Broken stone railway ballast direct-shear testing apparatus

Abstract

The invention discloses a broken stone railway ballast direct-shear testing apparatus, which belongs to the technical field of examination and testing tools. The broken stone railway ballast direct-shear testing apparatus solves the problems that a shearing area is continuously changed due to a same size of an upper case and a lower case while testing, so that the direct-shear testing error is large. The test case comprises a frame body, the lower case arranged at a frame body, and the upper case arranged at the lower case, the upper case and the lower case generate relative movement, a lengthof an inner chamber of the lower case is greater than the length of the inner chamber of the upper case , the length of the inner chamber of the lower case is set to the length greater than the sizeof the inner chamber of the upper case, during relative movement of the upper case and the lower case, an overlap area between the upper case and the lower case in a long time (which is a shearing area) is same with the area of the inner chamber of the upper case, so that the shearing area cannot be continuously changed with the increase of horizontal displacement, direct-shear test error due to change of the shearing area is eliminated or reduced, and the direct-shear test accuracy is increased.

Description

technical field [0001] The invention belongs to the technical field of inspection and test tools, and relates to a test box for crushed stone ballast, in particular to a test box for railway crushed stone ballast shear test. Background technique [0002] Ballasted track is the most important track structure form of my country's railways. As of the end of 2017, the operating mileage of China's railways reached 127,000 kilometers, of which the operating mileage of normal-speed railways and heavy-haul railways with ballasted track lines accounting for more than 99% was 102,000 kilometers. There are ballast tracks. The gravel bed in the ballasted track is composed of graded gravel, its mechanical properties and service status directly affect the safe operation and daily maintenance of the railway. Railway operation practice shows that more than 75% of the maintenance and repair work on the ballasted track is Developed for the gravel track bed. Therefore, mastering the mechani...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a crushed stone ballast direct shear tester in order to solve the large error of the direct shear test results caused by the constant change of the shear area caused by the same size of the upper and lower boxes during the test of the existing direct shear instrument

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