推进方式对断层围岩应力演化规律的影响

发布时间：2018-04-30 01:07

本文选题：冲击地压 + 断层　；参考：《采矿与安全工程学报》2017年02期

【摘要】：煤炭开采中的冲击地压与断层构造密切相关,而工作面分别沿断层上盘和下盘推进时具有不同的冲击危险。为研究工作面推进方式与断层活动的相关性,以某过正断层工作面为例,通过数值计算分析不同推进方式下断层两盘接触应力状态的演化过程,基于对推进过程关键层破断规律的分析,研究断层应力演化差异性产生的原因,并通过工作面实际回采过程的微震监测数据,验证了采动影响下断层活化规律。研究发现:上盘开采时的断层应力变化幅度大于下盘开采时的应力变化幅度,上盘开采时断层围岩系统应力传递能力优于下盘开采;推进方式会影响上覆岩层破断后的覆岩结构和应力传递,上盘开采时关键层破断后更易形成砌体梁结构,且结构体系的稳定性高于下盘开采,下盘开采时工作面冲击危险性更高,须根据断层性质做好工作面布置和开采优化,进而降低冲击地压危险。
[Abstract]:The percussive ground pressure in coal mining is closely related to the fault structure, and there are different impact hazards when the face is pushed along the upper and lower face of the fault respectively. In order to study the correlation between the driving mode of the working face and the fault activity, the evolution process of the contact stress state of the two plates of the fault under different propelling modes is analyzed by numerical calculation with a certain normal fault face as an example. Based on the analysis of fracture rules of key strata during the propulsion process, the causes of the difference of fault stress evolution are studied, and the law of fault activation under the influence of mining movement is verified by the microseismic monitoring data of the actual mining process. It is found that the variation range of fault stress in the upper face mining is larger than that in the lower face mining, and the stress transfer capacity of the fault surrounding rock system in the upper face mining is better than that in the lower face mining. The propelling mode will affect the overburden structure and stress transfer after the overlying strata break, and the masonry beam structure will be formed more easily after the key strata break in the upper face mining, and the stability of the structure system is higher than that of the downboard mining. The working face impact risk is higher when mining in the footwall, so the working face layout and mining optimization should be done according to the fault character, and then the risk of rock burst should be reduced.
【作者单位】：北京科技大学土木与资源工程学院;中国矿业大学煤炭资源与安全开采国家重点实验室;
【基金】：国家重点研发计划项目(2016YFC0801403) 国家自然科学基金项目(51504015) 中国矿业大学煤炭资源与安全开采国家重点实验室开放基金项目(SKLCRSM15KFB02) 中央高校基本科研业务费项目(FRF-TP-15-054A1)
【分类号】：TD322

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