scholarly journals ANALYSIS OF EXPERIMENTAL DATA OF TESTING OF SOILS BY THE METHOD OF THREE-AXIAL COMPRESSION

2021 ◽  
Vol 9 (4) ◽  
pp. 21-25
Author(s):  
Oksana Osipova ◽  
Yuliya Matvienko
Keyword(s):  
Experimental Data ◽  
Axial Compression ◽  
Structural Strength ◽  
Triaxial Compression ◽  
Soil Testing ◽  
Compression Device

The article analyzes the data obtained during soil testing in the ASIS-1 measuring and computational complex, the GT 1.3.1-05 triaxial compression device, conclusions are drawn about the possibility of determining the structural strength of soils in this device, graphic results are analyzed, and conclusions are drawn.

A New Method to Assess Ductility of CFT Box Columns with Binding Bars under Axial Compression

2012 ◽  
Vol 446-449 ◽  
pp. 78-81 ◽  
Author(s):  
Yue Ling Long ◽  
Jian Cai
Keyword(s):  
Experimental Data ◽  
Axial Compression ◽  
Material Properties ◽  
New Method ◽  
Box Columns ◽  
Good Agreement

A new method based on material properties instead of experimental data was proposed to assess the ductility of concrete-filled steel box columns with binding bars and those without binding bars. Comparison between ductility coefficients based on experimental data and the calculated values by the proposed method shows good agreement.

Investigate on Axial Load Behaviors of T-Shaped CFT Stub Columns with Binding Bars

2014 ◽  
Vol 501-504 ◽  
pp. 510-513
Author(s):  
Xin Zhi Zheng ◽  
Xin Hua Zheng
Keyword(s):  
Experimental Data ◽  
Bearing Capacity ◽  
Ultimate Strength ◽  
Failure Mode ◽  
Axial Compression ◽  
Axial Load ◽  
Constitutive Relationship ◽  
Relationship Of ◽  
Stub Columns

. Abstract. Tests on TCFT-WB, including 11 specimens with binding bars and 5 without binding bars under axial compression were carried out. The effects of parameters on the behavior of specimens such as failure mode, bearing capacity and ductility are analyzed to provide experimental data for the following research. The formula to calculate ultimate strength of TCFT-WB columns under axial compression are deduced from the constitutive relationship of TCFT-WB. The calculated results are compared with those calculated by FEM analyses, showing the proposed formula can give reasonable predictions on the ultimate strength of TCFT-WB stub columns under axial compression.

scholarly journals X-Ray Microtomography (μCT) as a Useful Tool for Visualization and Interpretation of Shear Strength Test Results

2015 ◽  
Vol 36 (4) ◽  
pp. 47-55 ◽  
Author(s):  
Damian Stefaniuk ◽  
Matylda Tankiewicz ◽  
Joanna Stróżyk
Keyword(s):  
Shear Strength ◽  
Shear Failure ◽  
Triaxial Compression ◽  
Soil Testing ◽  
Geometrical Parameters ◽  
Clayey Soils ◽  
Test Results ◽  
Strength Parameters ◽  
X Ray ◽  
Method Of Evaluation

Abstract The paper demonstrates the applicability of X-ray microtomography (ìCT) to analysis of the results of shear strength examinations of clayey soils. The method of X-ray three-dimensional imaging offers new possibilities in soil testing. The work focuses on a non-destructive method of evaluation of specimen quality used in shear tests and mechanical behavior of soil. The paper presents the results of examination of 4 selected clayey soils. Specimens prepared for the triaxial test have been scanned using ìCT before and after the triaxial compression tests. The shear strength parameters of the soils have been estimated. Changes in soil structure caused by compression and shear failure have been presented as visualizations of the samples tested. This allowed for improved interpretation and evaluation of soil strength parameters and recognition of pre-existing fissures and the exact mode of failure. Basic geometrical parameters have been determined for selected cross-sections of specimens after failure. The test results indicate the utility of the method applied in soil testing.

scholarly journals A Parabolic Failure Criterion for Transversely Isotropic Rock: Modification and Verification

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Ding-Jian Wang ◽  
Huiming Tang ◽  
Peiwu Shen ◽  
Yi Cai
Keyword(s):  
Experimental Data ◽  
Failure Criterion ◽  
Triaxial Compression ◽  
Transversely Isotropic ◽  
Confining Pressure ◽  
Prediction Errors ◽  
Compression Tests ◽  
Predictive Capacity ◽  
Data Set ◽  
Transversely Isotropic Rock

