CAJ | 학술논문

针对水平分段开采造成的持续性扰动作用运用数值模拟的方法进行分析,揭示本分段开采后和下分层开采后模型整体的塑性区、应力场和位移场分布特征,并重点分析了下分段巷道的围岩应力分布特点,最后通过现场监测分析掌握了实际开采过程中开采扰动的影响特点.结果表明:急倾斜水平分段工作面中,随着分段高度的加大上分段开采对下分段的影响逐渐减弱,下分段较大厚度的煤体起到了缓冲作用;下分段底板侧+518 m水平巷道(B3巷)岩石侧承受的压力较大,顶板侧即+518 m水平B6巷道岩石侧承受的压力较大,上分段开采对下分段的超前影响距离是10~20 m,下分段巷道受到开采扰动和采空区覆层介质垮落的影响,锚杆拉力变化滞后于工作面.
침대수평분단개채조성적지속성우동작용운용수치모의적방법진행분석,게시본분단개채후화하분층개채후모형정체적소성구、응력장화위이장분포특정,병중점분석료하분단항도적위암응력분포특점,최후통과현장감측분석장악료실제개채과정중개채우동적영향특점.결과표명:급경사수평분단공작면중,수착분단고도적가대상분단개채대하분단적영향축점감약,하분단교대후도적매체기도료완충작용;하분단저판측+518 m수평항도(B3항)암석측승수적압력교대,정판측즉+518 m수평B6항도암석측승수적압력교대,상분단개채대하분단적초전영향거리시10~20 m,하분단항도수도개채우동화채공구복층개질과락적영향,묘간랍력변화체후우공작면.
In view of the persistent mining disturbance from horizontal section top-coal caving, nu-merical simulation was used to study the distribution characteristics of plastic district, stress field and displacement field at the stages of mining current and next sublevels, and the surrounding rock stress distributions at next sublevel entries were intensively discussed. Meanwhile, the effect characteristics of mining disturbance were monitored and analyzed in field test. The results show that the disturbance ef-fect of upper sublevel to next sublevel is weakened gradually with the increase of horizontal section height, and the larger thickness coal mass can play a cushion influence. In the next sublevel, the floor side stress in B3 roadway at +518 m level is larger, while the roof side stress in B6 roadway at +518 m level is larger. The advanced distance of mining disturbance affected by the upper sublevel is 10~20 m. Influenced by both the mining disturbance and caving effect of gob strata, the bolt tension variation in the entries of next sublevel is lagging behind the working face.