Starobin钾盐矿床第三层无片柱提矿岩压表现特征

A. Petrovsky, V. Y. Prushak, E. Lutovich
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引用次数: 0

摘要

研究了Starobin钾盐矿床第三层无片柱开采时下部长壁开发工作面及井底区域的岩石压力表现。研究了长壁开发工作面和井底空间的稳定性以及井底衬与围岩的相互作用性质。评价了长壁围岩压力表现强度、井底区顶板沉陷性质及其落在工作面支护后的情况。阐明了井底衬在处理周期内加载速度分布的性质。以掘进前和掘进过程中的载荷变化率以及井底衬的载荷速率作为处理周期的主要载荷支撑指标。揭示了这些指标在10-12个治疗周期间隔内幅度变化的周期性。揭示了它们对新工作面形成后顶板的弹性应力和蠕变的依赖性。建立了由于井底运动速度的影响,井底衬载荷存在动力分量的理论。建立了位移槽内岩石变形对井底衬的影响。同时表明,在2年以上的时间间隔内,岩石的变形强度明显减小。通过对荷载支撑指标均值累积偏差的动态分析,揭示了确定主顶板次生岩石沉降平均间距以及识别构造位错、断层和沉降槽边界异常的可能性。对第三钾层无柱分层开采时维持井底区域和下长壁开发作业的合理、安全参数提出了建议。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Features of rock pressure manifestations with the slice pillarless extraction of the Third potash layer at the Starobin potash salt deposit
Rock pressure manifestations in the development workings and the bottomhole region of the lower longwalls with the slice pillarless extraction of the Third potash layer of the Starobin potash salt deposit were studied. The stability of the development workings and the bottomhole space of the longwalls and the nature of interaction of the bottomhole lining with the adjoining rocks were studied. The intensity of manifestations of rock pressure in the longwalls and the nature of roof subsidence of the bottomhole region and its fall behind the face support were assessed. The nature of the loading speed distribution of the bottomhole lining for the treatment cycle was clarified. The rate of change of the loading before the heading and during this process and the loading rate of the bottomhole lining are taken as the main load support indicators for the treatment cycle. The cyclical nature of the change in the magnitude of these indicators in the interval of 10–12 treatment cycles is revealed. Their dependence on elastic stresses and creep of roof rocks after the formation of a new face is shown. The presence of the dynamic component of the load of the bottomhole lining due to the factor of the speed of the bottomhole movement was established. The influence of the deformation of rocks in the troughs of displacement on the bottomhole lining has been established. At the same time, it is shown that over a time interval of more than 2 years, the intensity of deformation of the rocks is significantly reduced. The possibility is shown how to determine the mean spacing of the secondary rock subsidence of the main roof and to identify anomalies associated with the boundaries of tectonic dislocations, faults and subsidence troughs by analyzing the dynamics of the accumulated deviations from the average of load support indicators. Recommendations have been developed on rational and safe parameters for maintaining the bottomhole region and the development workings of the lower longwalls with the slice pillarless extraction of the Third potash layer.
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