尾矿土物理力学性质指标的相互关系

The Relationship of Physical and Mechanical Properties for Tailings Soil

目的正确有效地确定尾矿土的抗剪强度,以保证尾矿库工程的稳定性.方法通过现场取样,然后在试验室进行土的物理及力学指标试验,研究尾粉砂、尾粉土、尾粉质黏土的含水率与孔隙比之间的关系以及含水率、孔隙比、干密度与抗剪强度指标之间的关系.结果随着含水率的增大,尾粉砂的孔隙比减小,尾粉土与尾粉质黏土的孔隙比增大;尾粉砂、尾粉土和尾粉质黏土的含水率与抗剪强度指标呈非线性关系;孔隙比、干密度与抗剪强度指标呈线性关系:随着孔隙比的增大,黏聚力与内摩擦角减小;随着干密度的增大,黏聚力与内摩擦角均增大.结论尾粉砂、尾粉土、尾粉质黏土的物理指标与抗剪强度指标之间存在相关性,在明确物理指标的情况下可以推断出相应的抗剪强度指标范围.

The purpose of this paper is to correctly determining the shear strength of tailings soil effectively, to ensure the stability of the tailings project. Through field sampling, and then the physical and mechanical indexes of soil test in laboratory, study the relationship between the moisture content and void ratio. And the relationship between moisture content, void ratio, dry density and the shear strength indexes of tail silt, tail floury soil and tail silty clay. We can know that with the increase of moisture content, the tail silt＇s void ratio decrease ,the tail floury soil and silty clay＇s void ratio increase. Three kinds of tailing soil＇s moisture content and shear strength index express as a nonlinear relationship. The void ratio and dry density show as linear re- lationship with shear strength index. With the increase of void ratio, cohesion and internal friction Angle de- crease. With the increase of dry density, cohesion and internal friction Angle increase. The results of this a- nalysis can be used for tailings soil research and provided a reference for practical engineering.