摘要
为研究煤层倾角变化对锚杆支护回采巷道围岩受力、变形特征的影响,结合淮南矿区大倾角煤层开采地质和技术条件,建立倾斜煤层巷道受力分析模型,对煤层倾角对锚杆支护回采巷道围岩受力、变形特征的影响特征进行了分析。研究结果表明:随着煤层倾角的增大,顶板的垂直下沉量逐渐减小,巷道高帮和低帮煤体的稳定性降低,高帮和低帮的变形与围岩压力基本呈线性的关系,围岩压力对高帮变形的影响程度大于低帮。根据大倾角煤层巷道围岩变形力学特征,提出了合理的非对称锚网索支护参数和控制对策,并进行了工程实践,当巷道开挖5-7天后,分别在实体煤巷道和沿空巷道施作高帮预应力锚索,能够很好的控制巷道围岩非对称变形,取得了良好的技术经济效果。
In order to research the affection of the changes of the coal seam pitch to the stress characteristics of gateway surrounding rock,according to the geological and technical conditions of Huainan mining area steeply dipping seam,the mechanical model of inclined seam was established,it also analysed the stress and deformation characteristics of the gateway surrounding rock. The results show that: with the increase of seam dip angle,the amount of vertical subsidence of the roof gradually reduced,the stability of the high-side and low-side coal reduced gradually,the deformation of the high-side and low-side coal has a basic linear relationship with the surrounding rock pressure.The influence of surrounding rock pressure on high-side deformation was greater than that on low-side. According to the mechanical and deformation characteristics of surrounding rock,the reasonable asymmetric anchor net supporting parameters and control countermeasures were put forward,and into engineering practice,after the gateway was excavated 5-7 days,the prestressed anchorage cable for high-side in the gateway was set up,it could have very good effect to control the asymmetric deformation of surrounding rock and achieve a good technical economic effect.
出处
《地下空间与工程学报》
CSCD
北大核心
2013年第S1期1645-1651,共7页
Chinese Journal of Underground Space and Engineering
基金
国家重点基础研究发展计划(973)项目(2010CB226806)
安徽省高等学校优秀青年人才基金资助项目(2010SQRL044ZD)
安徽省高等学校省级自然科学研究资助项目(KJ2013A098)
关键词
倾斜煤层
回采巷道
围岩变形
支护参数
控制对策
slant coal seam
gateway
surrounding rock deformation
support parameter
control countermeasures.
