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Experiment on degradation characteristics of metamorphic sandstone in desert oasis areas under freeze-thaw cycles(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2026年01期
Page:
43-54
Research Field:
道路工程
Publishing date:

Info

Title:
Experiment on degradation characteristics of metamorphic sandstone in desert oasis areas under freeze-thaw cycles
Author(s):
ZHU Chun-sheng1; 2; 3;  YANG Xiao-hua1;  JING Guo-bin1; 4;  SUN Wei-feng5; 6; 7; YAN Chang-gen1;  LITIFU Wa-yi-ti1; 2
Keywords:
road engineering;  rock slope;  freeze-thaw cycle;  metamorphic sandstone;  deterioration damage
PACS:
TU45
DOI:
10.19721/j.cnki.1671-8879.2026.01.003
Abstract:
In response to the condition where the long-term freeze-thaw action in the arid oasis region of Xinjiang leads to the deterioration and damage of metamorphic sandstone, thereby affecting the deformation stability of shallow slopes, the metamorphic sandstone of the Awu-A(from Aksu via Wushi to Aheqi)highway slope was selected as the research subject, three sets of conditions(FT-1, FT-2, and FT-3, with temperatures ranging from -10 ℃ to 20 ℃, -20 ℃ to 20 ℃, and -30 ℃ to 20 ℃, respectively)were designed for freeze-thaw cycle tests. The changes in the apparent damage stage, physical response parameters, and mechanical behavior parameters of the metamorphic sandstone were analyzed, revealing the deterioration and damage characteristics of the metamorphic sandstone under freeze-thaw conditions. The findings indicate that the greater the number of freeze-thaw cycles, the more severe the deterioration and damage of the metamorphic sandstone. The apparent damage stages progress sequentially as the appearance of deteriorated particles, rock debris shedding, initiation of micro-cracks, and crack propagation and connection. As the number of freeze-thaw cycles increases, the saturated water content initially rises and then stabilizes, the longitudinal wave velocity decreases and stabilizes, and the mass change follows an initial increase followed by a decrease. The critical threshold for significant changes in the physical parameters of the rock samples is achieved after 30 freeze-thaw cycles. With more freeze-thaw cycles, the stress-strain curve of the rock samples shows a reduction in peak stress, a peak strain that first decreases and then increases, an extended compaction stage, a shortened elastic stage, a slower post-peak stress drop, and gradually increasing plasticity. Under the FT-3 condition, the uniaxial compressive strength and elastic modulus of the rock samples exhibit the most significant changes, decreasing by 48.83% and 60.98%, respectively. The relationship between the freeze-thaw damage variable and the freeze-thaw cycle coefficient conforms to an exponential function, with rapid nonlinear growth in the early stages and a gradual stabilization in the later stages. The lower the preset minimum environmental temperature, the higher the degree of deterioration. These findings provide valuable insights for understanding the deterioration and damage of metamorphic sandstone in the arid oasis region of Xinjiang under freeze-thaw cycles.2 tabs, 13 figs, 21 refs.

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Last Update: 2026-02-20