Evaluation of strength and deformation characteristic parameters for boulder clay at SGGW Campus considering test location

ce/papers ◽  
2018 ◽  
Vol 2 (2-3) ◽  
pp. 749-754
Author(s):  
Simon RABARIJOELY ◽  
Kazimierz GARBULEWSKI
Keyword(s):  
Deformation Characteristic ◽  
Characteristic Parameters ◽  
Test Location ◽  
Strength And Deformation ◽  
Boulder Clay

scholarly journals Suction controlled triaxial testing of unsaturated medium sand and sandy clay

2014 ◽  
Vol 46 (4) ◽  
pp. 301-307 ◽  
Author(s):  
Zdzisław Skutnik ◽  
Marcin Biliniak
Keyword(s):  
Shear Strength ◽  
Deformation Characteristic ◽  
Matric Suction ◽  
Triaxial Tests ◽  
Triaxial Testing ◽  
Medium Sand ◽  
Saturation State ◽  
Sandy Clay ◽  
Strength And Deformation ◽  
Modern Apparatus

Abstract Suction controlled triaxial testing of unsaturated medium sand and sandy clay. This paper presents the results of the triaxial tests performed on medium sand and sandy clay samples. The shear strength and deformation characteristics from consolidated drained (CD) tests performed in a controlled saturation state were determined. The study was conducted in a modern apparatus for triaxial testing of unsaturated samples. Test specimens with a diameter of 70 mm and height of 140 mm were prepared by compaction in a laboratory in a special form. The main aim of this study was to investigate the effect of matric suction on the shear strength and deformation characteristic of medium sand and sandy clay. The axis translation technique was used to apply matric suction to soil specimens.

scholarly journals Strength and deformation parameters of boulder clay to design of buildings at the margin of a moraine plateau in Warsaw

2018 ◽  
Vol 50 (1) ◽  
pp. 55-67
Author(s):  
Simon Rabarijoely ◽  
Kazimierz Garbulewski
Keyword(s):  
Soil Parameters ◽  
Deformation Parameters ◽  
Deformation Properties ◽  
Geotechnical Design ◽  
Strength And Deformation ◽  
Boulder Clay ◽  
Characteristic Values ◽  
Academic Buildings ◽  
Design Calculations ◽  
Selection Of

Abstract The selection of soil parameters suitable to the geotechnical design calculations is regarded widely as one of the most important and simultaneously difficult engineering task, which according to the Eurocode 7 standards should be undertaken into distinct three steps. The second of these steps, namely obtaining the characteristic values requires a careful and a cautions estimation with application of the statistical methods even by using a Bayesian approach as shown in this paper. This paper presents the process of selecting a characteristic strength and deformation parameters from CPT and DMT investigation for boulder clays discovered at the margin of a moraine plateau in Warsaw. This layer was chosen for foundations of design academic buildings. In the selection of the characteristic parameters with application of the numerical program BAYANAL the spatial distribution of strength and deformation properties was taken into account. Particular attention was focused to the affect resulting from in situ test locations at different distances from the design facilities. Finally, the remark conclusions were presented including opinion on the role of aims and spacing of investigation points in geotechnical designing.

scholarly journals Deformation Characteristics of Sand Geofoam Blocks using Large-Scale Oedometer Apparatus

2017 ◽  
Vol 3 (8) ◽  
pp. 585-593 ◽  
Author(s):  
Reza Jamshidi Chenari ◽  
Alireza Firoozfar ◽  
Shekofeh Attari ◽  
Ardavan Izadi ◽  
Seyed Ebrahim Shafiei
Keyword(s):  
Large Scale ◽  
Volume Fraction ◽  
Deformation Characteristic ◽  
Expanded Polystyrene ◽  
Characteristic Parameters ◽  
Eps Geofoam ◽  
Strain Behavior ◽  
Volume Compressibility ◽  
Geotechnical Structures ◽  
Compressibility Coefficient

As a lightweight fill material, expanded polystyrene (EPS) geofoam block has been successfully utilized in geotechnical applications due to its low density and high compressive strength. Understanding the modulus of elasticity and compressibility coefficient of sand-EPS is an aspect that has not been fully understood which may have a significant effect on the design and construction of geotechnical structures. In this study, an attempt has been made to understand the behavior of deformation characteristic parameters of sand-geofoam block combinations with different patterns, using a newly designed and fabricated large-scale oedometer apparatus. The influence of both different combinations of sand-EPS geofoam and relative densities of soil, on the stress-strain behavior and coefficient of volume compressibility under controlled conditions, are experimentally studied. Specimens of EPS geofoam with a density of 8 kg/m3 were tested in relative densities of 35% and 70% of sand under six different overburden pressures of 50 kPa, 100 kPa, 150 kPa, 200 kPa, 250 kPa, and 300 kPa. From the experimental results, it is observed that the settlement and volume compressibility coefficient substantially increased, as the thickness of EPS geofoam increases. Furthermore, utilization of thinner EPS layers with the constant volume fraction ratio of EPS led to the greater settlement.

