Testing device for simulating mechanical behaviors of gravel soil subgrade under reciprocating traffic moving load

Abstract

The invention relates to a testing device for simulating mechanical behaviors of a gravel soil subgrade under reciprocating traffic moving load. The device comprises a peripheral framework, a test sample box, an axial loading unit, a horizontal loading system and a data acquisition system, wherein the test sample box is arranged in the peripheral framework, a gravel soil subgrade test sample is filled in the test sample box, a road slab is paved above the gravel soil subgrade test sample, the axial loading unit comprises a trundle and a hydraulic loading system, the trundle is arranged on the road slab, the hydraulic loading system applies an axial pressure to the trundle, the horizontal loading system maintains the horizontal reciprocating movement of the trundle, and the data acquisition system is arranged at the four corners of the side wall of the test sample box. Compared with the prior art, the device disclosed by the invention can simulate the mechanical behaviors of the gravel soil subgrade under the reciprocating traffic moving load to obtain the relationship between gravel soil subgrade deformation settlement and parameters of loading time, loading frequency, axial load and the like, thereby reasonably guiding the engineering practice of road engineering construction and ensuring the stability of the gravel soil subgrade.

Description

technical field [0001] The invention relates to a device for studying the mechanical behavior of gravel-soil subgrades, in particular to a test device for simulating the mechanical behavior of gravel-soil subgrades under reciprocating traffic moving loads, which is applicable to the fields of subgrade engineering such as airport runways, railways and highways. Background technique [0002] With the rapid growth of air traffic volume and the proportion of large wide-body aircraft, some of the early-built airport runways in my country have serious subgrade settlement of gravel and soil under the runway, and the performance has declined sharply. performance and prolong service life; the traditional cyclic triaxial tester cannot realize the test simulation of load movement, and the obtained cyclic triaxial path is fundamentally different from the real site circulation path, so it cannot objectively reveal the gravel soil subgrade during the road operation period The stable state a...

AI Technical Summary

Problems solved by technology

[0003] Under the dynamic load of long-term reciprocating traffic, the direction and magnitude of the stress axis of the gravel soil subgrade are coupled and changed. There are many theoretical difficulties in the deformation law of the gravel soil subgrade under this complex dynamic load and the mechanical mechanism it depends on. The settlement prediction theory is not yet perfect, and the calculation accuracy is low, which cannot meet the engineering needs

The gravel soil subgrade is a relatively common form of airport foundation. The research on its mechanical properties under the action of cyclic traffic load is not sufficient at home and abroad, and the experimental research on the deformation and settlement of the airport gravel soil subgrade is basically in a blank state.

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