CAJ | 학술논문

针对新义煤矿11011工作面回采巷道煤层松软、围岩变形大、现有微拱工字钢支护难以满足生产安全需要的问题，利用FLAC数值模拟软件分别对微拱工字钢和外扎腿U型钢支护下的巷道位移矢量特征、应力特征及塑性区范围进行了分析．结果表明，外扎腿u型钢支护，能有效地改善围岩的应力状态和控制围岩的变形量，适合该矿软煤层特征；通过对12011皮带运输巷进行的工业性试验的实测变形数据分析表明，外扎腿u型钢支护，降低了顶板与两帮收敛速度与位移，提高了软岩巷道围岩强度和自承能力，维护了巷道围岩的稳定性，支护效果良好，能满足新义煤矿安全生产的要求，可为类似条件下的巷道支护提供参考．
침대신의매광11011공작면회채항도매층송연、위암변형대、현유미공공자강지호난이만족생산안전수요적문제，이용FLAC수치모의연건분별대미공공자강화외찰퇴U형강지호하적항도위이시량특정、응력특정급소성구범위진행료분석．결과표명，외찰퇴u형강지호，능유효지개선위암적응력상태화공제위암적변형량，괄합해광연매층특정；통과대12011피대운수항진행적공업성시험적실측변형수거분석표명，외찰퇴u형강지호，강저료정판여량방수렴속도여위이，제고료연암항도위암강도화자승능력，유호료항도위암적은정성，지호효과량호，능만족신의매광안전생산적요구，가위유사조건하적항도지호제공삼고．
With the gradual increase of coal seam mining depth, the soft characteristic of roadway surrounding rock is more obvious. The difficulty of roadway supporting in a soft coal seam has bedeviled high-efficient op- eration. Because of the soft coal seam and large surrounding rock deformation in 11011 working face mining roadway of Xinyi coal mine, as well as the current I-beam micro-arch support having difficultly to meet the need of safety production, the paper has analyzed and compared I-beam micro-arch support and U steel outer bar leg support with respect to displacement vector charac.teristics, stress characteristics and the plastic zone of the roadway with the application of numerical simulation software FLAC. The result indicates that U steel outer bar leg support improves wall rock stress, and can effectively control the deformation of surrounding rock. Thusly it is more suitable for soft coal seam features. Industrial experiment is conducted in 12011 belt cross- heading, and the measured deformation shows that U steel outer bar leg support reduces the displacement speed and total displacement of the roof and sides, improves the strength of soft rock roadway, self-supporting capacity and maintains the stability of surrounding rock. The support effect is good, satisfies the requirement of safety production in Xinyi coal mine, and could provide a reference for the roadway support with similar conditions.