Thermal storage of sandstone is widely distributed in sedimentary basins in China with a very high degree of exploitation and utilization, while the low recharge rate is the bottleneck of its sustainable development. A new method is proposed to discover the physical and mechanical behaviors of sandstone after thermal cycling and hydro‐thermal cycling treatments in this study. The stress‐strain curves, strength, failure behavior, acoustic emission (AE), P‐wave velocity, density features, X‐ray, and microscope images of specimens are analyzed in detail to investigate and describe the differences of the sandstone after the two different experimental treatments. The results indicate that multiple thermal cycling and hydro‐thermal cycling have an obvious effect on the compaction stage of sandstone at the temperature of 100°C. Meanwhile, strengths and Young's modulus of specimens after hydro‐thermal cycling treatment decrease with cycling times and the reduce degree is greater than that of the thermal cycling treatment on sandstone. The brittleness of the sandstone decreases as the hydro‐thermal cycling number increases from 0 to 15, and the influence of hydro‐thermal cycling is greater than that of thermal cycling on sandstone. In addition, based on the limited cycling experimental results, the action of the thermal cycling leaded the thermal stress of the crystal to nonuniform, which leaded to micronarrow and sharp cracks in specimens. Furthermore, the action of the hydro‐thermal cycling generated thermal stress and ablation coupling effect, which leaded wider and rounder cracks than that of the specimen under thermal cycling condition. Finally, it indicates that hydro‐thermal cycling has a greater effect than that of the thermal cycling treatment on the physical and mechanical properties of sandstone on the macro‐ and microlevels.

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热循环和水热循环对砂岩物理力学性能的影响

砂岩储热在我国沉积盆地中分布广泛，开发利用程度很高，补给率低是其可持续发展的瓶颈。在这项研究中，提出了一种新的方法来发现砂岩在热循环和水热循环处理后的物理和力学行为。详细分析了试样的应力-应变曲线，强度，破坏行为，声发射（AE），P波速度，密度特征，X射线和显微镜图像，以研究和描述两次后的砂岩差异。不同的实验方法。结果表明，多次热循环和水热循环对100℃温度下砂岩的压实阶段有明显的影响。同时，水热循环处理后的试样强度和杨氏模量随循环次数的增加而减小，其减小程度大于砂岩热循环处理的减小程度。随着水热循环次数从0增加到15，砂岩的脆性降低，并且水热循环的影响大于热循环对砂岩的影响。此外，基于有限的循环实验结果，热循环的作用导致晶体的热应力不均匀，从而导致样品中的细小裂纹和尖锐的裂纹。此外，水热循环的作用产生了热应力和烧蚀耦合效应，从而导致比热循环条件下的试样更宽，更圆的裂纹。最后，