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人工砂岩物理力学性质的实验研究
Experimental study of artificial sandstone physical and mechanical properties
投稿时间: 2017-06-04  最后修改时间: 2017-08-03
DOI:
中文关键词:  人工砂岩  配比实验  弹性模量  CT扫描  孔隙渗透
英文关键词:Artificial sandstone  experiment on material ratio  elastic modulus  CT scanning  porosity and permeability
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目);国家重点基础研究发展计划(973计划)
作者单位E-mail
赵阳 中国矿业大学(北京) zhao_no1@126.com 
钟江城 中国矿业大学(北京)  
周宏伟 中国矿业大学(北京) zhw@cumtb.edu.cn 
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中文摘要:
      在40MPa的成型压力下,选用环氧树脂作为粘结剂,采用不同配比的石英砂、粘土为材料制作了37个直径25mm高度50mm的泥质人工砂岩。通过声速测量实验与单轴压缩实验得到其力学性质:人工砂岩的动静弹性模量测量结果均随粘土质量分数的增加而降低,动态弹性模量的测量结果相对较高。通过CT扫描实验得到其结构性质:人工砂岩中石英砂与粘土分布均匀,石英砂颗粒作为岩体的骨架结构,粒间存在丰富的孔隙空间,粘土则以填充的形式分布在粒间孔隙中。当粘土质量分数大于10%时,部分粘土将代替石英砂成为岩样骨架的一部分。通过覆压渗透实验得到其孔隙及渗透性质:人工砂岩渗透性质近似满足Poiseuille等效管道渗流模型。孔隙度及渗透率均与粘土质量分数呈负相关,其中孔隙度与粘土质量分数符合线性关系,渗透率与粘土质量分数满足负指数关系。
英文摘要:
      Under the uniform pressure of 40MPa, 37 artificial argillaceous sandstone samples with the diameter of 25mm and the height of 50mm were prepared by using different ratios of quartz sand and clay as materials and using the epoxy resin as binder. According to the results of the sound velocity measurement experiment and uniaxial compression test, the static and dynamic elastic modulus of artificial sandstone decreases with the increase of clay content; The static elastic modulus is larger than dynamic elastic modulus. According to the results of CT scanning, the quartz sand particles constitute the skeleton structure of the rock mass, between which abundant pore spaces are present; in addition, the clay is distributed in the pore spaces in the form of filling. The distribution of quartz sand and clay in artificial sandstone is uniform. When clay content is more than 15%, some clay will replace quartz sand as part of the rock skeleton. In addition, the overburden pressure and permeability experiments show that, the artificial sandstone approximately satisfy Poiseuille equivalent pipeline seepage model; the porosity and permeability of artificial sandstone are negatively correlated with the clay content; specifically, the porosity is in linear relation with the clay content, and there are negative exponential function between the permeability and the clay content.
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