摘要
岩石相似材料配比中水敏材料的合理选择是开展水岩劣化作用下岩体工程大型物理模型实验研究的重要基础与前提。从研制适用于开展水岩作用相关物理模型试验相似材料的角度出发,以石英砂、重晶石粉为骨料,水泥、石膏为胶结材料,分别添加膨润土、伊利石粉、高岭土作为水敏性调节剂来制作岩石相似材料,开展了单轴压缩、直剪以及水理性试验,获得了不同配比相似材料的物理力学参数和水理性质指标,并采用单因素控制法深入分析了不同黏土矿物类型与不同掺入量对相似材料试样物理力学性质与水理性质的影响。结果表明:①添加黏土矿物的相似材料,其物理力学参数分布范围广,能满足岩石相似材料的需求;②黏土矿物的添加显著改变了试样的物理力学性质,随着其掺入量的增加,试样密度、抗压强度、弹性模量以及黏聚力整体呈下降趋势,内摩擦角呈增大趋势,其中膨润土的影响程度强于伊利石粉和高岭土;③含有膨润土的相似材料相对于其他黏土矿物吸水率更大,更易于发生崩解,更适合作为研究水岩相互作用的物理模型试验相似材料的水敏性添加剂。该研究成果可为研制适用于开展水岩相互作用的物理模型试验相似材料提供参考。
Reasonable selection of water-sensitive materials in rock similar material is an important foundation and premise for the experimental study of large-scale physical model of rock mass engineering under water-rock degradation interaction.To develop rock similar materials suitable for physical model tests of water-rock interaction,the quartz sand and the barite powder were used as aggregates,cement and gypsum were used as cementing materials and the bentonite,illite powder or kaolin were respectively added as water-sensitivity modifiers to make rock similar materials.The uniaxial compression,direct shear and hydraulic tests were carried out to obtain the physico-mechanical parameters and hydraulic properties of rock similar materials with different ratios.Moreover,the single-factor control method was used to deeply research the effects of different clay mineral types and different dosages on the physico-mechanical properties and hydraulic properties of rock similar material samples.The experiment results reveal these as follows.The rock similar materials with clay minerals have a wide distribution of physico-mechanical parameters,which can meet the needs of different rock-like materials.The adding of clay minerals significantly changes the physico-mechanical property of the sample.The compressive strength,elastic modulus and cohesion showed a decreasing trend as a whole,and the internal friction angle showed an increasing trend,and the influence of bentonite was stronger than that of illite powder and kaolin.The rock similar materials with bentonite have higher water absorption than other clay minerals and are more prone to disintegration,which more suitable as water-sensitive additives for similar materials in physical model tests for studying water-rock interaction.The research results can provide a reference for the development of similar materials for physical model tests of water-rock interaction.
作者
崔远
薛雷
许超
董金玉
杨继红
赵海溪
CUI Yuan;XUE Lei;XU Chao;DONG Jin-yu;YANG Ji-hong;ZHAO Hai-xi(Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;College of Geosciences and Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450046,China)
出处
《科学技术与工程》
北大核心
2022年第31期13896-13904,共9页
Science Technology and Engineering
基金
国家自然科学基金(42090052,41977249)
国家重点研发计划(2019YFC1509701)。
