应变速率和围压组合影响下砂岩的力学行为及能量演化特征

doi:10.3724/1000-6915.jrme.2024.0991

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摘要为研究应变速率和围压对砂岩非线性力学行为和能量演化特征的影响，开展一系列不同应变速率（10－5， 10－4，10－3，10－2 s－1）和不同围压（0，20，40，60 MPa）下的恒定应变速率和变应变速率试验，分析应变速率和围压对应力–应变曲线、特征强度、破坏模式、能量演化、脆性指标的影响规律。结果表明：特征强度随围压非线性增加，随应变速率的对数线性增加，且两者的影响相互独立；修正的Hoek-Brown准则能同时描述应变速率和围压对特征强度的非线性影响规律；应变速率的增加会导致岩石损伤破裂加剧、脆性增强，而围压的影响相反；岩石的吸能和储能能力随着围压和应变速率的增加呈增加趋势，围压的增加导致峰前耗散能密度占比增加进而导致峰前应力–应变曲线非线性增强，应变速率的增加导致全过程耗散能密度占比增加；基于耗散能演化曲线的能量脆性指标能更好地捕捉不同围压下应变速率对脆延性特征的影响。研究成果可为深部高应力高能量环境下的隧道稳定性分析、支护结构优化设计提供参考。

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	彭梦龙1
	2
	何满潮1
	3
	郭永发4
	程泰1
	2
	乔亚飞1
	2

关键词 ：岩石力学, 砂岩, 恒定应变速率, 变应变速率, 特征强度, 能量演化

Abstract： To investigate the combined effects of strain rate and confining pressure on the nonlinear mechanical behavior and energy evolution characteristics of sandstone, a series of constant and variable strain rate tests were conducted across various strain rates (10－5, 10－4, 10－3, 10－2 s－1) and confining pressures (0, 20, 40, 60 MPa). The influence of strain rate and confining pressure on the stress-strain curve, characteristic strength, failure mode, energy evolution, and brittleness index was analyzed. The results indicate that the characteristic strength increases nonlinearly with confining pressure and linearly with the logarithm of strain rate, demonstrating that these effects are independent of one another. The modified Hoek-Brown strength criterion effectively captures the nonlinear evolution of characteristic strength under varying strain rates and confining pressures. An increase in strain rate intensifies rock damage and fracturing, thereby enhancing brittleness, while confining pressure has the opposite effect. Both the energy absorption and storage capacity of the rock increase with confining pressure and strain rate. Higher confining pressure results in a greater proportion of pre-peak dissipated energy density, which intensifies the nonlinearity of the pre-peak stress-strain curve. Conversely, an increase in strain rate raises the proportion of total dissipated energy density throughout the deformation process. The energy-based brittleness index derived from the dissipated energy evolution curve more accurately reflects the influence of strain rate on brittle-ductile characteristics under different confining pressures. These findings provide robust support for tunnel stability analysis and the optimized design of support structures in deep, high-stress, and high-energy geological environments.

Key words： rock mechanics sandstone constant strain rate changing strain rate characteristic strength energy evolution

引用本文:

彭梦龙1，2，何满潮1，3，郭永发4，程泰1，2，乔亚飞1，2. 应变速率和围压组合影响下砂岩的力学行为及能量演化特征[J]. 岩石力学与工程学报, 2025, 44(8): 2071-2085.
PENG Menglong1, 2, HE Manchao1, 3, GUO Yongfa4, CHENG Tai1, 2, QIAO Yafei1, 2. Mechanical behavior and energy evolution characteristic of sandstone under the combined effect of strain rate and confining pressure. , 2025, 44(8): 2071-2085.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2024.0991 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I8/2071

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