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针对花岗岩风化土易软化、崩解的特点,以广东地区取自表层不同深度的花岗岩风化土为研究对象,风化土主要分为三种颜色,分别为:红色、褐色和黄色,通过对最大干密度下的土样进行快剪及饱和快剪试验,得出三种土样的抗剪强度及饱和后软化土样抗剪强度的变化及其抗剪特性。结果表明,风化程度最高的花岗岩红土在遇水后软化现象最为严重,褐土在三者中软化程度较低。广东地区花岗岩表层土虽在最优含水率时黏聚力及抗剪强度大,但是其遇水软化作用强烈,工程用土若需接触水时应尽量避免使用,同时在施工时遇到此类土体应做好排水及加固等措施。
In view of the characteristics of granite weathered soil easy to soften and disintegrate, taking the granite weathered soil from different depths in the surface of Guangdong as the research object, the weathered soil is divided into three colors: red, brown and yellow, Density soil samples were subjected to fast shear tests and fast shear tests to obtain the shear strength of three kinds of soil samples and the change of shear strength after softening soil samples and their shear properties. The results show that the granite laterite with the highest degree of weathering is the most severely softened after being exposed to water and the cinnamon is less softened by the three. Although the cohesion and shear strength of the granite topsoil in Guangdong Province at the optimal moisture content are large, its water softening effect is strong. When the engineering soil needs to be exposed to water, it should be avoided as much as possible, and at the same time such a soil is encountered during construction Body should be well drained and reinforced measures.