Jul 2026· Fatigue & Fracture of Engineering Materials & Structures· Vol 49, pp. 4313-4333· 0 citations· 19 references
Abstract
In high‐altitude cold regions, ice–water phase change during freezing expands ice and compresses trapped gas in unsaturated rock cracks, whereas temperature gradients induce thermal stress, jointly driving crack initiation. This study derives governing equations for ice–gas mechanics, establishes stress intensity factors induced by heat flux, and formulates an MTS‐based initiation criterion. The effects of freezing temperature, saturation, and heat flux on key crack initiation parameters are analyzed. Within the considered parameter range, freezing pressure, ice–rock interfacial friction, and fissure gas pressure increase as freezing temperature decreases, whereas fissure gas pressure rises sharply under high saturation, making crack initiation mainly tensile. When heat flux intensity exceeds 1000 mW/m
2
, shear effects intensify, and the initiation mode evolves from tensile‐dominated to tensile–shear‐mixed or shear‐dominated. As
q
increases, the tangential stress changes from cosine‐ to sine‐type distribution, whereas
θ
0
decreases in the negative angle range and increases in the positive angle range, with the peak generally shifting rightward.
Thermal shock serves as a potential stimulation method for hot dry rock (HDR); however, the mechanisms through which it induces reservoir damage and improves permeability remain to be thoroughly investigated. To address this issue, laboratory mechanical tests under gradient thermal shock temperatures ranging from 300...
Qi Niu, Yun-Tian Wu, Zi-Jian Zhang et al.· Journal of Petroleum Geology· 0 citations
Clayey slip surfaces control the reactivation and long-term deformation of slow-moving landslides and may experience thermal fluctuations from climate, seasonal ground-temperature changes, or subsurface heat sources. Experiments show that residual shear strength depends on temperature and shearing rate, yet most numeri...
S. Tourchi, E. Badakhshan, Milad Jabbarzadeh et al.· 1 citation
Rock–ice avalanches and repeated freeze–thaw cycles pose coupled challenges to baffle-type mitigation structures in high-altitude cold regions. This study used controlled small-scale pull-out tests to quantify changes in baffle–soil friction over 0–30 freeze–thaw cycles and then calibrated a discrete element method (DE...
Frost heave and thaw settlement from cyclic freezing and thawing (F-T) damage infrastructure like roadbeds in cold regions. Geogrids can help control this damage, but their mechanism in complex F-T processes is unclear. This study uses lab tests to examine how geogrids affect moisture, temperature, and deformation in l...
Wu-Yu Zhang, Zheng-Xi Yu, Yong-Zhen Feng et al.· E3S Web of Conferences· 0 citations
Subglacial drilling through polar ice–rock transitional zones is frequently hindered by severe load fluctuations and instability induced by strong formation heterogeneity. This study investigates the coupled drilling mechanics across pure ice, an ice–rock mixture, and bedrock using a fracture-mechanics-based finite–dis...
Zong-Jie Mu, Jingna Yan, Zhaowei Sun et al.· Applied Sciences· 0 citations
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