风干与饱和堆石料强度与变形特性试验研究
陈 鸽1,2,朱俊高1,2,袁荣宏3,王 龙1,2

(1.河海大学 岩土力学与堤坝工程教育部重点实验室,江苏 南京210098; 2.河海大学 岩土工程科学研究所,江苏 南京210098; 3.张家港市金厦房地产开发公司,江苏 张家港 215600)

粗粒土; 风干样; 饱和样; 强度特性; 变形特性; 颗粒破碎

Experimental study on strength and deformation characteristics of dry and saturated coarse-grained soils
CHEN Ge1, 2, ZHU Jungao1,2, YUAN Ronghong3, WANG Long1,2

(1. Key Laboratory of Ministry of Education for Geotechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China; 3.Zhangjiagang Jinsha Real Estate Co.,Ltd, Zhangjiagang 215600, China)

coarse-grained soil; air-dried sample; saturated sample; strength characteristics; deformation characteristics; particle breakage

DOI: 10.15986-j.1006-7930.2019.06.012

备注

风干和饱和状态下粗粒土的强度和变形特性有显著差异.为研究此差异,对两河口心墙坝堆石料风干样及饱和样进行了三轴固结排水试验,对比分析了其风干样及饱和样的强度特性、变形特性差异.试验结果表明:风干样与饱和样的峰值偏应力与围压呈显著的幂函数关系,且随着围压的增大,两者差值逐渐增大; 同一围压下,风干样的内摩擦角大于饱和样,但两者的差值随着围压的增大而减小,内摩擦角差值与围压的关系可以用幂函数来描述; 在相同围压下,同一轴变对应的风干样体应变及侧向应变均小于饱和样,且风干样的颗粒破碎率小于饱和样,两者的颗粒破碎率均随着围压的增大而线性增加.

The strength and deformation characteristics of coarse-grained soil under air-dried and saturated conditions are significantly different. The triaxial consolidation tests were carried out to study the difference between air-dried samples and saturated samples of rockfill materials in the core wall dam of the two estuary. The strength and deformation characteristics of them were compared and analyzed. The results show that there is a significant power function relationship between peak deflection stress and confining pressure of them, and the difference between them increases gradually with the increase of confining pressure. The internal friction angle of air-dried sample is large than that of saturated sample, but the difference between them decreases with the increase of confining pressure. The relationship between the difference of internal friction angle and confining pressure can be described by power function. Under the same confining pressure and axial strain, the volume strain and lateral strain of the air-dried samples are smaller than those of the saturated samples. Under the same confining pressure, the particle breakage rate of air-dried samples is less than that of saturated samples, while the particle breakage rate of them increase linearly with the increasing confining pressure.