Wavelet Denoising Analysis of Rock’s Stress-Strain Curve under Uniaxial Compression

2013 ◽  
Vol 368-370 ◽  
pp. 1843-1847
Author(s):  
Li Yu ◽  
Jian Ping Chen ◽  
Wei Zheng
Keyword(s):  
Uniaxial Compression ◽  
Wavelet Packet ◽  
Deformation Modulus ◽  
Strain Curve ◽  
Test System ◽  
Rock Stress ◽  
Wavelet Packet Analysis ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Instantaneous Deformation

Rock stress-strain curve under uniaxial compression is the output of joint action of rock and test system, so it must have certain noise. In order to realize effective denoising processing, the concept of instantaneous deformation modulus has been put forward, and the difference quotient algorithm of instantaneous deformation modulus has been used to enhance noise. After wavelet analysis and wavelet packet analysis of rock stress consequence and instantaneous deformation modulus respectively, the results of different denoising schemes have been statistically analyzed, this analysis shows that the wavelet packet analysis of instantaneous deformation modulus can achieve optimal denoising effect.

scholarly journals Effect of Water Saturation on Stress-Strain Curve of Rocks in Uniaxial Compression

2017 ◽  
Vol 133 (6) ◽  
pp. 107-115 ◽  
Author(s):  
Minami KATAOKA ◽  
Tianshu BAO ◽  
Kimihiro HASHIBA ◽  
Katsunori FUKUI
Keyword(s):  
Uniaxial Compression ◽  
Water Saturation ◽  
Strain Curve ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Effect Of Water

Experimental Research on Deformation Properties of Gangue-Paste Filling Material in Mine

2013 ◽  
Vol 734-737 ◽  
pp. 746-750
Author(s):  
Jun Wei Shi
Keyword(s):  
Mechanical Properties ◽  
Uniaxial Compression ◽  
Triaxial Compression ◽  
Strain Curve ◽  
Filling Material ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Deformation Stage ◽  
Plastic Hardening ◽  
Softening Stage

According to the mechanical properties of paste filling body under special environment such as high temperature high humidity high stress and high airtight) in gob, mechanical properties of gangue-paste filling body was studied with the method of field core and laboratory test. The complete stress-strain curve of filling body under the condition of uniaxial and triaxial and the ultimate compressive strength under different confining pressure station were obtained through uniaxial and triaxial compression test. Six stages of uniaxial compression complete stress-strain curve (compression stage, elastic deformation stage, non-stable developing stages, plastic hardening stage, stress softening stage and residual deformation stage) were improved and developed. The deformation characteristics of filling body under triaxial compression were different from that under uniaxial compression. Namely the deformation of filling body under triaxial compression only appeared two deformation stages: linear deformation stage and plastic hardening stage, but had no softening stage basically under different confining pressures, which was benefit for controlling the ground subsidence and preventing the ground buildings.

Experimental Equipment Research on Uniaxial Compression Stress-Strain Curve of Concrete

2010 ◽  
Vol 163-167 ◽  
pp. 1333-1338
Author(s):  
Hai Bin Chen ◽  
You Po Su ◽  
Yu Min Zhang ◽  
Li Na Wang
Keyword(s):  
Structural Analysis ◽  
Strain Rate ◽  
Uniaxial Compression ◽  
Theoretical Basis ◽  
Indirect Method ◽  
Strain Curve ◽  
Experimental Equipment ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Loading System

The constitutive relation of concrete under uniaxial compression is the essential theoretical basis for structural analysis of concrete. Because of lack of sufficient stiffness for ordinarily tester, stable falling branch of stress-strain curve cannot be obtained. The common methods to increase rigidity of loading system include direct and indirect method. The condition of realizing the stress-strain complete curve for concrete uniaxial compression is derived. A set of stiffness experimental equipment is designed by using the indirect method, which has the advantages of simple, dependable and strong adaptability. Experiment shows that stress-strain complete curve of uniaxial compression under different strain rate could be achieved by using this equipment and electro-hydraulic loading system of MTS co. ltd. It will lay foundation for putting forward the stress-strain curve equation of uniaxial tension and compression under considering the effect of strain rate. It can provide theoretical basis for structural analysis of concrete.

