Risk and Preventive Measures of Pile Placement in Chengdao Oilfield

doi:10.16183/j.cnki.jsjtu.2023.S1.09

Abstract

Abstract:

Chengdao Oilfield is located in the modern Yellow River underwater delta, where the seabed strata are complex, and the sediment silt and silty clay have great interbedding changes. In recent years, an increasing number of jack-ups are installed and removed in the same wellhead or similar wellhead. There are risks of sliding pile, punch-through, and liquefaction and subsidence in the area where piles are repeatedly inserted and pulled out on offshore moving platform. Aimed at the risks, preventive measures are analyzed to reduce the risk of pile driving on jack-up platforms.

Key words: Chengdao Oilfield, piles repeatedly inserted and pulled, sliding pile, punch-through, liquefaction and subsidence

CLC Number:

P751

AN Tao, LIN Zengyong, ZHANG Da. Risk and Preventive Measures of Pile Placement in Chengdao Oilfield[J]. Journal of Shanghai Jiao Tong University, 2023, 57(S1): 25-29.

Figures/Tables 3

Tab.1

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References 13

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土层编号	土层名称	深度/m	水下重度/ (kN·m^-3)	黏性土设计抗剪强度/kPa	粒状土设计抗剪强度,Φ/(°)	承载力系数
土层编号	土层名称	深度/m	水下重度/ (kN·m^-3)	黏性土设计抗剪强度/kPa	粒状土设计抗剪强度,Φ/(°)	N_q	N_r
1	粉土	0.0~2.1	7.5~9.5		13~18	3.9	2.6
2	粉土	2.1~7.1	8.5~10.5		25~28	10.7	10.9
3	粉砂	7.1~8.0	8.5~10.5		27~30	14.7	16.7
4	粉质黏土	8.0~11.2	8.0~10.0	42.2~65.6
5	粉土	11.2~14.6	8.5~10.5		27~30	14.7	16.7
6	粉砂	14.6~17.8	8.5~10.5		27~30	14.7	16.7
7	粉质黏土	17.8~19.1	8.0~10.0	57.6~85.8
8	粉土	19.1~20.0	8.5~10.5		28~32	18.4	22.4

土层编号	土层名称	深度/m	水下重度/ (kN·m^-3)	黏性土设计抗剪强度/kPa	粒状土设计抗剪强度,Φ/(°)	承载力系数
土层编号	土层名称	深度/m	水下重度/ (kN·m^-3)	黏性土设计抗剪强度/kPa	粒状土设计抗剪强度,Φ/(°)	N_q	N_r
1	淤泥	0.0~0.8	6.0~7.0	5.6~10.2
2	粉土	0.8~3.0	8.0~9.0		13~18	3.9	2.6
3	杂填土	3.0~5.4	8.0~9.0		13~18	3.9	2.6
4	粉土	5.4~7.6	8.5~9.5		23~27	10.7	10.9
5	粉砂	7.6~8.7	9.5~10.5		25~30	14.7	16.7
6	粉土	8.7~16.8	9.5~10.5		25~30	14.7	16.7
7	粉质黏土	16.8~18.1	10.0~11.0	53.4~86.5
8	粉土	18.1~20.0	10.0~11.0		28~32	18.4	22.4

土层编号	土层名称	深度/m	水下重度/ (kN·m^-3)	黏性土设计抗剪强度/kPa	粒状土设计抗剪强度,Φ/(°)	承载力系数
土层编号	土层名称	深度/m	水下重度/ (kN·m^-3)	黏性土设计抗剪强度/kPa	粒状土设计抗剪强度,Φ/(°)	N_q	N_r
1	粉土	0.0~2.5	7.2~7.9		13~18	3.9	2.6
2	粉土	2.5~3.2	8.0~9.0		18~22	6.4	5.4
3	粉质黏土	3.2~5.2	8.0~9.0	35.2~52.6
4	粉土	5.2~10.6	9.3~10.3		25~30	14.7	16.7
5	粉砂	10.6~17.2	9.8~10.5		25~30	14.7	16.7
6	粉质黏土	17.2~18.6	10.3~10.8	58.6~83.5
7	粉土	18.6~20.0	10.3~10.8		28~32	18.4	22.4

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