Mechanical characterisation of new Sand-Hemihydrate rock-analogue material: Implications for modelling of brittle crust processes
Mechanical characterisation of new Sand-Hemihydrate rock-analogue material: Implications for modelling of brittle crust processes
复制标题
新型砂半水合物岩石模拟材料的机械表征：对脆性地壳过程建模的影响
DOI：
10.1016/j.tecto.2023.229828
复制
发表时间：
2023
期刊：
影响因子：
2.9
通讯作者：
Yamada Y.
中科院分区：
文献类型：
--
作者：
Massaro L.;Adam J.;Yamada Y.
模拟材料在动态尺度实验中起着关键作用，它定义了可以模拟的过程和模型中可观察到的结构。动态缩放使模型与其自然对应模型之间能够进行直接比较。为了获得这样的模型，必须将模拟材料的物理和机械性能与岩石原型进行比对。在模拟模拟研究中使用了多种材料，以满足(1)上地壳、(2)中地壳和(3)下地壳和地幔过程模拟的物理和力学要求。然而，新模型材料的发展代表着模拟模拟技术的不断改进。我们研究了一种新的颗粒状岩石模拟材料(GRAM)的力学和物理性质(由Massaro等人介绍)。(2022))及其组成材料。GRAM是一种由石英砂和石膏胶结而成的超弱人造砂岩，能够在变应力条件下通过拉伸和剪切破坏而变形。通过环剪试验和单轴压缩试验，系统地测试了不同混合比(半水粉质量分数为1%~4%)下的G集料。考察了半水含量与力学性能之间的关系。此外，还研究了GRAN的样品制备工艺，评价了残留水分含量对GRAK集料力学性能的影响，并确定了标准的制备程序。最后，从物理力学性质、物理模型的应用和动态缩尺等方面，将GRAM与天然岩石和用于模拟模拟研究的其他颗粒材料进行了比较。强调了在动态尺度实验中应用克集料如何能够加强对在损伤区规模上发生的断层和破裂过程的理解。
The analogue materials play a critical role in dynamically scaled experiments, defining the processes that can be simulated and the structures observable in the model. The dynamic scaling enables the direct comparison between the model and its natural counterpart. To obtain such a model the physical and mechanical properties of the analogue material must be scaled with respect to the rock prototype. A large variety of materials have been applied in analogue modelling studies to address the physical and mechanical requirements for the simulation of (i) upper crust, (ii) middle crust and (iii) lower crust and mantle processes. Nevertheless, the development of new model materials represents a continuous improvement of the analogue modelling techniques.We investigated the mechanical and physical properties of a new Granular Rock-Analogue Material (GRAM) (introduced in Massaro et al. (2022)) and its component materials. GRAM is an ultra-weak artificial sandstone composed of quartz sand cemented with gypsum, capable to deform by tensile and shear failure under variable stress conditions. GRAM aggregates in different mixing ratios (from 1% to 4% in weight of hemihydrate powder) were systematically tested with ring-shear tests and uniaxial compression tests. The relationships between the hemihydrate content and the mechanical properties of GRAM were examined. Additionally, the sample preparation procedure of GRAM was investigated, evaluating the impact of the residual water content on the mechanical properties of GRAM aggregates and defining a standard preparation procedure. Finally, GRAM was compared to natural rocks and to other granular materials applied in analogue modelling studies, in terms of physical and mechanical properties, application to physical modelling and dynamic scaling. It was underlined how the application of GRAM aggregates in dynamically scaled experiments can enhance the comprehension of the fault and fracture processes occurring at the scale of the damage zone.