水化学作用及干湿循环对蚀变岩力学性质影响研究

发布时间：2018-08-02 09:00

【摘要】：以仓上露天矿坑边坡为研究对象,研究地下水溶液、露天矿坑水溶液以及矿坑水位升降引起的干湿循环作用对蚀变岩石力学性质的影响。现场采取地下水和矿坑水溶液,分析水中赋存的阴阳离子,并测得各溶液样本的pH值。通过配比不同水化学溶液及进行不同干湿循环作用下的岩石力学试验,探究水化学作用及干湿循环作用对仓上露天矿坑边坡岩石的力学特性损伤特征。结果表明:地下水溶液呈明显的酸性,同一酸性条件下,随着干湿循环次数的增大,蚀变岩的损伤程度逐渐变大,酸性增强加剧蚀变岩的损伤程度,酸性越强(pH越小),试件的强度降低幅度越大,干湿循环次数最大(n=20),在不同pH下(pH=2,4,7),试件强度降低幅度逐渐增大;酸性最强条件下(pH=2),随干湿循环次数下(n=1,5,8,15,20)增加,试件强度降低幅度也逐渐增大。水化学作用及干湿循环是影响蚀变岩力学特性的重要因素。根据对结果深入分析,建立岩石抗剪强度参数的损伤变量。研究成果为边坡工程的稳定性分析提供基础,具有较强的工程实践价值。
[Abstract]:Taking Cangshang opencast pit slope as the research object, the effects of underground water solution, open-pit water solution and the dry and wet cycle caused by water level rise and fall of mine pit on the mechanical properties of altered rock are studied. Ground water and pit water were used to analyze the anion and anion in the water, and the pH value of each solution was measured. The damage characteristics of rock mechanical properties of Cangshang opencast pit slope were investigated by hydrochemical action and dry wet cycle under different hydro chemical solution and dry wet cycle. The results show that the underground aqueous solution is obviously acidic. Under the same acid condition, with the increase of dry-wet cycle times, the degree of damage of altered rock becomes larger, and the degree of damage of altered rock is aggravated by acid enhancement. The stronger the acidity (pH) was, the greater the intensity of the sample was, and the maximum number of dry and wet cycles (nn ~ (20) was observed, and the decrease of the strength of the specimen increased gradually at different pH (pH ~ (2 +) ~ (2) ~ (4) ~ (4), and the intensity decreased gradually under the condition of the strongest acidity (pH=2) with the increase of dry and wet cycle times (n ~ (1) ~ (1) (n ~ (1) ~ (1) ~ (1) ~ ( The strength of the specimen also increases gradually. Hydrochemistry and dry-wet cycle are important factors affecting the mechanical properties of altered rocks. Based on the analysis of the results, the damage variables of rock shear strength parameters are established. The research results provide the foundation for the stability analysis of slope engineering and have strong engineering practice value.
【作者单位】：山东省防灾减灾重点实验室;临沂大学建筑学院;山东科技大学矿业与安全工程学院;
【分类号】：TU45

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