Abstract Numerical modelling has become an important tool in the underground rock bolt reinforcement designing process. provides advantage of easily and quickly simulating complex geometries mechanisms with sensitivity analyses. However, a numerical model needs to be calibrated using mathematical solutions, lab testing or actual in-situ observations measurements (which is preferred method) befo...

In this study, analytical models considering different material and geometry for ‎both single and double-lap bolted joints were reviewed for better understand how to ‎select the proper model for a particular application. The survey indicades that the ‎analytic models selected for the adhesively single or double bolted lap joints, as well ‎as T, scarf, and stepped joints, with linear material pr...

In order to solve the problem of safe and rapid excavation support roadway with large section extra-thick top coal under complex geological conditions, deformation mechanism control are analyzed by means field investigation, numerical simulation, theoretical analysis, practice, taking 2203 transportation a mine in Shanxi Province as engineering background. The results show following: (1) concen...

Borehole drilling is required if floor heave in underground mines to be controlled using bolts through the floor. How well bolt anchored depends, part, on borehole’s quality. A major factor that can reduce borehole quality difficulty of discharging rock fragments from a small-diameter drilled at downward angle. Therefore, fuller understanding sizes will aid attempts achieve smooth fragment disc...

This paper deals with modeling and simulation of sparking occurrence in fastening assemblies. The principle consists to calculate in three dimensions the distributions of current density and temperature in the structure over time, and to derive some physical criteria to estimate the possibility of sparking occurrence. Simulations are performed with a Finite Volume Method in time domain and an u...

A fuzzy-logic controller supporting the manufacturing of wind turbines and the bolt tightening of their hubs has been designed. The controller embeds assembly error recognition capability and detects tightening faults like misalignment, different threads, cross threads and wrong or small nuts. According to this capability, K-nearest classifiers have been implemented to cluster the output contro...

We present Bolt, a data management system for an emerging class of applications—those that manipulate data from connected devices in the home. It abstracts this data as a stream of time-tag-value records, with arbitrary, application-defined tags. For reliable sharing among applications, some of which may be running outside the home, Bolt uses untrusted cloud storage as seamless extension of loc...

OBJECT Metallic particles contained in antihuman bombs increase the number of fatalities. The ballistics of these particles depends on the explosive that is used, the distance from the explosion, the shape of the particle projected, and the biomechanics of the injured tissue. The authors present their experience with penetrating spherical bolt injuries to the brain. METHODS The authors retros...

Red shale is widely distributed among the deep mine areas of Kaiyang Phosphate Mine, which biggest underground phosphate China. Because effect various factors, such as high stress, ground water and so on, trackless transport roadways in were difficult to effectively support for a long time by using traditional supporting design methods. To deal with this problem, some innovative works carried o...