综采工作面支架与围岩双周期动态作用机理研究

发布时间：2018-05-15 18:39

本文选题：支架工作阻力 + 双周期动态作用　；参考：《煤炭学报》2017年12期

【摘要】：为揭示液压支架与围岩的动态作用机理,将工作面开采过程分为若干个顶板活动周期,将每一个顶板活动周期分为若干个采煤循环周期,在研究支架载荷变化特征的基础上,综合"砌体梁"理论、弹性基础梁理论以及牛顿第二定律,提出了支架与围岩在双周期内的动态作用模型。在顶板活动周期内,研究认为"砌体梁"结构中的关键块A触矸是判断循环末阻力变化趋势的关键节点,关键块A触矸前循环末阻力逐渐增加,触矸后逐渐减小。在采煤循环周期内,研究认为"砌体梁"结构主要由煤壁、液压支架和采空区矸石组成的不同弹性模量支撑体共同承担,根据增阻特征的不同,将采煤循环内支架与围岩的作用过程分为给定变形和给定载荷两个阶段研究,提出了液压支架动态增阻函数,认为在给定变形阶段液压支架时间序列曲线符合对数函数,在给定载荷阶段符合指数函数。通过寺河矿及新元矿综采工作面实测数据分析,认为现场实测与理论分析结果一致。以上研究成果可为顶板灾害预测预报及顶板岩层控制实践提供参考。
[Abstract]:In order to reveal the dynamic action mechanism of hydraulic support and surrounding rock, the mining process of working face is divided into several roof active cycles, and each roof active cycle is divided into several mining cycles. Based on the theory of "masonry beam", the theory of elastic foundation beam and Newton's second law, the dynamic action model of support and surrounding rock in double period is put forward. In the roof movement cycle, it is considered that the key block A in the masonry beam structure is the key node to judge the change trend of the resistance at the end of the cycle. The end resistance of the key block A increases gradually before and after the gangue contact, and decreases gradually after the touch of the gangue. During the cycle of coal mining, it is considered that the structure of masonry beam is mainly composed of different elastic modulus supports composed of coal wall, hydraulic support and gangue in goaf. The interaction process between support and surrounding rock in coal mining cycle is divided into two stages: given deformation and given load. The dynamic resistance increasing function of hydraulic support is proposed. It is considered that the time series curve of hydraulic support accords with logarithmic function at given deformation stage. The exponential function is fitted at the given loading stage. Through the analysis of the measured data of the fully mechanized mining face in Sihe Mine and Xinyuan Coal Mine, it is considered that the field measurement results are consistent with the theoretical analysis results. The above research results can provide reference for roof disaster prediction and roof strata control practice.
【作者单位】：煤炭科学研究总院开采研究分院;天地科技股份有限公司开采设计事业部;
【基金】：国家重点研发计划资助项目(2017YFC0603000,2017YFC0804300) 国家自然科学基金青年基金资助项目(51604152)
【分类号】：TD355.4

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