摘要
分析外掺纤维对膨胀土边坡水泥基生境基材护坡性能的影响,为膨胀土边坡防护及生态修复提供理论依据。分别外掺聚丙烯纤维、玄武岩纤维和棕纤维制备3种不同的水泥基生境基材,通过边坡模型试验定期测定各边坡生境基材的物理、力学及生态指标。结果表明:①与对照组(CK组)相比,聚丙烯纤维、玄武岩纤维及棕纤维的掺入可显著改善基材的内部孔隙结构,其渗透系数降低范围分别为28.43%~39.39%、5.58%~10.13%、31.36%~43.14%;纤维掺入提高了基材的抗剪强度,其黏聚力提高范围分别为28.37%~32.75%、12.23%~14.82%、32.52%~37.21%,内摩擦角提高范围分别为0.07%~1.62%、0.41%~1.21%、1.31%~2.07%。②纤维的加入通过改善基材的孔隙结构,促进了植物生长,从全期平均含量来看,3组外掺纤维组相较CK组的地下生物量分别提高了26.38%、8.93%、51.06%。③边坡土体在经历自然降雨后,土体含水率随深度的增加而减小,随降雨量的增大而增大,外掺纤维组降雨前后含水率差值明显低于CK组,其作用效果依次为棕纤维>聚丙烯纤维>玄武岩纤维。综合分析得出:外掺纤维对膨胀土边坡水泥基生境基材的护坡性能有明显的提升效果;综合环保及成本因素,棕纤维运用于实际工程更符合可持续发展理念。该研究成果可对膨胀土边坡生态防护提供理论支撑及技术指导,并对其他特殊土边坡生态防护具有借鉴意义。
To analyze the effect of externally doped fibers on the slope protection performance of cementitious habitat substrates for expansive soil slopes,and to provide theoretical basis for the protection and ecological restoration of expansive soil slopes.Three different cementitious habitat substrates were prepared by doping polypropylene fibers,basalt fibers and brown fibers,and the physical,mechanical and ecological indexes of each slope habitat substrate were determined regularly by slope model tests.The results showed that:①Compared with the control group(CK group),the incorporation of polypropylene fiber,basalt fiber and brown fiber could significantly improve the internal pore structure of the substrate,and the permeability coefficient decreased by 28.43%~39.39%,5.58%~10.13%and 31.36%~43.14%,respectively.The shear strength of the base material is improved by the incorporation of fiber.The cohesive force is increased by 28.37%~32.75%,12.23%~14.82%,32.52%~37.21%,and the internal friction angle is increased by 0.07%~1.62%,0.41%~1.21%,1.31%~2.07%,respectively.②The addition of fiber promoted plant growth by improving the pore structure of the substrate.From the average content of the whole period,the underground biomass of the three groups of fiber groups increased by 26.38%,8.93%and 51.06%respectively compared with the CK group.③After experiencing natural rainfall,the water content of slope soil de creases with the increase of depth,and increases with the increase of rainfall.The difference of water content before and after rainfall in the mixed fiber group is significantly lower than that in the CK group,and the effect is brown fiber>polypropylene fiber>basalt fiber.Through comprehensive analysis,it is concluded that the addition of fiber has a significant improvement effect on the slope protection performance of the cement-based habitat substrate of expansive soil slope.Comprehensive environmental protection and cost factors,brown fiber used in practical engineering is more in line with the concept of sustainable development.The research results can provide theoretical support and technical guidance for the ecological protection of expansive soil slope,and have reference significance for the ecological protection of other special soil slopes.
作者
刘振忠
党艳娜
王明
刘黎明
杨旭
陈健
LIU Zhenzhong;DANG Yanna;WANG Ming;LIU Liming;YANG Xu;CHEN Jian(Shenzhen Comprehensive Transportation and Municipal Engineering Design and Research Institute Co.,Ltd.,Shenzhen 518003,China;Hubei Provincial Engineering Research Center of Slope Habitat Construction Technique Using Cement-based Materials(China Three Gorges University),Yichang 443002,China;Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University),Ministry of Education,Yichang 443002,China)
出处
《金属矿山》
CAS
北大核心
2024年第10期224-232,共9页
Metal Mine
基金
国家青年科学基金项目(编号:42207544)
水泥基生态修复技术湖北省工程研究中心(三峡大学)开放基金课题(编号:2022SNJ04)
三峡库区地质灾害教育部重点实验室(三峡大学)开放研究基金项目(编号:2023KDZ12)。
关键词
膨胀土边坡
水泥基生境基材
外掺纤维
基材特性
expansive soil slope
cementitious habitat substrates
externally doped fibers
substrate properties
作者简介
刘振忠(1971-),男,高级工程师;通信作者:刘黎明(1983-),男,讲师,博士,硕士研究生导师。
