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Effects of thickness of roof layers on optimum design of truss bolt system using finite element modeling techniques

机译:顶板层厚度对桁架锚杆系统优化设计的影响及有限元建模技术

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摘要

In underground excavations, optimum design of reinforcement systems is largely based on geological features of the surrounding rock such as in-situ stress distribution, rock strength properties, thickness of the layers, etc. In current design of truss bolt systems these parameters are yet to be considered. In this study, effects of changing thickness of roof layers on optimum design of truss bolt have been investigated using three stability indicators, namely reduction in the loosened area above the roof, number of plastic points and horizontal movement on the first bedding plane. Total of 7 different bedding configurations have been generated and 100 different truss bolt designs have been tested on each bedding configuration. Results showed that by changing the thickness of the roof layers, the optimum design of truss bolt changes drastically. In highly laminated formations, it has been demonstrated that a gently inclined bolt angle is more effective, while by increasing the thickness of roof layers, truss bolt systems with a higher bolt angle and longer bolts, i.e. similar to systematic rock bolt systems, responds better.
机译:在地下开挖中,加固系统的优化设计主要取决于围岩的地质特征,例如原地应力分布,岩石强度特性,层厚等。在目前的桁架螺栓系统设计中,这些参数尚待确定。被考虑。在这项研究中,使用三个稳定性指标研究了改变顶层厚度对桁架螺栓的最佳设计的影响,即减少屋顶上方的松动面积,塑性点的数量以及在第一个铺垫面上的水平运动。总共生成了7种不同的床上用品配置,并且在每种床上用品配置上测试了100种不同的桁架螺栓设计。结果表明,通过改变顶层的厚度,桁架螺栓的最佳设计发生了巨大变化。在高度层压的地层中,已证明平缓倾斜的锚杆角度更为有效,而通过增加顶层的厚度,具有较高锚杆角度和较长锚杆的桁架锚杆系统(即类似于系统岩石锚杆系统)的响应更好。 。

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