It is of great significance to develop a failure criterion that can describe the orientation-dependent behavior of transversely isotropic rocks. This paper presents a simplified parabolic model that is successful in predicting the strengths of rocks under different confining pressures and bedding angles. The model is a modified version of the normal parabolic criterion for intact rocks. The two orientation-dependent parameters (σcβ and kβ) in the model show trigonometric relationships with the bedding angle, and they can be readily determined through uniaxial and triaxial compression tests. The shape of the failure envelope is determined by kβ, and σcβ only affects the level of rock strength. With application to 446 experimental data, the predicting results by the parabolic criterion are highly consistent with the experimental data, and the predictive capacity of the proposed criterion is better than those of the McLamore-Gray and Tien-Kuo criteria. Besides, the prediction errors for the high confining pressure condition and the bedding-sliding failure mode are smaller than those for the low confining pressure and the non-bedding-sliding failure. Moreover, the prediction error almost remains steady with the decrease of data set, indicating that the proposed criterion is of high precision even if the experimental data are limited.

Interpretation of soil tests: a review

1993 ◽  
Vol 33 (8) ◽  
pp. 1045 ◽  
Author(s):  
G Blair ◽  
R Lefroy
Keyword(s):  
Experimental Data ◽  
Expert Systems ◽  
Quantitative Measure ◽  
Climatic Conditions ◽  
Soil Testing ◽  
Final Decision ◽  
Soil Tests ◽  
Financial Situation ◽  
The Poor ◽  
Accurate Interpretation

Soil tests tell how much nutrient is extractable, some of which may be present in a plant-available form, and/or the amount that may become available to the crop or pasture. This is a quantitative measure of nutrients. Interpretation depends on the skill of interpreters, and a major factor in interpretation is experience. Accurate interpretation is only possible when the sample collected from the field is representative of the site, and this can best be achieved using monitor plots rather than the traditional zig-zag method of sampling. One of the main deficiencies in experimental data used to interpret soil tests is the poor characterisation of experimental sites and of the climatic conditions during the experiment. Better characterisation would allow better interpretations to be made. With the development of equipment that is able to analyse multiple elements (e.g. ICP-AES), investigation of multiple extractants should be expanded in Australia. Of these, the Mehlich No. 3 and AB-DTPA extractants would seem the most appropriate. Because of the frequent relocation of agriculture advisers, experience is often lost; hence, there is a need for GIS/Expert systems to gather this experience. The development of such systems will allow new personnel to understand more rapidly the characteristics of soils, climate, and crops in an area. The final decision on fertiliser rates depends on the financial situation of the farmer. Soil testing and interpretation of these results is just 1 factor used to make the fertiliser decision.

scholarly journals Modelling of the Response of Partially Saturated Non-cohesive Soil Subjected to Undrained Loading

2018 ◽  
Vol 65 (1) ◽  
pp. 11-29
Author(s):  
Waldemar Świdziński ◽  
Jacek Mierczyński ◽  
Marcin Smyczyński
Keyword(s):  
Experimental Data ◽  
Triaxial Compression ◽  
Cohesive Soil ◽  
Original Model ◽  
Saturated Soils ◽  
Cohesive Soils ◽  
Partially Saturated ◽  
Partially Saturated Soils ◽  
Undrained Conditions ◽  
Undrained Loading

AbstractThe paper deals with the modelling of the undrained response of non-cohesive partially saturated soils subjected to triaxial compression. The model proposed is based on an incremental equation describing the pre-failure response of non-cohesive soils during shearing. The original model, developed by Sawicki, was modified by taking into account pore fluid compressibility. The governing equation makes it possible to simulate effective stress paths under undrained conditions. Numerical results are compared with experimental data.

scholarly journals Comparative analysis of experimental data of testing heavy concrete with simulation results

2021 ◽  
Vol 18 (1) ◽  
pp. 53-59
Author(s):  
S. V. Tsvetkov ◽  
Keyword(s):  
Experimental Data ◽  
Comparative Analysis ◽  
Uniaxial Compression ◽  
Axial Compression ◽  
Numerical Study ◽  
Biaxial Compression ◽  
Short Term ◽  
Simulation Results ◽  
Comparison Of The Results

The article presents the results of comparison of experimental data of testing heavy concrete with the simulation results. There were studied data on the strength of concrete under short-term uniaxial compression, biaxial compression, compression with tension, and triaxial proportional compression. The model uses the characteristics obtained from the results of testing concrete under axial compression. Comparison of the results of numerical study and the testing results has shown a satisfactory convergence.

