CAJ | 학술논문

以某矿1007工作面直接顶缺失上覆硬厚砂岩岩层条件为工程背景，建立了硬厚岩层两临边固支一边简支一边自由薄板力学模型，研究了薄板应力分布特征，得到了直接顶缺失一侧采空硬厚岩层破断步距计算公式。薄板拉应力最大点在倾向固支边(x=0，y=13b/10π)处和走向固支边与自由边交角点(x=a，y=b)处，实际应力最大点位置受覆岩悬跨系数k影响。对双层硬厚砂岩岩层实施下位硬厚岩层旋转扇形深孔预裂弱化和上位硬厚岩层拉槽截断深孔爆破综合弱化技术，上位硬厚岩层运动步距降低25.7%，下位硬厚岩层实现由基本顶向直接顶的转化，降低了工作面因大面积悬露顶板突然运动引燃隅角积聚瓦斯的风险。
이모광1007공작면직접정결실상복경후사암암층조건위공정배경，건립료경후암층량림변고지일변간지일변자유박판역학모형，연구료박판응력분포특정，득도료직접정결실일측채공경후암층파단보거계산공식。박판랍응력최대점재경향고지변(x=0，y=13b/10π)처화주향고지변여자유변교각점(x=a，y=b)처，실제응력최대점위치수복암현과계수k영향。대쌍층경후사암암층실시하위경후암층선전선형심공예렬약화화상위경후암층랍조절단심공폭파종합약화기술，상위경후암층운동보거강저25.7%，하위경후암층실현유기본정향직접정적전화，강저료공작면인대면적현로정판돌연운동인연우각적취와사적풍험。
In view of the conditions of double hard-thick sandstone strata without immediate roof above coal seam in Working Face 1007 of one mine, an elastic thin plate model with two adjacent clamper edges, one simply supported edge, and one free edge was established as the mechanical model of hard thick strata. Stress distribution within the thin plate was then studied, and fracture step calcula-tion formula of hard thick strata was obtained. The results show that the maximum point of tensile stress is located at (x=0,y=13b/10π) of the inclination clamper edge and the intersection of strike direction clamper edge and free edge where (x=a,y=b), while the actual position of maximum stress is affected by strata spanning modulus k. The pre-split weaken technology was carried out for the double hard-thick sandstone strata, that is, the lower hard thick stratum was weakened by fan-shaped rotation deep pre-split holes, and the upper hard thick stratum was weakened by ultramultiple-hole longhole blasting, which makes the movement step of the upper hard thick stratum decrease 25.7%, and the lower hard thick stratum changes from main roof to immediate roof. Thus, the accumulated gas ignition risk at the work face corner duo to the suddenly movement of large area hanging strata has been reduced.