摘要
合理运用砂土的毛细特性制备具有水平和竖直沉积方向的松、密砂样,进行一系列三轴固结不排水剪切试验,分析沉积方向对砂土偏应力、应力比和孔压的影响,探讨砂土密实程度与该影响的关系.研究表明:沉积方向水平时松砂的偏应力极值比沉积方向竖直时的小.沉积方向水平时密砂偏应力发展呈应变软化特征,沉积方向竖直时密砂偏应力发展呈应变硬化特征.沉积方向水平时松砂应力比数值比沉积方向竖直时的数值小,沉积方向水平时密砂应力比数值比沉积方向竖直时的数值大.沉积方向水平时孔压发展速度比沉积方向竖直时的更快.沉积方向竖直时松砂试样更容易破坏,沉积方向水平时密砂试样更容易破坏.
The capillary effect of sand is used to prepare loose and dense sand sample with horizontal and vertical sedimentary directions. A series of triaxial shear tests in undrained condition are performed to study sedimentary direction′s influence on the deviation stress, stress ratio and pore pressure, and the relation between former influence and relative density is also discussed. The study results show that the deviation stress′s peak value of loose sand with horizontal sedimentary direction is lower than that with vertical sedimentary direction.The deviation stress development of dense sand performs a strain softening characteristic when the sedimentary direction is horizontal, and the deviation stress development of dense sand performs a strain hardening characteristic when the sedimentary direction is vertical. The stress ratio of loose sand in the condition of horizontal sedimentary direction is lower than that in the condition of vertical sedimentary direction. The stress ratio of dense sand in the condition of horizontal sedimentary direction is bigger than that in the condition of vertical sedimentary direction. The pore pressure in the condition of horizontal sedimentary direction develops faster than that in the condition of vertical sedimentary direction. The loose sand sample is easy to reach failure stage with vertical sedimentary direction, and the dense sand sample is easy to reach failure stage with horizontal sedimentary direction.
作者
罗强
李晓磊
王忠涛
LUO Qiang;LI Xiaolei;WANG Zhongtao(Academy of Civil Engineering and Architecture,Nanyang Normal University,Nanyang 473061,China;Institute of Geotechnical Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2019年第6期629-637,共9页
Journal of Dalian University of Technology
基金
国家自然科学基金资助项目(51609117)
河南省教育厅科学技术研究重点项目(14B560023)
河南省高等学校青年骨干教师培养计划资助项目(2018GGJS118)
关键词
沉积方向
毛细效应
不排水试验
剪切强度
初始各向异性
sedimentary direction
capillary effect
undrained test
shearing strength
inherent anisotropy
作者简介
罗强(1981-),男,副教授,E-mail:luoqiang1212@sina.com.
