scholarly journals Test and Study of Pipe Pile Penetration in Cohesive Soil Using FBG Sensing Technology

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1934 ◽  
Author(s):  
Yonghong Wang ◽  
Xueying Liu ◽  
Mingyi Zhang ◽  
Songkui Sang ◽  
Xiaoyu Bai
Keyword(s):  
Time History ◽  
Cohesive Soil ◽  
Displacement Sensor ◽  
Closed Model ◽  
Penetration Process ◽  
Pipe Pile ◽  
Static Penetration ◽  
Pile Penetration ◽  
Sensing Technology ◽  
The Difference

In order to examine the applicability of Fiber Bragg Grating (FBG) sensing technology in the static penetration of pipe piles, static penetration tests in clay were conducted using double-wall open and closed model pipe piles. The strain was measured using FBG sensors, and the plug height was measured using a cable displacement sensor. Using one open pile and two closed piles, the difference in pipe pile penetration was compared and analyzed. Based on FBG sensing technology and the strain data, the penetration characteristics of the pipe pile, such as axial force, lateral friction, and driving resistance were examined. Results showed that FBG sensing technology has superior testing performance for the pipe pile penetration process, can accurately reflect the strain time history of pipe piles, and can clearly reflect the penetration process of pipe piles with increasing penetration depth. In addition, the variation law of the characteristics of the jacked pile pile–soil interface was obtained. This test has significance for model tests and the engineering design of pipe piles.

scholarly journals Vegetation Height Estimation using Satellite Remote Sensing in Peat Land of Central Kalimantan

2021 ◽  
Vol 6 (1) ◽  
pp. 024-034
Author(s):  
Atriyon Julzarika ◽  
Harintaka Harintaka ◽  
Tatik Kartika
Keyword(s):  
Remote Sensing ◽  
Spatial Information ◽  
Geoid Undulation ◽  
Height Estimation ◽  
Central Kalimantan ◽  
Vegetation Height ◽  
Accuracy Test ◽  
Sensing Technology ◽  
The Difference ◽  
Difference Test

Vegetation height is an important parameter in monitoring peatlands. Vegetation height can be estimated using remote sensing. Vegetation height can be estimated by utilizing DSM and DTM. The data that can be used are LiDAR, X-SAR, and SRTM C. In this study, LiDAR data is used for DSM2018 and DTM2018 extraction. The purpose of this research is to detect the vegetation height in Central Kalimantan peatlands using remote sensing technology. The research location is in Bakengbongkei, Kalampangan, Central Kalimantan. The integration of X-SAR and SRTM C is used for DSM2000 and DTM2000 extraction. DSM2000, DTM2000, DSM2018, and DTM2018 performed height error correction with tolerance of 1.96? (95%). Then do the geoid undulation correction to EGM2008. The results obtained are DSM and DTM with a similar height reference field. If it meets these conditions it can be calculated the vegetation height estimation. Vegetation height can be obtained using the Differential DEM method. The Changing in vegetation height from 2000 to 2018 can be estimated from the difference in vegetation height from 2000 to vegetation height in 2018. Results of spatial information on vegetation height and its changes need to be tested for the accuracy. This accuracy-test includes a cross section test, height difference test, and comparison with measurements of vegetation height in the field. The results of this research can be used to monitor the changing the vegetation height in peatlands.

Application of FBG Strain Sensor with Low Temperature Sensitivity in Static Pressure PHC Pipe Pile Penetration Test

2018 ◽  
Vol 55 (4) ◽  
pp. 040602
Author(s):  
王永洪 Wang Yonghong ◽  
张明义 Zhang Mingyi ◽  
张春巍 Zhang Chunwei ◽  
白晓宇 Bai Xiaoyu ◽  
刘倩 Liu Qian
Keyword(s):  
Low Temperature ◽  
Temperature Sensitivity ◽  
Static Pressure ◽  
Strain Sensor ◽  
Penetration Test ◽  
Pipe Pile ◽  
Pile Penetration

scholarly journals Analysis of Dynamic Coupling Characteristics of the Slope Reinforced by Sheet Pile Wall

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
H. L. Qu ◽  
H. Luo ◽  
L. Liu ◽  
Y. Liu
Keyword(s):  
Slip Surface ◽  
Retaining Wall ◽  
Time History ◽  
Interaction Force ◽  
Body Parts ◽  
Sheet Pile ◽  
Stabilizing Piles ◽  
The Difference ◽  
Coupling Characteristics ◽  
Sheet Pile Wall

