIANG Zong-yao;ZHANG Wei-long(Architecture and Civil Engineering College, Taiyuan University of Technology, Taiyuan 030024, China)

机构地区：[1]太原理工大学建筑与土木工程学院,太原030024

出　　处：《科学技术与工程》2020年第16期6565-6569,共5页Science Technology and Engineering

基　　金：国家自然科学基金(51178287)。

摘　　要：通过对山西太原郊区某工业园区的黄土中掺入水泥、硅微粉作为固化材料进行黄土改良,对不同掺量,不同龄期等变化因素条件下改良后的黄土进行直接剪切强度试验,分析了水泥和硅微粉改善黄土抗剪强度指标的变化特征。研究结果表明:硅微粉加入水泥土中可有效提高水泥土的抗剪强度;两种材料同时添加的效果要优于单独掺加一种材料改良处理黄土的效果;硅微粉掺入比为10%时,改良土的强度提高最为明显;随着养护龄期的增加,水泥、硅微粉双掺改良黄土黏聚力不断增加,内摩擦角则持续递减但幅度较小,改良土的变形能力减小。Through the improvement of loess with cement and silica powder as solidifying materials,the loess in an industrial park in the suburb of Taiyuan,Shanxi Province was studied.Direct shear tests were carried out on the improved loess with different dosage and age.The shear strength of loess was measured under different vertical stresses,and the change characteristics of shear strength index of loess improved by cement and silicon powder were analyzed.The results show that the shear strength of cement-soil can be effectively improved by adding silica powder into cement-soil.The effect of improving loess of adding two materials at the same time is better than adding one.When the ratio of silica powder is 10%,the strength of the improved soil is most obvious.With the increase of curing age,the cohesion of both cement and silicon adding modified loess increase.The internal friction angle decreases continuously,but the deformation capacity of the improved loess decreases slightly.

关 键 词：黄土 硅微粉 水泥 抗剪强度 

分 类 号：TU411[建筑科学—岩土工程]