岩溶洼地建库背景下水-气耦合试验相似材料研制  

Development of similar materials for water-air coupling test for reservoirbuilding in karst depressions

作　　者：邰胜平 陈世万 郑克勋 沈春勇 TAI Shengping;CHEN Shiwan;ZHENG Kexun;SHEN Chunyong(College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China;Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang 550025,China;Power China Guiyang Engineering Corporation Limited,Guiyang 550081,China)

机构地区：[1]贵州大学资源与环境工程学院,贵州贵阳550025 [2]贵州大学喀斯特地质资源与环境教育部重点试验室,贵州贵阳550025 [3]中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550081

出　　处：《人民长江》2024年第1期168-174,共7页Yangtze River

基　　金：国家自然科学基金项目“基于稀疏微震台站岩体崩塌主控裂纹扩展机制转化及失稳前兆信息研究”(42162027);贵州省科学技术基金项目“贵州省典型岩质崩塌微震监测预警模型及技术体系研究”(黔科合支撑[2022]一般212)。

摘　　要：在岩溶洼地建库研究中,为研制出满足水-气耦合模拟试验所需的相似材料,以砂子、普通水泥、石膏为原料,设计了4组不同粒径级配的试验组。通过岩石低渗测试技术和核磁共振分析技术,分析了4组不同颗粒级配相似材料的渗透率、孔隙分布及逾渗特征。研究结果表明:在分形维数Df=1.68~2.31范围内,相似材料的渗透率随颗粒级配分形维数增加而线性增大。4组试样中,分形维数越大,则材料内孔隙总量越多,孔径分布越集中,对应的主控孔隙尺寸降低。随着分形维数的增大,灰度阈值升高,逾渗阈值降低,材料越容易发生逾渗。基于实测渗透率,建立了相似材料的渗透率计算模型,计算值与实测值吻合度较高。研究成果成功运用于岩溶洼地模型试验并取得显著效果,为进一步研究水-气作用提供了合适的试验材料。To develop similar materials needed by the water-air coupling simulation test in research on reservoir construction in karst depressions,four groups materials with different particle size gradations were designed with sand,ordinary cement and gypsum as raw materials.The permeability,pore distribution and percolation characteristics of four groups of similar materials with different particle gradations were analyzed by rock low permeability test technology and nuclear magnetic resonance analysis technology.The results show that the permeability of similar materials increases linearly with the increase of particle gradation fractal dimension in the range of fractal dimension D f=1.68~2.31.In the four groups of samples,with the increase of fractal dimension,the total amount of pores in the material increases,the pore size distribution is more concentrated,and the corresponding main control pore size decreases.As the fractal dimension increases,the gray threshold increases,the percolation threshold decreases,and the percolation is more prone to happen.Based on the measured permeability,the permeability calculation model of the similar material is established,and the calculated value is in good agreement with the measured value.The research results have been successfully applied to the model test of karst depression and achieved remarkable results,which provides a material basis for further study of water-air interaction.

关 键 词：岩溶洼地 水-气耦合 相似模拟试验 渗透率 分形维数 核磁共振 

分 类 号：P642[天文地球—工程地质学] TV41[天文地球—地质矿产勘探]