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由于泥质岩富含黏土矿物,尤其是成岩程度较低的中新生代泥质岩常具有显著的膨胀性,而成为膨胀岩的主要类型。在对现有膨胀岩判别指标进行全面分析后,提出以蒙脱石含量、胶结系数和比表面积作为泥质岩膨胀性判别与分级的三大指标。基于投影寻踪模型方法,以新疆大坂隧洞工程中采集的20个泥质岩样为样本进行了分析。根据20个样本最优投影值的移动平均趋势线,该处泥质岩的膨胀性可分为非膨胀、微膨胀、弱膨胀和强膨胀4个等级。与较为常用的岩块干燥饱和吸水率指标判别结果基本一致,结果表明,所选指标和方法是可靠的。
Because the mudstone is rich in clay minerals, especially the Mesozoic-Cenozoic muddy rocks with low diagenesis often have significant expansibility and become the main type of expansive rock. After a comprehensive analysis of the existing expansive discriminant indexes, it is proposed that the montmorillonite content, the cementation coefficient and the specific surface area are taken as the three indexes for discriminating and classifying the expansiveness of the mudstone. Based on the projection pursuit model, 20 argillaceous samples collected from the tunnel project in Osaka, Osaka were analyzed. According to the moving average trend line of the optimal projection values of 20 samples, the expansiveness of the shale here can be divided into four levels of non-expansion, slight expansion, weak expansion and strong expansion. Compared with the commonly used index of saturated water absorption of dry block, the results show that the selected indexes and methods are reliable.