Experimental Study on Mechanical Characteristics of Deformation of Red Sandstone

2011 ◽  
Vol 261-263 ◽  
pp. 1234-1238
Author(s):  
Rui Hong Wang ◽  
Yu Zhou Jiang ◽  
Jing Guo ◽  
Shi Yi Wen
Keyword(s):  
Rock Mass ◽  
Elastic Modulus ◽  
Mechanical Characteristics ◽  
Deformation Modulus ◽  
Strain Curve ◽  
Confining Pressure ◽  
Peak Strain ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Red Sandstone

For geotechnical engineering, it has great significance to research the mechanical characteristics of rock mass under three dimensional stresses. Through triaxial compression failure test, the characteristics of stress-strain curve and deformation of red sandstone from Sichuan under different confining pressures has been analyzed. The results show that: with the increment of confining pressure, the failure mode of rock mass changes from brittle failure to ductile failure gradually, and an obvious yield platform appears near the peak strength of stress-strain curve; the elastic modulus, deformation modulus, peak strain and residual strain of rock sample increase with the increment of confining pressure, the elastic modulus and deformation modulus are not a fixed value, and the relation between deformation parameter and confining pressure can be fit through quadratic curve.

scholarly journals Proposed Constitutive Law of Uniaxial Compression for Concrete under Deterioration Effects

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2048 ◽  
Author(s):  
Yiwei Gao ◽  
Xuhua Ren ◽  
Jixun Zhang ◽  
Lingwei Zhong ◽  
Shuyang Yu ◽  
...  
Keyword(s):  
Uniaxial Compression ◽  
Failure Process ◽  
Strain Curve ◽  
Ductile Deformation ◽  
Deformation Capacity ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
New Model ◽  
Freeze Thaw ◽  
Prediction Curve

In order to study the ductile deformation characteristics and failure process of plain concrete under uniaxial compression, this paper proposes a new constitutive model. The new model was used to fit and analyze the constitutive curve of concrete under uniaxial compressive under various degradation forms and was compared with the traditional constitutive models. Finally, the new model was used to quantitatively analyze and predict the stress–strain curve of concrete in different degradation periods of a set of freeze–thaw measured data. The results show that, compared with the traditional constitutive model, the new model is simple in form and has few parameters, and the numerical value of the parameter can reflect the ductile deformation capacity of concrete. The fitting curve of the new model has the highest fitting degree with the measured stress–strain curve of concrete, and the goodness of fit (R2) is also the largest. The new model is suitable for fitting the stress–strain curve of concrete under uniaxial compression under various deteriorating forms, and the degree of fit between the constitutive prediction curve and the measured curve is high. It can be seen from the fitting results of the new model parameters that the ductile deformation capacity of concrete decreases first and then increases slightly, which is inconsistent with the law of gradual deterioration of strength. There is a minimum moment of ductility deformation capacity of concrete (MDC). The MDC of O-C40 concrete is about 114 freeze–thaw cycles, and the MDC of O-C50 concrete is about 116 freeze–thaw cycles; the degree of fit between the constitutive prediction curve and the measured curve is high. We hope that the improvement mentioned offers valid reference to the study of ductile deformation characteristics and failure process of compressed concrete under different deterioration forms.

Numerical Simulation of Marine Recycled Concrete Specimen Based on ABAQUS

2012 ◽  
Vol 482-484 ◽  
pp. 621-626
Author(s):  
Wen Bai Liu ◽  
Wang Nan Chen ◽  
Xia Li
Keyword(s):  
Numerical Simulation ◽  
Uniaxial Compression ◽  
Sea Water ◽  
Strain Curve ◽  
Concrete Specimen ◽  
Water Erosion ◽  
Recycled Concrete ◽  
Experimental Results ◽  
Stress Strain Curve ◽  
Stress Strain

Based on ABAQUS, this article builds up a dispersion cracking model and carries out the numerical simulation of the influence of sea water erosion depth and intension upon marine recycled concrete specimen. Compared with stress-strain curve from the experiment, it can be easily found that the experimental results match well with that of simulation through the numerical simulation of uniaxial compression on average concrete, recycled concrete corroded by seawater and the same concrete after vacuum pumping, which shows two kinds of curves stay close to each other. From the results of the simulation, strain develops from the edges to the middle of the cube until it runs through the whole section, which basically corresponds with the outcome observed in the experiment.

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