Mechanical properties of rock mass and slope stability under freeze-thaw cycles

doi:10.16265/j.cnki.issn1003-3033.2025.S2.0027

Abstract

Abstract:

In order to study the effect of freeze-thaw cycles on slope stability, the conventional physical and mechanical parameter test of rock mass was conducted by taking the slope of a Chinese mine stope as an example, with a focus on the evolution of physical and mechanical properties of three types of lithology and gravel soil under the freeze-thaw cycles. In consideration of the combined actions of self-weight, seismic force, and freeze-thaw cycles, the mechanism by which freeze-thaw cycles affect the slope stability was explored by comparing the stability of seven typical profiles. The results show that the freeze-thaw cycle significantly increases the water content of rock and accelerates the damage and deterioration of rock. The mechanism of deterioration can be described as follows: the presence of pre-existing defects causes the formation of ice crystals and the migration of frost swelling pressure to the defect zones, which then acts on the crack propagation and penetration of the defect surfaces. Quantitative analysis indicates that the overall stability of the slope is significantly reduced, and the stability of seven profiles decreases by 18%-27% after 30 freeze-thaw cycles.

Key words: freeze-thaw cycle, mechanical property, slope stability, influence mechanism, freeze-thaw damage

CLC Number:

X936

LU Sen, XU Shuai, WANG Shunqiang, CUN Senbuer, WANG Jianlong. Mechanical properties of rock mass and slope stability under freeze-thaw cycles[J]. China Safety Science Journal, 2025, 35(S2): 210-215.

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岩石名称	ρ/ (g·cm^-3)	σ_t/MPa	σ_c/MPa		E/GPa		μ		抗剪强度参数
岩石名称	ρ/ (g·cm^-3)	σ_t/MPa	自然	饱和	自然	饱和	自然	饱和	C/MPa	φ/(°)
灰岩	2.74	3.2	60.0	43.6	27.44	23.77	0.26	0.27	13.78	41.63
矽卡岩	2.86	4.6	70.0	53.8	30.00	25.00	0.26	0.27	14.53	44.40
凝灰岩	2.79	5.5	80.0	61.3	42.37	36.20	0.24	0.25	21.64	47.70

岩石种类	含水率/%	密度/ (g·cm^-3)	导热系数/(W·m^-1·K^-1)		比热容/(J·kg^-1·K^-1)
岩石种类	含水率/%	密度/ (g·cm^-3)	20 ℃	-25 ℃	20 ℃	-25 ℃
灰岩	0.04	2.74	3.16	3.19	624	602
矽卡岩	0.02	2.77	2.01	2.04	592	574
凝灰岩	0.13	2.84	3.63	3.65	594	577
碎石土	21.04	1.86	1.38	1.62	765	738

样品编号	干密度/ (g·cm^-3)	初始含水率/ %	冻结温度/ ℃
DW-1	1.55	5.02	-0.43
DW-2	1.53	9.88	-0.37
DW-3	1.54	15.16	-0.31
DW-4	1.52	20.24	-0.24
DW-5	1.56	25.59	-0.19

剖面编号	稳定性系数(自重+地震力/自重+地震力+冻融循环)
剖面编号	Bishop法	Spencer法	Janbu法	平均值	降幅/%
A1	1.983/1.466	2.019/1.459	1.684/1.247	1.895/1.391	26.62
A2	1.862/1.411	1.881/1.442	1.708/1.269	1.817/1.374	24.38
A3	1.813/1.343	1.744/1.308	1.666/1.225	1.741/1.292	25.79
A4	2.913/2.224	2.945/2.354	2.552/2.008	2.803/2.195	21.69
B1	2.266/1.797	2.273/1.861	1.853/1.581	2.131/1.746	18.04
B2	1.948/1.443	1.940/1.448	1.764/1.319	1.884/1.403	25.51
B3	2.351/1.767	2.350/1.771	2.112/1.597	2.271/1.712	24.63

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