A nonlinear hyperbolic partial differential equation modelling the etching of glass by powder blasting is proposed. This equation is solved by means of the characteristic strip equations. The analytical solution is in reasonable agreement with measurements. AMS Subject Classification: 35F25, 35L60, 33C05.

This study aims to investigate the fracturing characteristics of double-hole blasting under action coupled static stress and delayed time explosion. A total thirteen explosive tests were carried out on rectangular concrete blocks with different constraints. The test wrapped in steel mesh bed prevent flying away cracked after blasting. After blasting, surface area crater was measured, all pieces...

Excessive exposures to airborne crystalline silica have been known for over 100 years to pose a serious health hazard. Work practices and regulatory standards advanced as the knowledge of the hazards of crystalline silica evolved. This article presents a comprehensive historical examination of the literature on exposure, health effects, and personal protective equipment related to silica and ab...

Erdenet copper-molybdenum deposit is the biggest one in world and has a significant impact on Mongolian society economy. Today LIEBHERR-994B hydraulic shovels from Germany, electric including EKG-10 EKG-15 Russia operate for mining works, dump truck BelAZ - 75130 used transportation. The causes of shovel downtime are classified as technical, technological, organizational. During study period, 4...

Tungsten, essential in the industrial, military, and civilian domains deemed a strategic resource by various nations, necessitates careful consideration room pillar mines due to potential instability safety hazards posed untouched mine pillars, making tungsten recovery crucial for worker economic gain. This research aims provide guidance recovering from pillars mining operations safer workers X...

Purpose The purpose of this paper is to solve the problem that location initiation point cannot be measured accurately in shallow underground space, proposes a method, which based on fusion multidimensional vibration sensor information, locate single sources. Design/methodology/approach First, paper, using characteristics low multipath interference and good P-wave polarization near field, adapt...

A methodology for determining overbreaks in hard rock tunnel construction using the drill-and-blast technique is presented this paper. The was developed and applied to crystalline medium- thick-bedded limestone, but it can be used any jointed mass. Overbreaks are inevitable tunnelling a low-confinement environment (shallow tunnels up several hundred meters deep) as result of wedge failures alon...

This paper describes a new proof tool for deciding bit-vector problems in HOL4. The approach is based on “bit-blasting”, wherein word expressions are mapped into propositional formulas, which are then handed to a SAT solver. Significantly, the implementation uses the LCF approach, which means that the soundness of the tool is guaranteed by the soundness of HOL4’s logical kernel.

During the construction of tunnel based on drilling and blasting method, a large amount wastewater will be produced, in which types concentrations main pollutants change regularly with continuous circulation process. In this paper, Hengwu drilling, post blasting, slag discharge initial support stages is sampled detected, pollutant laws each stage are analyzed, set pair analysis method used to e...