Preprints
https://doi.org/10.5194/tc-2022-155
https://doi.org/10.5194/tc-2022-155
 
10 Oct 2022
10 Oct 2022
Status: this preprint is currently under review for the journal TC.

The temperature-dependent shear strength of ice-filled joints in rock mass considering the effect of joint roughness, opening and shear rates

Shibing Huang1,2, Haowei Cai1, Zekun Xin1, and Gang Liu1 Shibing Huang et al.
  • 1School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China
  • 2Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China

Abstract. Global warming causes many rockfall activities of the alpine mountains, especially when ice-filled joints in the rock mass become thawed. The warming and thawing of frozen soils and intact rocks was widely studied in the past several decades, however, the variation of shear strengths of ice-filled joints was not fully understood. Recently, some scholars studied the thawing process and strength loss of ice-filled joints at different temperatures, however, the influence of the joint roughness, opening and shear rate on ice-filled joints was not systematically investigated. In this study, a series of compression-shear experiments were conducted to investigate the shear strength of ice-filled rock joints by considering the effects of joint roughness, opening and shear rates. The shear strength quickly reduces with increasing temperature, especially above -1 ℃. In addition, the shear strength decreases with increasing joint openings but it increases with increasing joint roughness. When the joint opening is large enough, the effect of joint roughness disappears and the shear strength of ice-filled joints is equal to that of solid ice. Increasing shear rate will decrease the shear strength of ice-filled joints because the joint ice displays the brittle failure phenomenon at a high shear rate. The Mohr-coulomb criterion also can be used to characterize the relationship between the shear strength and the normal stress of ice-filled joints. However, a general strength model by considering the joint opening, normal stress and joint roughness should be proposed by a further study. This research can provide a better understanding of the warming degradation mechanism of ice-filled joints by considering the above important influencing factors.

Shibing Huang et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2022-155', Anonymous Referee #1, 26 Oct 2022
    • AC1: 'Reply on RC1', Shibing Huang, 20 Nov 2022
    • AC3: 'Reply on RC1', Shibing Huang, 20 Nov 2022
  • RC2: 'Comment on tc-2022-155', Anonymous Referee #2, 09 Nov 2022
    • AC2: 'Reply on RC2', Shibing Huang, 20 Nov 2022

Shibing Huang et al.

Shibing Huang et al.

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Short summary
1. The warming degradation mechanism of ice-filled joints were revealed. 2. The effect of temperature, normal stress, shear rate and joint opening on the shear strength of rough ice-filled joints were comprehensively investigated. 3. The shear rupture modes include shear cracking of joint ice and debonding of ice-rock interface, which is related with the above factors. 4. The bonding strength of ice-rock interface is larger than the shear strength of joint ice when the temperature is below -1°C.