钢渣基胶凝剂改性注浆体的力学特性与细观损伤机理研究  

Study on the Mechanical Properties and Meso-Damage Mechanism of Grouting Body Modified by Steel Slag-Based Cementitious Agent

作　　者：周春煦 冯红春 周文正 ZHOU Chunxu;FENG Hongchun;ZHOU Wenzheng(Jiangsu Shipping College,Nantong,Jiangsu 226010,China;School of Civil Engineering,Central South University,Changsha,Hunan 410083,China;School of Civil Engineering,Southeast University,Nanjing,Jiangsu 211189,China)

机构地区：[1]江苏航运职业技术学院,江苏南通市226010 [2]中南大学土木工程学院,湖南长沙410083 [3]东南大学土木工程学院,江苏南京211189

出　　处：《矿业研究与开发》2023年第8期173-179,共7页Mining Research and Development

基　　金：国家自然科学基金项目(52078133);江苏省高职院校教师专业带头人高端研修(个人访学研修)项目(2021GRGDYX007);南通市科技计划项目(MSZ21096,JCZ21005)。

摘　　要：为研究不同钢渣基胶凝剂掺量条件下注浆体的破坏特征及细观机理,对试件开展单轴压缩试验,并通过PFC2D软件进行注浆体的二维离散元模拟,分析了破坏后注浆体力学行为的细观机理。结果表明:随着钢渣基胶凝剂掺量的增加,注浆体试件的无侧限抗压强度与弹性模量呈现指数型上升规律,破坏应变呈抛物线函数的变化趋势;由离散元模拟得到的注浆体力学参数及应力-应变关系与实测结果较为吻合;随着钢渣基胶凝剂掺量的增加,注浆体的破坏形式逐渐由压碎型破坏向剪切型破坏模式过渡;由离散元模拟得到的颗粒位移矢量场准确地反映了注浆体在单轴压缩荷载作用下的细观损伤特征与破坏模式。In order to study the failure characteristics and meso-mechanism of grouting body under different contents of steel slag-based cementitious agent,uniaxial compression tests were carried out on the specimens,and two-dimensional discrete element simulation of the grouting body was conducted by PFC2Dsoftware to analyze the meso-mechanism of the mechanical behavior of the grouting body after failure.The results show that with the increase of the content of steel slag-based cementitious agent,the unconfined compressive strength and elastic modulus of grouting specimens show an exponential increase law,and the failure strain shows a parabolic function change trend.The mechanical parameters and stress-strain relationship of grouting body were obtained by discrete element simulation,and the simulation results were in good agreement with the measured results.With the increase of the content of steel slag-based cementitious agent,the failure mode of grouting body gradually transits from crushing failure to shear failure mode.The displacement vector field of particles was obtained by discrete element simulation,which can accurately reflect the meso-damage characteristics and failure mode of grouting body under uniaxial compression load.

关 键 词：注浆体 钢渣基胶凝剂 力学特性 细观损伤机理 离散元 

分 类 号：TD350.4[矿业工程—矿井建设] TD353.8