Analog semi-rigid underlying structure temperature shrinkage fracture testing method and device

Abstract

The invention discloses an analog semi-rigid underlying structure temperature shrinkage fracture testing method and a device. The device mainly consists of a bracket, a gripping head, a screw rod, positioning bolts and a force sensor, and the selected materials of an analog test piece are organic glass plate and rubber tire. The testing method comprises the following steps: fixing a test piece pasted with a strain disc on the device through the gripping head, then placing in a temperature control test box, and connecting the strain disc and a strain box through a conducting wire which penetrates through the test box; turning the positioning bolts to apply a tensile force to the test piece through the control of the force sensor, and realizing the purpose of applying the tensile force to the test piece; and while applying the tensile force to the test piece, ensuring that the test piece and the gripping head are in the same plane, and fixing the test piece through a fastening bolt and the screw rod, so as to ensure that the test piece does not generate torsion. The method provided by the invention can simulate the fracture condition generated by fracture of a semi-rigid underlying structure after the action of temperature and load, and provides an effective way for research of underlying structure indoor analog and the fracture condition under the condition of temperature variation; and the structure is simple, the operation is convenient and the effect is good.

Description

technical field [0001] The invention relates to a simulation test method and device for subgrade pavement structures affected by environmental factors, in particular to a test method and device for simulating temperature shrinkage fracture of a semi-rigid base structure. Background technique [0002] In the process of expressway construction, more and more semi-rigid base structures are used. However, the reflection cracks frequently appear in this semi-rigid base are quite serious, which seriously affects the service condition and life of the road. In seasonally frozen regions or permafrost regions, the temperature shrinkage cracks are especially common and serious. The most notable feature of the semi-rigid base structure is its temperature shrinkage performance. At present, the temperature shrinkage performance test of semi-rigid base materials is almost always made of standard beam-type specimens. After curing, stick strain gauges and then put them into controllable In ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a test method and device for simulating the temperature shrinkage fracture of a semi-rigid base structure, which solves the problem that the previous test method has a large workload and cannot simulate the actual boundary conditions of the base

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