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基于正交试验方案,研究了温度、卤水浓度及浸泡时间3个因素对泥岩夹层软化的影响规律。分别运用极差分析法和方差分析法对试验结果进行分析。对任意两个影响因素分别进行二元线性回归,根据其标准回归系数对泥岩夹层单轴抗压强度及弹性模量相对重要性比值构建判断矩阵,运用层次分析法计算各个影响因素的权值。试验结果表明:温度和浸泡时间在泥岩夹层软化过程中起着决定作用,影响权重达到98%以上;浸泡时间的影响最大,权重达到80%;卤水浓度的变化对泥岩夹层软化影响较微弱,在实际的工程中可以忽略不计。随着浸泡时间的延长和温度的升高,泥岩夹层内部裂隙逐渐被溶液侵入,单轴抗压强度和弹性模量呈递减趋势。鉴于卤水浓度影响甚微,仅利用温度和浸泡时间建立了软化方程。
Based on the orthogonal experiment scheme, the effect of temperature, brine concentration and soaking time on the softening of interlayer in mudstone was studied. Analysis of test results by using range analysis and variance analysis respectively. Based on the standard regression coefficient, the judgment matrix is established based on the standard regression coefficient of the uniaxial compressive strength of mudstone interlayer and the relative importance of elastic modulus. The analytic hierarchy process is used to calculate the weight of each influencing factor. The results show that the temperature and soaking time play a decisive role in the softening process of mudstone interlayer, and the influence weight is up to over 98%. The influence of immersion time is the largest and the weight is up to 80%. The change of brine concentration has a weak influence on the softening of mudstone interlayer. The actual project can be ignored. With the extension of immersion time and temperature, the internal cracks in mudstone intercalation gradually invaded by solution, and the uniaxial compressive strength and elastic modulus decrease gradually. In view of the little influence of brine concentration, only the softening equation is established using temperature and immersion time.