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正确了解和评价紫色土的水理性质,是防止紫色土区产生不良环境问题和工程问题的关键。通过测定川东沙溪庙组、遂宁组、蓬莱镇组紫色土及母质理化参数、黏土矿物成分、母质水分特征曲线以及遂宁组紫色泥岩崩解率随含水量和时间变化规律,比较了3种不同黏粒含量紫色土母质水分特征曲线之间的差异,分析了遂宁组紫色泥岩在不同条件下的崩解特征。结果表明:沙溪庙组、遂宁组、蓬莱镇组紫色土黏土矿物成分主要为水云母,其次是蒙脱石等,不含其他区域紫色土中普遍存在的高岭石和蛭石,主要化学成分中的硅铝比值较其他地区紫色土中的硅铝比值低;不同母质发育而成的紫色土持水率由高到低依次为蓬莱镇组、沙溪庙组、遂宁组;快速崩解是紫色泥岩区紫色土别于其他土壤的特性之一。
Correct understanding and evaluation of the purple soil hydraulic properties, is to prevent purple soil adverse environmental problems and engineering problems of the key. Through the determination of purple soil and parent physicochemical parameters, clay mineral composition, parent material water characteristic curve of Shaximiao Formation, Suining Formation and Penglaizhen Formation, and the disintegration rate of purple mudstone of Suining Formation with the variation of water content and time, The difference between the water characteristics of purple soils and the clay content of purple soils is analyzed. The disintegration characteristics of purple mudstone in Suining Formation under different conditions are analyzed. The results show that the clay minerals in the purple soil of Shaximiao Formation, Suining Formation and Penglaizhen Formation are mainly aqua mica, followed by montmorillonite and so on, and do not contain kaolinite and vermiculite which are ubiquitous in the purple soil of other areas. The main chemical components The ratio of silicon to aluminum is lower than that of purple soil in other areas; the water holding capacity of purple soil developed from different parent materials turns from Penglaizhen Formation to Shaximiao Formation to Suining Formation in descending order; the rapid disintegration is Purple mudstone purple soil is different from other soil characteristics.