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为了揭示双巷布置工作面留巷塑性区演化特征,以石圪台矿为研究背景,应用理论分析和数值模拟方法,针对主应力大小、角度和塑性区分布特征展开研究,获取了留巷主应力变化规律、塑性区扩展特征,阐明了留巷发生非对称变形的原因。结果表明:1)得出了留巷轴向主应力分布特征,并沿走向将其划分为7个阶段,主应力特征曲线左右大致对称,中部高且平缓、左右两侧较低但变化幅度大,其中主应力大小及角度急剧变化过程位于滞后影响阶段;2)主应力大小与塑性区扩展范围正相关,主应力角度决定了塑性区扩展方位,二者共同作用下塑性区产生非对称扩展,从而引起留巷围岩非对称变形;3)得出了石圪台矿31203工作面留巷非对称变形破坏特征,确定了隐患部位,提出了留巷非对称补强支护方案,现场应用取得良好效果。
In order to reveal the evolvement characteristics of plastic zone in laneway with double lane layout, taking Shitailai mine as a research background, aiming at the characteristics of principal stress size, angle and plastic zone distribution, theoretical analysis and numerical simulation methods were used to study the characteristics of plasticizer. Stress variation and plastic zone expansion characteristics, clarify the cause of asymmetric deformation of retaining lane. The results show that: 1) The axial principal stress distribution characteristics of the retaining lane are obtained and divided into seven stages along the strike direction. The main stress characteristic curve is roughly symmetrical about left and right, high and gentle on the middle, low on the left and right but with large variation , In which the process of the main stress and the rapid change of the angle lie in the phase of hysteresis; 2) the principal stress is positively related to the extension of the plastic zone, and the principal stress angle determines the extension of the plastic zone. As a result, the plastic zone expands asymmetrically, Resulting in the asymmetric deformation of the surrounding rock; 3) The unsymmetrical deformation and failure characteristics of 31203 retaining face in Shitantai Mine have been identified, the hidden parts have been identified, and the asymmetrical reinforcing support scheme for retaining lane has been proposed. Good effect.