基于指數(shù)荷載傳遞模型的單樁承載力特性分析*
張亦靜，肖宏彬
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張亦靜，肖宏彬（湖南工業(yè)大學土木工程學院，株洲 412007）［摘要］在樁基模擬試驗的基礎上提出一種指數(shù)型樁身荷載傳遞模型，該指數(shù)模型所需參數(shù)只有兩個，且物理意義明確。引入該指數(shù)模型，并基于樁端荷載-位移關系為雙曲線的假設，推求了樁-土共同作用的微分方程，經過對方程進行求解，得到了單樁樁身荷載與沉降關系的解析解，進而得到樁頂?shù)暮奢d-位移曲線，可用于確定樁的承載力。工程實測結果與本文解析解結果的對比表明，較為吻合。［關鍵詞］荷載傳遞函數(shù)；荷載-沉降關系；指數(shù)函數(shù)中圖分類號：TU473文獻標識碼：A文章編號：1002-848X(2012)07-0119-04Analysis on bearing capacity of single pile based on exponential load transfer modelZhang Yijing, Xiao Hongbin(School of Civil Engineering, Hunan University of Technology, Zhuzhou 412007, China)Abstract: An exponential load transfer model of a pile was suggested based on a model pile test. The suggested model only requires two physically meaningful parameters. Using this equation and acknowledging a hyperbolic relationship between the pile-end bearing capacity and displacement, the differential equations of soil-pile interaction were derived. Such differential equations can be solved analytically to obtain the load-settlement curve that is important in determining the bearing capacity of the pile. The theoretical results are found in a good agreement with the experimental ones.Keywords: load transfer equation; load-settlement relation; exponential function*國家自然科學基金資助項目“膨脹土非線性流變特性研究”（50978097），湖南省自然科學基金資助項目“膨脹土固結與流變特性研究”（08JJ3092）。作者簡介：張亦靜，學士，副教授， Email：zyjww2004@163.com。參考文獻［1］CARRUBBA P. Skin friction of large-diameter piles socketed into rock［J］. Candian Geotechnical Journal, 1997，34(4)：230-240.［2］PRAKASH S，SHARMA H D. Pile foundations in engineering practice［M］. New York：John Wiley & Sons，Inc.，1990.［3］ASCHENBRENER T B，OLSON R E. Prediction of settlement of single pile in clay［C］//Proceedings of Symposium by ASCE Geotechnology，1984：41-58.［4］DUNCAN J M，CHANG C Y.Nonlinear analysis of stress and strain in soils［J］. Journal of the Soil Mechanics and Foundations Division, ASCE, 1970，96(5)：1629-1653.［5］MILOVIC D M，MILOVIC S D. Predicted and observed behaviour of piles［C］//International Seminar on Deep Foundations on Bored and Auger Piles (2nd)，1993：381-384.［6］GUO W D，RANDOLPH M F.Rationality of load transfer approach for pile analysis［J］.Computers and Geotechnics，1998，23(1)：85-112.［7］SEED H B，REESE L C. The action of soft clay along friction piles［J］. American Society of Civil Engineers Transactions，1955，122：731-754.［8］KRAFT L M，RAY R P，KAGAWA T. Theoretical τz curves［J］. Journal of the Geotechnical Engineering Division，ASCE，1981，107 (11)：1543-1561.［9］ZHU H，CHANG M F. Load transfer curves along bored piles considering modulus degradation ［J］. Journal of Geotechnical Engineering Division, ASCE， 2002，128(9)：764-774.［10］VIJAYVERGIYA V N. Load-movement characteristics of piles［C］//4th Symposium of Waterway，Port，Coastal and Ocean Division， ASCE，Long Beach：Calif.，1977：269-284.［11］KEZDI A.The bearing capacity of piles and pile groups［C］//Proceedings，4th International Conference on Soil Mechanics and Foundation Engineering，London，1957：46-51.［12］RANDOLPH M F，WROTH C P.Analysis of deformation of vertically loaded piles［J］. Journal of the Geotechnical Engineering Division，ASCE，1978，104(12)：1465-1487.［13］PELLS P J N，TURNER R M.Elastic solution for the design and analysis of rock-socketed piles［J］. Candian Geotechnical Journal，1997，34(3)：481-487.［14］劉杰，張可能，肖宏彬.考慮樁側土軟化時單樁荷載-沉降關系的解析算法［J］.中國公路學報，2003, 16(2)：61-64.［15］XIAO H B，LUO Q Z. Prediction of load-settlement relationship for large-diameter piles［J］. The Structural Design of Tall Buildings，2002，11(4)：241-258.［16］肖宏彬.豎向荷載作用下大直徑樁的荷載傳遞理論及應用研究［D］.長沙：中南大學，2005.
