【摘要】 本文介绍了在城子矿孤立煤柱开采过程中,采用激发地音观测、评价不同条件下煤体应力状态。激发地音观测资料表明,根据地音事件的主频率,应力降、卸载范围的时间变化,能对以往所采用的经验性预防措施给予合理解释。更多还原

【Abstract】 The paper introduces that fhrough observation of excited grund sound, the stress states of coal body under various conditions evaluated in the process of mining the isolated pillars at Cheng Zi colleiry.The observed information of excited ground sound shows that bosed on the main frequency of the ground sound event, stress drop and time change of unloading range we can give a reasonable explanation for the experimental preventative measures used used in the past.更多还原