基于法国规范的重力式码头基础换填砂垫层振冲标准
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摘要
对于换填砂垫层的振冲验收标准,国内项目的常规要求是标准贯入击数N≥15击,但缺少理论计算。针对该问题,通过分析和研究法国规范及其他相关资料,总结出基于法国规范的换填砂垫层振冲验收标准的计算方法。结合国外某大型重力式码头项目实例,计算得出适合的标准贯入击数N为22击。标准贯入击数与内摩擦角或极限应力的关系是计算的核心。对于大型重力式码头,船舶大型化以及新设备、新技术的出现,适当提高砂垫层振冲标准,有利于提高地基承载力、控制地基沉降。
For the projects in China,the vibration standard of replacing sand bedding is standard penetration test blow count N≥15.However,the above standard is lack of theory calculation.In order to solve this problem,we analyze and research French norms and other relevant documents,carry out a method of calculating the vibration standard of replacing sand bedding following the French norms. Based on a foreign project,the calculation results show that the suitable SPT N of replacing sand bedding for large-scale gravity wharf is not less than 22. The relationship between SPT N and angle of shearing resistance or limited pressure is the core of calculation. As the trend of larger-sized vessel and appearance of new equipment and new technique for large-scale gravity wharf,increasing the vibration standard of sand bedding appropriately is beneficial to improve the bearing capacity and control the settlement.
For the projects in China,the vibration standard of replacing sand bedding is standard penetration test blow count N≥15.However,the above standard is lack of theory calculation.In order to solve this problem,we analyze and research French norms and other relevant documents,carry out a method of calculating the vibration standard of replacing sand bedding following the French norms. Based on a foreign project,the calculation results show that the suitable SPT N of replacing sand bedding for large-scale gravity wharf is not less than 22. The relationship between SPT N and angle of shearing resistance or limited pressure is the core of calculation. As the trend of larger-sized vessel and appearance of new equipment and new technique for large-scale gravity wharf,increasing the vibration standard of sand bedding appropriately is beneficial to improve the bearing capacity and control the settlement.
引文
[1] Ministère de l'Equipement du Logement et des Transports.Règles techniques de conception et de calcul des fondations des ouvrages de génie civil:FASCICULE N°62-Titre V[M].Pairs:Eyrolles,1993.
[2]中交第四航务工程局有限公司,中交四航局港湾工程设计院有限公司.重力式码头设计与施工规范:JTS167-2—2009[S].北京:人民交通出版社,2009.
[3]中交天津港湾工程研究院有限公司.港口工程地基规范:JTS 147-1—2010[S].北京:人民交通出版社,2010.
[4] GONIN H,VANDANGEON P, LAFEUILLADE M P.Etude sur les corrélations entre le standard penetration test et le pressiomètre[J]. Revue Fran9aise de géotechnique,1992,58:67-78.
[5] Centre Scientifique et Technique du Batiment. Règle pour le calcul des foundations superficielles:DTU 13. 12[S].Pairs:AFNOR,1988.
[6] TOMLINSON M, WOODWARD J. Pile design and construction practice[M].London:Taylor&Francis,2008.
[2]中交第四航务工程局有限公司,中交四航局港湾工程设计院有限公司.重力式码头设计与施工规范:JTS167-2—2009[S].北京:人民交通出版社,2009.
[3]中交天津港湾工程研究院有限公司.港口工程地基规范:JTS 147-1—2010[S].北京:人民交通出版社,2010.
[4] GONIN H,VANDANGEON P, LAFEUILLADE M P.Etude sur les corrélations entre le standard penetration test et le pressiomètre[J]. Revue Fran9aise de géotechnique,1992,58:67-78.
[5] Centre Scientifique et Technique du Batiment. Règle pour le calcul des foundations superficielles:DTU 13. 12[S].Pairs:AFNOR,1988.
[6] TOMLINSON M, WOODWARD J. Pile design and construction practice[M].London:Taylor&Francis,2008.