Shandong Xinjulong Energy Co., Ltd.

针对江苏徐州大屯煤矿含非均质顶板破坏造成矿井事故问题,基于离散元数值模拟方法,在PBM基础上建立了含随机分布非均质结构的砂岩试样,研究了均质性改变对砂岩强度及破坏特征的影响。结果表明:含弱质非均质颗粒的砂岩试样在起裂应力、峰值应力及弹性模量方面均小于标准砂岩试样,含硬质非均质颗粒砂岩试样的起裂应力、峰值应力及弹性模量根据非均质颗粒含量不同呈现不同变化规律;非均质颗粒属性与砂岩颗粒相差越大,试样起裂应力、峰值应力及弹性模量离散性也越大。

Aiming at the problem of mine accidents caused by the failure of heterogeneous roof in Datun Coal Mine in Xuzhou, Jiangsu Province, based on discrete element numerical simulation method, a sandstone sample with randomly distributed heterogeneous structure is established on the basis of PBM. The influence of homogeneity changes on the strength and failure characteristics of sandstone is studied. The results show that sandstone samples containing weak heterogeneous particles have lower crack initiation stress, peak value stress, and elastic modulus than standard sandstone samples. The crack initiation stress, peak value stress, and elastic modulus of sandstone samples containing hard heterogeneous particles show different variation laws according to different content of heterogeneous particles; The greater the difference in properties between heterogeneous particles and sandstone particles, the greater the discreteness of the sample's crack initiation stress, peak value stress, and elastic modulus.