周其健, 郭永春, 屈智辉, 等. 2022. 水热综合作用下钙芒硝盐岩强度等参数的衰减规律研究[J]. 工程地质学报, 30(4): 1019-1027.doi: 10.13544/j.cnki.jeg.2020-012.
    引用本文: 周其健, 郭永春, 屈智辉, 等. 2022. 水热综合作用下钙芒硝盐岩强度等参数的衰减规律研究[J]. 工程地质学报, 30(4): 1019-1027.doi: 10.13544/j.cnki.jeg.2020-012.
    Zhou Qijian, Guo Yongchun, Qu Zhihui, et al. 2022. Strength decay law of glauberite salt rock with water and temperature[J]. Journal of Engineering Geology, 30(4): 1019-1027.doi: 10.13544/j.cnki.jeg.2020-012.
    Citation: Zhou Qijian, Guo Yongchun, Qu Zhihui, et al. 2022. Strength decay law of glauberite salt rock with water and temperature[J]. Journal of Engineering Geology, 30(4): 1019-1027.doi: 10.13544/j.cnki.jeg.2020-012.

    水热综合作用下钙芒硝盐岩强度等参数的衰减规律研究

    STRENGTH DECAY LAW OF GLAUBERITE SALT ROCK WITH WATER AND TEMPERATURE

    • 摘要: 为了研究钙芒硝盐岩在水热综合作用下强度等参数的衰减规律,通过自行研制的实验装置,模拟了钙芒硝盐岩在30~70℃温度的蒸馏水中的浸泡实验。在浸泡40d过程中,测试了钙芒硝盐岩的单轴抗压强度、弹性模量、纵波波速、破坏模式等参数,总结了浸水前后钙芒硝盐岩参数随时间、温度的变化规律;通过偏光显微镜对比观察了在浸泡前后钙芒硝盐岩微观结构的变化特征;分析了成分、结构、时间、温度等因素对钙芒硝盐岩强度等参数衰减的影响。研究结果表明:(1)钙芒硝盐岩强度随浸泡时间的增加衰减剧烈。浸泡7d后,钙芒硝盐岩强度衰减为初始强度的50% ~72%。浸泡30~40d后,钙芒硝盐岩强度衰减至初始强度的10%以下。(2)钙芒硝盐岩在长时间的浸泡过程中,主要是其中的可溶成分的溶解、溶蚀作用导致了钙芒硝盐岩结构的劣化。(3)在实验温度(30~70℃)范围内,钙芒硝等矿物的溶解过程大致经历了溶解度先增大后减小的过程,钙芒硝盐岩强度存在先减小后增大的变化,但在相同浸泡时间下各浸泡温度间强度差值小于初始强度的10%,钙芒硝盐岩强度随浸泡温度(30~70℃)变化不大。论文研究成果深化了盐渍岩土,尤其是钙芒硝盐岩水岩相互作用的认识,同时也为盐渍岩土工程问题提供了理论参考。

       

      Abstract: This paper studies the strength decay law of the glauberite salt rock of Guankou formation of Cretaceous in Southwest China under actions of water and temperature. It simulates the immersion test of glauberite salt rock sample in distilled water at a temperature of 30~70℃ by a home-made test device. During the 40-day immersion,we test the uniaxial compressive strength,elastic modulus,P-wave velocity,and failure mode of the glauberite salt rock. We summary the changes of the rock parameters with time and temperature before and after water immersion through the curves of the parameters versus the time or the temperature. We analyze the characteristics of rock microstructure changes before and after soaking by polarizing microscope. We examine the influence of composition,structure,time,temperature and other factors on the strength attenuation of the glauberite salt rock. We put forward some valuable conclusions. They are a new supplementary research results of the influence of water and temperature on the strength of glauberite salt rock. The rock strength decays sharply with increasing soaking time. After 7 days of immersion,the rock strength decays 50% to 72% of the initial strength. After 16 days of immersion,the rock strength decays 21%to 47% of the initial strength. After soaking for 30 to 40 days,the rock strength decays to 10% of the initial strength. The test data proves the same attenuation law of strength parameters such as uniaxial compressive strength,elastic modulus,and P-wave velocity of glauberite salt rock over immersion time. The dissolution and corrosion of the soluble components in glauberite salt rock are the fundamental factors affecting the strength decay of salt rock. The solubility of minerals such as glauberite,anhydrite,and gypsum in glauberite salt rock is slightly affected by temperature in the test temperature range of 30~70℃. Under the same immersion time,the strength difference between each immersion temperature is less than 10% of the initial strength. The immersion time can attenuate the strength of glauberite salt rock by more than 90%. Therefore,we consider that the more important external factor that affects the strength attenuation of glauberite salt rock is the soaking time. The research results have deepened the understanding of the water-rock interaction of saline rock,especially glauberite salt rock,and also provide a data reference for the problems of saline rock and soil engineering.

       

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