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建筑石膏与胶凝材料
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铁尾矿和水泥改性生土材料抗压试验研究

作者：袁卫宁1，魏佳妮1，张坤2，芦白茹3，渠浩1

关键字：铁,尾矿,和,水泥,改性,生土,材料,抗压,试验,

　
（1.长安大学 建筑工程学院，陕西 西安  710061；2.西安石油大学 博士后创新基地，陕西 西安  710065；3.西安欧亚学院 人居环境学院，陕西 西安  710065）
    摘要：采用铁尾矿及水泥对生土材料进行改性，通过单形格子法设计10组配方，并以生土试件作为对照组，研究了各组试件的破坏形态、抗压强度、变形及应力-应变曲线，分析了试件破坏的原因，以及改性材料掺量对强度、离散性及应力-应变曲线的影响。结果表明：各组试件的应力-应变曲线变化规律基本相似，同时曲线的斜率、离散性又显示出差异性。增加铁尾矿和水泥掺量均能提高生土材料的抗压强度，同时材料的离散性也会随之增大。通过频数分析法得到：铁尾矿掺量为12.1%~19.5%、水泥掺量为13.9%~19.1%、生土掺量为65.5%~69.9%时，铁尾矿和水泥改性生土材料的抗压强度有95%保证率处于6~9 MPa之间。
    关键词：铁尾矿；改性生土材料；抗压试验；单形格子；频数分析法
    中图分类号：TU521.3        文献标识码：A        文章编号：1001-702X（2022）09-0132-07
 
Experimental study on compressive strength of raw soil modified by iron tailings and cement
YUAN Weining1，WEI Jiani1，ZHANG Kun2，LU Bairu3，QU Hao1
（1.School of Civil Engineering，Chang'an University，Xi'an 710061，China；
2.Postdoctoral Innovation Base，Xi'an Shiyou University，Xi'an 710065，China；
3.School of Human Settlements and Civil Engineering，Xi'an Eurasia University，Xi'an 710065，China）
    Abstract：Iron tailing and cement were used to modify the raw soil，10 groups of formula were designed by using the simplex lattice formula design method. Using the raw soil samples as the control group，the damage patterns，compressive strength，deformation and stress-strain curve of the new material of each group of specimens were investigated，and the reasons for the failure of the specimens，as well as the influence law of modified material content on strength，discreteness and stress-strain curves were analyzed. The test results showed that the variation law of stress-strain curves obtained from each designed formula were similar，while the slope and discreteness of the curves were different. The increase of iron tailings and cement could improve the compressive strength of the raw soil material as well as its dispersion. Frequency analysis revealed that the compressive strength of the enhanced raw soil material reached a value between 6 MPa and 9 MPa with a 95% guarantee rate when the content of iron tailings，cement and raw soil set at 12.1%~19.5%，13.9%~19.1% and 65.5%~69.9%，respectively.
    Key words：iron tailings，modified raw soil material，compression test，simplex lattice，frequency analysis