Model tests of modified suction caissons in marine sand under monotonic lateral combined loading

2014 ◽  
Vol 48 ◽  
pp. 137-147 ◽  
Author(s):  
Dayong Li ◽  
Lingyun Feng ◽  
Yukun Zhang
Keyword(s):  
Model Tests ◽  
Combined Loading ◽  
Marine Sand ◽  
Suction Caissons

scholarly journals Model Tests on Characteristic of Suction Caissons in Saturated Fine Sand Under Intermittent Loading

2018 ◽  
Vol 25 (s3) ◽  
pp. 127-135 ◽  
Author(s):  
Ping Shi
Keyword(s):  
Penetration Depth ◽  
Fine Sand ◽  
Model Tests ◽  
Offshore Wind ◽  
Test Results ◽  
Offshore Wind Power ◽  
Oil Platforms ◽  
Offshore Oil Platforms ◽  
Offshore Oil ◽  
Suction Caissons

Abstract Suction caissons are often used for the caissons of both offshore oil platforms and offshore wind power projects because of their advantages of simple construction, economical cost, and reusability. In this study, model tests were conducted in sand in order to investigate the effects of the caisson installation method on the penetration depth and the critical suction. Results of the test program showed that the method of changing the frequency of suction during different stages of the process can increase the penetration depth of the caisson. Combining with the deformation of the soil body inside and outside the caisson, the existing method for calculating the critical suction is modified, and the critical suction calculation equation of the discontinuous penetration test is proposed. Based on the test results, the calculation equation of the soil heave height can be more accurate predicted. The analysis results verify that the calculation method and the actual results are in good agreement.

Model tests on installation and extraction of suction caissons in dense sand

2017 ◽  
Vol 35 (7) ◽  
pp. 921-929 ◽  
Author(s):  
Yukun Zhang ◽  
Dayong Li ◽  
Yufeng Gao
Keyword(s):  
Model Tests ◽  
Dense Sand ◽  
Suction Caissons

Model tests on installation techniques of suction caissons in a soft clay seabed

2012 ◽  
Vol 34 ◽  
pp. 116-125 ◽  
Author(s):  
Zhen Guo ◽  
Lizhong Wang ◽  
Feng Yuan ◽  
Lingling Li
Keyword(s):  
Soft Clay ◽  
Model Tests ◽  
Suction Caissons

Method Evaluating Axial Response of Vertically-Loaded Piles During Spudcan Penetration

2019 ◽  
Author(s):  
Yifei Fan ◽  
Jianhua Wang
Keyword(s):  
Free Field ◽  
Model Tests ◽  
Combined Loading ◽  
Lateral Direction ◽  
Soil Movement ◽  
Centrifuge Model ◽  
Soil Displacement ◽  
Loading Effects ◽  
Axial Response ◽  
Centrifuge Model Tests

Abstract Large soil deformation can be induced during spudcan penetration into stratum near an existing piled foundation of a fixed offshore platform, and some research has been done on the effects of spudcan penetration on the lateral response of an adjacent pile. However, available centrifuge model tests found that the maximum vertical soil displacements are manifested in the same magnitude compared with those in the lateral direction, leading to large negative friction along the pile shaft. Also, the combined loading effects of transmitted loads from the upper structure should be taken into account in axial analysis during spudcan penetration, which has been proved important in prediction of axial pile response due to soil movement. This paper investigates a method to quantitatively evaluate the effect of spudcan penetration on vertical response of an adjacent pile. The vertical soil displacement is found by first simulating a free field spudcan penetration by Coupled Eulerian-Lagrange (CEL) method. The flow field is then analyzed to calculate the displacement components at specific pile location. Then the predicted vertical soil displacement profile is input into the nonlinear foundation pile model to determine the axial response of an adjacent pile subjected to spudcan penetration-induced axial and pile head loads. The proposed method is adopted to analyze centrifuge model tests in sand and clay, and predicted results prove to be basically in agreement with measured ones.

scholarly journals Model Tests on the Penetration Resistance of Bucket Foundations for Offshore Wind Turbines in Sand

2020 ◽  
Vol 8 (5) ◽  
pp. 368
Author(s):  
Hongyan Ding ◽  
Yanjian Peng ◽  
Puyang Zhang ◽  
Hanbo Zhai ◽  
Nan Jia
Keyword(s):  
Wind Turbines ◽  
Rapid Development ◽  
Wind Farms ◽  
Penetration Resistance ◽  
Model Tests ◽  
Offshore Wind ◽  
Offshore Wind Farms ◽  
Offshore Wind Turbines ◽  
Marine Sand ◽  
Efficient Construction

Driven by the rapid development of offshore wind farms, bucket foundations have come to constitute a very promising form of foundation for offshore wind turbines, mainly owing to their efficient construction. However, the penetration resistance of the suction penetration of a bucket foundation, when calculated inaccurately, may lead to installation failure of the foundation. In this study, model tests were performed on the suction penetration of a mono-bucket mono-compartment foundation and a mono-bucket multi-compartment foundation in saturated fine marine sand, aiming to compare their penetration resistances and critical suctions, and the development of a soil plug in the two models was analyzed. The results will provide a design reference for the penetration construction of bucket foundations for offshore wind turbines.

scholarly journals Small-scale Geotechnical Testing Using a Six-axis Robot

2020 ◽  
Author(s):  
Zhefei Jin ◽  
Zhenhao Shi ◽  
James Hambleton
Keyword(s):  
Moving Objects ◽  
Force Measurement ◽  
Industrial Robot ◽  
Model Tests ◽  
Combined Loading ◽  
Small Scale ◽  
Multiple Components ◽  
Geotechnical Testing ◽  
Force Displacement ◽  
Machine Interaction

Single-gravity (1-g) small-scale testing is a widely used method to investigate geomechanics problems that involve the interactions between soils and objects (e.g., structures or machine parts). This letter presents a new approach for performing 1-g model tests where a six-axis industrial robot functions as a versatile actuator capable of moving objects along virtually arbitrary trajectories, while simultaneously tracking multiple components of force and moment acting on the objects. A performance evaluation confirms that the robot's motion control and force measurement are sufficiently accurate for geotechnical model tests. This assessment is completed through two benchmarking exercises: (1) determining the failure envelope of a strip foundation subjected to combined loading and (2) quantifying the force-displacement history for the soil cutting process (e.g., for applications in soil-machine interaction).

Capacity of modified suction caissons in marine sand under static horizontal loading

2015 ◽  
Vol 102 ◽  
pp. 1-16 ◽  
Author(s):  
Dayong Li ◽  
Yukun Zhang ◽  
Lingyun Feng ◽  
Yufeng Gao
Keyword(s):  
Horizontal Loading ◽  
Marine Sand ◽  
Suction Caissons
Sign in / Sign up

Export Citation Format

Share Document