土石比与土体物理力学参数关系研究

Study on Relation Between the Soil-Stone Ratios and the Physical-Mechanical Parameter of Soil

通过阐述土石比变化对土体干密度、孔隙度、抗剪强度的影响,分析了不同土石比、应力和密实度条件下土石混合物的抗剪强度机理。结果表明:土石混合物的最大干密度由粗细粒的百分比决定,不同成分组成混合物的百分含量界限值接近;土石混合物的孔隙度取决于粗细粒的百分比,混合物的孔隙度低于纯黏粒和纯粗粒的孔隙度;无论样品的压力多大,随着压实度的增大,孔隙度减小,并趋向最小值;土石混合物的抗剪强度参数值不仅与土石比有关,还与其密实度、所受应力有关。

By expounding the effect on dry density,porosity and shear strength of soil while the ratio of soil-stone is difference,this paper analyses shear-strength mechanics of soil-stone-mixture under the condition of different soil-stone ratios,stress and degree of density.The results indicate that the maximum dry density of soil-stone-mixture is determined by the percentage of grain size,and the limiting value of percent contents is in proximity to different constituent mixture;the porosity depends on percentage of coarse-fine grained soil,the porosity of soil-stone-mixture is lower than pure clay-grain and pure coarse-grain;no matter how great the pressure of sample is,porosity decrease and tends to minimal amount;the shear strength parameters of soil-stone-mixture is associated with not only the ratio of soil-stone,but also compactness and the stress.