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Open Access

Experimental Study on Creep Characteristics and Damage Model of Carbonaceous Slate After Freeze-Thaw

Guomin Liu^{¹^,²}, Mei Huang^{¹^,²}(), Mingming Cao^³, Hua Chen^³

Sichuan Long Highway Tunnel (Group) Operation Safety Engineering Laboratory, Chengdu, Sichuan 611130, China

Sichuan Vocational and Technical College of Communications, Chengdu, Sichuan 611130, China

Sichuan Communication Surveying & Design Institute Co., Ltd., Chengdu, Sichuan 610017, China

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Abstract

Taking the carbonaceous slate of Zhuokeji tunnel on the Wenchuan-Ma, erkang expressway as the research subject, triaxial compression creep tests were conducted under various freeze-thaw cycles to analyze the creep strain characteristics and long-term strength of the carbonaceous slate. Assuming that the aging damage of rock under load follows the Weibull probability density distribution, the loaded damage variable is defined. The freeze-thaw damage variable is defined according to the phenomenological theory of damage mechanics. Considering the coupling effect of freeze-thaw and stress, a total damage variable for freeze-thaw and load is constructed. Based on the creep behavior of carbonaceous slate, the structure of the H-H|N-N|S creep model is determined. Based on this, the damage evolution is carried out, and a new creep damage model that can reflect the coupling of freeze-thaw and stress is obtained, which is extended to a three-dimensional stress state. The solution method for model parameters is provided, and the damage evolution law is analyzed. The creep characteristics of carbonaceous slate are identified using the established model. A traditional model is introduced for comparison, and the simulation comparison curve is analyzed to verify the feasibility and rationality of the new model.

Keywords

tunnel engineering carbonaceous slate creep freezing-thaw loading damage model

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Journal of Highway and Transportation Research and Development (English Edition)

Volume 18 Issue 2,
June 2024

Pages 46-55

DOI: 10.26599/HTRD.2024.9480013

Cite this article:

Liu G, Huang M, Cao M, et al. Experimental Study on Creep Characteristics and Damage Model of Carbonaceous Slate After Freeze-Thaw. Journal of Highway and Transportation Research and Development (English Edition), 2024, 18(2): 46-55. https://doi.org/10.26599/HTRD.2024.9480013

Natural gravity (kN/m³)	Void ratio (%)	Natural water content (%)	Natural density (g/cm³)	Dry density (g/cm³)
23.47	0.58	1.78	2.54	2.52

Freeze-thaw cycles (time)	Deviatoric stress (MPa)	G₁(GPa)	G₂(GPa)	K(GPa)	η₂ (GPa·h)	η₃ (GPa·h)	α	β	m	(σ₁-σ₃)_s (MPa)	R²
0	16.62	1.936	6.754	4.196	59.223	—	—	110.26	1.52	76.02	0.983 9
	33.24	7.764	30.787	16.822	199.081	—					0.984 6
	49.86	13.837	54.869	29.981	295.659	—					0.985 5
	66.48	20.358	65.863	44.108	381.295	—					0.992 5
	83.10	22.508	89.253	48.768	277.936	185.734					0.989 6
	99.72	34.867	138.261	75.545	335.770	12.375					0.991 2
5	16.62	1.568	6.219	3.398	42.320	—	0.07	84.59	1.26	58.84	0.984 4
	33.24	10.479	41.554	22.705	230.982	—					0.992 3
	49.86	13.945	55.296	30.214	247.758	—					0.989 9
	66.48	18.932	71.071	41.019	286.438	136.031					0.984 2
	83.10	22.482	89.149	48.711	196.716	7.358					0.989 7
15	16.62	1.390	5.510	3.011	32.494	—	0.16	57.53	0.85	55.63	0.979 6
	33.24	6.160	22.427	13.347	113.603	—					0.991 4
	49.86	9.473	37.566	20.526	134.210	—					0.984 5
	66.48	13.959	55.351	30.244	160.942	83.439					0.990 5
	83.10	15.116	59.939	32.751	72.545	4.216					0.988 4
30	16.62	1.102	4.370	2.388	21.969	—	0.37	31.04	0.41	51.49	0.984 6
	33.24	7.256	28.773	15.721	108.782	—					0.989 7
	49.86	8.284	32.849	17.948	88.778	—					0.985 9
	66.48	13.509	53.568	29.269	109.152	51.368					0.990 8
	83.10	18.561	73.673	40.215	27.841	2.504					0.991 5