Kolano Malwina, Cała Marek, Stopkowicz Agnieszka
Faculty of Civil Engineering and Resource Management, AGH University of Krakow, 30-059 Krakow, Poland.
Materials (Basel). 2024 Jul 18;17(14):3564. doi: 10.3390/ma17143564.
Rock salt is a potential medium for underground storage of energy resources and radioactive substances due to its physical and mechanical properties, distinguishing it from other rock media. Designing storage facilities that ensure stability, tightness, and safety requires understanding the geomechanical properties of rock salt. Despite numerous research efforts on the behaviour of rock salt mass, many cases still show unfavourable phenomena occurring within it. Therefore, the formulation of strength criteria in a three-dimensional stress state and the prediction of deformation processes significantly impact the functionality of storage in salt caverns. This article presents rock salt's mechanical properties from the Kłodawa salt dome and a statistical analysis of the determined geomechanical data. The analysis is divided into individual mining fields (Fields 1-6). The analysis of numerical parameter values obtained in uniaxial compression tests for rock salt from mining Fields 1-6 indicates an average variation in their strength and deformation properties. Upon comparing the results of Young's modulus (E) with uniaxial compressive strength (UCS), its value was observed with a decrease in uniaxial compressive strength (E = 4.19968·UCS, R-square = -0.61). The tensile strength of rock salt from mining Fields 1-6 also exhibits moderate variability. An increasing trend in tensile strength was observed with increased bulk density (σ = 0.0027697·ρ - 4.5892, r = 0.60). However, the results of triaxial tests indicated that within the entire range of normal stresses, the process of increasing maximum shear stresses occurs linearly ((σ - σ)/2 = ((σ + σ)/2)·0.610676 + 2.28335, r = 0.92). A linear relationship was also obtained for failure stresses as a function of radial stresses (σ = σ·2.51861 + 32.9488, r = 0.73). Based on the results, the most homogeneous rock salt was from Field 2 and Field 6, while the most variable rock salt was from Field 3.
由于岩盐的物理和力学性质，使其有别于其他岩石介质，它是一种储存能源资源和放射性物质的潜在地下介质。设计确保稳定性、密封性和安全性的储存设施需要了解岩盐的地质力学性质。尽管对岩盐体的行为进行了大量研究，但许多情况下仍会出现不利现象。因此，三维应力状态下强度准则的制定以及变形过程的预测对盐穴储存功能有重大影响。本文介绍了来自克沃达瓦盐丘的岩盐力学性质以及对所测定地质力学数据的统计分析。分析分为各个采区（1 - 6区）。对采区1 - 6的岩盐在单轴压缩试验中获得的数值参数值进行分析表明，其强度和变形特性存在平均差异。将杨氏模量（E）与单轴抗压强度（UCS）的结果进行比较时，观察到随着单轴抗压强度降低，杨氏模量的值也降低（E = 4.19968·UCS，决定系数R² = -0.61）。采区1 - 6的岩盐抗拉强度也表现出适度的变异性。随着堆积密度增加，观察到抗拉强度呈上升趋势（σ = 0.0027697·ρ - 4.5892，相关系数r = 0.60）。然而，三轴试验结果表明，在整个法向应力范围内，最大剪应力的增加过程呈线性（(σ₁ - σ₃)/2 = ((σ₁ + σ₃)/2)·0.610676 + 2.28335，r = 0.92）。对于破坏应力与径向应力的函数关系也得到了线性关系（σ₁ = σ₃·2.51861 + 32.9488，r = 0.73）。基于这些结果，最均匀的岩盐来自2区和6区，则变化最大的岩盐来自3区。
