摘要
凝灰岩残积土广泛分布于赣南一带,研究其工程特性对当地工程建设以及地质灾害的防治具有重要意义。在赣南地区采取典型的凝灰岩残积土原状样和重塑样,进行了基本的物理力学性质试验以及三轴固结不排水剪切试验,对其基本物理力学性质、抗剪强度特性以及结构等方面的工程特性进行了研究。试验结果表明:凝灰岩残积土依据其塑性指数和颗分曲线,可定名为粉质黏土,其孔隙比为0.91,土体渗透系数为2.25×10-7 m/s,渗透能力较差;凝灰岩残积土原状样的抗剪强度参数为c=14kPa、φ=15.63°,c′=7.83、φ′=28°,重塑样的抗剪强度参数为c=11.99kPa、φ=22.6°,c′=5.08、φ′=30.58°;凝灰岩残积土原状样的总内聚力、有效内聚力均略大于重塑样,而原状样的总内摩擦角、有效内摩擦角均略小于重塑样。
Tuff residual soil is widely distributed in south Jiangxi Province of China. It has great significance for engineering construction and geological disaster prevention and control to study its engineering charac- teristics. With samples of typical undisturbed and remoulded tuff residual soil in south Jiangxi,this paper conducts experiments on basic physical and mechanical properties and consolidated undrained triaxial compression in order to research their engineering characteristics of physical and mechanical properties, shear strength and structure. The results indicate that based on the plasticity index and grain size accumulation curve, the tuff residual soil can be named as silty clay with poor penetration ability as the pore ratio is 0.91 and the permeability coefficient is 2.25 ×10^-7 m/s. The shear strength parameters of the undisturbed tuff residual soil are c=14 kPa,φ=15.63°,c＇=7.83 and φ＇=28°,and those of the remoulded tuff residual soil are c=11.99 kPa,φ=22.6°,c＇=5.08 and φ＇=30.58°. The total cohesion and effective cohesion of the un- disturbed tuff residual soil samples are slightly larger than that of the remoulded samples;the total internal friction angle and effective internal friction angle of the undisturbed tuff residual soil samples are slightly smaller than that of the remoulded samples.
作者
卢游
简文星
王立宸
蒋毅
LU You JIAN Wenxing WANG Lichen JIANG Yi(Faculty of Engineering, China University of Geosciences , Wuhan 430074, Chin)
出处
《安全与环境工程》
CAS
2017年第1期16-21,共6页
Safety and Environmental Engineering
基金
江西省交通厅科技计划项目(2015c0026)
关键词
凝灰岩残积土
物理力学特性
应力-应变关系
抗剪强度
tuff residual soil
physical and mechanical characteristics
stress-strain relation
shear strength
