针对煤矿开采中坚硬顶煤（板）冒落性差的问题，讨论了煤矿生产中由此产生的顶煤放出率、冲击矿压、自燃发火和瓦斯积聚等技术难题；分析了坚硬顶煤（板）水力致裂弱化技术的岩体水力致裂裂缝扩展行 为规律、渗透压力对裂隙岩体宏细观结构的改造作用及其宏观力学响应，水压裂缝扩展形态控制技术，钻孔封 孔技术和岩体水力致裂弱化的监测监控的研究现状和技术发展趋势。

Technologic problems of top coal recovery ratio, rock burst, coal spontaneous combustion and gas accumulation induced by hard top-coal or roof's fall in coal mining were introduced. Current research and development trend of hydraulic fracture weakening for hard top-coal or roof was analyzed, including the law of crack expanding induced by hydraulic fracture in rock mass, mescoscopic structure alteration of cracked rock mass by seepage pressure and its macroscopic mechanics response, controlling technology of hydraulic crack's expanding, the technology of enveloping drillbore and weakening effect monitoring.