Method and device for mechanical parameter test on granular aggregate roadbed
A technology of mechanical parameters and test methods, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problem that the wheel-aggregate subsidence characteristics cannot be simulated, and achieve the effect of improving accuracy
Inactive Publication Date: 2013-10-09
FUZHOU UNIV
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Problems solved by technology
However, the application of it to evaluate the pressure-bearing characteristics of bulk aggregates on the road bed of emergency vehicles has certain limitations, and it is impossible to simulate the subsidence characteristics of on-site wheel-aggregate
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[0021] Such as Figure 1~4 As shown, a method for testing the mechanical parameters of a bulk aggregate road bed includes the following steps: (1) Put the aggregate 1 into the aggregate box 2 according to the requirements of the corresponding particle size and thickness and level it; (2) According to The test working condition arranges that the wheel set 3 is placed in the center of the aggregate pile, and after alignment, an oil hydraulic jack 5 is installed between the wheel set 3 and the steel beam 4; The center of group 3 is loaded step by step, and after the subsidence is stable, observe and record the subsidence of wheel group 3 under the loads of each level; (4) load until the subsidence under a certain level of load does not change or cannot continue to be loaded, unload, and proceed to the next step. A set of trials.
[0022] In this embodiment, the size of the collection box 2 in step (1) (length×width×height) is 1.5m×1.5m×1m, and the collection box 2 is to accumula...
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Abstract
The invention relates to a method for a mechanical parameter test on a granular aggregate roadbed. The method comprises the following steps of 1, putting an aggregate into an aggregate tank according to corresponding particle size and thickness requirements, and carrying out leveling, 2, putting a wheel group in the center of the aggregate pile according to test condition arrangement, carrying out aligning, and installing an oil jack between the wheel group and a steel beam, 3, carrying out a test by carrying out prepressurization, carrying out step-by-step loading on the center of the wheel group and observing and recording sinkage of the wheel group under the action of all grades of loads after sinkage is stable, and 4, carrying out loading until the sinkage cannot be changed under a certain grade of the load or until the loading process cannot be continued, carrying out unloading and carrying out the next test. The method utilizes the aggregate tank and a load counter-force application device to research a relationship between vehicle wheel sinkage and roadbed aggregate design parameters, improves accuracy of laboratory research on sinkage characteristics of an emergency lane roadbed granular-aggregate, and provides data support for selection of design parameters of an emergency lane roadbed aggregate.
Description
technical field [0001] The invention relates to a method and a device for testing the mechanical parameters of a bulk aggregate road bed. Background technique [0002] In recent years, with the significant increase of highway traffic volume and truck weight, traffic safety problems on long downhill sections of mountainous highways have become increasingly prominent. Setting up the avoidance lane is one of the effective engineering measures to solve the traffic safety problem of the long downhill section of the mountainous highway. The road bed aggregates of the emergency vehicle are mainly natural gravel aggregates. At present, the Bayesian test is mainly used to study the pressure-bearing characteristics of the aggregates, that is, the pressure plate subsidence test to measure the relationship between the vertical load and the subsidence. However, the application of it to evaluate the pressure-bearing characteristics of granular aggregates on the road bed of emergency vehi...
Claims
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IPC IPC(8): G01N3/12
Inventor 胡昌斌黄金龙
Owner FUZHOU UNIV