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A Power Cycle Loading Method Including Periodic Intervals

A power cycle and periodic technology, applied in the direction of applying repeated force/pulsation force to test the strength of materials, can solve the problems of low economy and large safety factor, and achieve the effects of enhanced guidance, reduced damage, and reduced deformation

Active Publication Date: 2020-04-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] 3. The same applies to soil stability
[0008] Generally speaking, the above deviation will cause the soil strength measured by the test to be far lower than the actual soil strength. Therefore, if the continuous vibration test results are used to guide the relevant design, the safety factor will be too large and the economy will be low. The phenomenon

Method used

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  • A Power Cycle Loading Method Including Periodic Intervals
  • A Power Cycle Loading Method Including Periodic Intervals
  • A Power Cycle Loading Method Including Periodic Intervals

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Experimental program
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Embodiment

[0053] In this embodiment, a dynamic triaxial test is performed based on a GDS dynamic triaxial instrument. The power cycle loading method including periodic intervals is described in detail below, and the steps are as follows:

[0054] 1) Determine the data accuracy of the custom vibration curve supported by the triaxial instrument. Under this accuracy, the number of data points that the instrument can support is N. There are 1000 fixed on the GDS moving triaxial, that is, N=1000. And the distribution of data points on the abscissa axis in the instrument must be evenly spaced.

[0055] 2) Determine the unit cycle time T of the target load;

[0056] 3) Determine the cyclic form of the target load, that is, the function curve F(t) of each cycle of the target vibration curve. In the function curve of this embodiment, there is one significant function and one insignificant function respectively, so F(t) is a function about time t, and the expression is as follows:

[0057] ...

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Abstract

The invention discloses a periodic intermittence-containing power cycle loading method. The method comprises the following steps: designing a real load into a vibration curve for test in the manner ofpiecewise function and geometric scale, deriving a function calculating result and then generating a data file; adopting a triaxial instrument capable of self-defining a vibration stress path for imbedding the data file before power load and setting a corresponding cycling parameter; lastly, during the test process, automatically stopping the instrument between vibrations and automatically circular loading, thereby achieving the purpose of simulating real load with intermittence, and automatically recording the soil response during the intermittence process. Compared with the traditional recommendation method, the method disclosed by the invention is simple in operation and higher in efficiency.

Description

technical field [0001] The invention relates to the field of geotechnical dynamic loading, in particular to a dynamic cycle loading method including periodic intervals. Background technique [0002] Indoor dynamic triaxial test is one of the commonly used test methods in the field of geotechnical engineering. After the soil is made into a standard sample suitable for the instrument, the instrument applies a load according to a given stress path, returns and collects the data measured by the sensor, to achieve The purpose of studying the mechanical properties of soil. [0003] At present, most indoor dynamic triaxial test devices have the function of customizing the stress path, such as GDS dynamic triaxial tester, GCTS hollow torsional shear tester, etc. When simulating realistic loads for research, the consistency of the experimental loading conditions with the real situation has a significant impact on the value of the test. [0004] Whether it is studying traffic loads,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32
CPCG01N3/32
Inventor 夏唐代郑晴晴于丙琪周飞何绍衡高敏
Owner ZHEJIANG UNIV
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