Деловой английский язык. Енютина А.А. - 29 стр.

                                        29


                                   TEST № 20

     Прочитайте текст и письменно выполните задания к нему.

                         Bench height and berm width

      The height of the bench is controlled by the selected loading equipment,
required degree of selectivity, economics and overall design. For economic rea-
sons the bench should be rather high to make drilling and blasting operation
cheaper per ton of material. The loading equipment will finally determine the
maximum height of the bench and also the minimum to some extent. Operating
benches are generally 35 to 40 m minimum width to give sufficient working
room for loading and hauling equipment. But the bench widths left behind, here
called berm, are typically between 5 and 15 m. The width of the berm is designed
to be as small as possible, consistent with access requirements and the ability of
the berm to catch and retain falling rock. If the rock is not homogeneous, but
contains structural discontinuities, local (bench) failures like plane or wedge
failures might occur. These can be predicted as a result of the slope stability
study and the width of the berm can be selected to keep falling debris. At the
crest of the berm there shall be a safety wall to help catch falling rock and to di-
rect rainwater to drain along the berm instead of into the pit. For this reason,
there may be a slight inclination of the berm alongside the pit wall (about 1 %).

                                     Задания

    1. Переведите текст на русский язык.
    2. Ответьте на вопросы к тексту:
    a) What is the height of the bench controlled by?
    b) How wide are operating benches?
    c) What is called berm?
    3. Переведите на английский язык следующие предложения:
    а) Если порода содержит структурные нарушения, она не является од-
нородной.
    b) Местные обрушения могут быть предсказаны в результате изучения
устойчивости склонов.