Geogrid strain measuring device and measuring method in model test

Abstract

The invention discloses a geogrid strain measuring device and a measuring method in a model test. The measuring device comprises a base, a bracket, a stainless steel string, a displacement meter and a measuring system; the bracket is fixedly arranged on the base; the displacement The gauge is set on the support and connected to the measurement system; one or more measuring points are set on the geogrid to be tested, and each measuring point is connected to the displacement gauge through a stainless steel string. The invention has the advantages of simple structure, convenient installation and disassembly, and reusability, which simplifies the strain measurement process of the geogrid, and is especially suitable for the situation of large strain of the geogrid, and satisfies the requirement that there are many measuring points on the geogrid and the measurement along the geogrid Strain measurement requirements when directions overlap.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering model test methods, and relates to a geogrid strain measuring device and a measuring method in model tests. Background technique [0002] Geogrid is a kind of geosynthetic material with unique mesh structure, which has the advantages of high tensile strength, corrosion and aging resistance, good flexibility, convenient production and transportation. Through the friction between the grid surface and the soil and the interlocking and interlocking action of the mesh on the filler particles, the strength and deformation characteristics of the soil can be effectively improved, thereby improving the overall performance and deformation resistance of the grid-reinforced soil structure. , It has been widely used in soft soil foundation treatment, reinforcement protection of steep slopes and embankments, large retaining structures, bridge abutments and roadbed pavement engineering. [0003] As the g...

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Problems solved by technology

[0005] (1) The interlocking and interlocking action between the mesh structure of the geogrid and the filler particles often makes the ribs in a complex state of tension, bending and torsion, so that the results measured by pasting the strain gauges on the grid ribs are not Single tensile strain, especially for the three-way geogrid, the ribs will produce obvious in-plane and out-of-plane deflection, which will distort the measurement results of the strain gauge;

[0006] (2) The range of commonly used resistance strain gauges in China is only about 2%, and the range of special large-range strain gauges can only reach 10%, while the failure strain of plastic geogrids generally exceeds 10%, reaching about 15%. The sheet cannot measure the large strain that occurs when the geogrid is about to fail;

[0007] (3) The sticking process of the strain gauge is complicated, time-consuming and laborious. At the same time, the strain gauge is a consumable and cannot be reused, and it is prone to damage during sample preparation and testing, which affects the acquisition of test data

[0008] The above shortcomings restrict the application of the method of sticking strain gauges in model tests, which is not conducive to deepening the understanding of geogrid deformation characteristics and deformation laws through model tests

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