摘要
黏土水泥浆作为应用广泛的矿山注浆材料,注浆加固初期抗渗滤能力差、结石体强度低且易发生脆性破坏,影响注浆加固效果。以氧化石墨烯(hGO)为改性剂,掺入普通黏土水泥浆,制备了新型黏土水泥浆。通过室内试验,在对比分析hGO掺入量对黏土水泥浆的黏度、稳定性、塑性强度及结石体力学性能等主要性能参数影响的基础上,结合扫描电镜(SEM),从微观形貌角度对hGO的作用机理进行分析,提出了hGO改性黏土水泥浆结石体的生长模型。研究结果表明:hGO改性黏土水泥浆液固结后,结石体内部形成了以hGO片层为核心的黏土—水泥团聚物空间骨架,黏土颗粒填充其中,形成浆液体系架构,这是hGO改性黏土水泥浆性能优于传统黏土水泥浆的主要原因;随着hGO掺量的增加,黏土水泥浆液的黏度最大提高163%,浆液流动性下降;hGO改性黏土水泥浆的稳定性和塑性强度明显增强,同一养护时间塑性强度最大提高7.11倍;浆液结石体的单轴抗压强度和抗剪强度均提高,最大增幅分别为23.94%和25.27%,对浆液耐久性的优化作用明显。
As a sort of widely used material in mining construction,the clay-cement slurry grouting has low seepage and filtration resistance at the initial reinforcement stage.The grouting reinforcement is affected because of its low strength and brittle damage.In order to prepared the new clay-cement slurry,graphene oxide(hGO)is selected to blend with the common claycement paste,which is prepared by Hummers method as a modifier.Based on the comparative analysis of the main performance parameters of hGO modified clay-cement slurry,including viscosity,stability,plastic strength and mechanical properties,under differences hGO incorporation by means of indoor tests and combined with the mechanism of hGO from microscopic morphological point of view employed scanning electron microscope experiment,the growth model of hGO modified clay-cement slurry nodules is proposed.The results show that:A spatial skeleton of clay-cement slurry body with hGO lamellae as the core and filled by clay particles is formed,which explains hGO modified clay-cement slurry performs better than traditional clay-cement slurry.With the increase of hGO admixture,the viscosity of clay-cement slurry increases by 163%at most.The stability and plastic strength of the modified clay-cement slurry are significantly enhanced,and the maximum of plastic strength is 7.11 times under the same maintenance time.The early impermeability and water plugging of the slurry are significantly improved.The uniaxial compressive strength and shear strength of the plasma stone body are increased by 23.94%and 25.27%,which has obvious effects on the optimization of slurry durability.
作者
刘书杰
孙金泽
丁振宇
张基伟
LIU Shujie;SUN Jinze;DING Zhenyu;ZHANG Jiwei(Well Construction Branch,China Coal Research Institute,Beijing 100013,China;Beijing China Coal Mine Engineering Company Ltd.,Beijing 100013,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《金属矿山》
CAS
北大核心
2023年第3期59-64,共6页
Metal Mine
基金
国家自然科学基金青年基金项目(编号:51804157)。
