SU1094897A1 - Method of testing soil under static load - Google Patents

Abstract

METHOD FOR TESTING SOIL WITH STATIC LOAD, including immersing a single-blade punch with a barbell into the ground, loading the punch increases, pressing into it, measuring the displacement of the punch in the soil and determining the mechanical characteristics of the soil, characterized in that, in order to achieve performance and accuracy of testing movements of the stamp remove the load, measure the elastic part of the precipitate of the stamp, move the stamp by unscrewing upwards into an undisturbed array of soil, reload the stamp of the air a growing pressing load and cutting the soil § along a cylindrical surface. (L

Description

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The invention relates to engineering, geological surveys for construction, and in particular to methods of testing soils for studying the mechanical properties of soils in field sites.

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A known method of testing soil for compressibility and cutting, including immersion of a blade punch in the ground, application of torque to it and determination of the mechanical properties of the soil. Cl 3 The disadvantages of this method are insufficient information content and accuracy of determining the characteristics of the soil.

 The closest known technical solution to the invention is a method for testing a soil with a static load, including immersing a single-blade punch with a rod in the ground, loading the punch with an increasing depressing load, measuring the displacement of the punch in the soil and determining the mechanical characteristics of the C 2 soil.

The disadvantage of this method is also insufficient information content and accuracy of testing,

The purpose of the invention is to improve the performance and accuracy of testing.

The goal is achieved in that, according to the method of testing a static load, which includes immersing a single-blade punch with a rod in the ground, loading the punch with an increasing pressing load, measuring the displacement of the punch in the soil and determining the mechanical characteristics of the soil, after the termination of the nonperfective stamping, relieve the load, measure the elastic part of the sediment stamp, move the stamp by unscrewing up into the undisturbed soil mass, reload the stamp with increasing pressing load and produce s soil on a cylindrical surface.

FIG. 1 - 6 shows the sequence of operations when implementing the method; in fig. 7 - graphical dependencies of the test results.

The method is carried out as follows.

A single-blade screw stamp 1 with a rod 2 is immersed in the ground at the test mark Z (Fig. 1), the stamp is loaded with an increasing pressing load P up to the final settlement of the stamp (S) equal to 1-2 of its diameters (Fig 2) right under the stamp a deformation zone (hlrf) is formed. Then, the load is gradually relieved and the elastic part of the puddle (S) is measured with the registration of its maximum value with the complete unloading of the punch, and after the unloading of the punch in the ground environment there remains a cavity with a height equal to (Fig. 3). Next, the stamp is moved by unscrewing upwards into the undisturbed soil mass by the value H (Fig. 4), the stamp is reloaded with an increasing pressing load Pj and produced on the cylindrical surface of the soil by moving its dies into the previously formed soil cavity (Fig. 5). This completes one working cycle of testing the soil in order to determine the moduli of deformation and elasticity and the resistance of the soil to shear. The next test cycle is carried out after the first, while the screw stamp is immersed below the Z mark (Fig. 1) by the value (S + h + + H) (Fig. 6).

According to the test results, graphs (Fig. 7) are plotted showing the soil resistance to the stamp displacement during the compressibility test / (graph 1), the elastic displacement of the soil during the unloading of the stamp (graph 2), and the resistance of the soil when tested on the section of the rear sight on a cylindrical surface ( graph 3), which are used to determine, respectively, the moduli of deformation and strength / strength and the strength of the –primer shear.

Using the proposed method of testing soil with a static load will improve the performance of testing single-blade dies by determining several mechanical characteristics of the soil during one test cycle, as well as improving the accuracy of the test due to a slight compaction of the soil around the screw punch when it is screwed.

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Claims (1)

STATIC LOAD TEST METHOD, including immersion of a single-blade stamp with a rod in the ground, loading of the stamp with an increasing pressing load, measuring of the stamp movement in the ground and determination of the mechanical characteristics of the soil, characterized in that, in order to increase the productivity and accuracy of the tests, after stopping the movement of the stamp remove the load, measure the elastic part of the draft of the stamp, move the stamp by unscrewing up into an undisturbed soil mass, re-load the stamp increasing th load going into Lebanon and make the cut _{on the} ground for a cylindrical surface. ®