高水压巨厚砂砾层裂隙岩体下控水采煤技术

Water Controlled Coal Mining Technology Under Cracking Strata of Super Thick Gravel Layer with High Pressurized Water

以宿州煤田的祁东煤矿地质采矿条件为例,阐述了原生纵向裂隙发育覆岩及高水压巨厚含水砂砾层作用条件的特征和控水采煤技术的原理;采用控水采煤技术,通过调整和控制采动影响引起的张裂性破坏区的发育程度及其渗透性变化来控制采煤工作面涌水量大小及其有无涌水,同时还考虑到了未受到采动破坏性影响的保护层的渗透性因素,并结合高水压水体对于裂隙岩体条件下的导水裂缝带高度和保护层厚度的作用和影响,通过完善的控水采煤安全措施的实施,实现了7.14、7.12两综采工作面有限程度砂砾层涌水和无砂砾层涌水形式下的安全生产。

Taking the geological mining conditions of the Qidong Mine in Suzhou Coalfield as an example, the paper stated the features of the original longitudinal fissure developed overburden strata under the high pressurized super thick water bearing gravel layer and the principle of the water controlled mining technology. With the water controlled mining technology, through the adjustment and control of the development degree of the tensile cracking failure zone occurred by the mining and through the variation of the permeability to control the water inrush quantity and no water inrush of the coal mining face, in consideration of the protected layer permeability factor no affected mining failure, in combined with the high water pressurized water body to the function and influences of the water conducted fissure zone height and the protected layer thickness under the fissure rock mass, with implementation of the improved water controlled coal mining safety measures, No. 7114 and No. 7112 fully mechanized coal mining faces had a safety production with limited water inrush from the gravel layer and no water inrush from gravel layer.