Axial load—dependent cervical spinal alterations during simulated upright posture: a comparison of healthy controls and patients with cervical degenerative disease

2005 ◽  
Vol 2 (2) ◽  
pp. 137-144 ◽  
Author(s):  
Shinji Kimura ◽  
John R. Hesselink ◽  
Steven R. Garfin ◽  
Yoichi Kawaji ◽  
Kazuhiro Hasegawa ◽  
...  
Keyword(s):  
Cervical Spine ◽  
Axial Compression ◽  
Axial Load ◽  
Upright Posture ◽  
Disc Disease ◽  
Cross Sectional ◽  
Content Type ◽  
Compression Device ◽  
Dural Sac ◽  
Fine Print

Object. The objectives of this study were to simulate the upright loading condition in the cervical spine by applying a new compression device during supine posture and to assess intervertebral angles and cross-sectional areas of the spinal cord and dural tube before and during axial compression. Methods. A magnetic resonance (MR) imaging-compatible device was developed to create axial compression with the patient in the supine position. Lateral radiographs were obtained in upright and supine positions with an axial load of 0% (supine) and by applying a cervical compression device at 7, 10, and 13% of body weight (BW) in 18 control individuals and seven symptomatic patients with cervical degenerative disc disease (DDD). Additionally, cervical MR images acquired in 17 controls and 12 patients were compared before and during an axial load of 8.4% BW in terms of anteroposterior diameter and cross-sectional area of the dural sac. The supine intervertebral angles with loads of 0, 7, 10, and 13% of the individuals' BW relative to upright posture were −8.1 ± 1.3, −2.3 ± 1.4, 1.3 ± 1.9, and 2.8 ± 2°, respectively. Subsequent axial force was interpolated as 8.9% of BW to simulate upright cervical spine alignment. Under an axial loading similar to that created by the upright posture, the dural sac narrowed at the C5–6 interspace in asymptomatic individuals and at the C6–7 interspace in patients with cervical DDD. Conclusions. This cervical compression device may be a useful tool to simulate upright cervical spinal alignment. The results of this study help in understanding the pathophysiology of symptoms related to cervical degenerative disorders in upright posture.

scholarly journals Accounting for the Scale Factor in Determining the Compressed Concrete Strength of Concrete-Filled Steel Tube Elements

2019 ◽  
Vol 278 ◽  
pp. 03003
Author(s):  
Elvira P. Chernyshova ◽  
Vladislav E. Chernyshov
Keyword(s):  
Experimental Data ◽  
Axial Compression ◽  
Cross Section ◽  
Concrete Strength ◽  
Circular Cross Section ◽  
Steel Tube ◽  
Scale Factor ◽  
Concrete Filled Steel Tube ◽  
New Formula

The published experimental data on the influence of the concrete samples dimensions on their strength under axial compression had been analyzed in the article. The mechanism of this influence is revealed from the positions of strength statistical theories. The known dependences are given and a new formula is proposed for taking into account the scale factor in determining the strength of compressed concrete. An algorithm for calculating the strength of centrally compressed concrete-filled steel tube elements (CFSTE) with a circular cross-section taking into account the scale factor is shown.

Estimation of the Collapse Loads of Thin-Walled Cylinders in Axial Compression

1979 ◽  
Vol 46 (2) ◽  
pp. 381-385 ◽  
Author(s):  
C. G. Foster
Keyword(s):  
Experimental Data ◽  
Axial Compression ◽  
Excellent Agreement ◽  
Critical Loads ◽  
Buckling Load ◽  
Space Frame ◽  
Compression Members ◽  
Thin Walled

By considering the Yoshimura pattern obtained in buckling thin-walled cylinders as a space frame and calculating the collapse loads of the compression members the critical loads of a buckling cylinder can be estimated. Excellent agreement has been obtained with one set of published experimental data in establishing both the postbuckling critical loads and the initial buckling load.

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