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通过X射线衍射分析法定量分析珠江三角洲软土的矿物组成,并采用乙二醇乙醚吸附法(EGME法)测试人工土样与天然土样的总比表面积,研究黏土矿物与非黏土矿物对土体强度特性变化的影响。经分析后发现:黏土矿物(如蒙脱石)通常为片状颗粒,具有很大的比表面积,故吸附的结合水膜较厚,颗粒间的直接接触点较少,颗粒间由结合水膜连接的胶结作用明显,粒间由于易于错动而形成润滑摩擦,表现为抗剪强度与内摩擦角低,黏聚力高;非黏土矿物颗粒(如石英)通常为粒状或针状,比表面积小,吸附水膜较薄,黏聚力较低,粒间大多为直接接触使得摩擦角增加,从而其强度得以增加。
The mineral composition of soft soil in the Pearl River Delta was quantitatively analyzed by X-ray diffraction analysis. The total specific surface area of artificial soil samples and natural soil samples was tested by EGME method. The effects of clay minerals and non-clay minerals on soil Effect of changes in body strength characteristics. The analysis found that: clay minerals (such as montmorillonite) is usually flaky particles, with a large specific surface area, so the adsorption of the water film is thicker, less direct contact between the particles, the particles by the combination of water film The cementation effect of the connection is obvious, the inter-particle frictional friction is formed due to the easy dislocation, which is characterized by low shear strength and low internal friction angle and high cohesion. Non-clay mineral particles (such as quartz) are usually granular or needle- Small, thin film adsorption water, cohesion is low, most of the inter-particle direct contact makes the friction angle increases, so its strength can be increased.