| 酸腐蚀作用下川渝红层砂岩蠕变特性试验研究 |
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| 引用本文： | 谢妮,王丁浩,吕阳,高青.酸腐蚀作用下川渝红层砂岩蠕变特性试验研究[J].地质科技通报,2022,41(5):141-149. |
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| 作者姓名： | 谢妮 王丁浩 吕阳 高青 |
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| 作者单位： | 中国地质大学(武汉)工程学院, 武汉 430074 |
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| 基金项目： | 国家自然科学基金项目4187071735 |
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| 摘 要： | 岩石蠕变特性对岩体工程的长期稳定有着重要影响, 尤其是在酸雨等水化学作用下, 岩石的细观结构遭到破坏, 蠕变特性及变形更为显著。以重庆二佛寺红层砂岩为研究对象, 通过开展室内三轴压缩分级蠕变试验, 研究了酸腐蚀状态下砂岩的蠕变特性。结果表明: 酸的腐蚀和浸泡会使砂岩内部孔隙增加, 导致砂岩在第一级荷载下会产生较大的瞬时应变和蠕变量, 之后瞬时应变量和蠕变量随着应力增加而增大; 岩样受到腐蚀软化, 蠕变破坏强度为抗压强度的76%, 长期强度仅为抗压强度的54%。为了描述蠕变全过程, 建立了一个损伤蠕变模型来拟合试验数据, 验证了其适用性, 可以为岩土工程建设的稳定性提供参考。
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| 关 键 词： | 砂岩 蠕变试验 蠕变损伤模型 酸腐蚀作用 |
| 收稿时间： | 2021-08-20 |
Experimental study on creep behaviors of red sandstone in Sichuan and Chongqing under acid corrosion |
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| Affiliation: | Faculty of Engineering, China University of Geosciences(Wuhan), Wuhan 430074, China |
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| Abstract: | The creep characteristics of rock have an important effect on the long-term stability of rock engineering. Especially under the action of acid rain and other water chemistry, the rock microstructure is destroyed, and the creep characteristics and deformation are more significant. With the red sandstone of the Erfo Temple in Chongqing as the research object, the creep characteristics of sandstone under acid corrosion are studied by triaxial compression creep test. The results show that the porosity of sandstone increases with acid corrosion and immersion, which leads to the large instantaneous strain and creep of sandstone under the first stage load, and then the instantaneous strain and creep increase with the increase in stress. The creep strength is 76% of the compressive strength, and the long-term strength is only 54% of the compressive strength. To describe the whole creep process, a damage creep model is established to fit the test data, and its applicability is verified, which provides a reference for geotechnical engineering construction. |
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