含碎石断层泥剪切蠕变本构模型研究

doi:10.3724/1000-6915.jrme.2025.0660

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Abstract Surface faults are commonly filled with fault gouge that contains crushed rock and clay, whose mechanical properties significantly influence fault stability. This type of fault gouge exhibits clay-like creep behavior under stress, while its mechanical strength is generally greater than that of pure clay due to the presence of rock fragments. To accurately describe the creep process of this fault gouge, in-situ samples from a hydropower station were selected as the research subject. The clay mineral composition was analyzed and determined through X-ray diffraction and scanning electron microscopy tests. Based on the Boltzmann linear superposition principle, creep shear tests were conducted on the fault gouge. The total strain was decomposed into three components: linear viscoelastic strain, linear viscoplastic strain, and nonlinear viscoplastic strain. Corresponding constitutive relationships were established for each component, leading to the development of a novel composite constitutive model based on a generalized viscoelastic body, an Abel dashpot, and a power-law empirical model. The model parameters were determined and validated using experimental data, and the accuracy of the model was compared with that of the traditional H-K model. The results indicate that: (1) the primary clay mineral component of the fault gouge in the study area is montmorillonite, and the creep process of the gravel-containing fault gouge exhibits typical nonlinear characteristics; (2) after establishing the composite model and determining all its parameters, comparative validation with the traditional H-K model demonstrates that the proposed model can more accurately capture the sharp increase in deformation rate during the accelerated creep stage, confirming its good applicability and superiority.

Key words： soil mechanics composition of minerals fault gouge creep mode constitutive model

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	Articles by authors
	WANG Zhaoyu1
	2
	ZHAO Weihua1
	2*
	JU Nengpan1
	2
	LIN Qinghua1
	2
	TAN Lin1
	2
	HU Xiaolong1
	2

Cite this article:

WANG Zhaoyu1,2,ZHAO Weihua1, et al. Constitutive model for shear creep behavior of fault gouge containing crushed rock#br#[J]. , 2026, 45(4): 1266-1276.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0660 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I4/1266

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