水化学及冻融循环对砂岩物理力学特性试验研究

发布时间：2018-06-29 23:09

本文选题：水化学 + 冻融循环　；参考：《科学技术与工程》2017年31期

【摘要】：以寒区砂岩为研究对象,考虑水化学溶液的侵蚀和冻融循环的影响,开展不同酸性条件下岩石冻融循环试验,引入岩石损伤变量,定量分析砂岩力学损伤规律。结果表明:随着酸性增强及冻融循环次数的增大,砂岩的弹性模量、抗压强度逐渐减小,砂岩内部损伤逐渐增大;酸性条件与冻融循环的耦合作用加剧岩石的损伤,酸性最强条件下(p H=2),经历60次冻融循环试件弹性模量、抗压强度下降55.70%和54.57%;分析砂岩的弹性模量、抗压强度及损伤变量与冻融循环次数关系,定量关系可表征为指数变化关系。建立岩石力学参数损伤变量,对水化学冻融循环耦合机理进行研究,探究岩石力学性质的劣化机制。研究成果将为不同水化学条件下寒区工程长期稳定性分析提供试验依据。
[Abstract]:Taking sandstone in cold region as the research object, considering the influence of hydrochemical solution erosion and freeze-thaw cycle, the freezing and thawing cycle tests of rocks under different acidic conditions were carried out, and rock damage variables were introduced to quantitatively analyze the mechanical damage law of sandstone. The results show that the elastic modulus and compressive strength of sandstone decrease gradually and the internal damage of sandstone increases with the increase of acidity and the times of freeze-thaw cycle, and the coupling effect of acid condition and freeze-thaw cycle intensifies the damage of rock. Under the most acidic condition (pH ~ (2), the elastic modulus of the specimen experienced 60 freeze-thaw cycles, the compressive strength decreased by 55.70% and 54.57%, and the relationship between the elastic modulus, compressive strength and damage variable of sandstone and the number of freeze-thaw cycles was analyzed, and the quantitative relationship could be characterized as an exponential change. The damage variable of rock mechanical parameters was established and the coupling mechanism of hydrochemical freeze-thaw cycle was studied to explore the deterioration mechanism of rock mechanical properties. The research results will provide experimental basis for long-term stability analysis of cold region engineering under different hydrochemical conditions.
【作者单位】：焦作大学土木建筑工程学院;
【分类号】：TU45

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