Деловой английский язык. Енютина А.А. - 15 стр.

                                          15


Several varying factors must be taken into account when designing the drilling
pattern: the rock drill ability and blast ability, the type of explosives, blast vibra-
tion restrictions, and accuracy requirements of the blasted wall etc. Since every
mining and construction site has its own characteristics, the drilling pattern is
designed specially to it.
      Many mines and excavation sites still plan their drilling patterns manually,
but modern computer programs are also widely used, and they facilitate to mod-
ify the patterns and predict the effect of changes on drilling, charging, loading
and production. Drilling pattern design in tunneling and drifting is based on the
following factors: tunnel dimensions, tunnel geometry, hole size, final quality
requirements, geological and rock mechanics conditions, availability of explo-
sives and means of detonation, expected water leaks, vibration restrictions, drill-
ing equipment. Miners typically have several variations of drilling pattern to
take into account the changing conditions along each tunnel. Drifting in mines is
carried out with 5 to 10 drilling patterns for different tunnel sizes (production
drifts, haulage drifts, draw points, ramp etc.). When designing a drilling pattern,
the main aim is to ensure the optimum number of correctly placed and accu-
rately drilled holes.

                                      Задания

     1. Переведите текст на русский язык.
     2. Ответьте на вопросы к тесту:
     a) Why are the rock drill ability and blast ability very important for drilling
pattern design?
     b) How do computer programs help in designing a drilling pattern?
     c) What is the main aim when designing a drilling pattern?
     3. Переведите на английский язык следующие предложения:
     a) Выбор (choice) бурильного оборудования и количества ВВ
в значительной степени зависит от буримости и взрываемости породы.
     b) При буровзрывных работах должен учитываться ряд (number) важ-
ных факторов.
     c) Для каждого рудника проектирование буровзрывных работ осуще-
ствляется индивидуально.