Research on Wet-Chemical Deformation of Roadbed Built with Weathered Stone

2011 ◽  
Vol 383-390 ◽  
pp. 3695-3699
Author(s):  
Chao Qun Hou ◽  
Xiao Mou Wang ◽  
Ling Yun Yang
Keyword(s):  
Large Scale ◽  
Deformation Characteristic ◽  
Constant Load ◽  
Structure Design ◽  
Loading Test ◽  
Triaxial Shear Test ◽  
Strength And Deformation ◽  
Wet Chemical ◽  
Modulus Of Resilience ◽  
Plate Loading

Based on analyses on mineral composition, mechanical property and hydrology property, large-scale triaxial shear test and vibration test were used to study the effect on strength and deformation characteristic, which was caused by wet-chemical and soften of the fillings. Then trial roadbed was filled with 3 typical rocks. Modulus of resilience on the top of the roadbed was gotten via a larger-diameter (D=75 cm) plate loading test which could provide important parameter for pavement structure design. Wet-chemical deformation is researched under constant load amount to deadweight of the roadbed. Experiment results show : (1)single-axle compressive strength (>15 MPa) and modulus of resilience (E0=91.7 MPa) of 3 fillings match the requirement according to specification; (2) these 3 rocks can be used as filling in roadbed; (3) as the fillings have wet-chemical, soften, and expansion properties, the suggestion of damp-proofing and drainage works should be adopted in construction.

Siphon Flows in Stratified Coronal Loops

1994 ◽  
Vol 144 ◽  
pp. 185-187
Author(s):  
S. Orlando ◽  
G. Peres ◽  
S. Serio
Keyword(s):  
Heat Flux ◽  
Scaling Laws ◽  
Flow Model ◽  
Supersonic Flows ◽  
Coronal Loops ◽  
Characteristic Parameters

AbstractWe have developed a detailed siphon flow model for coronal loops. We find scaling laws relating the characteristic parameters of the loop, explore systematically the space of solutions and show that supersonic flows are impossible for realistic values of heat flux at the base of the upflowing leg.

The Condition for Absolute Stability of an Electroelastic Actuator Control System for Nanomechatronics

2020 ◽  
Vol 10 (10) ◽  
pp. 52-58
Author(s):  
Sergey M. AFONIN ◽  
Keyword(s):  
Control System ◽  
Adaptive Optics ◽  
Absolute Stability ◽  
Deformation Characteristic ◽  
Straight Line Segment ◽  
Control Mechanisms ◽  
Relative Width ◽  
Random Inputs ◽  
Deformation Control ◽  
Actuator Control

An electroelastic actuator for nanomechatronics is used in nanotechnology, adaptive optics, microsurgery, microelectronics, and biomedicine to actuate or control mechanisms, systems based on the electroelastic effect, and to convert electrical signals into mechanical displacements and forces. In nanomechatronic systems, a piezoactuator is used in scanning microscopy, laser systems, in astronomy for precision alignment, for compensation of temperature, gravitational deformations and atmospheric turbulence, focusing, and stabilizing the image. In this study, a condition for absolute stability of an electroelastic actuator control system for nanomechatronics under deterministic and random inputs is obtained. A number of equilibrium positions in an electroelastic actuator mechatronic control system are found, the totality of which is represented by a straight line segment. The electroelastic actuator’s deformation control system dead band relative width is determined for the actuator’s symmetric and asymmetric hysteresis characteristics. Under deterministic inputs and with fulfilling the condition for the derivative of the nonlinear hysteresis actuator deformation characteristic, the set of equilibrium positions of the electroelastic actuator control system for nanomechatronics is absolutely stable. Under random inputs, the system absolute stability with respect to the mathematical expectations of the electroelastic actuator mechatronic control system equilibrium positions has been determined subject to fulfilling the condition on the derivative of the actuator hysteresis characteristic.

Solving the Problem of Silicon Dioxide Melting Based on Deviation Model

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Yuhan Sun
Keyword(s):  
Silicon Dioxide ◽  
Blast Furnace Slag ◽  
Melting Process ◽  
Melting Rate ◽  
Dissolution Behavior ◽  
Characteristic Parameters ◽  
Contour Feature ◽  
Time Periods ◽  
Main Component ◽  
Furnace Slag

Abstract: In order to reveal the dissolution behavior of iron tailings in blast furnace slag, we studied the main component of silica in iron tailings. First, edge contour features need to be established to represent the melting process of silica. We choose shape, perimeter, area and generalized radius as objects. By independently analyzing the influence of these four indexes on the melting rate, the area and shape were selected as the characteristic parameters of the edge contour of the silica particles. Then, the actual melting rate of the silica is estimated by the edge contour feature index. Finally, we can calculate the melting rate of the first second of three time periods of 0.00010312mm3/s，0.0002399mm3/s，0.0000538mm3/s.

Purification of water contaminated with heavy metals by example of lead as promising material based on graphene nanostructures

2020 ◽  
pp. 34-43
Author(s):  
N. R. Memetov ◽  
◽  
A. V. Gerasimova ◽  
A. E. Kucherova ◽  
◽  
...  
Keyword(s):  
Adsorption Process ◽  
Phenol Formaldehyde ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Parameter Estimates ◽  
Maximum Adsorption Capacity ◽  
Ecological Situation ◽  
Characteristic Parameters ◽  
Purification Of Water ◽  
Graphene Nanostructures

The paper evaluates the effectiveness of the use of graphene nanostructures in the purification of lead (II) ions to improve the ecological situation of water bodies. The mechanisms and characteristic parameters of the adsorption process were analyzed using empirical models of isotherms at temperatures of 298, 303, 313 and 323 K, which correspond to the following order (based on the correlation coefficient): Langmuir (0.99) > Temkin (0.97) > Dubinin – Radushkevich (0.90). The maximum adsorption capacity of the material corresponds to the range from 230 to 260 mg/g. We research the equilibrium at the level of thermodynamic parameter estimates, which indicates the spontaneity of the process, the endothermic nature and structure change of graphene modified with phenol-formaldehyde resin during the adsorption of lead (II) ions, leading to an increase in the disorder of the system.

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