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中文摘要：
针对大断面沿空掘巷煤柱宽度确定的难题，采用FLAC3D数值模拟方法研究不同宽度煤柱的屈服破坏特征与应力分布规律，研究结果表明：①掘进阶段，煤柱宽度为3 m和4 m时，煤柱全部被压坏，煤柱应力近似呈三角形分布；煤柱宽度超过5 m后，未屈服破坏的煤柱宽度随煤柱宽度增加而呈二次多项式规律增加，煤柱应力近似呈梯形分布。②回采阶段，随着工作面推进，煤柱围岩屈服破坏范围逐渐增加，垂直应力峰值较掘进阶段升高且由梯形分布逐渐向三角形分布演化，超前20 m应加强支护。③工程实践表明，所选受力状态良好、宽5 m的煤柱，回采时采取必要的支护措施可以实现高效安全开采。
英文摘要：
Aiming at the problem that the coal pillar width for large-section roadway driving along next gob was hardlydetermined, study was made on the characteristics of the yield failure and the law of stress distribution of coal pillars in differentwidth by using numerical simulation of FLAC3D. The research results showed：①At the drivage stage, when the coal pillar widthwas 3 m and 4 m, the whole coal pillar was destroyed and its stress was approximately in triangular distribution; when the coalpillar width was more than 5 m, the coal pillar width without yield failure increased in a quadratic polynomial law, and its stresswas approximately in trapezoidal distribution; ②At the wining stage, the yield failure scope of coal pillar＇s surrounding rockgradually increased with the advance of the working face, the peak value of the vertical stress was higher than that at the drivagestage, and the vertical stress gradually evolved from the trapezoidal distribution to the triangular distribution, so support should bestrengthened in 20 m ahead of the coal pillar;③The engineering practice showed that selected coal pillar in 5 m-wide and withgood force condition can realize efficient and safe coal mining when necessary supporting measures were taken in coal winning.
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