不同掺土量加筋煤矸石的界面摩擦试验研究

为了获得不同掺土量加筋煤矸石界面摩擦特性,以镀锌覆塑格宾网为筋材,以不同掺土量煤矸石为填料,按最优含水率配制试料,控制94%的压实度制样,进行了大型直剪试验.试验结果表明:加筋煤矸石在界面摩擦区剪应力与剪切位移的关系为非线性的,界面摩擦区的抗剪强度随法向应力增大而增加.掺土量在20%以内的加筋煤矸石,界面摩擦强度参数随掺土量的增加呈现有规律性的变化,界面黏聚力随掺土量的增加先减小后增加,界面内摩擦角随掺土量的增加先增加后减小.加筋煤矸石的强度参数公式用摩尔库伦理论拟合是合适的,其参数公式不仅能反映煤矸石颗粒之间以及煤矸石与筋材之间的黏聚力,而且能获得较好的相关系数.

Experimental Study of the Interface Friction Characteristics between Coal Gangue and Reinforcement with Different Qualities of Soil

In order to obtain the interface friction characteristics between reinforcement and coal gangue mixed with different qualities of soli, large-shear tests were carried out. The test used gabion mesh galvanized and covered with plastics. The filler was coal gangue mixed with different qualities of soil and prepared with the optimum moisture content. The samples controlled the compaction of 94%. The results showed that the relationship between shear stress and displacement on the interface friction and coal gangue and reinforcement was nonlinear, and the shear stress on the interface friction increased with the increase of normal stress.The parameters of the interface friction strength changed regularly with the increase in the amount of soil when the mixed soil was less than 20%. When the mixed soil increased, the interface cohesion decreased first and then increased, but the interface friction angle first increased and then decreased. The strength parameters of the coal gangue mixed with reinforcement conformed to the theoretical formual Mohr. The formula not only reflects the cohension between coal gangue and reinforcement, but also has a better correlation coefficient.