基于抛物线型强度准则的巷道煤柱塑性区宽度确定

发布时间：2018-12-06 19:32

【摘要】：巷道煤柱塑性区宽度的合理留设是采掘工作的重点,亦为采煤设计提供重要参数。为确定该值,以极限平衡理论为基础,选用抛物线型作为煤岩体破坏强度准则,建立了塑性区极限平衡力学模型,同时以煤岩体达到塑性流变强度作为应力求解的条件,推导得出了煤岩抗拉压强度、煤柱高度、侧向压力系数等条件下的塑性区宽度解析解,讨论分析了塑性区宽度影响因素。结果表明:煤岩体强度、拉压比、侧向压力系数对塑性区极限宽高比影响显著。现场塑性区超声探测结果与理论计算值相吻合,这说明煤柱塑性区模型构建科学合理,为类似煤柱宽度合理留设提供了参考依据。
[Abstract]:The reasonable setting of plastic zone width of roadway pillar is the key point of mining work, and it also provides important parameters for coal mining design. In order to determine this value, based on the limit equilibrium theory, the parabola is chosen as the failure strength criterion of coal and rock mass, and the limit equilibrium mechanical model of plastic zone is established. At the same time, the plastic rheological strength of coal and rock mass is taken as the stress solution condition. The analytical solutions of the width of plastic zone under the conditions of tensile compression strength of coal and rock, height of coal pillar and lateral pressure coefficient are derived, and the factors affecting the width of plastic zone are discussed and analyzed. The results show that the strength of coal and rock mass, the ratio of tension to compression, and the coefficient of lateral pressure have significant effects on the limit ratio of width to height of plastic zone. The results of ultrasonic detection in situ plastic zone are in agreement with the theoretical calculation value, which indicates that the model of plastic zone of coal pillar is scientific and reasonable, and provides a reference for the reasonable setting of the width of similar coal pillar.
【作者单位】：中煤科工集团西安研究院有限公司水文地质研究所;西安科技大学地质与环境工程学院;
【基金】：国家自然科学基金青年科学基金项目(41402265) 陕西省自然科学基础研究项目(2014JM2-5064) 中煤科工集团有限公司面上项目(2014MS002)
【分类号】：TD822.3

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