详情

当前位置：首页> 国外交通科技报告数据库 >详情

原文传递 Incorporating Topographic Stress Perturbations and Geological Structures into Roof Stability Forecasting in Underground Mines.

题名：	Incorporating Topographic Stress Perturbations and Geological Structures into Roof Stability Forecasting in Underground Mines.
作者：	Griffith, W. A.
关键词：	Topography, Mining engineering, Rock mechanics, Underground mining, Underground construction, Geologic surveys, Surface properties, Structural design, Tunneling, Models, Roof supports
摘要：	The original intent of this project was to study the impact of topography on roof stability in shallow underground mines and tunnels, and demonstrate that complex three-dimensional surface topography can be incorporated into mine planning in an efficient work-flow utilizing modern datasets and computational tools. These goals were to be achieved by: (1) Creating a 3D model of the topography around the mine as determined by freely-available airborne Light Detection and Ranging (LiDAR) from the Ohio Statewide Imagery Program (2) Calculating, in 3D, the stress perturbations introduced by topography and excavations on top of the regional tectonic stress state; (3) Evaluating the effect of the topographically perturbed stress state and geologic structures on roof stability in the mine by building local models of mine failure that incorporate mapped faults and fractures, the local mine geometry, and the topographically perturbed stress state as far-field boundary conditions, and (4) Comparing the local models to in-mine observations of roof failure in order to evaluate the success of the topographic models in modeling the heterogeneous stress field. We achieved the specific aims of this project by: (A)Showing in a case study of the Carrol Hollow Mine that topographically-perturbed stresses can be evaluated in an efficient and effective manner by incorporating topographic data, regional stress data, mine survey data, and geologic observations in a Boundary Element Method modeling environment as outlined in Griffith et al. (2014). (B) We also showed that geological structures such as faults that are difficult to identify before mining may be identified a priori using similar methods as outlined in Elizalde et al. (2016). (C) We took our investigations beyond the original specific aims by developing numerical tools to advance current BEM models and allow the incorporation of anisotropic rock properties (meaning that the response of rocks to an applied force depends on direction of the force - this a typical characteristic of real rocks), a particularly important advance for modeling stresses and displacements in sedimentary and foliated metamorphic and viscoelastic rocks. These advances are outline in great detail in Molavi et al. (2014), Pan et al. (2014), Molavi and Pan (2015), and Pan et al., (2015).
报告类型：	科技报告