![]() ![]() Based on the collected data, two indicators were developed to describe rock mass quality. This paper discusses the selected findings of a study carried out on seven excavation sites with diverse mining and geological characteristics. ![]() Mining classifications of rock mass have been developed (e.g., in Germany) and they rely on a number of factors but are often related to local mining and geological conditions. ![]() Although global classifications of rock mass are rarely used in hard coal mines, they are utilised much more frequently during the construction of underground structures such as tunnels. While many factors are considered when choosing appropriate support, these do not include layering or cracking in the excavation ceiling. There are currently three common methods for selecting excavation supports in Polish hard coal mines. This article is published in Engineering Journal (ISSN 0125-8281) : However, long-term stability investigation is necessary. Whenever a smartphone is available, the user can estimate preliminary rock mass stability and support method of tunnel instantly. The application is tested in a tunneling case study as an example. The application results are verified by comparing with Excel standard worksheet. PSU-RQ is easy to use because it reduced the complexity of the theories by numerical logic. The application is programmed by the official programming software from Google, the Android Studio. Android operating system is chosen because it is the most popular operating system in the world. Suitable rock mass classifications for tunnel are rock mass rating (RMR) and rock mass quality (Q system). This research aims to develop an alternative software for Android smartphone, which use for estimating preliminary rock mass stability and suggesting support method for the early state tunnel. Most tunneling is operated in remote area that is difficult to reach. Tunnel safety is one of the most important factors of construction. Nowadays, tunneling is applied to a variety of constructions such as subway station, water supply tunnel and underground mine. ![]()
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