条带煤柱长期受力变形特征研究

为研究条带煤柱的长期受力变形状态,采用钻孔应力计与位移监测仪对岱庄煤矿条带煤柱进行了长期观测研究。研究表明:岱庄煤矿70 m条带煤柱分为58 m弹性核区、4～5 m塑性破坏区和1 m完全破碎区;通过对实测数据进行修正,确定了煤柱各分区的实际支撑能力,煤柱5 m深度部位的实际长期支撑能力11.896 MPa;条带煤柱中间50 m的平均长期支撑能力为29.5 MPa,承载能力大于采留尺度范围内的覆岩重量;同时冒落的矸石充填采空区,对基本顶和覆岩具有一定的支撑作用,故该煤柱是长期稳定的。

Study on Long-Term Stress and Deformation Characteristics of Strip Pillar

To study the long-term stress and deformation states of strip pillar,the strip pillars in Daizhuang coal mine were monitored with borehole stress-meters and displacement monitors for a long time.The study results show that the strip pillar of 70 m in width can be divided into 58 m elastic zone,4～5 m plastic failure zone and 1 m fully broken zone.The actual support ability of each zone is determined based on the correction of measured data,for example,the actual long-term support ability of the strip pillar in depth of 5 m is around 11.896 MPa,while the average long-term support ability of the intermediate part of 50 m in width is 29.5 MPa,and the bearing capacity of pillar is greater than the weight of overlying strata within the mining and reservation width.Meanwhile,the goaf is filled by the falling gangue,which can certainly play a role in supporting the roof and overlying strata,so the strip pillar can keep stable for a long time.