It is critical to understand the temperature-dependent shear behavior of rock in exploiting deep natural resources-geothermal energy, coal, and oil. The shear behavior of thermally damaged rock needs to be further clarified from a micromechanical perspective. In this study, a series of direct shear tests are performed on thermally damaged sandstone using the bonded-particle model (BPM) with thermal formulation to investigate the temperature-dependent behavior. The macro mechanical properties and micro (AE) responses based on a moment tensor algorithm are derived from numerical models to provide insight into the temperature dependence of the mechanical behavior of sandstone. The simulated results indicate that high temperature can induce microcracks, a form of thermally induced damage. Thermally induced damage is a principal cause of the degradation of rock's mechanical properties. Generally, the maximum magnitudes of tensile, shear, and implosive events that can be tolerated without damage decrease gradually as the temperature increases. Also, AE -value are closely associated with temperature. The findings of this study provide new insights into the shear responses and failure behaviors of rocks at different temperatures, and further aid deep natural resource exploitation when thermal and mechanical properties are coupled. The findings of this study provide new insights into the shear responses and failure behaviors of rocks at different temperatures. These insights could be valuable for optimizing deep natural resource exploitation, particularly when considering the coupling of thermal and mechanical properties.

中文翻译：

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基于矩张量的粘结颗粒模型研究热损伤岩石的剪切行为

在开发深层自然资源（地热能、煤炭和石油）时，了解岩石随温度变化的剪切行为至关重要。热损伤岩石的剪切行为需要从微观力学角度进一步阐明。在本研究中，使用具有热公式的粘合颗粒模型 (BPM) 对热损伤砂岩进行了一系列直接剪切测试，以研究温度依赖性行为。基于矩张量算法的宏观力学特性和微观 (AE) 响应是从数值模型导出的，以深入了解砂岩力学行为的温度依赖性。模拟结果表明，高温会引起微裂纹，这是一种热致损伤的形式。热致损伤是岩石力学性能下降的主要原因。一般来说，在不损坏的情况下可以承受的拉伸、剪切和爆炸事件的最大幅度随着温度的升高而逐渐减小。此外，AE值与温度密切相关。这项研究的结果为不同温度下岩石的剪切响应和破坏行为提供了新的见解，并在热性能和机械性能耦合时进一步有助于深层自然资源的开发。这项研究的结果为不同温度下岩石的剪切响应和破坏行为提供了新的见解。这些见解对于优化深层自然资源开发非常有价值，特别是在考虑热性能和机械性能的耦合时。