METHOD FOR TESTING SOILS BY STATIC PROBING Russian patent published in 2007 - IPC G01N3/42 

FIELD: testing equipment engineering.

SUBSTANCE: indenter held on a bar is forced into soil at constant speed. Indenter immersion depth and soil resistance force counteracting the indenter immersion are continuously recorded and soil resistance characteristics at given depth are calculated. Indenter used is shaped as regular three-sided pyramid and is capable of turning relatively to the bar in any direction in any plane which passes through the longitudinal axis of the bar. Firstly, pyramidal indenter is forced in for its whole height at 1,5m/min speed with prevented rotation relatively to the bar, then it is immersed for additional 5-10 mm at up to 5 mm/min speed without prevention of its rotation relatively to the bar with continuous recording of rotation angle of main axis of the pyramidal indenter relatively to longitudinal axis of the bar. On basis of measurement results, the following parameters are calculated: specific resistance of soil to immersion of pyramidal indenter, soil elasticity coefficient, maximum resistance of soil to shifting, specific crack-forming work of soil, magnetic azimuth of soil weakening direction at given testing depth.

EFFECT: increased precision and trustworthiness of tests, lowered effort.

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