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论文通过长期浸泡的方法,以陕西铜川新区龙潭水库典型的库岸边坡的砂岩为研究对象,研究了浸泡在不同化学溶液下砂岩的力学特性及其损伤劣化机制,分析了经不同化学溶液腐蚀后试样的物理力学特性随化学腐蚀时间的劣化规律.研究发现:化学腐蚀后砂岩的物理力学特性均发生不同程度的劣化,其随化学腐蚀时间的劣化规律基本一致;但不同化学溶液下试样物理力学特性的劣化程度有所差异,酸性溶液(pH=3.0)加剧了砂岩的劣化程度,中性化学溶液对其损伤劣化程度也有一定的影响,试验初期,强碱性溶液下砂岩的劣化程度最小,但随着化学腐蚀时间的加长,强碱性溶液下的劣化程度逐渐加剧,大于中性溶液下的,但仍小于酸性溶液.化学腐蚀后砂岩试样均呈现出明显的弱化趋势,其断裂韧度KIC、抗压强度和抗拉强度的劣化程度显著,但各力学特征的劣化程度存在明显的差异,其中抗压强度的劣化程度相对减小,而其KIC的劣化程度较大;同时,化学腐蚀后砂岩的断裂韧度与抗拉强度、抗压强度间的一致性比较明显,存在明显线性关系.可以利用不同化学溶液下砂岩的裂纹扩展半径r来间接说明其力学特征发生损伤劣化的程度.
In this paper, by means of long-term immersion, sandstone in typical bank slope of Longtan Reservoir in Tongchuan New Area of Shaanxi Province was taken as research object. The mechanical properties of sandstone immersed in different chemical solutions and its damage mechanism were studied. The physical and mechanical properties of the sample after the chemical corrosion time degradation law.The study found that: after chemical etching the physical and mechanical properties of sandstone all occurred in different degrees of deterioration, with the deterioration of chemical corrosion time basically the same; but under different chemical solutions The degradation degree of physical and mechanical properties is different. Acid solution (pH = 3.0) exacerbates the deterioration degree of sandstone. Neutral chemical solution also has a certain influence on the degree of damage and deterioration. In the early stage of experiment, the deterioration of sandstone under strong alkaline solution However, with the increase of chemical corrosion time, the degradation degree under the strong alkaline solution gradually aggravates, which is greater than that under the neutral solution but still less than that under the acidic solution.After the chemical etching, the sandstone samples show a significant weakening trend, The fracture toughness KIC, compressive strength and tensile strength of a significant degree of deterioration, but the degree of deterioration of the mechanical characteristics of obvious The degree of deterioration of the compressive strength is relatively reduced, while the KIC is more deteriorated. At the same time, the consistency of fracture toughness, tensile strength and compressive strength of sandstone after chemical attack is obvious, and there is a clear linear Relationship can be used under different chemical solutions of sandstone crack propagation radius r indirect description of their mechanical characteristics damage damage extent.