中文摘要：

为了解决深部复杂地质条件下瓦斯压力测试中存在的裂隙封堵问题,提出基于巷道围岩应力分布的阶梯式封孔技术,通过对裂隙区和塑性强化区进行多级封孔来提高测压准确性;依据煤岩弹塑性软化模型模拟计算了巷道开挖后周边围岩塑性区半径,并通过FLAC3D软件进行了模拟验证,为一级钻孔封堵深度提供了数据支持;在薛湖煤矿29采区进行了现场应用,结果表明：阶梯式封孔技术在测压时间上平均减少了29.4%,绝对时间节省了8.3d,在测压结果上平均提升了65.6%,测试结果更加接近煤层原始瓦斯压力,具有广泛应用价值。

英文摘要：

In order to solve the problem of fracture sealing under complicated geological conditions in seam gas pressure measuring,the technology of gradually reducing sealing is proposed based on the stress distribution of roadway surrounding rock.Multistage sealing was applied in fracture zone and plastic enhanced areas to enhance the measurement accuracy.Based on the coal-rock elastic plastic softening model,the plastic zone radius of surrounding rock after roadway excavation was simulated,which was verified by FLAC3 Dsoftware which provides the data support for a borehole plugging depth.Field application is carried out in Xuehu Coal Mine No.29 district.The results show that the variable diameter sealing technology in reduced 29.4% of measuring time,equivalent to about 8.3 days,the manometric results was enhanced by 65.6%,which close to the original coal seam gas pressure.