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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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

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	Articles by authors
	PENG Menglong1
	2
	HE Manchao1
	3
	GUO Yongfa4
	CHENG Tai1
	2
	QIAO Yafei1
	2

Cite this article:

PENG Menglong1,2,HE Manchao1, et al. Mechanical behavior and energy evolution characteristic of sandstone under the combined effect of strain rate and confining pressure[J]. , 2025, 44(8): 2071-2085.

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

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