Study on the Mechanism and Key Influencing Factors of Tailings Filling Body Strength Reinforced by Fiber
In order to study the mechanism of tailings filling body strength reinforced by fiber and the key influencing factors under long-term curing,the effects of fiber content,length and type on reinforcing the strength of tailings filling body under 120 days long-term curing conditions were tested and analyzed by laboratory test and theoretical analysis.The mechanism of tailings filling body strength reinforced by fiber was analyzed by Mohr-Coulomb strength theory.The results show that when the fiber content is low,the tensile force of the near-horizontal fiber segment is the internal cause to enhance the strength of the tailings filling body.With the increase of fiber content,the variation characteristics of uniaxial compressive strength of tailings filling body sample are closely related to the fiber length.When the fiber length is small,the uniaxial compressive strength of the sample increases first and then decreases.When the fiber length is large,the uniaxial compressive strength of the sample decreases first and then increases and then decreases or decreases first and then increases.With the increase of polypropylene fiber length,the uniaxial compressive strength of the sample increases first,then decreases,then increases and then decreases.The fiber type has a significant effect on the uniaxial compressive strength and failure mode of tailings filling body.Compared with polypropylene fiber,glass fiber is more conducive to improving the uniaxial compressive strength of tailings filling body,but it is relatively weak in improving toughness,and the degree and scope of damage are greater.The research results have certain reference value for the filling of fiber tailings paste in underground goaf and the gob-side entry retaining in deep wells.
万方数据
维普
