In order to master the instability mechanism of coal pillar, the method of coal pillar fracture digitization was improved, and the “basic measurement scale-borehole comprehensive parameter method” which can realize the evaluation of a complex fracture network was proposed. The evaluation results indicate that the coal pillar failure exhibits obvious zonal characteristics and the damaged coal pillar can be divided into the stripping area, the yield area and the load-bearing area. In light of the characteristics of coal pillar failure and the limit equilibrium theory, the model of coal pillar stability evaluation was established. Furthermore, the model was used to evaluate the stability of coal pillar in Baodian Coal Mine. The safety factor is 1.54 which meets the current requirement for safe production. Meanwhile, according to the model of coal pillar stability evaluation, measures for controlling coal pillar stability, namely roof pre-cutting, re-anchoring, and long and short injection, were proposed.

为了掌握煤柱失稳的机理，改进了煤柱断裂数字化的方法，提出了可以实现复杂裂隙网络评价的“基本测量尺度-井眼综合参数法”。评价结果表明，煤柱破坏表现出明显的带状特征，损坏的煤柱可分为剥离区，屈服区和承重区。根据煤柱破坏的特点和极限平衡理论，建立了煤柱稳定性评价模型。此外，该模型还用于评估宝店煤矿的煤柱稳定性。安全系数为1.54，符合当前安全生产的要求。与此同时，