巨厚煤层全煤巷道破坏机理及注浆效果数值模拟  

Numerical Simulation Research of Failure Mechanism and Grouting Effects of Full Seam Gateway in Extremely Thick Coal Seams

作　　者：乔卫国[1,2] 程少北[1,2] 林登阁[1,2] 李惠[1,2] 朱军[1,2] 

机构地区：[1]山东科技大学土木建筑学院,山东青岛266590 [2]山东省土木工程防灾减灾重点实验室,山东青岛266590

出　　处：《金属矿山》2014年第2期26-29,共4页Metal Mine

基　　金：教育部新世纪优秀人才支持计划项目(编号:NCET-07-0519);长江学者和创新团队发展计划(编号:IRT0843);山东科技大学研究生科技创新基金项目(编号:YC130313)

摘　　要：对于几十米、甚至高达几百米巨厚煤层,巷道全部位于煤层当中,由于煤层多松软、破碎,在煤层深部没有稳定的锚固基点,锚杆(索)的锚固力较差。本研究针对新疆准东矿巨厚煤层全煤巷道复杂地质特征,结合室内岩石力学实验并借助有限差分软件FLAC3D对注浆效果进行了数值仿真模拟。分析结果表明注浆对松软破碎的煤岩体有很好的加固效果,能大范围提高围岩力学参数,从而提高锚杆(索)的可锚性,抑制围岩塑性区向深部发展,控制围岩变形。将浆液在煤岩体裂隙中扩散范围定义为"注浆加固体等效层",分别模拟了1、1.5、2.0、2.5、3.0、4.0 m等6种不同的浆液扩散半径,对比论证确定2.5 m为最佳的注浆深度。研究结果对指导巨厚煤层全煤巷道安全经济合理支护具有重要意义。For extremely thick coal seam of dozens of meters, even hundreds of meters, roadways are all located in coal seam. Due to its looseness and brokenness, and without stable anchoring base in deep coal seam, the anchoring force was greatly reduced. Regarding to the complex geological conditions of East Junggar full seam gateway in Xinjiang, a numerical simulation was conducted by using the finite difference software FLAC3D and in combination with the rock mechanical tests at laboratory , to simulate the grouting effects. The results indicated that grouting in loose and broken coal seam has a good reinforcement effect on coal seam, and improves the mechanical parameters of surrounding coal seam to promote anchoring performance and prevent further development of plastic zone and control the deformation of the surrounding rock. The range of grouting diffusion in coal and rock fracture is defined as the equivalent grouting layer and six different grouting diffusion radius of 1. 0,1. 5 ,2. 0, 2.5,3.0,4.0 m are simulated respectively. By comparison ,2.5 m is determined as the optimum grouting depth. This research is of great significance in guiding safe, economical and reasonable supporting of full seam gateway in extremely thick coal seam.

关 键 词：全煤巷道 可锚性 注浆 数值模拟 

分 类 号：TD823[矿业工程—煤矿开采] TD322[矿业工程—矿山开采]