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Transformation Method of Triaxial Creep Test Result of Rock and Soil by Staged Loading to Separate Loading

A graded loading, triaxial creep technology, applied in the direction of using stable tension/pressure to test the strength of materials, analyze materials, instruments, etc., can solve the problems of many test conditions, determine the time interval, etc. Workload, the effect of reducing rigid requirements

Active Publication Date: 2022-05-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that there are many test conditions that need to be met, the application time of each load level must be consistent, and the creep deformation rate under this load level must be kept close to 0 before the next level of loading can be carried out.
During a large number of rock and soil triaxial creep tests, as the number of loading stages increases, the time for each stage of sample to reach creep stability is longer. Usually, researchers regard deformation less than a certain rate such as 0.01mm / d as The criteria for judging entry into the next level of testing, therefore, it is difficult to determine the time interval at the beginning of the testing

Method used

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  • Transformation Method of Triaxial Creep Test Result of Rock and Soil by Staged Loading to Separate Loading
  • Transformation Method of Triaxial Creep Test Result of Rock and Soil by Staged Loading to Separate Loading
  • Transformation Method of Triaxial Creep Test Result of Rock and Soil by Staged Loading to Separate Loading

Examples

Experimental program
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Effect test

Embodiment 1

[0163] The transformation of the entire curve is relatively large, and the "transformation" is performed only for the deformation-time point when the stability criterion is reached for the first time under each level of loading during step-by-step loading.

[0164] The data of this embodiment is taken from the deformation curve of a creep test under graded loading of a sample numbered 14 in a series of triaxial creep tests, such as image 3 As shown, the physical indicators of the triaxial sample: silty clay, uniform gradation, sample initial size d0=61.615mm, h0=122.240mm, unsaturated soil sample, moisture content 22.38%, maximum dry density 1.55g / cm 3 , the degree of compaction is 0.95. The test condition is preset as the confining pressure 200kPa, the number of loading stages n=11, and the accumulated stepped axial pressure load value is as follows Figure 4 As shown, there is no consolidation and no drainage. During the test, the fluctuation of ambient temperature and h...

Embodiment 2

[0192] with F 1 +F 2 Take the transformation from hierarchical loading to separate loading as an example.

[0193] Extend the "equal external force work in the whole process of loading from two different ways" to "equal external force work at each moment inside the loading process". The method of applying external force work equality:

[0194]

[0195]

[0196] The calculation process can be realized by using EXCEL, and a series of a, b, c, d, e coefficients of standard one-dimensional quartic equations corresponding to different total axial loads at different loading times can be obtained, and these equations can be solved to obtain the ξ value, Choose the correct value of ξ, and then solve a series of l' i value. Figure 5 F for using EXCEL 1 +F 2 The conversion calculation results of the hierarchical loading to the separate loading. Figure 6 It is the final creep vertical deformation curve cluster of No. 14 sample transformed from staged loading to separate lo...

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Abstract

The invention discloses a method for transforming the results of a hierarchically loaded geotechnical and soil triaxial creep test to separate loading. The total energy input to the axial specimen is made equal to the external input total energy of the two loading methods, and the equation about the creep deformation of the specimen is established. According to the creep deformation data of hierarchical loading, the initial size of the specimen and its external conditions are synthesized , solve the creep deformation of the specimen under separate loading, and draw the creep deformation-time curve under separate loading in combination with the test time corresponding to each equation. The present invention considers the influence of nonlinear deformation during the transformation of the two loading modes from the perspective of energy, so that the transformation process has a clearer physical and mechanical meaning, reasonably considers the nonlinear factors of deformation, and analyzes the possibility of hidden potential hidden dangers of rock and soil creep through hierarchical loading. It provides a new idea for a reasonable and accurate study of rock and soil creep.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and relates to a method for analyzing and processing the data of triaxial creep test results of rock and soil, in particular to a method for triaxial vertical creep deformation of rock and soil samples obtained by staged loading A processing method for transforming data into vertical creep deformation data obtained by separate loading. Background technique [0002] The basic subject of rheology is to study the law of stress-strain state and its change with time, and to solve problems related to rheology encountered in engineering practice according to the established constitutive law. [0003] In the indoor rheological test of soil, there are two ways of loading separately and stepwise loading. Theoretically speaking, separate loading can better meet the conditions required by the rheological test, and the whole rheological curve of the soil can be obtained directly. However, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0071G01N2203/0075G01N2203/0256
Inventor 汤爱平渠海港朱世界
Owner HARBIN INST OF TECH
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