彬长矿区是典型的综放高强度开采矿区，矿井生产长期面临顶板巨厚洛河组砂岩涌水影响与威胁，减水（减少涌水量）开采是矿区实现可持续发展的重大课题之一。基于巨厚砂岩含水层水文地质条件的精细探查,总结了巨厚含水层具备垂向非均质的总体特征，指出了该特征是彬长矿区减水开采的水文地质基础。根据区域覆岩导水裂隙带发育高度探查成果的分析，总结了矿区综放覆岩破坏总体规律。通过对矿区含水层厚度、富水性及覆岩厚度等涌水量主控因素的分析，建立了矿区受顶板水影响指数P评价模型，将顶板含水层对开采影响划分为弱影响、中等影响、强影响等3个等级，并给出了影响分区划分指标表；首次提出含水层“楔入比”的概念，并分析了其基本原理及适用条件，并针对不同影响程度分区的开采水文地质条件，建立了采高控制型、限高-限宽型、隔离-注浆型等3种减水模式。矿区典型矿井开展了综放减水开采的工程实践，实现了弱影响区采后含水层水位恢复，中等影响区采后涌水量小幅增长（基本控制在100 m³/h以内），强影响区注浆隔离减水的绿色开采目标，取得了较好的应用效果。

Binchang Mining Area is a typical intensive full-mechanized top-coal caving mining area.However,mine production is faced with the influence and threat of water inflow from Luohe formation ultra-thick sandstone of coal roof,for a long time.Therefore,water-reducing mining is the main problem in the sustainable development of mining area.This paper summarized general characteristics of vertical heterogeneity of ultra-thick aquifer,based on hydrogeological condition fine expedition of ultra-thick sandstone aquifer.And these characteristics were regarded as water-reducing basic hydrogeology of Binchang mining area.In addition,overburden failure general law of fully-mechanized top-coal caving mining area was summarized according to exploration results of water-conducting fracture zone height.Then,we analyzed the main controlling factors of water inflow including aquifer thickness,water yield property and overburden rock thickness.And a P evaluation model,mining area affected by roof water index,was established.Based on this model,influence of roof aquifer on mining was divided into three grades including weak influence zone,medium influence zone and strong influence zone,and influence partition indexes were provided.Besides,we first proposed the concept of wedging ratio,and analyzed its basic theory and application condition.And three water-reduction patterns including water reduction control,height-width limit,isolation-grouting modes were established according to the influence degree dividing zones.Using this technology,typical coal mines all conduct fully-mechanized top-coal caving water-reducing mining,and this technology makes aquifer level recover in weak influence zone,increase of water inflow decrease in medium influence zone after mining(basically within 100 m2/h),water inflow decrease after grouting and insulating.On the whole,the practical application results are satisfactory.