【摘要】 通过在 DRS-1型微机高压直残剪试验系统上所进行的建筑砂、标准砂、粉土和粘土与混凝土、金属光滑、金属粗糙界面的正交直接剪切试验研究表明 :高应力作用下剪切带内的土体体积呈现剪缩现象 ,这与低应力下密实土体所表现的剪涨特征是不同的。根据对试验数据的直观分析 ,最终体积应变各因素的影响顺序为法向应力 >土性 >剪切速率 >界面 ,体积应变 -剪切位移曲线起始切线斜率的影响顺序为土性 >界面 >法向应力 >剪切速率 ;影响程度的大小主要取决于剪切带内土体的颗粒破碎、变形调整空间以及基底的变形量。更多还原

【Abstract】 The orthogonal direct shearing experiments about building sand,standard sand, silt and clay on concrete interface, smooth and rough interface of the metals, using DSR 1 type computer high pressure shear system, has been conducted in the paper, the result shows: the volume of soil mass in shear zone presents contractive phenomenon under high pressure, which is different from the dilatancy of soil mass under low pressure. According to the visual analysis of test data, the sequence of the factors affecting the final volumetric strain is respectively as followings: normal stress, soil property, shearing rate and interface; and yet the sequence of the factors affecting original tangential slope of volumetric strain shearing displacement curve is respectively soil property, interface, normal stress and shearing rate. The influencing degree depends on the particle breakage of soil mass cut zone, deformational adjustment range and the deformational capacity of base.更多还原