矿井初步设计中边界防隔水煤岩柱留设探讨

针对一些矿井初步设计中留设边界防隔水煤岩柱不合理而引发矿井老空水矿难的现实,探讨了影响矿井间边界防隔水煤岩柱安全稳定性的因素,提出应充分考虑煤岩柱受覆岩应力破坏变形、覆岩受采动影响产生岩移破坏等,综合分析计算煤柱有效稳定性弹性核区宽度、覆岩导水裂缝带上限岩柱宽度及其抗静水压能力等,择优选取留设矿井边界防隔水煤岩柱。以济宁煤田济宁二矿与三矿边界煤柱的留设为例,计算其边界煤柱留设尺寸为99.56m,较原设计的40m有较大出入,据此对两矿井边界隔离煤柱进行了相应调整,确保了矿井的安全生产。该方法也可用于矿井留设采区、区段隔离煤柱的计算。

Probe into Setting of Boundary Safety Pillar Against Water in Coalmine Preliminary Design

In allusion to the reality of gob water accidents caused by ridiculous setting of boundary safety pillar against water in the coalmine preliminary design, discussed factors impact boundary safety pillar against water security and stability between mines. Safety pillar overburden stress rupture and deformation, overburden mining rock movement should be fully called attention to. Comprehensive analysis and calculation of coal pillar effective stability elastic core region width, overburden water conducted zone upper limit rock pillar width and its hydrostatic pressure resistance etc, choose the best setting of boundary safety pillar against water. To take the setting of boundary coal pillar between Jining No.2 and No.3 coalmines in the Jining coalfield as an example, calculated its size 99.56m, thus a major discrepancy in comparison to the original design, corresponding adjustment carried out, and ensuring coalmine safety in production. The method can be used in computation of winning district setting, coal curtain between districts.