循环荷载下不同岩性散体压实与再破碎特征

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中图分类号：X936 文献标志码：A 文章编号：1000-582X（2025）12-060-13

doi：10.11835/j.issn.1000.582X.2025.12.006

Abstract： To investigate the compaction and re-crushing characteristics of fractured rock under multiple mining. This study conducted cyclic loading and unloading mechanical tests on aggregates of different lithologies.The variation paterns of mechanical parameters of granules were systematically investigated.The granules energy evolution characteristicsand fractal dimension were clarified.Theresearch findings indicate that low-strength mudstone granules exhibitthe greatest strainunder identical loading conditions，requiring relatively low cumulative energy during compaction.Meanwhile，mudstone shows the highest fractal dimension，indicating the greatestdegreeofcrushing.During the initial loading stage，thegranules porosity rapidly decreases，the compressive modulus rises，and the granules is rapidly compacted. When stress exceeds a certain threshold，the compressive modulus continues to decrease，energy density increases significantly，and the granules undergo extensive fracture. The research findings provide significant support for elucidating the compaction and re-crushing mechanisms of granules in caving zones under multiple mining.

Keywords： multiple mining; compaction and re-crushing; energy evolution; particle size distribution

中国煤层群广泛赋存，多重采动普遍存在5]。（剩余13328字）