| 摘要: |
| 潮汐和波浪的长期反复水力作用必然对滩海人工岛粉细砂地基长期承载力产生影响，进而影响场地的运行安全。本文结合运行10年以上的某滩海人工岛粉细砂吹填地基，基于螺旋板载荷试验，首先研究标贯击数N、动探击数N120与地基承载力的关系，拟合其承载力经验公式，在此基础上综合分析粉细砂地基承载力现状，探究粉细砂地基长期承载力特性。研究结果表明，本文承载力拟合经验公式计算结果与实际地基承载力更为吻合；该粉细砂地基在经过10年以上运行后，地表以下16.0 m深度内承载力为252.7~406.8 kPa，相较原地基承载力有所提高；场地内长期反复的水力作用对粉细砂地基产生了正面影响，使得粉细砂进一步密实，长期承载力增强，有利于场地的运行安全。 |
| 关键词: 粉细砂地基 地基承载力 承载力经验公式 长期承载力 水力作用 运行安全 |
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| 基金项目:国家自然科学基金面上项目(52279135) |
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| Study on Long-Term Bearing Capacity Characteristics of Hydraulic Fill Silty Fine Sand Foundation in the Beach Sea Area |
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yangjie1, lijinglin1, sundaquan2, wangyanjun1, shaoshuai3,4
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1.Nanjing Hydraulic Research Institute;2.Nanpu Oilfield Operating Area of Jidong Oilfield;3.Nanjing R&4.D Tech Group Co. Ltd
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| Abstract: |
| The long-term repeated hydraulic action of tide and wave will inevitably affect the long-term bearing capacity of silty fine sand foundation of artificial island in beach sea, and then affect the operation safety of the site. Combined with the silty fine sand hydraulic fill foundation of a beach artificial island that has operated for more than 10 years, based on the spiral plate load test, this paper first studies the relationship between the standard penetration blow count N, dynamic sounding blow count N120 and the bearing capacity of the foundation, fits the empirical formula of its bearing capacity, and on this basis, comprehensively analyzes the current situation of the bearing capacity of the silty fine sand foundation, and explores the long-term bearing capacity characteristics of the silty fine sand foundation. The results show that the calculation results of the empirical formula of bearing capacity in this paper are more consistent with the actual bearing capacity of foundation; After more than 10 years of operation, the bearing capacity of the silty fine sand foundation in the depth of 16.0 m below the surface is 252.7~406.8 kPa, which is higher than that of the original foundation; The long-term repeated hydraulic action in the site has a positive impact on the silty fine sand foundation, which makes the silty fine sand more dense and enhances the long-term bearing capacity, which is conducive to the safe operation of the site. |
| Key words: silty fine sand foundation foundation bearing capacity long-term Bearing Capacity bearing capacity hydraulic action operation safety |
