Effects of a High Temperature (500 °C) on the Fracture Processes in Calcite-Cemented Sandstone Along Bedding-Plane Orientations
Effects of a High Temperature (500 °C) on the Fracture Processes in Calcite-Cemented Sandstone Along Bedding-Plane Orientations
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DOI：
10.1007/s00603-019-01916-3
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发表时间：
2019-08
影响因子：
6.2
通讯作者：
V. Maruvanchery;Eunhye Kim
中科院分区：
文献类型：
--
作者：
V. Maruvanchery;Eunhye Kim
岩石断裂力学在科学（例如地质学、地球物理学和材料科学）和工程（例如采矿、土木和机械工程）领域受到了广泛关注，因为了解岩石断裂力学可以极大地促进地质结构和基础设施的先进设计和安全。岩石断裂行为会受到高温的影响，甚至低于岩石熔点，因为由于晶格中矿物的不同热膨胀，高温会诱发微裂纹（Kranz 1983）。即使岩石冷却至室温后，岩石中的热致微裂纹也是不可逆转的（Dwivedi 等人，2008 年；Tian 等人，2012 年）。热致裂纹密度取决于最高温度、温度升高速率、热膨胀失配、热膨胀各向异性、岩石孔隙率和晶粒尺寸。此外，应变粘结的断裂以及静态、准静态和动态载荷产生的压应力、拉应力或剪应力也会形成微裂纹。与热诱发的微裂纹不同，这些微裂纹在岩体内分布不均匀，或者集中在局部不连续性附近，例如断层（Anders et al. 2014）。
Rock fracture mechanics has received substantial attention in both scientific (eg, geology, geophysics and material science) and engineering (eg, mining, civil and mechanical engineering) fields since understanding rock fracture mechanics can contribute greatly to the advanced design and safety of geostructures and infrastructures. Rock fracture behavior is affected by high temperatures, even below the rock melting point, because high temperatures can induce microscale cracks due to the differential thermal expansion of minerals in the crystal lattice (Kranz 1983). Thermalinduced microcracks in rocks are irreversible even after the rocks are cooled down to room temperature (Dwivedi et al. 2008; Tian et al. 2012). Thermally induced crack density depends on the maximum temperature, rate the temperature increases, thermal expansion mismatch, thermal expansion anisotropy, rock porosity, and grain size. In addition, microcracks can be formed by the breakage of strained bonds and compressive, tensile or shear stresses generated by static, quasi-static, and dynamic loads. Unlike thermally induced microcracks, these latter microcracks can have a nonuniform distribution within a rock mass or can be concentrated near a local discontinuity, such as a fault (Anders et al. 2014).