A method to obtain artificial sandstone joint specimens for the description of permeability anisotropy-based joint shear deformation,Geomechanics and Geophysics for Geo-Energy and Geo-Resources

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A method to obtain artificial sandstone joint specimens for the description of permeability anisotropy-based joint shear deformation
Geomechanics and Geophysics for Geo-Energy and Geo-Resources ( IF 3.9 ) Pub Date : 2021-04-29 , DOI: 10.1007/s40948-021-00245-6
Yu Song , Baoguo Liu , Hao Liu , Xiaomeng Shi , Darui Ren , Mingyuan Yu

Abstract

Shear-related joint deformation is critical in the study of the anisotropic characteristics of a single rough joint in the ground stress field, such as aperture development within rock mass joints under the disturbance of mining construction, hydraulic transmissivity and permeability of gas in fractures in georesource research. However, natural rock specimens are too heterogeneous for laboratory tests, and many scholars prefer using a uniform material to replicate natural rock specimens in their investigation. This paper proposed a method to replicate natural sandstone with artificial materials composed of cement, microsilica and quartz sand. Orthogonal tests were designed, and the basic physical and mechanical parameter trends at different mass ratio levels of water-binder, sand-binder and microsilica-cement in binder materials were analyzed by range analysis. Finally, multivariate polynomial regression was applied to describe the relationship among parameters such as σ_c, σ_t, E, and formula factors of the orthogonally designed specimens as regression equations. Based on the equations obtained from multivariate polynomial regression, a method to determine the formula for artificial sandstone was proposed. The artificial sandstone with the formula determined by this method was tested to be within the allowable error margin compared with the prototype, which proves that the proposed method is effective. Artificial specimens with a well-matched single rough joint were cast, and then direct shear tests were performed on the joint specimens to study the description of permeability anisotropy-based joint shear deformation.

Article Highlights

Cement, sand and microsilica that were used to make reactive powder concrete were introduced to replicate specific sandstone.
An orthogonal design-based method was proposed to investigate the effects of the formula factors of the material on its physical and mechanical parameters.
The physical and mechanical characteristics of the described material and sandstone were compared to certify the accuracy of the replication process.
A multivariate polynomial regression process was proposed to determine the exact formula of the artificial material in the replication of specific sandstone.
To further extend the application of the method in artificially making joint specimens, specimens were cast and direct shear tests were performed to study the description of permeability anisotropy-based joint shear deformation.

中文翻译：

描述基于渗透率各向异性的节理剪切变形的人工砂岩节标本的获取方法

摘要

剪切相关的节理变形对于研究地应力场中单个粗糙节理的各向异性特征至关重要，例如在矿山构造扰动下岩体节理内的孔隙发展，水力传输率和地质资源中裂缝中的瓦斯渗透率研究。但是，天然岩石标本对于实验室测试而言太异质了，许多学者更喜欢在研究中使用统一的材料来复制天然岩石标本。本文提出了一种用水泥，微硅石和石英砂组成的人工材料复制天然砂岩的方法。设计了正交试验，并研究了不同质量比水平的水粘合剂的基本物理和机械参数趋势，通过范围分析法分析了粘结剂材料中的砂粘结剂和微硅水泥。最后，使用多元多项式回归来描述参数之间的关系，例如σ _Ç，σ_吨，Ë正交设计的标本作为回归方程，和式的因素。基于多元多项式回归方程，提出了一种确定人造砂岩配方的方法。与原型相比，用该方法确定的配方的人造砂岩经测试在允许的误差范围内，证明了该方法是有效的。铸造具有良好匹配的单个粗糙接头的人造试样，然后对接头试样进行直接剪切试验，以研究基于渗透率各向异性的接头剪切变形的描述。