降雪、温差作用下大尺寸砂岩风化模拟试验研究

doi:10.13722/j.cnki.jrme.2023.1003

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摘要砂岩质石窟寺在冻融循环作用下，会引起不同程度的风化病害。以甘肃北石窟寺为研究对象，以所处赋存环境的多因素变量耦合关系为依据，在多场耦合实验室开展降雪–温差条件下的大尺寸砂岩风化模拟试验。结果表明，反复的降雪–温差作用下，在微观上，冻胀消融使得砂岩表现出表层砂岩胶结物几乎全部消失，内部砂岩胶结方式以接触式为主以及孔隙增多增大的劣化特征；宏观上，呈现出水分入渗深度增大、损伤区域及损伤程度逐步扩展，并伴随着起翘脱落、变色加深、裂隙发育的表观现象，力学上，表现为强度逐渐降低的趋势，并根据不同岩性砂岩划分出5类响应敏感区域，揭示了降雪–温差作用下砂岩的渐进累计风化机制。

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	刘晓颖1
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	郭青林1
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	张博1
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	尚东娟1
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	裴强强1
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关键词 ：岩石力学, 砂岩, 石窟寺, 冻融循环, 降雪&ndash, 温差, 多因素变量耦合, 风化机制

Abstract：Sandstone grotto temples are subject to varying degrees of weathering damage when exposed to freeze-thaw cycles. This study focuses on the North Grottoes in Gansu，employing a multi-faceted approach based on the coupled relationships of numerous environmental factors. Large-scale sandstone weathering simulations were conducted in a sophisticated multi-field coupling laboratory under conditions emulating snowfall-temperature variations. The findings reveal that repetitive snowfall-temperature fluctuations induce freeze-thaw cycles，causing significant microstructural changes in the sandstone. At the microscopic level，freeze-thaw cycles result in the nearly complete dissolution of surface sandstone cementation. Internally，the sandstone exhibits a degradation characterized by a predominant contact-type cementation breakdown，accompanied by a noticeable increase in pore volume and size. Macroscopically，there is a discernible augmentation in the depth of moisture infiltration，coinciding with a progressive expansion of damaged regions and an intensification in the severity of observed deterioration. Surface manifestations include warping，detachment，deepening discoloration，and widening of cracks. Mechanically，there is a gradual decline in strength. Moreover，a categorization of five distinct response-sensitive zones was established based on different sandstone rock types. This classification sheds light on the progressive cumulative weathering mechanism of sandstone under the influence of snowfall-temperature fluctuations.

Key words： rock mechanics sandstone grotto temple freezing-thawing cycles snowfall-temperature fluctuations coupling of multiple variables and factors weathering mechanism

引用本文:

刘晓颖1，2，3，4，郭青林1，2，4，张博1，2，4，尚东娟1，2，3，4，余静1，2，3，4，裴强强1，2，4. 降雪、温差作用下大尺寸砂岩风化模拟试验研究[J]. 岩石力学与工程学报, 2024, 43(6): 1519-1534.
LIU Xiaoying1，2，3，4，GUO Qinglin1，2，4，ZHANG Bo1，2，4，SHANG Dongjuan1，2，3，4，YU Jing1，2，3，4，PEI Qiangqiang1，2，4. Simulation experiment study on large-size sandstone weathering under coupling effect of snow and temperature#br#. , 2024, 43(6): 1519-1534.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.1003 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I6/1519

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