DEVICE FOR EVALUATION OF CHARACTERISTICS OF ROCK SAMPLES Russian patent published in 2009 - IPC E21C39/00 

FIELD: mining.

SUBSTANCE: invention refers to mining and can be implemented for evaluation of characteristics of rock samples under conditions approximating to bed ones. Device for evaluation of characteristics of rock samples consists of chamber including channel for creating a crimping pressure; also core holder is positioned in the chamber. The core holder is made in form of electro-insulated elastic coat enveloping an upper and lower inserts with its end portions; the end surfaces of the inserts contact the tested sample and are equipped with semi-penetrable membranes. Lower part of the chamber includes the channel for fluid withdrawal, while the upper one includes secured with exterior nut upper end bushing with through hole, wherein puncheon out of dielectric material is installed; the said puncheon includes channels for fluid supply and channels for connection with means of measurement of specific electrical resistance of the tested sample. The said elastic coat is made with end collars conjugated with interior side and end surfaces of the chamber case. The elastic coat is inserted into rigid compound case in form of two joined to one another pairs of perforated semi-cylinders and two pairs of upper and lower shaped perforated semi-circles conjugated with the interior surface of the collars and with exterior ends of each of semi-cylinders. Lower inside portion of the chamber case is made in form of ring step whereon the core-holder is assembled; also this portion is equipped with a lower stepped bushing conjugated with the said ring step, with the end of the chamber case and with the lower insert. The said lower bushing is tied with the chamber case by means of a locking flange and includes a channel for fluid drainage and a channel for connection with means of measurement of specific electrical resistance of the tested sample. The channel for supply of crimping (side) pressure is made in a side wall of the chamber case. The puncheon in its upper part is conjugated with the source of vertical hydraulic pressure - with a piston of a hydro-cylinder.

EFFECT: simplification of design allowing creation of vertical and horizontal constituents of rock pressure.

8 cl, 6 dwg