摘要
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。
According to the softening and disintegration feature of granite weathering soil, the granite weathered soil collected from different depths in Guangdong area was taken as the research objects in this paper. They have three colors ： red, brown and yellow. The shear strength of the three soil samples, the change in shear strength of the shear behavior of the three soil samples after ther were softened were obtained by fast shear and saturated shear test of the maximum dry density soil samples. The results show that the softening of the granite red soil with the highest weathering degree is the most serious, and the softening of the brown soil is low. Although the cohesive force and shear strength of granite topsoil with optimum moisture content are large in Guangdong area, it＇ s softening effect is strong, thus the engineering soil should be avoided when used in contact with water. At the same time, drainage and reinforcement measures should be completed during construction.
作者
刘懿韬
王俊
琚元元
王志鹏
张伟锋
Liu Yitao Wang Jnn Ju Yuanyuan Wang Zhipeng Zhang Weifeng(School of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou 51064-2 CCCC Second Harbor Engineering Co. , Ltd. , Wuhan 430014)
出处
《工程建设》
2017年第9期9-13,共5页
Engineering Construction
基金
广东省水利科技创新项目(2015-16)
广铁集团科研项目(2015K23)
广东电网有限责任公司科技项目(032000KK52160015)
2015中交二航局深茂铁路工程指挥部科研项目
关键词
花岗岩风化土
风化程度
最大干密度
饱和
抗剪强度
granitic weathering soil
weathering degree
maximum dry density
saturation
shear strength
