scholarly journals Investigation on the Settlement of High Rockfill Embankment Using Centrifuge Tests

2021 ◽  
Vol 9 ◽  
Author(s):  
Hong Jun Jing ◽  
Ming Jie Gou ◽  
Yan Qing Zhang ◽  
Ki-IL Song
Keyword(s):  
Steady State ◽  
Deformation Behavior ◽  
Centrifuge Model Test ◽  
Test Results ◽  
Mountain Areas ◽  
Centrifuge Model ◽  
Centrifuge Tests ◽  
Maximum Value ◽  
Reconstruction Project ◽  
National Road

To study the deformation behavior of the high rockfill (HRF) embankment during construction and operation, based on more than a 50-m high rockfill embankment of the second-class road reconstruction project from Xunyang to Ankang of the national road 316 in Shaanxi, China, the centrifuge model test was performed to study the deformation laws of HRF embankment. The test results showed the following: (i) the HRF embankment was stable during construction and operation; (ii) during construction, the settlement occurred at the embankment top, and uplift occurred at the slope foot. Moreover, the deformation at the top was greater than that at the slope foot, and the deformations at both the top and the slope toe reached the maximum value at the end of construction; (iii) during operation, the settlement at the embankment top continued, and it changed rapidly at the start of operation. And then, the rate of the settlement slowed down and reached a steady state finally. The deformation of the slope foot was very small. This study can provide basis and reference for the design and construction of a similar project in mountain areas.

Inclined Loading Capacity of Embedded Suction Anchors in Clay

2009 ◽  
Author(s):  
Y. S. Kim ◽  
K. O. Kim ◽  
Y. Cho ◽  
S. Bang ◽  
K. D. Jones
Keyword(s):  
Analytical Solution ◽  
Model Test ◽  
Inclination Angle ◽  
Load Application ◽  
Centrifuge Model Test ◽  
Loading Capacity ◽  
Test Results ◽  
Pullout Capacity ◽  
Centrifuge Model ◽  
Inclined Loading

An analytical solution has been developed to estimate the inclined pullout capacity of an embedded suction anchor in clay seafloor. Validation has been made through comparisons with a limited number of centrifuge model test results. Results indicate that the inclined pullout capacity of an embedded suction anchor in clay decreases as the load inclination angle to the horizontal increases. As the point of the load application moves downward, the inclined pullout capacity increases, reaches its peak, and then starts to decrease.

Horizontal Capacity of Embedded Suction Anchors in Clay

2010 ◽  
Vol 133 (1) ◽  
Author(s):  
S. Bang ◽  
K. Jones ◽  
Y. S. Kim ◽  
Y. Cho
Keyword(s):  
Analytical Solution ◽  
Model Test ◽  
Soil Type ◽  
Embedment Depth ◽  
Centrifuge Model Test ◽  
Test Results ◽  
Pullout Capacity ◽  
Direct Function ◽  
Centrifuge Model ◽  
Factors Influencing

The embedded suction anchor (ESA) is a type of permanent offshore foundation that is installed by a suction pile. The primary factors influencing the horizontal pullout capacity of an ESA include the loading point, the soil type, the embedment depth, and the addition of flanges. The main purpose of this study is to develop an analytical solution that is capable of estimating the horizontal pullout capacity of ESAs with the loading point being anywhere along its length with or without flanges. An analytical solution has been developed to estimate the horizontal pullout capacity of embedded suction anchors in clay seafloor. Validation has been made through comparisons with the centrifuge model test results. Results indicate that the horizontal pullout capacity of the embedded suction anchor in clay increases, reaches its peak, and then starts to decrease as the point of the load application moves downward. The effect of flanges on the horizontal pullout capacity is also found to be significant. The horizontal pullout capacity is a direct function of the loading point. The horizontal pullout capacity increases as the loading point moves downward and the maximum pullout capacity is obtained when the loading point is approximately at the mid-depth. The increase in horizontal pullout capacity can be significant, i.e., more than twice in magnitude when the maximum pullout capacity is compared with that associated with the loading point near the top or tip.

