Geotechnical synthesis of 2D_Electrical resistivity tomography of geomaterial_laboratory model study

2011 ◽  
Vol 8 (1) ◽  
pp. 1
Author(s):  
Zainab Mohamed ◽  
Nurbaiyah Mohamad Noh
Keyword(s):  
Electrical Resistivity ◽  
Cement Mortar ◽  
Clay Fraction ◽  
Soil Mass ◽  
Mass Scale ◽  
Scale Model ◽  
Hard Material ◽  
Residual Soil ◽  
Hard Layer ◽  
Model Study

In this paper, a laboratory scale model study was conducted on interbeded geomaterial using electrical resistivity instrument. The electrical resistivity value of individual material was determined and modeled as mass scale. The tank was filled with composite geomaterial constituted of interbedding of cement mortar as hard layer and residual sedimentary soil. Forty-one copper electrodes of 15 cm long were used and installed at 4 cm spacing in the tank. The composite geomaterials were labeled as Model 1, Model 2 and Model 3, where they were referred respectively to interbedding of hard layer and layers of residual soil at natural dry state and wet state. The electrical resistivity terrameter was used to obtain the georesistivity pseudo-section by adopting Werner protocol. The georesistivity pseudo-sections were derived from 3 models simulated the subsurface of rock mass in humid tropic environment. The objective was to synthesize the composite georesistivity pseudo-section based on geo-engineering principle. It was observed that the pseudo-section of the composite geomaterial was represented by range of colors with range of georesistivity values. The horizontal bands of color differentiated the georesistivity of models vertically but constant in horizontal direction. The georesistivity value at material scale was comparable to the range of georesistivity values derived from the 2D electrical resistivity pseudo-sections. The contrasts in the conductivity of clay fraction, silica and electrolytes have differentiated the electrical resistivity pseudo-section of sandy soil mass and cement mortar hard material.

scholarly journals THE EFFECT OF WAVE DIRECTION ON SHIP MOTIONS IN A HARBOUR ENTRANCE CHANNEL - MODEL STUDY APPROACH

1984 ◽  
Vol 1 (19) ◽  
pp. 217
Author(s):  
A.C. Van Wyk ◽  
J.A. Zwamborn
Keyword(s):  
Channel Model ◽  
Basic Knowledge ◽  
Scale Model ◽  
Ship Motions ◽  
Wave Direction ◽  
Extreme Wave ◽  
Essential Requirement ◽  
Study Approach ◽  
Model Study ◽  
Bulk Carriers

Basic knowledge of a ship's vertical motions in waves of different angles of approach is an essential requirement in the formulation of allowance criteria on which to base harbour accessibility under extreme wave conditions. A comprehensive series of scale model tests are being undertaken to establish minimum underkeel clearance for given channel depths and sea states using two models representing typical 150 000 and 270 000 dwt bulk carriers.

scholarly journals A Scale Model Study of the Bosomtwe Crater.

1965 ◽  
Vol 70 ◽  
pp. 324
Author(s):  
G. H. S. Jones ◽  
C. H. H. Diehl
Keyword(s):  
Scale Model ◽  
Model Study

Nonlinear soil-structure behavior of a deployable and compliant anchor system

2021 ◽  
Author(s):  
Ann Sychterz ◽  
Isabella Bernardi ◽  
Joe G Tom ◽  
Ryan D. Beemer
Keyword(s):  
Numerical Models ◽  
Shape Change ◽  
Flexible Structures ◽  
Element Model ◽  
Soil Mass ◽  
Structural Deformation ◽  
Scale Model ◽  
Anchor System ◽  
Material Usage ◽  
Space Saving

This paper presents a novel compliant geo-structural systems bio-inspired by awns on grass seeds for increasing anchor capacity while minimizing material usage. A compliant deployable structure is here defined as a system that reacts to global displacements by continued elastic shape change and awns are slender flexible structures rigidly connected to the exterior of an anchor. When the anchor is loaded in tension, the awns react off the soil mass and deploy outwards from the pile shaft, enabling space-saving measures for transportation. This paper creates a structural pushover model to establish awn deformations and stress values, a scale model of the compliant system fabricated using additive manufacturing, geo-plasticity numerical models of soil awn interaction, and a finite element model of an example application. This research elucidates the soil displacement mechanisms around the awns, the structural deformation of individual awns, and the enhancement of overall anchor capacity due to awn deployment.

