METHOD FOR DETERMINATION OF GROUND STRENGTH BY KERN TESTING BY ROTARY CUT Russian patent published in 2017 - IPC G01N33/24 G01N3/00 E21B49/00 

FIELD: construction.

SUBSTANCE: method includes drilling, test ground blades impeller, the creation of the test ground of radial compressive stresses, standing for experience, annex to the impeller blades step-increasing torque moment, fixing the maximum torque limit tangent shear causing the circuit voltage, the repetition of the experience in a similar plot with another level of compressive radial stress and determination of compressive and values in pairs shear stress of soil strength parameters-angle of internal friction and adhesion, and the test shall be carried out in wells extracted from kern, while the radial compressive stresses are created by compression of the lateral surface of the kern and blade impeller is embedded across the center of the test kern.

EFFECT: expanding the range of measured parameters, increasing the accuracy of the determination and accelerating the tests.

2 cl, 3 dwg