冻融–受荷协同作用下砂岩细观损伤演化CT可视化定量表征

doi:10.13722/j.cnki.jrme.2022.0574

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摘要冻融循环是导致寒区受荷岩石发生加速风化破坏的重要因素，而精细化认知冻融–受荷协同作用下砂岩损伤演化及内在机制，对于准确理解寒区岩石全过程损伤特性具有重要指导价值。开展冻融–受荷协同作用下砂岩损伤过程原位CT实时扫描试验，基于CT图像交互式阈值分割和三维孔隙结构模型重建方法，实现单轴压缩过程中冻融砂岩内部孔(裂)隙演化的精细化识别和可视化定量表征，并运用格子玻尔兹曼法进行冻融–受荷协同作用下砂岩孔隙结构连通变化的三维模拟，明确冻融–受荷条件下砂岩细观结构损伤演化规律。结果表明：(1) 冻融砂岩孔(裂)隙结构损伤具有连续演进特征，但损伤演化速度存在突变现象，其中，孔(裂)隙的体积陡增可作为岩样临兆破坏信号。(2) 区别于常规加载作用，冻融后砂岩单轴压缩破坏由单一贯通剪切面的破坏向拉–剪混合破坏转变，且破坏面数量随冻融次数的增加而显著增多。(3) 岩样孔道数目随冻融次数增加而增加，且隙间连通性趋于增强；试样的最大孔隙半径、孔道数目、最大孔道半径、孔隙度等随荷载的增加而变大。冻融–受荷协同作用下砂岩压缩破坏系孔隙与孔道持续错动、扩展的累积效应的结果。(4) 低次冻融循环砂岩受荷破坏后，内部孔(裂)隙结构以小孔隙为主，裂隙占比低；而经历高次冻融循环后的砂岩，破坏后以贯通性裂纹扩展为主体，孔隙占比急剧降低。冻融作用促使受荷砂岩由持续小孔(裂)隙破坏模式向多条贯通交错的主裂纹破坏模式转变。(5) 砂岩孔隙结构的连通沿冻融和压缩荷载2条路径演化，其孔隙连通性主要由岩样内部孔道数量决定。冻融前10次是孔隙结构扩展、连通的剧烈变化阶段。

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	刘慧1
	杨更社1
	申艳军2
	叶万军1
	奚家米1
	金龙3
	魏尧3
	李博融3
	刘帅1

关键词 ：岩石力学, 冻融循环, 单轴压缩, 原位CT扫描, 交互式分割, 三维孔隙结构, 格子玻尔兹曼法

Abstract：Freeze-thaw cycle is an important factor leading to accelerated weathering failure of rock in cold regions. Fine cognition of damage evolution and internal mechanism of sandstone under the synergistic effect of freeze-thaw and load will have important guiding value for accurately understanding the whole process of damage characteristics of rock in cold regions. In this paper，the in-situ CT real-time scanning test of the sandstone damage process under the synergistic effect of freeze-thaw and load was carried out. Based on the interactive threshold segmentation of CT images and the reconstruction method of the three-dimensional pore structure model，the fine identification and visual quantitative characterization of pore(crack) evolution in freeze-thaw sandstone during uniaxial compression were realized. The lattice Boltzmann method was used to carry out the three-dimensional simulation of the connectivity change of sandstone pore structure under the synergistic effect of freeze-thaw and load，and the damage evolution law of sandstone mesostructure under the condition of freeze-thaw and load was clarified. The results show that：(1) the damage to freeze-thaw sandstone pore(fissure) structure has the characteristics of continuous evolution，but the damage evolution speed has a mutation phenomenon. Among them，the sharp increase of pore(fissure) volume can be used as a precursory failure signal of rock samples. (2) Different from conventional loading，uniaxial compression failure of sandstone after freeze-thaw changes from single through the shear plane to tensile-shear mixed failure，and the number of failure surfaces increases with the increase of freeze-thaw cycles. (3) The number of pore channels of rock samples increases with the increase of freeze-thaw cycles，and the gap connectivity tends to large；the maximum pore radius，pore number，maximum pore radius and porosity of the sample increase with the increase of load. The compression failure of sandstone under the synergistic effect of freeze-thaw and load is the product of the cumulative effect of continuous dislocation and expansion of pores and pores. (4) The internal pore(crack) structure of sandstone after loading failure in the low freezing-thawing cycle is mainly small pores，and the proportion of cracks is low；after high freeze-thaw cycles，the sandstone is dominated by the penetration crack propagation，and the porosity ratio decreases sharply. The freeze-thaw action promotes the transformation of the failure mode of the loaded sandstone from the continuous pore(crack) fracture mode to the multiple main cracks. (5) The connectivity of sandstone pore structure evolves along two paths of freeze-thaw and compression load，and its pore connectivity is mainly determined by the number of pores inside the rock sample. The first 10 freeze-thaw cycles are violent changes in pore structure expansion and connectivity.

Key words： rock mechanics freeze-thaw cycle uniaxial compression in-situ CT scanning interactive segmentation 3D pore structure lattice Boltzmann method

引用本文:

刘慧1，杨更社1，申艳军2，叶万军1，奚家米1，金龙3，魏尧3，李博融3，刘帅1. 冻融–受荷协同作用下砂岩细观损伤演化CT可视化定量表征[J]. 岩石力学与工程学报, 2023, 42(5): 1136-1149.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0574 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I5/1136

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