No abstract

Blasting in opencast mines is characterized by the use of large masses of explosives for a single blast. Blasting is done in a series of several to tens or even hundreds of charges placed in long holes and fired with a millisecond delay. Works are often carried out in the vicinity of buildings; therefore, reducing vibration impact is essential for opencast mines. This paper presents the applicability of the method of time-frequency Matching Pursuit (MP) for analysis of vibration structure. The use of MP analysis enables the development of much deeper and more reliable impact assessments of blasting on the environment.

Abstract. Environmental protection law and geological and mining law require the mineral mining plant to protect its surroundings from the effects of mining operations. This also applies to the negative impact of vibrations induced by blasting works on people and construction facilities. Effective protection is only possible if the level of this impact is known, therefore it is necessary to record it. The thesis formulated in this way has been and continues to be the guiding principle of the research works carried out in the AGH Laboratory of Blasting Work and Environmental Protection. As a result of these works are procedures for conducting preventive activities by open-pit mines in order to minimize the impact of blasting on facilities in the surrounding area. An important element of this activity is the monitoring of vibrations in constructions, which is a source of knowledge for excavation supervisors and engineers performing blasting works, thus contributing to raising the awareness of the responsible operation of the mining plant. Developed in the Laboratory of the Mine's Vibration Monitoring Station (KSMD), after several modernizations, it became a fully automated system for monitoring and recording the impact of blasting works on the surrounding environment. Currently, there are 30 measuring devices in 10 open-pit mines, and additional 8 devices are used to provide periodic measurement and recording services for the mines concerned.

PROBLEMATYKA WYZNACZANIA DOPUSZCZALNYCH ŁADUNKÓW MW W ZRÓŻNICOWANYCH WARUNKACH GEOLOGICZNYCHThis article presents a procedure for determining the safety of explosive charges for their surrounding environment, using a limestone mine as a case study. Varied geological structures, as well as other constructions in the surrounding area of a mine, sometimes necessitate the use of two or more ground vibration propagation equations, and thus a variety of explosive charges, depending on the area of rock blasting. This is a crucial issue for the contractor, as it is important to blast the rock as few times as possible, while using the maximum amount of explosive charge for each blast.

Blasting operations carried out in open-cast mines generate seismic vibrations, which can adversely influence nearby structures. As a result, open-cast mines undertake measures to define the conditions for the execution of blasting operations, which are safe for the surroundings as well as documenting the level of this impact. Documenting the seismic interference through cyclic control measurements and the assessment of this interference carries one disadvantage, which is its periodic implementation. This drawback is eliminated by applying seismic monitoring. In Poland, the influence of blasting on the surroundings is monitored by a system called Mine Vibration Monitoring Station (MVMS). The system was designed and built at the AGH University of Science and Technology in Krakow and has been modernized and updated over the last few years. Presently, it is a remotely controlled system which maintains communication via the internet, with data collected at the central server of the University. Evolution of the system and its technical capabilities are presented in the article.