METHOD FOR TESTING FOUNDATION SOIL OF PILES WITH GRILLAGE Russian patent published in 2015 - IPC E02D33/00 

FIELD: construction.

SUBSTANCE: in this method for testing the foundation soil of piles with grillage, which includes application of force to the pile with grillage in the form of rigid square plate in plan, registration of the applied force and draft of pile with grillage and calculation of soil resistivity, plate of grillage is made horizontally and symmetrically located with respect to the pile, the following is placed under the grillage: elastic plate, having dimensions of plate of grillage in plan, thickness 0.05-0.1 of size of grillage plate sides, elastic module of 30-50 MPa and coordinate rectangular grid on lateral sides, grillage is moved until the complete contact of elastic plate with the surface of the foundation soil and fixed rigidly on the head of pile, in this case registration of the applied force and draft of pile with grillage is performed synchronously with simultaneous video recording of lateral sides of the elastic plate, and resistance of foundation soil to grillage and pile is calculated by formulas P_r=E·Δε·(S_r-S_s) b P_s=P-P_r, where P_r - resistance force of the foundation soil to the loaded grillage; P_s - resistance force of the foundation soil to the loaded pile; P - force applied to the pile with grillage; E - module of elasticity of the elastic plate; Δε - relative compression of elastic plate under the action of loaded grillage and resistance of foundation soil to the loaded grillage; S_r - surface area of the elastic plate in plan; S_s - cross sectional area of the pile.

EFFECT: simplification and reduction in price of determination of the load distribution on the foundation between the piles and grillage in concrete conditions of construction, definition of distribution of reactive normal stresses of subsurface base along the foot of grillage and increase of reliability of the results during one trial.

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