Reduced-scale model study on cable heat dissipation and airflow distribution of power cabins

2019 ◽  
Vol 160 ◽  
pp. 114068 ◽  
Author(s):  
Jiaxu Wang ◽  
Xuefeng Liu ◽  
Siwei Chen ◽  
Hanghang Jiang ◽  
Guanyu Fang ◽  
...  
Keyword(s):  
Heat Dissipation ◽  
Scale Model ◽  
Model Study ◽  
Airflow Distribution ◽  
Distribution Of Power ◽  
Reduced Scale

Acoustical scale model study of the attenuation of sound by wide barriers

1977 ◽  
Vol 62 (3) ◽  
pp. 601-606 ◽  
Author(s):  
Elizabeth S. Ivey ◽  
G. A. Russell
Keyword(s):  
Scale Model ◽  
Model Study

scholarly journals Mechanical and Electrical Characteristics of WB2 Synthesized at High Pressure and High Temperature

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1212 ◽  
Author(s):  
Changchun Wang ◽  
Lele Song ◽  
Yupeng Xie
Keyword(s):  
Grain Size ◽  
High Pressure ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Vickers Hardness ◽  
Single Phase ◽  
Hard Material ◽  
Experimental Conditions ◽  
Boundary Density ◽  
Grain Sizes

Single-phase tungsten diboride (WB2) was synthesized at high pressure and high temperature. The different grain sizes ranging from 300 nm to 3 µm were successfully obtained in WB2 by controlling the experimental conditions. The effects of grain size on hardness and resistivity properties were investigated. The Vickers hardness of WB2 was modulated with grain size. The maximum asymptotic Vickers hardness is 25.5 GPa for WB2 with a grain size of 300 nm which is a 10% increase compared to WB2 with a grain size of 3 µm. The optimal electrical resistivity of WB2 was 10−7 Ωm with the biggest grain size of 3 µm, which is ascribed to low grain boundary density. The superior properties of hardness and electrical resistivity demonstrate that WB2 should be a new functional hard material replacing WC which is widely used in industrial production.

scholarly journals Characteristics of CO2 and Energy-Saving Concrete with Porous Feldspar

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4204
Author(s):  
Jung-Geun Han ◽  
Jin-Woo Cho ◽  
Sung-Wook Kim ◽  
Yun-Suk Park ◽  
Jong-Young Lee
Keyword(s):  
Compressive Strength ◽  
Thermal Diffusion ◽  
Large Scale ◽  
Heat Storage ◽  
Cement Mortar ◽  
Cement Content ◽  
Chemical Activation ◽  
Scale Model ◽  
Unit Weight ◽  
Storage Characteristics

In this study, to reduce the use of cement and sand, porous feldspar with excellent economic efficiency was used as a substitute in the heat storage concrete layer. When porous feldspar and four other silicate minerals were used as substitute materials for sand in cement mortar, the specimen with the porous feldspar exhibited approximately 16–63% higher compressive strength, thereby exhibiting a higher reactivity with cement compared to the other minerals. To compensate for the reduction in strength owing to the decreased cement content, mechanical and chemical activation methods were employed. When the specific surface area of porous feldspar was increased, the unit weight was reduced by approximately 30% and the compressive strength was increased by up to 90%. In addition, the results of the thermal diffusion test confirmed that thermal diffusion increased owing to a reduction in the unit weight; the heat storage characteristics improved owing to the better porosity of feldspar. When chemical activation was performed after reducing the cement content by 5% and replacing the sand with porous feldspar, the compressive strength was found to be approximately twice that of an ordinary cement mortar. In a large-scale model experiment, the heat storage layer containing the porous feldspar exhibited better heat conduction and heat storage characteristics than the heat storage layer composed of ordinary cement mortar. Additionally, energy savings of 57% were observed.

Self-Healing Effect Caused by Accelerated Carbonation of Thermally Damaged Cement Mortar: Changes in Microstructural and Macroscopic Properties

2014 ◽  
Vol 529 ◽  
pp. 36-40
Author(s):  
Son Tung Pham ◽  
William Prince
Keyword(s):  
Electrical Resistivity ◽  
High Temperature ◽  
Cement Mortar ◽  
Nitrogen Adsorption ◽  
The Self ◽  
Size Distributions ◽  
Self Healing ◽  
Accelerated Carbonation ◽  
Healing Effect ◽  
Macroscopic Properties

The objective of this work was to examine the influence of accelerated carbonation on the microstructural and macroscopic properties of thermally damage cement mortar. A normalised CEM II mortar was treated at 500°C then submitted to carbonation at 20°C, 65% relative humidity and 20% of CO2 concentration. The pores size distributions were determined from nitrogen adsorption. We also followed changes in electrical resistivity and ultrasonic velocity. The results showed that losses of macroscopic properties caused by cracks appeared at high temperature were restored due to carbonation. This highlighted the self-healing effect by accelerated carbonation which allowed the thermally damaged mortar to recover its initial properties.

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