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- 2016
黏土中桶形基础负压下沉阻力及土塞发展试验
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Abstract:
桶形基础负压下沉时下沉阻力和土塞发展是桶形基础施工中的两个关键性问题．针对此问题, 进行了不同土体中桶形基础下沉特性的模型试验, 测量试验过程中土塞隆起高度、桶体下沉位移及施加负压值的大小．试验结果表明, 当施加的负压大于所需负压时桶体才会下沉, 并且土塞是阻碍桶体下沉的最主要原因．在负压下沉过程中, 土塞隆起参数分别为74% 和105% , 并且当反向地基承载力破坏发生时, 更多土体将会进入桶内．在实际工程中, 桶内土塞的发展应作为负压下沉时施工控制的关键技术指标, 并且需要对其进行实时监控, 避免施工上的困难和对桶体稳定性的影响．
Penetration resistance and soil plug development are two critical issues in construction during suction caisson penetration. Aiming at these problems，model tests were carried out to study the behavior of suction caisson penetration in different types of soils. The height of soil plug，displacement of suction caisson and applied suction pressure are measured during the model tests. The model tests show that the caisson began to install when the applied suction was greater than the required underpressure，and the soil plug is one of the key factors that interrupted the penetration process of caisson. During the process of suction penetration，the soil plug parameters were 74% and 105% respectively，and more volume of soil would enter the caisson when the reverse bearing failure occurs. In practical construction，the development of soil plug inside caisson should be used as a key technical index during suction penetration construction. Moreover，to avoid difficulties in construction and instability of suction caisson，real-time monitoring should be carried out on soil plug heave
| [1] | 闫澍旺, 霍知亮, 孙立强, 等. 海上风电机组筒型基础工作及承载特性研究[J]. 岩土力学, 2013, 34(7):2036-2042. |
| [2] | Yan Shuwang, Huo Zhiliang, Sun Liqiang, et al. Study on working mechanism and bearing capacity behavior of bucket foundation for offshore wind turbine [J]. <i>Rock and Soil Mechanics</i>, 2013, 34(7):2036-2042(in Chinese). |
| [3] | Zhang Puyang, Xiong Kangping, Ding Hongyan, et al. Anti-liquefaction characteristics of composite bucket foundations for offshore wind turbines [J]. <i>Journal of Renewable and Sustainable Energy, AIP</i>, 2014, 6(5):053102. |
| [4] | 张伟, 王晖, 孙克俐. 桶形基础承载力的三维弹塑性有限元分析[J]. 天津大学学报, 2009, 42(12):1041-1047. |
| [5] | 王晖, 王乐芹, 周锡？i, 等. 软黏土中桶形基础的上限法极限分析模型及其计算[J]. 天津大学学报, 2006, 39(3):273-279. Wang Hui, Wang Leqin, Zhou Xireng, et al. Limit analysis and calculation for bucket foundation embedded in soft clay based on the upper-bound theorem [J]. <i>Journal of Tianjin University</i>, 2006, 39(3):273-279(in Chinese). |
| [6] | 国振, 王立忠, 袁峰. 黏土中吸力锚沉贯阻力与土塞形成试验研究[J]. 海洋工程, 2011, 29(1):9-17. |
| [7] | Dyvik R, Andersen K H, Hansen S B, et al. Field tests of anchors in clay I:Deseription [J]. <i>Journal of Geotechnical Engineering</i>, <i>ASCE</i>, 1993, 119(10):1515-1531. |
| [8] | Houlsby G T, Byrne B W. Design procedures for installation of suction caissons in clay and other materials [J]. <i>Geotechnical Engineering</i>, 2005, 158(2):75-82. |
| [9] | Rauch A F, Olson R E, Luke A M, et al. Measured response during laboratory installation of suction caissons [C]//<i>Proceedings of the</i> 13<i>th International Offshore and Polar Engineering Conference</i>. Honolulu, USA, 2003:25-30. |
| [10] | Andersen K H, Jeanjean P, Luger D, et al. Centrifuge tests on installation of suction anchors in soft clay[J]. <i>Ocean Engineering</i>, 2005, 32(7):845-863. |
| [11] | Hansen J B. A revised and extended formula for bearing capacity[R]. Danish Geotechnical Institute Bulletin, 1970. |