Numerical Simulation and Analysis of Centrifuge Model Tests with Nonhomogeneous Materials in Geotechnical Engineering

2013 ◽  
Vol 353-356 ◽  
pp. 495-501
Author(s):  
Lie Xian Tang ◽  
Lian Jun Guo ◽  
Da Ning Zhang ◽  
Jian Ming Zheng
Keyword(s):  
Numerical Simulation ◽  
Model Test ◽  
Geotechnical Engineering ◽  
Model Tests ◽  
Centrifuge Model Test ◽  
Test Model ◽  
Geotechnical Centrifuge ◽  
Centrifuge Model ◽  
Centrifuge Tests ◽  
Centrifuge Model Tests

The primary methods are antetype observation and model tests which to check the actual engineering status in geotechnical engineering field. The antetype observation is the best direct and convictive method, but approach miscellaneous and spend hugely. The general model tests can not fulfil the same stress between model and antetype. Geotechnical centrifuge model test can not only minish the measure of model and fulfil the comparability condition, but also can found all kinds of non-symmetrical models and simulation all kinds of complicated engineering. So the geotechnical centrifuge model test is applied widely in the geotechnical engineering. This paper used the RFPA-Centrifuge and recured to the principle of geotechnical centrifuge model test, evaluated the safety of model only by increase the physical strength. Though the numerical calculating in nonhomogeneous models with different scales showed that stress, displacement and failure mode were accord with conform ratio of centrifuge model tests. Showed the advantage that the results of RFPA can be validated each other with results of physical tests. For some specifical complicated items in geotechnical engineering, make a good test model is not only very hard and have to spend much time, but also need expensive test equipment and much money for test materials. It is very good if we can use a method to conquer these shortages. So it is advisable that using the mechod which geotechnical centrifuge tests combine RFPA-Centrifuge numerical simulation analysis method.

Horizontal Pullout Capacity of Embedded Suction Anchors in Sand

2006 ◽  
Author(s):  
S. Bang ◽  
K. Jones ◽  
Y. S. Kim ◽  
K. O. Kim ◽  
Y. Cho
Keyword(s):  
Analytical Solution ◽  
Model Test ◽  
Load Application ◽  
Centrifuge Model Test ◽  
Test Results ◽  
Pullout Capacity ◽  
Centrifuge Model

An analytical solution has been developed to estimate the horizontal pullout capacity of embedded suction anchors. Validation has been made through comparisons with the centrifuge model test results. The results indicate that the horizontal pullout capacity of the embedded suction anchor in sand increases, reaches its peak and then starts to decrease as the point of the load application moves downward. The effect of flanges on the horizontal pullout capacity is also found to be significant.

scholarly journals A STUDY OF DEEP-SEATED LANDSLIDE AND ITS DEFORMATION BEHAVIOR DUE TO ROCK BRIDGE BY CENTRIFUGE MODEL TEST

2019 ◽  
Vol 14 (2) ◽  
pp. 77-93
Author(s):  
Yota TOGASHI ◽  
Tomoki YUASA ◽  
Atsushi HASEGAWA ◽  
Takeshi KAWAGOE ◽  
Yuki KASUYA ◽  
...  
Keyword(s):  
Model Test ◽  
Deformation Behavior ◽  
Centrifuge Model Test ◽  
Rock Bridge ◽  
Centrifuge Model

scholarly journals Prefailure Deformation of Nailed Deep Excavations under Surcharge by Centrifuge Model Test

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
S. Mohammad. Shoari Shoar ◽  
Ali A. Heshmati ◽  
Hossein Salehzadeh
Keyword(s):  
Model Test ◽  
Fracture Mechanism ◽  
Ground Surface ◽  
Centrifuge Model Test ◽  
Lateral Deformation ◽  
Ground Settlement ◽  
Deep Excavations ◽  
Centrifuge Model ◽  
Centrifuge Tests ◽  
The Moment

To study prefailure deformations in nailed deep vertical excavations under various surcharges, four centrifuge tests were used to explain the lateral deformation of facing, the fracture mechanism of cement facing, and the settlement profile of the ground surface. The soil used in this research was Firoozkooh sand No. 161. Both surcharge applying and excavation were performed at 40 g acceleration. The depth of the excavation was 30 cm, the length of the nail varied from H/3 to 2H/3 (H: excavation depth), and the nails were installed horizontally. The nails were made of brass pipes and then sand coated. The results showed that the effect of surcharge on the lateral deformation of the facing as well as the fracture mechanism of facing is obvious. Also, it was seen that the ground settlement profile is two-line or three-line at the moment of facing fracture and is affected by surcharge.

