| 赵阳,周宏伟*,钟江城.人工砂岩物理力学性质的实验研究[J].实验力学,2018,33(3):385~394 |
| 人工砂岩物理力学性质的实验研究 |
| Experimental study of physical and mechanical properties of artificial sandstone |
| 投稿时间：2017-06-04 修订日期：2017-08-03 |
| DOI：10.7520/1001-4888-17-121 |
| 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(51674266)；国家重点研发计划(2016YFC0600704) |
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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。通过声波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，其中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 40MPa forming pressure, 37 artificial argillaceous sandstone samples with 25mm diameter and 50mm height were fabricated, by selecting epoxy resin as binder and adopting quartz sand and clay with different proportions as materials. Its mechanical properties were obtained through sound speed measurement experiment and uniaxial compression experiment. All measured results of dynamic and static elastic modulus of artificial sandstone decrease with the increase of clay mass fraction，among which, the measured results of dynamic modulus of elasticity are relatively higher. Its structure properties were obtained by CT scanning experiment. The distribution of quartz sand and clay is uniform in artificial sandstone. As skeleton structure of rock mass, there is plenty of pore space between quartz sand grain, while clay is distributed in intergranular pore in the form of filling. When the clay mass fraction is greater than 10%, partial clay could replace quartz sand as part of rock skeleton. The porosity and permeability were obtained by overpressure permeation experiment. An seepage model of artificial sandstone approximately satisfies Poiseuille equivalent pipe seepage model. In addition, the porosity and permeability of artificial sandstone are all negatively correlated with clay mass fraction, among which, the porosity and clay mass fraction accord with linear relation, permeability and clay mass fraction satisfy negative exponential relation. |
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