| [12] | Guo Z, Wang L, Yuan F, et al. Model tests on installation techniques of suction caissons in a soft clay seabed [J]. <i>Applied Ocean Research</i>, 2012, 34:116-125. |
| [13] | Tjelta T I. Suction piles:Their position and applications today[C]//<i>Proceedings of the</i> 11<i>th International Offshore and Polar Engineering Conference</i>. Stavanger, Norway, 2001:17-22. |
| [14] | 杨少丽, Lars Grande, 齐剑峰, 等. 桶基负压沉贯下粉土中水力梯度的变化过程[J]. 岩土工程学报, 2003, 25(6):521-524. |
| [15] | Villalobos F A, Byrne B W, Houlsby G T. Model testing of suction caissons in clay subjected to vertical loading[J]. <i>Applied Ocean Research</i>, 2010, 32(4):414-424. |
| [16] | Chen W, Zhou H, Randolph M F. Effect of installation method on external shaft friction of caissons in soft clay [J]. <i>Journal of Geotechnical and Geoenvironmental Engineering</i>, 2009, 135(5):605-615. |
| [17] | Zhang Wei, Wang Hui, Sun Keli. Three-dimensional elasto-plastic FEM analysis of bearing capacity of bucket foundation [J]. <i>Journal of Tianjin University</i>, 2009, 42(12):1041-1047(in Chinese). |
| [18] | Senpere D, Auvergne G A. Suction anchor piles―A proven alternative to driving or drilling [C]//<i>Proceedings of Offshore Technology Conference</i>, <i>OTC</i>4206. Houston, USA, 1982:483-494. |
| [19] | Yang Shaoli, Lars Grande, Qi Jianfeng, et al. Process of hydraulic gradient in silt during penetration of bucket by suction[J]. <i>Chinese Journal of Geotechnical Engineering</i>, 2003, 25(6):521-524(in Chinese). |
| [20] | Guo Zhen, Wang Lizhong, Yuan Feng. An experimental investigation of insertion resistance and soil heave during caisson installation in soft clay [J]. <i>The Ocean Engineering</i>, 2011, 29(1):9-17(in Chinese). |
| [21] | Andersen K H, Dyvik R, Lauritzsen R, et al. Model tests of gravity Platforms Ⅱ:Interpretation [J]. <i>Journal of Geotechnical Engineering, ASCE</i>, 1989, 115(11):1550-1568. |
| [22] | DNV-RP-E303. Geotechnical Design and Installation of Suction Anchors in Clay [S]. Det Norske Veritas, 2005. |
| [23] | API-RP-2SK. Recommended Practice for Design and Analysis of Stationkeeping Systems for Floating Structures [S]. American Petroleum Institute, 2005. |
| [24] | Whittle A J, Germaine J T. Behavior of miniature suction casissons in clay[C]//<i>Proceedings of Offshore Site Investigation and Foundation Behaviour</i>. London, UK, 1998:279-300. |
| [25] | Zhou H, Randolph M F. Large deformation analysis of suction caisson installation in clay[J]. <i>Canadian Geotechnical Journal</i>, 2006, 43(12):1344-1357. |
| [26] | Huang J, Cao J, Audibert J M E. Geotechnical design of suction caisson in clay[C]<i>//Proceedings of the</i> 13<i>th International Offshore and Polar Engineering Conference, ISOPE</i>. Honolulu, USA, 2003:770-779. |
| [27] | Fuglsang L D, Steensen-Bach J O. Breakout resistance of suction piles in clay[C]//<i>Proceedings of the International Conference</i>:<i>Centrifuge</i>. Rotterdam, The Netherlands, 1991:153-159. |
| [28] | Clukey E C, Morrison M J. A centrifuge and analytical study to evaluate suction caissons for TLP applications in the Gulf of Mexico [C]//<i>Proceedings of Design and Performance of Deep Foundations</i>:<i>Piles and Piers in Soil and Soft Rock</i>. Dallas, USA, 1993:141-156. |
| [29] | House A R, Randolph M F. Installation and pull-out capacity of stiffened suction caissons in cohesive sediments[C]//<i>Proceedings of the</i> 11<i>th International Offshore and Polar Engineering Conference</i>. Stavanger, Norway, 2001:574-580. |
