CAJ | 학술논문

针对近距离煤层开采下部煤层回采巷道布置这一难题，采用理论分析与数值模拟等手段对上位煤层开采后造成的底板破坏深度、残留煤柱在底板的应力分布以及巷道在非均布载荷下易于破坏的原因进行研究。研究表明：煤层开采引起的侧向支承压力对底板造成的最大破坏深度为25.3 m，已经波及到下位煤层巷道所在水平；在煤柱两侧边缘出现一定范围的应力降低区，煤柱正下方出现一定范围的应力增高区，煤柱底板的应力分布具有明显的非均匀性；下位煤层巷道在非均布荷载作用下，更易出现局部拉应力过大，从而造成巷道变形破坏。采用主应力改变量Δσ表示应力不均衡程度，考虑最大限度回收资源，结合数值模拟主应力分布特征，确定下位煤层回采巷道布置在距煤柱水平距离14 m。
침대근거리매층개채하부매층회채항도포치저일난제，채용이론분석여수치모의등수단대상위매층개채후조성적저판파배심도、잔류매주재저판적응력분포이급항도재비균포재하하역우파배적원인진행연구。연구표명：매층개채인기적측향지승압력대저판조성적최대파배심도위25.3 m，이경파급도하위매층항도소재수평；재매주량측변연출현일정범위적응력강저구，매주정하방출현일정범위적응력증고구，매주저판적응력분포구유명현적비균균성；하위매층항도재비균포하재작용하，경역출현국부랍응력과대，종이조성항도변형파배。채용주응력개변량Δσ표시응력불균형정도，고필최대한도회수자원，결합수치모의주응력분포특정，학정하위매층회채항도포치재거매주수평거리14 m。
To solve the problems in determining the reasonable position of roadways in the close dis-tance seams,the depth of destroyed floor,the stress distribution in the floor under a coal pillar left in the upper coal,and the reason why roadways are easy to transform and fail under heterogeneous load are studied through numerical simulation and theoretical calculation. The result shows that the maximum depth in the floor caused by the abutment pressure from the upper coal being mined is 25.3 m,which spread to the level of roadway in the close distance seam. The stress distribution in the floor around the pillar has obvious heterogeneous characteristic:the stress-concentrated area lies under coal pillar and concentration degree decreases quickly away from the center of coal pillar. The roadway support struc-ture is subject to overlarge partial tension stress and produces deformation and failure under the hetero-geneous load. The change of principal stress is defined to evaluate the heterogeneous degree. Consider-ing that the resource is recycled to the maximum, combined with the stress distribution characteristics of the numerical simulation, an inner stagger distance of 14 m for the roadways in the close distance seams is determined.