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我国是世界上煤炭储量较多的国家之一,也是煤层赋存条件十分复杂的国家。我国煤层厚度大于3.5米的占43.17％;倾角小于15°的占80.38％;顶板破碎的占50％左右。三十年来,我国开采缓倾斜厚煤层,除顶板极坚硬外,多用倾斜分层走向长壁下行垮落采煤法。对于该法,虽经不断改进、完善,不但在第一分层(以下简称上分层),而且在第二、第三、……分层(以下简称下分层)实现了一般机械化采煤,也实现了综合机械化采煤,可是,至今下分层采面所用单体支架都是延用适于上分层采面的支架,从未依据下分层采面矿压特点单独为其设计过支架。至于液压自移支架更是如此,先是延用适于上分层
China is one of the countries with more coal reserves in the world and is also a country with complicated coal seam conditions. China’s coal seam thickness of more than 3.5 meters accounted for 43.17%; dip less than 15 ° accounted for 80.38%; roof crushed accounted for about 50%. In the past 30 years, the mining of gently inclined thick coal seam in our country has been mostly inclined and stratified toward the longwall descending coal mining except the extremely hard roof. Although this method has been continuously improved and perfected, not only the first stratification (hereinafter referred to as stratification) but also the second, third, ... stratification (hereinafter referred to as stratification) have realized the general mechanization of coal mining , But also to achieve a comprehensive mechanized mining, but so far the single stratified mining planes are used to extend the single-sided support for stratified mining face, never based on stratified mining face underground pressure characteristics of its separate design Over the stent. As for the hydraulic self-moving stent is even more so, first extension is suitable for the upper stratification