基于FLAC3D的薄基岩区覆岩破坏高度数值模拟研究

摘要

为获得薄基岩区覆岩采动破坏规律,以兴源矿6412工作面为例,根据开采技术条件和岩石力学参数,应用FLAC3D数值模拟软件,建立了数值计算模型,对上覆岩层随工作面开采引起的塑性区分布及应力进行了研究,确定了导水裂缝带发育形态和高度,并采用经验公式法与数值模拟结果进行了对比.结果表明:该工作面若按采高2.8m计算,则导水裂隙带发育高度为44.3m,易波及到第四系冲积层砂卵石含水层.因此,该工作面应采用限高开采或改革采煤方法,才能实现安全开采.%In order to obtain overburden failure law induced by mining under thin bedrock,taking 6412 working face in Xingyuan Coal Mine for example,a numerical model was built based on mining conditions and rock mechanics parameters by FLAC3D numerical simulation software.The distribution of plastic zone and stress for overlying rock layers affected by mining were studied,to determine the height and shape of water conductive zone.The results are compared with that by empirical formula.The results show that:the height of water flowing fractured zone is 44.3 m on the basis of mining height 2.8 m.It is easily spread to the sand and gravel aquifer in Quaternary alluvium.Therefore,it is necessary to adopt limit mining height or reform mining methods on 6412 working face,so as to realize safe mining.