Materiały konferencyjne SEP 1993 - tom 2

Szkoła Eksploatacji Podziemnej '93 O In deep slopes, the common use of stabilizing pillars to provide regional support for containment of the rockburst hazard. These mining layouts have sometimes posed serious problems, but have on balance morę than proven their worth. g) In intermediate and deep stopes, the increasing usage of backfill - motivated on grounds of regional support benefits (reduction in the incidence of rockbursts in longwall mines), but lately at least as strongly in terms of local support benefits (reduction of damaging effects of rockbursts). h) In service excavations and tunnels, the widespread use of grouted-tendon mesh and lace support systems, and the gradual introduction of support elements providing further tailored resistance and yieldability characteristics. 3. An analysis of falls of ground and rockbursts by government mining engineer's office As I mentioned above the Department of Minerał and Energy Affairs (DMEA) - Govemment Mining Engineer's Office division operates the South African Mine's Reportable Accident Statistics System (SAMRASS). The information pertaining to a re |X )rtable mining accident is provided to our Department on specially designed and prescribed forms termed MD 16A, MD 16B, MD 16C and in the case of rockburst or fali of ground accidents also MD 16D. The analysis of the data obtained from the SAMRASS has identified the major problem areas and causes of fatalities. Most fatal accidents occur within two metres of the stopę face, with rockbursts being far and away the main culprit in certain areas. It also appears that in a number of instances, the face support method in use the mines are not able to prevent accidents due to either rockbursts or rockfalls. The State's duty to protect life and limb of its subjects also extends to the mineworker. The State has attempted to achieve this by legislation which is enforced by DMEA through regional mining engineers. However, except for a few broadly phrased regulations, very little legislation has been promulgated on support reąuirements. The reasons for this lack of statutory intervention are that the widely varying conditions between districts and even within individual mines where geoiogical conditions change negate an approach based on definitive layout and support reąuirements. In the light of Ihe above mentioned restraints it was decided to include int the Minerals Act, 1991 a section which provides for codes of practice. A code of practice in respect of strata control systems can be defined as a description of the method to be applied, or the procedure to be followed in connection with all aspects which can possibly contribute towards the minimization of rock related accidents in mines. Also, as mentioned above, >the Safety in Mines Research Advisory Committee (SIMRAC) has been established in terms of the new Minerals Act, 1991. Sekcja III 113