中文摘要：

为保证大同矿区特厚煤层开采过程中临空巷道超前支护段的稳定性与可用性，采用理论分析与现场实测相结合的方法，得到巷道超前支护段的强矿压显现机制。研究表明：侏罗系煤层采空区区段煤柱应力集中影响区深度仅50～70 m，不足以影响石炭系工作面回采巷道的强矿压显现；石炭系工作面临空巷超前支护段的强矿压显现，主要受工作面采动超前支承压力及相邻工作面采空区悬顶的双向高支承压力的影响，且当工作面过上覆煤层采空区边界煤柱后，侏罗系煤层顶板大结构被重新激活，再次运动失稳，加剧了临空巷道的强矿压显现。提出并实施巷道顶板水压致裂有效控制技术，对同忻矿8105工作面5105临空巷实施定向高压水力致裂，实现巷道围岩高应力的转移，大大降低了临空巷超前支护段的强矿压显现强度，取得良好的临空巷卸压效果，保证了特厚煤层综放工作面的正常生产。

英文摘要：

To ensure the stability and working of the advance supported roadway on gob side at the extra-thick seam zone during the mining process in Datong mine,a combined method of theoretical analysis and field measurement was used to obtain the pressure behavior of the forepoling segment of the roadway. The results of the research showed that the depths affected by the stress concentration zone of the coal pillar at mined-out section of Jurassic period were only 50-70 m,not deep enough to affect the occurrence of the strata pressure at the working face of the advance supported roadway in Carboniferous period. The occurrence of the strong strata pressure at the advance supported roadway in Carboniferous period was mainly affected by the abutment pressure due to mining and the high bearing pressure of overhang roof on two sides of the adjacent mined-out area. When the working front passed the boundary pillar of the mined-out area of the overlying coal,the big seam roof structure in Jurassic period was reactivated and tended to be unstable again,which speeded up the occurrence of the strong strata pressure of the roadway approaching the mined-out area. An effective control technology with the orientated high-pressure hydraulic fracturing of roadway roof was proposed and applied to the working front 8105 in the roadway 5105 approaching the mined-out area in Tongxin mine. The technology achieved the high stress transfer in the surrounding rock of roadway and greatly reduced the strong strata pressure of advance supported roadway approaching mined-out area.