scholarly journals Analysis of Deformation Characteristics of Long-Short Pile Composite Foundation in Salt Lake Area, Iran

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Wei Liu ◽  
Xiaohua Yang ◽  
Shasha Zhang ◽  
Xiangxin Kong ◽  
Weizhi Chen
Keyword(s):  
Model Test ◽  
Stress Ratio ◽  
Salt Lake ◽  
Composite Foundation ◽  
Centrifuge Model Test ◽  
Geological Condition ◽  
Lake Area ◽  
Deformation Characteristics ◽  
Pile Spacing ◽  
Centrifuge Model

To study the settlement and deformation characteristics of a long-short pile composite foundation and its influencing factors, the indoor centrifuge model test and numerical simulations were performed under the actual working conditions to treat the saline soft soil foundation in the Soltan salt lake area of Iran. Firstly, the settlement of a long-short pile composite foundation and the law of pile-soil stress ratio development with time were studied using a centrifuge model test. In addition, FLAC3D was used to simulate the test conditions, and it has been observed that the numerical and experimental results were in good agreement. Based on the numerical model, the effects of the replacement rate of long and short piles, cushion modulus, and pile length on the settlement of the composite foundation and the stress ratio of long and short piles were analyzed. The results show that the long-short pile composite foundation can effectively control settlement. Compared to the untreated foundation, the total settlement of a long-short pile composite foundation was reduced by 67%, and the postconstruction settlement was reduced by 47.7%. Compared to the final settlement of the composite foundation obtained using the centrifuge model test, the error range of the numerical simulation results was between 2.4% and 8%. The influence of pile spacing on the settlement and stress characteristics of a long-short pile composite foundation is greater than that attributable to the arrangement of the piles. Under this geological condition, it is reasonable to choose a pile spacing of 4d∼5d. When the long pile reaches the bearing stratum, the length of the short pile should not exceed 0.6 times the length of the long pile. The setting cushion not only reduces uneven settlement of the composite foundation but also improves the joint bearing capacity of the pile and the soil between the piles.

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.

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.

scholarly journals DYNAMIC CENTRIFUGE MODEL TEST ON PILED GEO-WALL

2009 ◽  
Vol 24 ◽  
pp. 257-262
Author(s):  
Takashi HARA ◽  
Shinichiro TSUJI ◽  
Atsushi Yashima ◽  
Naoki TATTA
Keyword(s):  
Model Test ◽  
Centrifuge Model Test ◽  
Centrifuge Model
Sign in / Sign up

Export Citation Format

Share Document