A case study on the efficacy of different roof bolting schemes in Lhoist North America’s Crab Orchard Mine  

作　　者：Reece Kurre Gabriel Walton 

机构地区：[1]Stantec Consulting Services Inc.,Walnut Creek,CA 94597,USA [2]Department of Geology and Geological Engineering,Colorado School of Mines,Golden,CO 80401,USA

出　　处：《International Journal of Mining Science and Technology》2020年第1期99-104,共6页矿业科学技术学报（英文版）

基　　金：The research conducted for this study was funded by the National Institute for Occupational Safety and Health(NIOSH)under Grant Number 200-2016-90154.

摘　　要：Roof bolting has long been used in underground mines across the world to provide ground support.Modern roof bolts are cheap and easy to install with the use of specialized machines as a part of the production cycle. Lhoist North America’s Crab Orchard Mine is an underground room and pillar limestone mine that uses mechanically anchored roof bolts for ground support. The mine currently employs two different roof bolting patterns: a standard 1.5 × 1.5 m pattern, and another 0.8 × 0.8 m pattern for use in areas with particularly hazardous roof conditions. The purpose of this study is to evaluate the relative effectiveness of each bolting pattern. A series of numerical models were created using Roc Science’s RS2. The models were based on a symmetrical section of the mine at its deepest point, and were modeled using generalized Hoek-Brown failure criterion along with a discrete fracture network. A series of sensitivity analyses were performed on the models by varying parameters such as joint friction angle, crack persistence, joint randomization, and tensile strength of the limestone. Based on the results of the original models and sensitivity analyses, it appeared that the standard bolting pattern provided sufficient roof support capacity under almost all the expected conditions at the mine, since safety factors below the design value of 1.5 were only found for individual bolts in a few of the worst test cases considered.These results can help improve the mine’s productivity and reduce operating costs without compromising safety.

关 键 词：Numerical modeling Mining ROOF BOLTING ROOF stability Analysis RocScience’s RS2 UNDERGROUND STONE 

分 类 号：TD35[矿业工程—矿井建设]