采矿与安全工程学报2025，Vol.42Issue(2)：252-263,12.DOI:10.13545／j.cnki.jmse.2023.0111
特厚坚硬煤层两柱掩护式超大采高综放液压支架适应性研究
Investigation on adaptability of two-leg shielded LTCC hydraulic supports for ultra-thick and hard coal seam with super-large cutting height
摘要
Abstract
The understanding of the bearing characteristics of two-leg shielded longwall top coal caving(LTCC)hydraulic supports may be insufficient due to inadequate consideration of the roof constraint re-action force.In response to this problem,this study proposed and adopted a modified bearing capacity curve based on the practice of LTCC in extra-thick and hard coal seams in Yushen Mining Area.This curve provides a reasonable explanation for the superior bearing characteristics and adaptability of two-leg shielded LTCC hydraulic supports under such mining conditions.Furthermore,the instability of the hydraulic support's top beam was categorized into load-bearing instability(sliding instability),moment instability(rotational instability),and structural component failure instability.These categories were used for comparative analysis on the bearing characteristics of hydraulic supports with different frame structures.The comparison results indicate that the roof constraint reaction force can effectively improve the stability of hydraulic supports,shifting the mode of instability from moment instability(rotational in-stability)to load-bearing instability(sliding instability)and fully utilizing the rated working resistance of the support's columns.The influence of the roof constraint reaction force on the bearing characteristics of two-leg shielded LTCC hydraulic supports is far greater than that on four-leg chock-shielded LTCC hydraulic supports.Considering the roof constraint reaction force,the ZFY21000/35.5/70D two-leg shielded LTCC hydraulic support with a working resistance of 21 MN displays superior bearing character-istics compared to the ZF26000/36/70D four-leg chock-shielded LTCC hydraulic support with a working resistance of 26 MN.The effectiveness of the roof constraint reaction force depends on the coupling state and stiffness characteristics between the hydraulic support's top beam and the roof(top coal)structure.Hard and intact roof(top coal)conditions are more conducive to fully leveraging the enhancing effect of the roof(top coal)constraint reaction force on the bearing performance of the hydraulic support.关键词
特厚煤层/坚硬煤层/综放开采/超大采高/液压支架/适应性Key words
ultra-thick coal seam/hard coal seam/longwall top coal caving/super-large cutting height/hydraulic support/adaptability分类
矿山工程引用本文复制引用
许永祥,曾明胜,蔡逢华,丁维波,刘俊峰,韩会军..特厚坚硬煤层两柱掩护式超大采高综放液压支架适应性研究[J].采矿与安全工程学报,2025,42(2):252-263,12.基金项目
天地科技开采设计事业部科技创新基金项目(KJ-2021-KCMS-02) （KJ-2021-KCMS-02）
国家重点研发计划项目(2018YFC0604505) （2018YFC0604505）
