scholarly journals Correlation between Acoustic Emission Behaviour and Dynamics Model during Three-Stage Deformation Process of Soil Landslide

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2373
Author(s):  
Lizheng Deng ◽  
Hongyong Yuan ◽  
Jianguo Chen ◽  
Zhanhui Sun ◽  
Ming Fu ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Model Test ◽  
Deformation Process ◽  
Development Process ◽  
Sudden Change ◽  
Characteristic Parameter ◽  
Physical Analysis ◽  
Soil Slope ◽  
Dynamics Model ◽  
Inverse Velocity

Acoustic emission (AE) monitoring has become an optional technology to quantify slope deformation. However, there are still challenges in developing generic AE interpretation strategies. Dynamics and kinematics models are two physical methods for analysing slope stability, which appear to improve the interpretability of AE monitoring data. The aim of this study is to explore the change patterns and interrelations of dynamics, kinematics, and AE measurements using a model test and physical analysis, to further understand the development process of a progressive landslide. A model test is designed based on the kinematics model of landslide three-stage deformation. An equation between factor of safety (FoS) and thrust is proposed based on the mechanical model of a landslide test. There is a clear correspondence between the displacement and inverse velocity during the deformation-controlled process. Relationships are uncovered between the thrust and FoS as well as the thrust and acceleration. As a characteristic parameter of AE, ring down count (RDC) is able to quantify the deformation process of the soil slope. Moreover, acceleration and RDC can reflect the sudden change of the slope state and, hence, can be effective indicators for the early warning in a progressive landslide.

Mechanical Characteristics of Soil Anchor under Combined Water and Ground Loads

2011 ◽  
Vol 243-249 ◽  
pp. 2915-2919
Author(s):  
Jian Bin Hao ◽  
Yu Ming Men
Keyword(s):  
Stress State ◽  
Model Test ◽  
Mechanical Characteristics ◽  
Axial Strain ◽  
External Factors ◽  
Soil Slope ◽  
Additional Load ◽  
Anchor System ◽  
State Of Tension ◽  
Ground Load

Gradually, anchor is in the working state of tension, but its stress becomes rather complicated when influenced by some external factors such as water, ground loads, etc. Aiming at the problems that ground additional load or coupling action of water and the additional load are forced on soil slope, the axial strain distributions of anchor tendons were obtained by model test. The change rules of axial strain at anchor head, near to slip plane, and end of the anchorage were analyzed respectively. The results show that under ground loads, the strain of anchor is biggest at the anchor head, and it gradually decreases from outer to inner. Under combined water and ground load, the stress state of the anchor system changes from tension to bending, and the upper anchors are most urgently affected. The experimental results can supply a reference for design and research of soil anchor with similar conditions.

Experimental investigation on progressive deformation of soil slope using acoustic emission monitoring

2019 ◽  
Vol 261 ◽  
pp. 105295 ◽  
Author(s):  
Lizheng Deng ◽  
Hongyong Yuan ◽  
Jianguo Chen ◽  
Zhanhui Sun ◽  
Ming Fu ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Acoustic Emission ◽  
Soil Slope ◽  
Progressive Deformation ◽  
Acoustic Emission Monitoring ◽  
Emission Monitoring

The Acoustic Emission Diagnose and Analysis of Journal Bearing‘s Inner Ring Looseness Fault by Truck Wheel

2011 ◽  
Vol 130-134 ◽  
pp. 54-57
Author(s):  
Hai Chao Cai ◽  
Dong Feng Wang ◽  
Qiao Yu Xu ◽  
Zhen Dong Shang
Keyword(s):  
Acoustic Emission ◽  
Wavelet Packet ◽  
Characteristic Parameter ◽  
Present Condition ◽  
Acoustic Emission Technique ◽  
Railway Freight ◽  
Freight Car ◽  
Dynamic Loading Conditions ◽  
Emission Detection ◽  
Railway Freight Car

