摘要
为改善生土材料的力学性能,本研究以铁尾矿、煤矸石、电石渣、油泥与水泥等材料作为掺和料对生土进行改性。基于单形格子法设计配方,对3种配方、180个改性生土试件进行抗压强度试验,研究不同因素对试件破坏形态、抗压强度和试验数据离散性的影响;利用频数分析法,研究了固废改性生土材料的最优配方;通过CT扫描,从细观层面分析受荷后材料内部的分形和孔隙。结果表明:改性生土试件抗压破坏形态基本相同,极限位移受掺料影响显著。以煤矸石与电石渣、铁尾矿与水泥、油泥与水泥作为掺和料均可大幅提高改性生土试件的力学性能,掺和料种类、掺量对改性生土试件强度及数据离散性影响显著。经过频数寻优,3种配方的理想强度掺和料配比分别为1)铁尾矿12.1%~19.5%(质量分数,下同)、水泥13.9%~19.1%、生土65.5%~69.9%;2)电石渣6.7%~14.1%、煤矸石8.9%~11.8%、生土76.7%~81.8%;3)油泥11.4%~14.4%、水泥17.4%~19.4%、生土67.1%~70.5%。材料内部的分形和孔隙特征稳定,表现出较小的波动性和良好的密实性。
In order to improve the mechanical properties of raw soil materials,iron tailings,gangue,calcium carbide slag,oil sludge and cement were used as admixtures to modify raw soil.On the basis of the monomorphic lattice method,the effects of different factors on the failure morphology,compressive strength and data discreteness of the specimen were studied through compressive test of 180 modified raw soil specimens of three modified formulas.Using the frequency analysis method,the optimal formula of solid waste modified raw soil material was studied.Then,the fractal and pore structures inside the loaded material were analyzed at a microscopic level through CT scanning.The results show that the compressive failure forms of different admixture-modified raw soil specimens are basically the same,but the admixture significantly affects the limit displacement.Gangue and calcium carbide slag,iron tailings and cement,oil sludge and cement as raw soil admixtures can greatly improve the mechanical properties of modified raw soil specimens,the type and the amount of admixture have a significant impact on the strength and data discreteness of modified raw soil specimens.After frequency optimization,the ideal strength admixture ratios for the three formulas are 1)iron tailings 12.1%~19.5%(mass fraction,the same below),cement 13.9%~19.1%and raw soil 65.5%~69.9%;2)calcium carbide slag 6.7%~14.1%,coal gangue 8.9%~11.8%and raw soil 76.7%~81.8%;3)oil sludge 11.4%~14.4%,cement 17.4%~19.4%and raw soil 67.1%~70.5%.The fractal and pore characteristics inside the material are stable,exhibiting small fluctuations and good compactness.
作者
张坤
付智勇
张凌寒
杨文豪
兰官奇
朱熹育
ZHANG Kun;FU Zhiyong;ZHANG Linghan;YANG Wenhao;LAN Guanqi;ZHU Xiyu(Civil Engineering College,Xi’an Shiyou University,Xi’an 710065,China;Postdoctoral Innovation Base/Construction of Infrastructure Department,Xi’an Shiyou University,Xi’an 710065,China;Mechanical Engineering College,Xi’an Shiyou University,Xi’an 710065,China)
出处
《硅酸盐通报》
CAS
北大核心
2024年第2期603-616,636,共15页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(52308204)
陕西省自然科学基础研究计划(2022JQ-301)
西安市科技计划(2022JHRYFW-0125)
陕西省重点研发计划(2022GY-431)
研究生创新与实践能力培养计划(YCS23214275)
西安石油大学“立德树人”研究课题(LD202214)。
关键词
改性生土
固废利用
抗压强度
配方设计
频数分析法
modified raw soil
solid waste utilization
compressive strength
formula design
frequency analysis
