模拟堆石料颗粒破碎对强度变形的影响

许多试验事实表明，极高压力下颗粒材料粒径极限分布并非 Hardin 所谓的以 0.074 mm 为截断粒径的均匀分布。通过拓展破碎概念提出了 Hardin 破碎指标修正定义，并用以区分剪切过程中破碎的暂时和永久终止状态。 开展了系列模拟 堆石料固结排水大型三轴试验，提出了系列非线性关系用以描述模拟堆石料的级配、破碎指标以及应力–应变–体变响应变化规律。分析表明：随着围压增加，特征粒径减小而级配指标增加，试样级配变化明显；随着围压增加，峰值（或临界）状态破碎指标增加，相应的应力比和内摩擦角则减小，两种状态下破碎指标与内摩擦角具有唯一对应关系；同一剪切过程中，破碎指标变化率、剪胀率和塑性剪切模量具有非同步变化关系，由此形成了颗粒破碎对于模拟堆石料应力变形影响的复杂性。

Effect of particle breakage on strength and deformation of modeled rockfills

Much experimental evidence suggests that for granular materials,the ultimate grain size distribution is not an arbitrary cut-off value of particle size(of 0.074 mm) proposed by Hardin in 1985 under extremely large confining pressure.A modified definition of Hardin's breakage index is presented for crushable granular materials to characterize two processes of temporary or perpetual termination of breakage by further developing the concept of breakage.A series of consolidated drained large-scale triaxial test...