基于实测数据的非坚硬顶板综采工作面大面积来压原因分析

Cause Analysis of Large-area Weighting of Full-mechanized Mining Face under Non-hard Roof Based on Actual Measurement Data

综采工作面由于受地质条件、回采工艺、支护强度的影响,有时会发生大面积来压和突然垮落现象,造成人员伤亡。理论和实测分析表明,不仅坚硬顶板会发生大面积顶板来压灾害,相对顶板较软的长壁工作面也会发生大面积顶板灾害,只是两者灾害发生的位置、破坏形式有所不同。以支架工作阻力实测数据为依据,对非坚硬顶板发生的大面积来压原因进行了分析。分析结果表明:支架初撑力、工作面推进速度、支撑效率为工作面压架重要影响因素,并通过分析支架安全阀开启率实现压架的预警。

Influenced by geological condition, mining technique and supporting density, large-area weighting and sudden caving, even personal casualties would occurred in full-mechanized mining face. Theoretical and practice showed that for long-wall mining face, not only hard roof, but also non-hard roof condition could form large-area roof disaster, their difference only lied in disaster location and form. Taking the observed working resistance data of powered support as base, cause of large-area weighing under non-hard roof condi- tion was analyzed. Results showed that setting load of powered support, mining speed and supporting efficiency were main influence fac- tors of support crushing. Support crushing alert was realized by analyzing safety-valve start-up ratio.