Enhancing Shear Strength of Weakly Consolidated Mudstone in Water-Diversion Tunnels Through Artificial Ground-Freezing Techniques: An Experimental and Theoretical Study DOI Open Access

Hoang Anh Quan,

Wenzhi Zhang, Junjie Li

et al.

Water, Journal Year: 2024, Volume and Issue: 16(21), P. 3095 - 3095

Published: Oct. 29, 2024

The utilization of artificial ground-freezing techniques is increasingly prevalent in the construction water-diversion tunnels. inadequate mechanical properties weakly consolidated mudstone (WCM) pose significant challenges for tunneling construction. In this study, a series triaxial shear tests were conducted on frozen specimens WCM to elucidate its strength characteristics. experiment involved four freezing temperatures (0, −5, −10, and −20 °C) confining pressures (1, 2, 3, 4 MPa). results indicate that failure mode exhibits distinct zone characteristics under conditions, particularly prominent lower temperature environments. As gradually decreases, there substantial increase over 200% specimens, accompanied by corresponding decrease yield strain. Furthermore, cohesion internal friction angle as following complex exponential function relationship rather than linear one. decreases from 0 °C °C, an 1012 kPa 1425 kPa, rise 43.2° 58.1°. Notably, application pressure exerts pronounced influence WCM, with elevated levels resulting augmentation strength. significantly influenced temperatures. At low temperatures, specimen behavior, while at high it predominantly demonstrates expansion failure. This phenomenon can be attributed increased brittleness caused ice crystals, rendering more susceptible brittle shearing forces. These findings signify enhancement behavior within tunnel sidewall conditions.

Language: Английский

Enhancing Shear Strength of Weakly Consolidated Mudstone in Water-Diversion Tunnels Through Artificial Ground-Freezing Techniques: An Experimental and Theoretical Study DOI Open Access

Hoang Anh Quan,

Wenzhi Zhang, Junjie Li

et al.

Water, Journal Year: 2024, Volume and Issue: 16(21), P. 3095 - 3095

Published: Oct. 29, 2024

The utilization of artificial ground-freezing techniques is increasingly prevalent in the construction water-diversion tunnels. inadequate mechanical properties weakly consolidated mudstone (WCM) pose significant challenges for tunneling construction. In this study, a series triaxial shear tests were conducted on frozen specimens WCM to elucidate its strength characteristics. experiment involved four freezing temperatures (0, −5, −10, and −20 °C) confining pressures (1, 2, 3, 4 MPa). results indicate that failure mode exhibits distinct zone characteristics under conditions, particularly prominent lower temperature environments. As gradually decreases, there substantial increase over 200% specimens, accompanied by corresponding decrease yield strain. Furthermore, cohesion internal friction angle as following complex exponential function relationship rather than linear one. decreases from 0 °C °C, an 1012 kPa 1425 kPa, rise 43.2° 58.1°. Notably, application pressure exerts pronounced influence WCM, with elevated levels resulting augmentation strength. significantly influenced temperatures. At low temperatures, specimen behavior, while at high it predominantly demonstrates expansion failure. This phenomenon can be attributed increased brittleness caused ice crystals, rendering more susceptible brittle shearing forces. These findings signify enhancement behavior within tunnel sidewall conditions.

Language: Английский

Citations

0