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Research on failure criteria and collapse height of roadway roof strata based on energy accumulation and dissipation characteristics
Energy Science & Engineering ( IF 3.8 ) Pub Date : 2021-05-30 , DOI: 10.1002/ese3.926
Zhu Li 1, 2 , Hong Zhang 1 , Ze Jiang 1 , Guorui Feng 1, 2 , Jiaqing Cui 1 , Jingkai Ma 1
Affiliation  

Roof collapse is a form of rock failure driven by energy release. The rectangular elastic thin plate (RETP) model, widely used in coal mining engineering research, reflects the law of the movement of overlying strata of a coal seam. The stress distribution regularity of each delamination can be analyzed using the theoretical model of RETPs. In this study, a new method for determining both the height of the caving zone and the damaged area of the roadway roof is developed based on the energy evolution law. The damaged area and the oval-shaped boundary of each stratum are determined using the damage criterion deduced by calculating the strain energy of the elementary volume. As a case study, the collapse height was obtained by accumulating the thickness of damaged strata, and the length of bolts was increased from 2.2 m to 2.8 m, effectively preventing the reoccurrence of a roof collapse for the No. 30102 working face in Nanliang Coal Mine. In addition, the vertical boundary of the caved zone can be outlined by connecting and fitting the end vertexes of the minor axis in the oval-shaped damaged area of the RETPs. The supporting angle of the bolts in two side walls of the roadway was decreased from 75° to 70°. This method was verified and applied in a roof collapse investigation by determining the length and drilling angle of the anchor rod and anchor cable required to develop reasonable support schemes. The results of this research can be used for ensuring safety in coal mining and subway or tunnel construction in China.

中文翻译:

基于能量聚散特性的巷道顶板地层破坏准则及倒塌高度研究

屋顶坍塌是一种由能量释放驱动的岩石破坏形式。矩形弹性薄板(RETP)模型在煤矿工程研究中广泛使用,它反映了煤层上覆地层的运动规律。可以使用RETPs的理论模型分析每个分层的应力分布规律。本研究基于能量演化规律,提出了一种确定巷道顶板崩落区高度和破坏区高度的新方法。使用通过计算基本体积的应变能推导出的损伤准则确定各层的损伤区域和椭圆形边界。作为案例研究,通过累积损坏地层的厚度获得倒塌高度,并将螺栓长度从2.2 m增加到2.8 m,有效防止南梁煤矿30102工作面再次发生顶板塌陷。此外,通过连接和拟合RETPs椭圆形损坏区域的短轴末端顶点,可以勾勒出塌陷区的垂直边界。巷道两侧壁螺栓的支撑角由75°减小到70°。通过确定制定合理支撑方案所需的锚杆和锚索的长度和钻孔角度,该方法在屋顶倒塌调查中得到验证和应用。该研究成果可用于保障我国煤矿开采和地铁、隧道建设的安全。塌陷区的垂直边界可以通过连接和拟合RETPs椭圆形损坏区域的短轴末端顶点来勾画。巷道两侧壁螺栓的支撑角由75°减小到70°。通过确定制定合理支撑方案所需的锚杆和锚索的长度和钻孔角度,该方法在屋顶倒塌调查中得到验证和应用。该研究成果可用于保障我国煤矿开采和地铁、隧道建设的安全。塌陷区的垂直边界可以通过连接和拟合RETPs椭圆形损坏区域的短轴末端顶点来勾画。巷道两侧壁螺栓的支撑角由75°减小到70°。通过确定制定合理支撑方案所需的锚杆和锚索的长度和钻孔角度,该方法在屋顶倒塌调查中得到验证和应用。该研究成果可用于保障我国煤矿开采和地铁、隧道建设的安全。通过确定制定合理支撑方案所需的锚杆和锚索的长度和钻孔角度,该方法在屋顶倒塌调查中得到验证和应用。该研究成果可用于保障我国煤矿开采和地铁、隧道建设的安全。通过确定制定合理支撑方案所需的锚杆和锚索的长度和钻孔角度,该方法在屋顶倒塌调查中得到验证和应用。该研究成果可用于保障我国煤矿开采和地铁、隧道建设的安全。
更新日期:2021-05-30
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