岩土力学Issue(z2)：67-73,7.
基于大型直剪试验的强风化粗粒料剪胀特性试验研究
Dilatant behavior of intensely weathered coarse-grained soils in large-scale direct shear tests
摘要
Abstract
Shear dilatancy is one of the most common phenomena of geological materials. A series of experiments were conducted in a newly manufactured large-scale direct shear apparatus to study the dilatant behavior of intensely weathered coarse-grained soils, including that 3 groups of various moisture contents, 4 groups of various shearing rates and 5 groups of various gravel contents samples were tested, respectively. Dependence of vertical and horizontal displacements on the applied normal stress was analyzed. The results show that when other controlling conditions are fixed, the shear shrinkage increases with the applied normal stress. The maximum shrinkage increases with the increase of moisture content or the decrease of shearing rate;and the shrinkage of samples with gravel content less than 30% is significantly larger than that with higher gravel content. Our results suggested that for those samples with gravel content less than 50%, the effect of fine content became significant, so that the samples show a strain-softening behavior;and the dilation tends to a fixed value. It is shown that the two-dimensional dilation formulation proposed by Matsuoka is not applicable to the coarse-grained materials. Instead of the formulation, a quadratic polynomial can be adopted to represent the relationship between the stress ratio and the strain increment at the peak strength, the value range of experience parametersμin this formula is given.关键词
大型直剪试验/粗粒料/剪胀特性/含砾率/剪切速率Key words
large-scale direct shear test/coarse-grained soil/shear dilatancy/gravel content/shearing rate分类
建筑与水利引用本文复制引用
张家铭,胡明鉴,侯国强,张表志,陈拥军..基于大型直剪试验的强风化粗粒料剪胀特性试验研究[J].岩土力学,2013,(z2):67-73,7.基金项目
国家自然科学基金（No.41002104，No.41172283），交通部科技项目 （）
