矿业科学学报2026，Vol.11Issue(3)：612-625,14.DOI:10.19606/j.cnki.jmst.2025112
排土场混排体级配特性与应力传递机制研究
Gradation and stress transmission mechanism of mixed backfill in the waste dump
摘要
Abstract
The structural stability of waste dumps is critically important to the safety of mine production.Taking the mixed tailings-waste rock dump of a specific mine as the research object,this study system-atically analyzed the particle gradation characteristics and mechanical response laws of the mixed dump based on field investigation and laboratory tests.Through screening and density tests,the particle size distribution and fine particle enrichment characteristics of the mixed dump in different height sections were revealed.Triaxial tests were conducted to obtain the strength parameters of mixed dump with dif-ferent mass ratios,and the influence trend of the dump ratio of mixed dump on cohesion and internal friction angle was clarified.Further combined with PFC discrete element numerical simulation,three types of typical bearing skeleton structures were identified,and a structural identification criterion with volume ratio as the boundary was proposed.The research results show that the skeleton structure of mixed dump can be categorized into three types:single skeleton dominated by waste rock(Type Ⅰ),waste rock-dominated skeleton with tailings participating in stress transmission(Type Ⅱ),and co-bearing skeleton formed by waste rock and tailings(Type Ⅲ).When the volume ratio of waste rock to tailings is in the range of 5.0∶1 to 5.7∶1,the mixed dump transforms from an interstitial structure to a skeleton structure,and its strength parameters increase significantly.Reasonably increasing the waste rock proportion is conducive to the formation of a load-bearing skeleton dominated by waste rock particles,there-by reducing the risk of internal stress concentration in mixed dump.This finding can provide a reference for the structural optimization and safety stability evaluation of mixed dump systems in mine waste dumps.关键词
排土场/尾砂-废石混排体/级配特性/三轴剪切/PFCKey words
waste dump/mixed tailings-waste rock dump/gradation characteristics/triaxial shear/PFC分类
矿业与冶金引用本文复制引用
张小东,凌嘉鸿,陈倩,李欣杨..排土场混排体级配特性与应力传递机制研究[J].矿业科学学报,2026,11(3):612-625,14.基金项目
国家自然科学基金(52374077,52504076) （52374077,52504076）
北京市自然科学基金(8252013) （8252013）
