深部高温水浸砂岩力学劣化与渗透率演化特征试验研究

doi:10.3724/1000-6915.jrme.2025.0580

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Abstract To address the significant weakening of deep surrounding rock under coupled hydro-thermal-mechanical (HTM) conditions, conventional triaxial compression-permeability tests were conducted on sandstone specimens immersed in water at varying temperatures using a triaxial multi-field coupling apparatus. The main findings are as follows: (1) The HTM coupling effect markedly weakens the pre-peak load-bearing capacity of rock; elevated temperature intensifies the initial damage and the dissolution of internal cement, resulting in damage stress , peak strength and residual strength decreasing significantly with increasing water temperature. (2) During the unstable crack-propagation stage, permeability (K) exhibits a quasi-exponential increase, with a faster growth rate at higher temperatures; post-peak, the dissipated energy Ud rises sharply and is expended on rock dilatancy and macroscopic cracking, driving K rapidly to its peak—an overall “∧” -shaped trend—where the strain corresponding to the intersection of elastic energy and can serve as a characteristic threshold for the surge of K to its maximum. (3) Approximately 55 ℃ is identified as a critical temperature threshold for the transformation of the mechanical response mechanism of sandstone; above this temperature, the mechanism shifts from water-rock physical softening to a composite damage mode dominated by mineral dissolution and thermally induced microcrack propagation, with the dilatancy angle? and K increasing significantly, and the peak permeability value of 85C–15 sample is about 1.54 times that of 25C–15 sample. (4) Dry and low-temperature water-soaked specimens are characterized by throughgoing, high-angle shear planes, exhibiting typical brittleness, while high-temperature water-soaked and high-initial-damage specimens display enhanced local plasticity and dilatancy, forming conical, non-throughgoing structures with earlier post-peak instability. These results reveal the weakening mechanism of sandstone under high-temperature water immersion and provide a foundation for evaluating the long-term stability of underground projects, such as deep, high-temperature mines and deeply buried, water-rich tunnels.

Key words： rock mechanics high temperature water immersion rock damage penetration characteristics energy evolution

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	LIU Shangxiao1
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	XIN Song1
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	JIANG Yujing2
	3
	WANG Wei1
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Cite this article:

LIU Shangxiao1,2,3, et al. Experimental assessment of mechanical degradation and permeability evolution in deep sandstone during high-temperature water immersion[J]. , 2026, 45(1): 175-191.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0580 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I1/175

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