CAJ | 학술논문

以菏泽井田赵楼煤矿近千米深埋煤层首采区地质条件为依据,通过离心试验研究采动影响下,煤层顶板不同位置的应力变化规律,结果表明:(1) 开切眼处煤柱处压力随煤层的采动不断变化,对其压力产生明显影响的是前方约35 m煤层的开采,最大应力集中系数为2.04;开挖工作面前方10～15 m煤层支承压力集中,最大应力集中系数为2.8.(2) 直接顶处岩层压力随煤层的采动不断变化,在工作面处达到峰值,最大应力集中系数为1.74,工作面推过后,其压力下降后又有所回升,为上覆岩层重新压实所致.(3) 老顶岩层压力亦随煤层开采不断变化,但其峰值出现在工作面推进后5～10 m,最大应力集中系数高达3.91,在煤层开采过程中,要加强观察和支护,预防冲击地压等灾害的发生.(4) 综合得出赵楼矿井老顶的初次断裂步距约为30 m.试验结果可为煤炭深部开采条件下的岩层控制、合理的巷道布置、改善巷道支护和维护情况及冲击地压的预防提供依据.
이하택정전조루매광근천미심매매층수채구지질조건위의거,통과리심시험연구채동영향하,매층정판불동위치적응력변화규률,결과표명:(1) 개절안처매주처압력수매층적채동불단변화,대기압력산생명현영향적시전방약35 m매층적개채,최대응력집중계수위2.04;개알공작면전방10～15 m매층지승압력집중,최대응력집중계수위2.8.(2) 직접정처암층압력수매층적채동불단변화,재공작면처체도봉치,최대응력집중계수위1.74,공작면추과후,기압력하강후우유소회승,위상복암층중신압실소치.(3) 로정암층압력역수매층개채불단변화,단기봉치출현재공작면추진후5～10 m,최대응력집중계수고체3.91,재매층개채과정중,요가강관찰화지호,예방충격지압등재해적발생.(4) 종합득출조루광정로정적초차단렬보거약위30 m.시험결과가위매탄심부개채조건하적암층공제、합리적항도포치、개선항도지호화유호정황급충격지압적예방제공의거.
Considering the geotechnical conditions of the Zhaolou coal mine,similitude material centrifugal experiment is done,and the stress variation at different positions in coal seam roof is found. The following results have been drawn. (1) Because of the excavation of coal,the pressure variation of coal pillar is evident,the influencing distance is about 35 m,10-15 m ahead the working face;and the maximum pressure concentration coefficient is produced,which reaches 2.8. (2) The pressure of immediate roof reaches its peak value,which is 1.74,immediately when the working face arrives;and it decreases firstly and then rises after the working face passes. (3) The peak value of the pressure of the basic roof occurs after 5-10 m excavation of coal,and the corresponding maximum pressure concentration coefficient reaches 3.91 on the condition of basic roof. Therefore special measures must be carried out. (4) The step of rupture on the basic roof is about 30 m. The research results are important to the design of coal channel,the excavation,and the prevention of geotechnical disaster.