摘要
文中测定了广东珠海、阳江和增城三个地区的五条花岗岩风化剖面的矿物组成、含量以及粒度、密度、含水量和饱和度等物性指标 ,表明上述剖面风化残积土的构成以造岩矿物为主 ,且粘土矿物含量由上到下呈增加的趋势 ,越接近地表 ,粘土矿物的粒度就越小。除土质样品外 ,密度是按风化、弱风化及新鲜花岗岩这样的次序逐渐增加 ,而在土质样品中 ,密度的变化趋势是随深度的增加而降低。含水量随深度的增加而增加 ,但饱和度增加到一定的值后就转为降低 ,说明剖面的深部还没有达到最大的含水状态 ,含水量对土体力学性质的影响还较小。
Indices of physical properties such as mineral composition, concentration, size, density, water content and degree of saturation, etc., of five profiles of weathered granitic rocks in Zhuhai, Yangjiang and Zengcheng of Guangdong Province were measured in this project. Results demonstrate that the residual soil of the above-mentioned profiles of weathered granitic rocks is mainly composed of rock-forming minerals, the content of the clay minerals in the residual soil increases downwards along the weathered profile. Density of the granitic rocks studied in this project increase gradually in the order of weathered, weakly - weathered and fresh granitic rocks, while density of the soil samples decreases with the increase of sampling depth. The water content of weathered granitic rock increase with the increase of depth, but the degree of saturation only increases with the increase of depth to a certain value and then it will decrease. This illustrates that the maximum water content is not reached at this depth of the weathered profile, and the water content hence has only slight influence on the mechanical properties of the soil bodies.
出处
《热带地理》
北大核心
2000年第4期256-260,共5页
Tropical Geography
基金
广东省"九五"重大项目"沿海地表地质灾害的矿物动力学机制研究" (编号 :973106)
