A Method for Calculating Poisson's Ratio of Soil

Abstract

The invention discloses a device and a method for measuring and calculating the poisson ratio of a soil body. The device comprises an upper pressing plate, a lower pressing plate and a flexible steel ring, wherein the upper pressing plate is placed on the top of a tested soil column; the lower pressing plate is placed at the bottom of the tested soil column; the flexible steel ring sleeves the outer ring of the tested soil column; the outer side surface of the flexible steel ring is bonded with a sensor I for measuring the horizontal deformation of the soil body; the bottom of the upper pressing plate is provided with a sensor II for measuring the vertical deformation of the soil body. According to the invention, the vertical deformation and the horizontal deformation of the soil body are measured respectively by utilizing two resistance-type displacement meters, thereby calculating the poisson ratio of the soil body; the problem of difficulty in measuring the poisson ratio of the soil body can be solved; the method for measuring the poisson ratio of the soil body is more simple, feasible and accurate than a strain gauge pasting method.

Description

technical field [0001] The invention provides a new method for measuring Poisson's ratio of soil and belongs to the field of civil engineering. Background technique [0002] Poisson's ratio was first discovered and proposed by a French scientist. In his article "Elastic Body Equilibrium and Motion Research Report" published in 1829, he used the theory of intermolecular interaction to derive the motion equation of the elastic body, and found that in the elastic medium Both longitudinal and transverse waves can be propagated, and it is theoretically deduced that when the isotropic elastic rod is stretched longitudinally, the ratio of transverse shrinkage strain to longitudinal elongation strain is a constant. Therefore, within the proportional limit of the material, the absolute value of the ratio of the transverse strain caused by the uniformly distributed longitudinal stress to the corresponding longitudinal strain is called Poisson's ratio. [0003] In the nearly 200-year ...

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Problems solved by technology

[0003] In the nearly 200-year history of Poisson’s ratio, there have been many methods to measure the Poisson’s ratio of materials, and now it is mainly based on the measurement of pasted strain gauges. This method is very accurate in measuring the Poisson’s ratio of elastic bodies, but for some For materials with weak elasticity, it is very difficult to measure by this method, such as soil. When the Poisson’s ratio of the soil is measured by pasting the strain gauge, the soil is easy to crack and deform during the compression of the soil. The strain gauge It is easy to fall off, so that the measurement experiment cannot be carried out normally

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