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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。
Taking opencut pit slope in Cangkuang as research object, the effect of wet-dry circulation caused by underground water solution, open pit pit solution and pit rise and fall on mechanical properties of altered rock was studied. Groundwater and pit water solution were adopted to analyze the anion and cation contained in water, and the pH value of each solution sample was measured. By comparing different hydrochemical solutions and carrying out rock mechanics tests under different wetting and drying cycles, the effects of water chemistry and wetting and drying cycles on the mechanical characteristics of rocks on open pit side of open pit were studied. The results show that the groundwater solution shows obvious acidity. Under the same acidic condition, with the increase of the number of wetting and drying cycles, the damage degree of altered rocks becomes larger and the acidity aggravates the damage degree of altered rocks. The stronger the acidity (N = 20). Under different pH (pH = 2, 4, and 7), the decrease of the strength of the specimen gradually increased; the acidity was the strongest (PH = 2), with the number of wet and dry cycles (n = 1, 5, 8, 15, 20) increases, the strength of the specimen decreases. Hydrochemical effects and wetting and drying cycles are important factors affecting the mechanical properties of altered rocks. According to the results of in-depth analysis, the establishment of rock shear strength parameters of the damage variables. The research results provide the foundation for the stability analysis of slope engineering and have strong engineering practice value.