In this paper, we combine the characteristics of acoustic emission detection with the present condition of truck rolling bearing’s fault detection ,adopting the acoustic emission technique to examine railway freight car ’s journal bearing inner ring looseness .We put forward the method which wavelet packet analyze and withdraw bearing acoustic emission signal’s feature vector. Through the energy distribution comparison of inner ring’s non-looseness and looseness, we extract the ratio between high frequency’s internal energy and total energy as the characteristic parameter , which can recognize the inner ring’s loose fault effectively. Acoustic emission technique is a dynamic detection method, which can get materials’ important information,fatigue crack propagation,under the dynamic loading conditions. In comparison with the traditional vibration detection, it has the characteristics of the early prediction of bearing fault.

scholarly journals A novel acoustic emission parameter for predicting rock failure during Brazilian test based on cepstrum analysis

2020 ◽  
Vol 192 ◽  
pp. 01004
Author(s):  
Honglei Wang ◽  
Zhenlei Li ◽  
Xueqiu He ◽  
Dazhao Song ◽  
Haifeng Guo
Keyword(s):  
Acoustic Emission ◽  
Correlation Coefficients ◽  
Characteristic Parameter ◽  
Tensile Failure ◽  
Linear Change ◽  
Rock Stability ◽  
Full Waveform ◽  
Emission Parameter ◽  
Ae Signal ◽  
The Stability

Acoustic emission (AE) is widely used in the monitoring of coal and rock stability and early warning of dynamic disasters in mines. In this work, the Brazilian split test was carried out on limestone samples along with collecting full waveform AE signal during the entire loading process. The linear cepstrum coefficient (LCC) was used as the characteristic parameter of AE to analyze the correlation between the LCC of AE and the load of the samples. The results show that the LCC is an effective AE characteristic parameter. The first to fourth parameters of the LCC calculated using 1 s AE waveform meet the linear change relationship with the load of the samples. The correlation coefficients are 0.969, 0.943, 0.925, 0.833, respectively. The LCC of AE proposed in this work can be used as a characteristic parameter for predicting the tensile failure of rocks, which is helpful to improve the application effect of AE in the monitoring of coal and rock dynamic disasters and the stability of high and steep slopes.

Research on Hydraulic Soil Slope Frost Heaving Damage Model Test

2012 ◽  
Vol 256-259 ◽  
pp. 422-426
Author(s):  
Hua Zhong ◽  
Xiu Fen Wang ◽  
Bin Zhang
Keyword(s):  
Model Test ◽  
Damage Model ◽  
Frozen Soil ◽  
Laboratory Model ◽  
Soil Slope ◽  
Frost Heaving ◽  
Freeze Thaw ◽  
Seasonal Frozen Soil ◽  
Water Conservancy Project ◽  
Water Conservancy

Frost heaving damage of water conservancy project is widespread. In order to research the failure problems of hydraulic soil slope in dark seasonal frozen soil region, laboratory model test is carried out combined with field test section practical situation, which is the prototype of this model test. It is researched that the rule of frost heave parameters variation and the damage of soil slope during freeze-thaw cycling. That offers theoretical basis and reference for construction of water conservancy project, which will mitigate the effect and damage of freeze-thaw on hydraulic soil slope stability.

Fractal Theory Based Damage Assessing Method of Acoustic Emission Test

2009 ◽  
Vol 413-414 ◽  
pp. 335-342 ◽  
Author(s):  
Yong Huang ◽  
Hui Li ◽  
Xin Yan ◽  
Jin Ping Ou
Keyword(s):  
Acoustic Emission ◽  
Development Process ◽  
Fractal Theory ◽  
Damage Index ◽  
Damage Development ◽  
Ae Signal ◽  
Static Experiment ◽  
Acoustic Emission Test ◽  
Assessing Method ◽  
Non Destructive

Acoustic emission (AE) test monitoring is an effective non-destructive technique. In the paper, a new damage assessing method which is damage acuteness index for AE signal of PZT patches based on fractal theory was proposed. The damage index was deduced by the character of signal analysed by fractal theory. It is deduced that both the curve length and the fractal dimension (FD) of signal are related with damage development. The AE test of Pseudo-static experiment of a concrete-filled GFRP tubes (CFFT) was performed for validation. The results show that the damage acuteness index can assess damage development process effectively. So the damage acuteness index is a promising method to apply in AE test monitoring.

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