The Formation of Submicrometer Scale Grains in a Super304H Steel during Multiple Compressions at 700°C

2010 ◽  
Vol 667-669 ◽  
pp. 565-570 ◽  
Author(s):  
Marina Tikhonova ◽  
Valeriy Dudko ◽  
Andrey Belyakov ◽  
Rustam Kaibyshev
Keyword(s):  
Stainless Steel ◽  
Steady State ◽  
Austenitic Stainless Steel ◽  
Deformation Behavior ◽  
Structural Changes ◽  
Submicrocrystalline Structure ◽  
Ultrafine Grains ◽  
Maximum Value ◽  
Average Size ◽  
Super304h Steel

The deformation behavior and the microstructure evolution in a 304-type austenitic stainless steel were studied in multiple forging tests at temperature of 700°C. The flow stresses increased to its maximum value with straining to about 1 and, then, slightly decreased resulting in a steady state deformation behavior at strains above 3. The structural changes were characterized by the development of a spatial net of deformation subboundaries, the misorientations of which increased to the values typical of conventional grain boundaries. The number of ultrafine grains increased with straining, leading to development of submicrocrystalline structure. The fraction of submicrocrystalline structure composed of ultrafine grains with an average size of about 300 nm exceeded 0.7 after straining to 2.

Pullout Capacity of Suction Piles in Clay Under Eccentric Vertical Loads

2011 ◽  
Author(s):  
Y. S. Kim ◽  
Y. Cho ◽  
S. Bang ◽  
K. D. Jones
Keyword(s):  
Model Tests ◽  
Mooring Line ◽  
Centrifuge Model Test ◽  
Loading Capacity ◽  
Test Results ◽  
Pullout Capacity ◽  
Test Procedures ◽  
Centrifuge Model ◽  
Centrifuge Model Tests

As part of a study on the determination of the suction pile vertical pullout loading capacity, five centrifuge model tests have been conducted on a model suction pile embedded in clay. Details of the centrifuge model test procedures and results are described. Variable in the centrifuge model tests includes the point of the mooring line attachment which was varied from the top to the bottom along the side of the model suction pile. The effect of this parameter on the suction pile vertical pullout capacity is described and discussed in detail. Test results indicate that the loading capacity increases, reaches its peak, and then decreases as the loading point moves downward.

scholarly journals The Deformation Characteristics of Weak Foundation with High Back Siltation in the Immersed Tunnel

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Xiabing Yue ◽  
Yuan Xie ◽  
Yongli Xie
Keyword(s):  
Numerical Calculation ◽  
Model Test ◽  
Calculation Method ◽  
Centrifuge Model Test ◽  
Deformation Characteristics ◽  
Test Results ◽  
Centrifuge Model ◽  
Immersed Tunnel ◽  
Natural Foundation ◽  
Tube Structure

The deformation characteristics of a weak foundation with high back siltation in an immersed tunnel lack empirical data; however, the calculation method and control of foundation settlements are highly important to tunnel design and construction. This paper takes a cross section of the natural foundation of an immersed tunnel in the Hong Kong-Zhuhai-Macao Bridge (HZMB) as the research object and conducts a centrifuge model test. The soil layer is divided, and the soil parameters are determined by the CPTU and the indoor dynamic three triaxial test. In consideration of the actual engineering scale and the ability of the centrifuge model test system, the similarity ratio of the model to the prototype is studied and determined. As for the immersed tube structure, the deformation characteristics are mainly studied. Therefore, the organic glass is selected as the model material by the similarity of the elastic modulus and the density. The characteristics of the resilience and recompression of the natural foundation of the immersed tunnel and the strain characteristics of the immersed tube structure are obtained by the analysis of the multiworking condition test data. Moreover, based on the actual engineering geological conditions of the subsea tunnel, a numerical calculation method is carried out to check the reliability of the centrifuge model test results. The results of the numerical calculation are consistent with the model test results.

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