Large deformation of slope caused by earthquake can lead to the loss of stability of slope and its retaining structures. At present, there have been some research achievements about the slope reinforcement of stabilizing piles. However, due to the complexity of the structural system, the coupling relationship between soil and pile is still not well understood. Hence it is of great necessity to study its dynamic characteristics further. In view of this, a numerical model was established by FLAC3D in this paper, and the deformation and stress nephogram of sheet pile wall in peak ground motion acceleration (PGA) at 0.1 g, 0.2 g, and 0.4 g were obtained. Through the analysis, some conclusions were obtained. Firstly, based on the nephogram of motion characteristics and the positions of the slip surface and the retaining wall, the reinforced slope can be divided into 6 sections approximatively, namely, the sliding body parts of A, B, C, D, and E and the bedrock part F. Secondly, the deformation and stress distributions of slope reinforced by sheet pile wall were carefully studied. Based on the results of deformation calculation from time history analysis, the interaction force between structure and soil can be estimated by the difference of peak horizontal displacements, and the structure-soil coupling law under earthquake can be studied by this approach.

Experimental Simulation on Open-Ended Pipe Pile Penetration Using Transparent Granule

2020 ◽  
Vol 24 (8) ◽  
pp. 2281-2292
Author(s):  
Jin-Hui Zheng ◽  
Chang-Guang Qi ◽  
Xin Zhao ◽  
Xin-Quan Wang ◽  
Yan-Ling Shan
Keyword(s):  
Experimental Simulation ◽  
Pipe Pile ◽  
Pile Penetration

Fundamental performance of a smart structural system utilizing thermal expansion for pointing

2017 ◽  
Vol 30 (9) ◽  
pp. 1397-1408 ◽  
Author(s):  
Takeshi Shimada ◽  
Kosei Ishimura ◽  
Kawano Taro
Keyword(s):  
Large Scale ◽  
Control Mechanism ◽  
Displacement Sensor ◽  
Internal Displacement ◽  
Structural System ◽  
Element Analysis ◽  
The Difference ◽  
High Control ◽  
Pointing Control ◽  
Ball Joints

This study involved designing and developing a smart structural system for pointing control of large-scale trusses. The system consisted of a pointing control mechanism, an internal displacement-sensor, and a controller. The significant points of the system included the following: (1) artificial thermal expansions of truss members were utilized as linear actuators, (2) elastic hinges were employed instead of ball joints, and (3) the internal displacement-sensor that did not require external jigs and possessed high measuring accuracy was applied. The study involved conducting a feasibility study and an experimental demonstration. The results indicated that the pointing control mechanism produced a sufficient tilt angle to satisfy typical requirements of recent scientific satellites. Furthermore, the findings confirmed that the hysteresis of the pointing control mechanism could be kept sufficiently small due to the absence of sliding parts. The difference between the finite element analysis and the measured value corresponded to [Formula: see text] for a [Formula: see text] long truss. Additionally, the results suggested that the proposed smart structural system for pointing exhibited high control accuracy and tracking performance for a periodic motion. The root mean square error value for a circular trajectory with a radius of [Formula: see text] for a period of [Formula: see text] corresponded to [Formula: see text] for the [Formula: see text] long truss.

The Research of Sensor Application Status

2014 ◽  
Vol 651-653 ◽  
pp. 543-546
Author(s):  
Xiao Wen Wang
Keyword(s):  
Temperature Sensor ◽  
Information Society ◽  
Rapid Development ◽  
Developed Countries ◽  
Displacement Sensor ◽  
Sensor Technology ◽  
Current Sensor ◽  
Modern Information Technology ◽  
Sensing Technology ◽  
Modern Information

Sensing technology is a rapid development of technology, is one of the main technology of modern information technology, developed countries in recent years the use of sensors in the information society a new understanding and evaluation, and sensor technology has been widely used in various fields. This paper mainly introduces the temperature sensor, pressure sensor, displacement sensor, the principle and application of the current sensor.

