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| Study on damage and catastrophic mechanisms of the locked section of a“three-stage”rock slope in a freeze-thaw environment |
| LIU Shuai1，YANG Gengshe2，PAN Zhenxing2 |
| (1. College of Civil Engineering and Architecture，Huanghuai University，Zhumadian，Henan 463000，China；2. College of Architecture and Civil Engineering，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China) |
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Abstract The locked section is the key controlling factor of“three-stage”rockslides. In order to study the damage characteristics of the locked section of slopes in cold regions，a double-sided freeze-thaw test was carried out on the slope model，and the change of temperature field and the influence of frost heave force on the deformation during the water-ice phase transition were analyzed. Based on rock mechanics，a frost heave model considering the effect of ice wedge extrusion is established，and the mechanism of frost thaw weathering of crack slopes is investigated. The slope shoulder is frozen first，and the frozen peak advances from the shoulder into the rock mass. The fracture failure of the“three-stage”rock slope is dominated by frost heave of the tension fissure at the back edge. The frost heave force is the largest and the deformation of the locked section is the largest when the top of the rear edge tension crack drops from －3.5 ℃ to －6 ℃(the bottom of the crack drops from 0 ℃ to －2.6 ℃) and the cracking failure of the locked section also occurs at this stage. The frost heave force is positively correlated with the length of tensile fracture at the back edge，and there is no shear trace on the tensile fracture surface. By simulating the frost heave process of the tension crack at the back edge of the“three-stage”rock slope，the distribution characteristics of the displacement field and stress field of the slope and the crack propagation path of the locked section are analyzed，and the correlation between the Angle of the locked section and the frost heave cracking and the disaster mechanism of the tension crack at the back edge is revealed. The research results can provide technical reference for slope construction in cold regions.
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2024, Vol. 43 
