粗粒料颗粒破碎模型研究

结合三轴试验资料,对粗粒料在不同围压和应力水平下颗粒破碎进行了研究,结果表明,相对颗粒破碎率与围压的关系可以用反双曲函数拟合；一定围压下,相对颗粒破碎率随应力水平的增长呈非线性的指数关系.在试验分析基础上,借鉴湿化变形理论,认为处于某一应力状态下的粗粒料的破碎分别由球应力和偏应力两部分引起,偏应力部分从应力水平的角度加以研究,建立了适合于粗粒料颗粒破碎率的计算模型.探讨了粗粒料颗粒破碎模型参数与围压以及应力水平的关系,建议了相对破碎率计算经验公式,并结合有关试验结果拟合出了粗粒料的颗粒破碎模型参数.对比分析表明,拟合结果与试验成果吻合较好,说明了该模型的合理性.

Study on Particle Breakage Model of Coarse Aggregate

Combined with the results of triaxial test,particle breakage of coarse aggregate under different confining pressure and stress level is studied.The research result shows that inverse hyperbolic function is used to fitting the relation between relative percentages of particle breakage and confining pressure and relative percentage of particle breakage shows exponential growth with stress level under certain confining pressure.On the basis of tests,and slaking deformation theory for reference,the particle breakage is mainly caused by spherical stress and deviatoric stress under certain stress state and deviation stress is studied from the view of stress level.The calculation model which fits for percentage of particle breakage is built up.Also,the empirical formula is determined through the relation between particle breakage model parameters and stress level.The comparison suggests that the fitting results achieve reasonable agreement with the experimental results.