软土地基桩侧表面负摩阻力解析模型

考虑了桩土的相互作用，利用太沙基固结理论建立了桩侧表面负摩阻力非线性解析模型，在此基础上分析了软土地区桩倒表面负摩阻力的影响因素．结果表明，桩体特性、土体特性、桩土界面强度、堆载及土体结构性等对桩基负摩阻力均有不同程度的影响．为类似地层条件下桩基础承载力的设计提供有益参考．

An Analytical Model of Negative Skin Friction of Piles in Soft Soil

Based on the pile-soil interaction and Terzaghi consolidation theory, a nonlinear analytical model for negative skin friction of piles in soft soil was developed. An engineering example was calculated using this model, The fundamental load transfer properties and the relationships between negative skin friction and its main influence factors were analyzed. The results show that increasing the length, diameter, elastic modulus of piles and surcharge would enhance the downdrag of piles; while increasing the compress modulus of soils around piles, cutting down the mechanical strength of pile-soil interface or destroying structural strength of soils would reduce the downdrag of piles. The above results could help to design the capacity of piles in the similar areas.