摘要
为解决高应力复合顶板工作面巷道支护维护难的问题,通过现场调查,对已有巷道围岩破坏原因进行分析,得出原有巷道支护方式和参数不具有针对性。结合巷道断面和顶板岩性相变大的特征及巷道破坏特点,通过调整巷道两帮支护的锚杆间距,增加了支护密度,根据复合顶板岩性不同,将顶板支护分为4种方案,分别布置具有针对性的锚索补强支护,同时增大了锚索直径,强化了锚索支护作用。采用FLAC数值模拟软件对巷道在优化支护方案下的应力分布和变形特征进行模拟分析,巷道变形量减少,整体稳定,验证了支护优化方案的合理性。经工程实践和支护效果观测表明,巷道顶板下沉量最大为137 mm,两帮移近量最大为365 mm,顶板深部最大观测离层值为14 mm,保证了巷道稳定性,达到了预期目标。
In order to solve the difficult problem of roadway support and maintenance in high stress compound roof working face,through on the spot investigation,analyzed the failure reason of existing roadway surrounding rock,the original support mode and parameters are not targeted.Based on the characteristics of large rock transformation and damage characteristics of the roadway,the density of support is increased by adjusting the pitch of the anchor bars of the roadway,according to the different rock properties of the composite roof,the support of the roof is divided into four kinds of schemes,the anchor cable reinforcement support is arranged separately,the diameter of the anchor cable is increased,and the role of anchor cable support is strengthened.The FLAC numerical simulation is used to simulate and analyze the stress distribution and deformation characteristics of the roadway under the optimized support scheme,the deformation of the roadway is reduced and the overall stability is verified,which verifies the rationality of the support optimization scheme.The engineering practice and the observation of supporting effect show that the maximum subsidence of roadway roof is 137 mm,the maximum displacement of two sides is 365 mm,and the maximum observed delamination value of deep roof is 14 mm,which ensures the stability of roadway and achieves the expected goal.
作者
黄春光
Huang Chunguang(Zhongyun International Engineering Co.,Ltd.,Zhengzhou 450007,China)
出处
《能源与环保》
2019年第6期130-135,共6页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
关键词
高应力
复合顶板
大断面煤巷
支护优化
数值模拟
工程应用
high stress
composite roof
large section roadway
optimized support method
numerical simulation
engineering application
