温度影响下石窟砂岩力学特性试验研究

doi:10.13722/j.cnki.jrme.2023.0001

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摘要石窟寺所处环境长期面临着冷热交替作用，温度变化往往导致石窟围岩的力学性质发生变化。以重庆大足石刻石窟砂岩为研究对象，通过单轴压缩试验和巴西劈裂试验，对石窟砂岩的力学特性展开试验研究，分析不同温度和冷热循环条件下的石窟砂岩的应力–应变曲线、岩石强度、峰值应力和应变、弹性模量和破坏形态。结果表明：(1) 10次冷热循环后，砂岩的单轴抗压强度降低，其中相较于自然冷却，水冷却循环会显著减小砂岩的单轴抗压强度。砂岩的抗拉强度受冷却方式影响较大，低温水冷却循环下砂岩的抗拉强度最小。(2) 10次冷热循环作用后，砂岩的峰值应变降低。相较于自然冷却，水冷却循环会减小石窟砂岩的弹性模量，当冷热循环次数由5次增加到10次时，砂岩的弹性模量也会减小。(3) 砂岩在单轴压缩下的破坏模式以剪切破坏为主，而冷热循环作用后砂岩破坏模式变复杂。砂岩在巴西劈裂下的破坏形式的主要区别在于裂纹形态和数量，遇水冷却循环作用后，砂岩主裂纹由直线形向弧形转化，或产生次裂纹。

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	朱鹏熹1
	王成龙1
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	蒋思维2
	仉文岗1
	陈卉丽2

关键词 ：岩石力学, 石窟砂岩, 温度影响, 单轴压缩, 巴西劈裂, 力学特性

Abstract：Grotto temples are located in environments that are subject to long-term alternating effects of cooling and heating，and temperature variations commonly lead to changes in the mechanical properties of the grotto surrounding rock. The sandstone of the Dazu Grottoes in Chongqing was taken as the research object in this paper. The mechanical properties of grotto sandstone were investigated by uniaxial compression test and Brazil split test，and the stress-strain curve，strength，peak stress and strain，elastic modulus，and failure mode of grotto sandstone under different temperature and heating-cooling conditions were analyzed. The results show that the uniaxial compressive strength of sandstone decreased after 10 heating-cooling cycles. Compared to natural cooling，water cooling significantly reduced the uniaxial compressive strength of sandstone. The tensile strength of the sandstone was strongly influenced by the cooling method，with the lowest tensile strength under the low-temperature water cooling cycle. The peak strain of sandstone decreased after 10 heating-cooling cycles. Compared to natural cooling，water cooling cycles decreased the elastic modulus of sandstone，and it also decreased as the number of cycles increased from 5 to 10. The failure mode of sandstone under uniaxial compression was mainly shear failure，which became complex after heating-cooling cycles. The main difference of the failure modes of sandstone under Brazilian splitting was the shape and number of cracks. After water cooling cycles，the main crack of sandstone changed from linear to arc or formed secondary cracks.

Key words： rock mechanics grotto sandstone temperature effect uniaxial compression Brazilian splitting mechanical properties

引用本文:

朱鹏熹1，王成龙1，2，3，蒋思维2，仉文岗1，陈卉丽2. 温度影响下石窟砂岩力学特性试验研究[J]. 岩石力学与工程学报, 2024, 43(S1): 3310-3320.
ZHU Pengxi1，WANG Chenglong1，2，3，JIANG Siwei2，ZHANG Wengang1，CHEN Huili2. Experimental study on mechanical properties of grottoes sandstone influenced by temperature. , 2024, 43(S1): 3310-3320.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0001 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS1/3310

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