Most autonomous navigation systems used in underground mining vehicles such as load–haul–dump (LHD) and trucks use 2D light detection ranging (LIDAR) sensors representations/maps of the environment. In this article, we propose 3D LIDARs existing simultaneous localization mapping (SLAM) jointly with methods to produce or update grid maps tunnels that may have significant elevation changes. Exist...

The disturbance depth of traffic load has a direct impact on the stability room-and-pillar mining goaf. To quantitatively calculate relationship between and influencing factors, 49 groups horizontal combinations different parameters are designed in this study, based orthogonal experimental design method. Midas GTS is used to simulate obtain corresponding data. A multivariate linear regression a...

This paper gives an overview of the difficulties associated with the design of hard rock pillars in South African mines. Recent examples of large scale pillar collapses in South Africa suggest that these were caused by weak partings which traversed the pillars. Currently two different methods are used to determine the strength of pillars, namely, empirical equations derived from back analyses o...

In this paper, the edge strain relaxation of InGaN/GaN MQW micro-pillars is studied. Micro-pillar arrays with a diameter 3–20 μm were prepared on blue GaN LED wafer by inductively coupled plasma (ICP) etching. The peak wavelength shift caused was tested using micro-LED pillar array room temperature photoluminescence (PL) spectrum measurements. results show that there nearly 3 nm between micro-p...

The condition of the coal pillars remained in room-and-pillar gobs is complicated. stresses loaded on pillar floor may be transmitted and overlapped. It changes stress environment lower seam roof, leading abnormal periodic weighting. In procedure 3?1 mining Huoluowan Coal Mine, ground high while working face passing through room overlying 2?2, to hydraulic shield being broken. this paper, theor...

To introduce a new device for catheter placement of an external ventricular drain (EVD) of cerebrospinal fluid (CSF). This device was composed of three portions, T-shaped main body, rectangular pillar having a central hole to insert a catheter and an arm pointing the tragus. The main body has a role to direct a ventricular catheter toward the right or left inner canthus and has a shallow longit...

In recent years, autonomous solutions in the multidisciplinary field of mining engineering have been an extremely popular applied research topic. This is a result increasing demands society on mineral resources along with accelerating exploitation currently economically viable resources, which lead sector to turn deeper, more-difficult-to-mine orebodies. An appropriate data management system co...