No abstract

No abstract

Pile base resistance is an important part of the ultimate bearing capacity, and the soil within a certain range above and below the pile end contributes to the pile base resistance. In general, pile base resistance is calculated according to the average value of soil strength within a certain range of the pile end in the current calculating method, so it is very important to determine the influence range of pile base resistance. Based on the soil parameters and the results of the cone penetration test of the LiuHua 11-1 site in the South China Sea, the difference of pile base resistance calculated by different methods, the regularity of pile base resistance affected by calculation depth range is revealed. Additionally, the numerical simulation method is used to analyze the distribution of a plastic zone around the pile end in homogeneous soil and stratified soil, the results show the influence depth range of pile base resistance is 0.12 D above the pile end to 0.83 D below the pile end in clay, and the influence depth range is 0.9 D above the pile end to 1.3 D below the pile end in stratified soil.

In order to forecast the motion response of deepwater semi-submersible platform, frequency domain linear analysis method and time domain non-linear analysis method are currently widely used. Based on the introduction of the two methods, the difference analysis of the frequency domain method and the time domain method is carried out gradually. A deepwater semi-submersible platform's motion response example is given to clarify summarize the similarities, differences and numerical discipline forecasted by the two methods separately. The research provides the reference for forecasting the motion response of the platform in kind.