当前位置：首页 > 过刊浏览->2025年第51卷S期
浅层气对海洋平台桩基承载力的影响评估研究
Impact assessment of shallow gas on bearing capacity of pile foundation of offshore platforms
浏览(230) 下载(2)
- DOI:
- 10.3969/j.issn.1001-2206.2025.S.003
- 作者:
- 邓海峰, 陈建强, 张梁
DENG Haifeng, CHEN Jianqiang, ZHANG Liang
- 作者单位:
- 1. 中国石油集团工程技术研究有限公司, 天津 300451;2. 中国石油集团海洋工程有限公司钻井分公司, 天津 300451
1. CNPC Engineering Technology Research Company Limited, Tianjin 300451, China;2. Drilling Branch of CNPC Offshore Engineering Company Limited, Tianjin 300451, China
- 关键词:
- 浅层气; 含气土; 桩基础; 导管架平台; 承载力
shallow gas;gas-bearing soil;pile foundation;jacket platform;bearing capacity
- 摘要:
海底浅层气的赋存对海洋平台桩基承载力及平台结构安全构成严重威胁，该问题超出常规规范覆盖范围，且国内外尚无明确解决方案。以API规范为基础，通过开展含气黏性土和粒状土（砂土、粉土）力学特性试验与分析研究，建立量化含气土影响的桩基承载力分析方法。试验结果表明，含气粒状土的强度随气压-水压差的增加呈线性降低，且密实度越低，气体影响越显著；在密实度相同情况下，围压对强度弱化程度无明显影响。气压-水压差较小时，含气黏性土的强度随气压的增加缓慢弱化，且呈线性规律，当气压-水压差超过某一界限值后，强度以非线性形式显著衰减。研究提出的含气土强度分析方法可以有效反映浅层气的不利影响，可为含气地层中桩基承载力评估及海洋平台安全验算提供依据。
The presence of shallow gas in the seabed poses a serious threat to the bearing capacity of pile foundation and structural safety of offshore platforms. This issue is beyond the scope of conventional specifications, and there is no clear solution domestically or internationally. Based on the API specification, a method for analyzing the bearing capacity of pile foundation, which quantifies the influence of gas-bearing soils, was established through experimental and analytical studies on the mechanical properties of gas-bearing cohesive soils and granular soils (sandy soils and silty soils). The test results show that the strength of gas-bearing granular soils decreases linearly with the increase in the air pressure-water pressure difference, and the lower the density, the more significant the gas influence; under the same density, the confining pressure has no obvious effect on the degree of strength weakening. When the air pressure-water pressure difference is small, the strength of gas-bearing cohesive soils weakens slowly with the increase in air pressure, which shows a linear law; when the air pressure-water pressure difference exceeds a certain threshold, the strength attenuates significantly in a nonlinear manner. The proposed strength analysis method for gas-bearing soils can effectively reflect the adverse effects of shallow gas, providing a scientific basis for the assessment of the bearing capacity of pile foundation in gas-bearing strata and the safety check of offshore platforms.