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  1. Give English equivalents of the following:

бурове обладнання, вийти з ладу, часті заміни обладнання, підвищити ефективність, за * певних умов, експериментально доведено, гартована сталь, одиниця зношуваності, шершавість, швидкість ковзання, змазувальний матеріал, охолоджуюче середовище, магнезіозалізистий.

  1. Make a written translation of the following:

Methods for assessing abrasive properties of rocks are fairly numerous, but, so far, there exists no universal and generally accepted one. At the basis of most methods lies the measurement of the volume or mass of the metal worn out during friction against the rock under certain conditions constant for a given method. Among laboratory procedures, the one proposed by Prof. L. A. Shreyner is most suitable for appraising abrasiveness of rocks. In essence it consists in that a reference ring made of test material (steel, hard alloy), tightly pressed with its lateral cylindrical surface against the horizontal ground surface of a test rock sample under the action of a pre-set force, revolves about the horizontal axis at a constant speed. The rock

sample advances relative to the ring at a certain pre-assigned speed. Disintegration products resulting from the friction of the ring against the rock surface are carried away by a jet of water supplied to the site of the, contact. The abrasive properties are judged by the volume of the broken down material of the ring and rock along the friction route of 1 m.

  1. Supply a heading for Text 1.

  2. Make a plan to Text 1 and retell it.

CONTROL TASKS

    1. Answer the questions:

      1. What is the rock made up of?

      2. What coefficient does porosity characterized by?

      3. How does the volume mass of porous rocks of a similar mineralogical composition change with depth?

      4. What does the strength of a rock depend on?

      5. How is the strength of rocks influenced by temperature?

      6. Name three groups that rocks may be classified into by the nature of the relationship between deformation and stress under static load?

      7. What does the plasticity depend on?

      8. What does three-dimensional compression of rocks result in?

      9. What does three-dimensional compression cause?

10 . When does the abrasiveness of rocks manifest itself?

    1. крихкість

      родовище

      глинистии

      когезія

      крупнозернистии

      Give English equivalents of the following:

прська порода

стиснення

модуль пружності

залишкова деформація

інструмент для подрібнення породи

  1. density

  2. volume mass

a) the proportionality constant or factor between normal stress in the rock and relative deformation that corresponds to it

b) the magnitude of stresses under which a rock disintegrates

3 strength

c) the mass contained in the unit volume of its solid phase

4 coefficient of anisotropy

d) the mass of a unit volume of dry rock in its natural state

5 modulus of elasticity

e) the ratio between strength in compression parallel to bedding and that normal to it

6 Poisson's ratio

f) the proportionality constant between the unit longitudinal and lateral deformations

7 stress relaxation

g) the pressure produced as a result of resistance of the surrounding rocks to radial deformation of the segregated volume

8 abrasiveness of rocks

h) a gradual diminution of stresses in a body undergoing continuous deformation

9 lateral pressure

i ) the ability of rocks to wear out metals and hard alloys in | the course of friction

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