Rock bolt used as roof bolt is a main method to provid safe working environment for miners, prevent ground falls and save human lives and properties from hazards. Roof bolting structure is scientificaly calculated by engineers according to the rock and earth conditions, it is a great improvement compared with the old standing support. As rock bolt rebar is the main force bearing part, it is of great importance to understand and use it wisely in mining underground support system.
Roof Bolt Development in Mining
Roof bolt specification include the rock bolt type, tensile strength, stress level,length, etc. Although engineers has experiences and knowlege to analyze the underground situation, the understanding is still in-efficient. Various types of rock bolts have been developed for now, and they all work in some specific conditions, it is hard to say which type is better.
- Mining underground roof falls accident happens for more than 1000 times every year.
- Inorder to fully research roof bolting system, engineers and institutes has been following evaluation of mining roof fall incident allover the country.
- Rock bolt specifications and its stress levels can be used to consider the capacity, 3 basic ones are rock bolt length, rebar tension, grout length.
why Rock Bolt Design Matters in Mining
The portion where the work is carried out while its construction is called the face (heading) and all efforts are made in advancing this face as fast as possible till the end of tunnel is reached.
Rock bolts are the first line of defense protecting mineworkers from the hazards of ground falls. Because rock bolts utilize the inherent strength of the rock mass, they have many advantages when compared with earlier standing support systems. Due to their central importance, roof bolts have received more research attention than any other ground control topic, with the possible exception of coal pillars.
Roof bolt design consists in specifying the proper bolt type, capacity, length, and pattern for a particular roof rock, stress level, and application. The interactions between these variables are very complex, and our understanding of their mechanics remains imperfect. Numerous roof bolt design methods have been proposed over the years, but none has gained widespread acceptance by the coal mining industry.