玄武岩纤维加筋尾砂抗震液化试验研究  

Experimental Study on Seismic Liquefaction of Basalt Fiber Reinforced Tailings

作　　者：董致成 王光进[1,2] 李耀基 蔡彬亭[3] 王孟来[3] 李树建[3] DONG Zhicheng;WANG Guangjin;LI Yaoji;CAI Binting;WANG Menglai;LI Shujian(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650031,China;Yunnan International Technology Transfer Center for Mineral Resources Development and Solid Waste Resource Utilization,Kunming 650093,China;Yunnan Phosphate Chemical Group Co.,Ltd.,Kunming 650600,China)

机构地区：[1]昆明理工大学国土资源工程学院,昆明650031 [2]云南省矿产资源开发与固废资源利用国际技术转移中心,昆明650093 [3]云南磷化集团有限公司,昆明650600

出　　处：《硅酸盐通报》2023年第7期2513-2520,共8页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(52174114);云南省矿产资源开发与固废资源化利用国际技术转移中心项目(202203AE140012)。

摘　　要：基于地震荷载作用下尾砂发生液化现象,本文提出一种增强尾砂抗震液化特性的方法,即玄武岩纤维加筋尾砂。为验证纤维加筋尾砂的抗液化特性效果及其机理,运用动三轴仪对纤维加筋尾粉砂展开一系列动力试验,研究了同质量分数(0.3%)下不同长度(3、6、9、12、15、18 mm)以及相同长度(9 mm)下不同质量分数(0.1%、0.3%、0.5%、0.7%、0.9%)的纤维对尾砂抗液化性能影响。结果表明,纤维加筋尾砂能够有效提升尾砂的抗液化特性。就增强尾砂的抗液化效果而言,纤维存在最优长度和最优掺量分别为9 mm、0.3%。通过SEM发现,玄武岩纤维填充在尾砂颗粒的孔隙与裂隙中,并与尾砂颗粒发生缠绕、包裹等现象,甚至一些被包裹的纤维之间相互弯曲交织,构建成三维网状的“桥梁”纽带。Based on the liquefaction phenomenon of tailings under seismic load,this paper proposes a method to enhance the seismic liquefaction characteristics of tailings,namely basalt fiber reinforced tailings.In order to verify the anti-liquefaction effect and mechanism of fiber reinforced tailings,a series of dynamic tests were carried out on fiber reinforced tailings silt by using dynamic triaxial apparatus.The effects of fibers with different length(3,6,9,12,15,18 mm)under the same mass fraction(0.3%)and different mass fraction(0.1%,0.3%,0.5%,0.7%,0.9%)under the same length(9 mm)on the anti-liquefaction performance of tailings were studied.The results show that fiber reinforced tailings can effectively improve the liquefaction resistance of tailings.In terms of enhancing the anti-liquefaction effect of tailings,the optimal fiber length and optimal content are 9 mm and 0.3%,respectively.Through SEM images,it is found that basalt fibers are filled in the pores and fissures of tailings particles,and they are entangled and wrapped with tailings particles.Even some of the wrapped fibers are bent and interwoven with each other to build a three-dimensional mesh“bridge”bond.

关 键 词：玄武岩纤维 纤维加筋尾砂 动三轴试验 抗液化机理 地震荷载 

分 类 号：TU44[建筑科学—岩土工程]