A Correlation for Nusselt Number Under Turbulent Mixed Convection Using Transient Heat Transfer Experiments

2010 ◽  
Author(s):  
N. Gnanasekaran ◽  
C. Balaji
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Mixed Convection ◽  
A Priori ◽  
Convective Heat Transfer Coefficient ◽  
Time History ◽  
Vertical Channel ◽  
The Difference ◽  
Nusselt Number Correlation ◽  
Temperature Time

This paper reports the results of an experimental investigation of transient, turbulent mixed convection in a vertical channel in which one of the walls is heated and the other is adiabatic. The goal is to simultaneously estimate the constants in a Nusselt number correlation whose form is assumed a priori by synergistically marrying the experimental results with repeated numerical calculations that assume guess values of the constants. The convective heat transfer coefficient “h” is replaced by the Nusselt number (Nu) which is then assumed to have a form Nu = a (1+RiD) b ReDc where a, b and c are the constants to be evaluated. From the experimentally obtained temperature time history and the simulated temperature time history, based on some guess values of a, b, and c, one can define the objective function or the residue as the sum of the square of the difference between experimentally obtained and simulated temperatures. Using Bayesian inference driven by the Markov chain Monte Carlo method, one, more or all of the constants a, b and c are retrieved together with the uncertainty involved in these estimates. Additionally, the estimated parameters are compared with experimental benchmarks.

scholarly journals Grain-scale DEM study of open-ended pipe pile penetration in granular soils

2021 ◽  
Vol 249 ◽  
pp. 11007
Author(s):  
Michail Komodromos ◽  
Gaël Combe ◽  
Gioacchino Viggiani
Keyword(s):  
Distinct Element ◽  
Horizontal Stress ◽  
Granular Soils ◽  
Pipe Pile ◽  
Pile Shaft ◽  
Offshore Engineering ◽  
Pile Penetration ◽  
Penetration Tests ◽  
Shed Light ◽  
Number Of Particles

Open-Ended Pipe Piles (OEPP) are particularly popular in offshore engineering. An important feature of the installation of these piles is the rate with which soil enters the pile from the bottom, and its interaction with the internal pile shaft. The response of OEPP crucially depends on the occurrence of soil plugging, which can make the behavior of an OEPP similar to a pile of solid cross section. Plugging is generally attributed to arching effects in the soil; therefore, understanding this phenomenon requires an investigation at the grain scale. This is precisely the objective of this study, where the Distinct Element Method (DEM) is used to study the installation of an Open-Ended Pipe Pile in a Virtual Calibration Chamber comprising 128000 grains, under constant horizontal stress. Despite the relatively small number of particles, this numerical model is found to be able to reproduce several aspects of the mechanisms actually observed in thefield. The results are compared to those obtained from actual experiments of miniature pile penetration tests. Stress and strainfields that develop in the soil inside and outside the pile provide interesting data and shed light on the mechanisms at play during OEPP installation, especially as for the influence of grains interlocking.

scholarly journals A Historical Review of Data and Information of Indonesian Mangroves Area

2019 ◽  
Vol 24 (2) ◽  
pp. 163-178 ◽  
Author(s):  
Aswin Rahadian ◽  
Lilik Budi Prasetyo ◽  
Yudi Setiawan ◽  
Ketut Wikantika
Keyword(s):  
Historical Review ◽  
Data Availability ◽  
Mangrove Forests ◽  
Quality Of Data ◽  
Mangrove Area ◽  
Sensing Technology ◽  
Comprehensive Information ◽  
Study Results ◽  
Depth Study ◽  
The Difference

Quantification of the mangrove area in Indonesia was very diverse, which is quantified in the pre and post development of remote sensing technology. This causes uncertainty comprehensive information of mangrove in Indonesia. The planners at national and international level of faced with the problems of uncertainty information that has implications for the quality of data availability. Therefore, it is important to develop a comprehensive of mangrove extent and distribution database. The method used in-depth study literature on various publications related mangrove mapping in Indonesia and comparative analysis. This study aims to identify comprehensive information mangrove forests of Indonesia and analyze the factors which cause diversity of quantification area and reliability of data. We found 42 publications containing data and information on Indonesia's mangrove forests area, with 17 sources including detailed information per province. The study results showed that the difference mangrove quantification area was influenced by several main factors including analysis periode, differences in the concept and mangrove boundaries, basic data and scale, method of mangrove mapping, as well as regional coverage. Keywords: historical data, Indonesia, mangrove area  

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