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基于太沙基极限承载力理论的管桩土塞高度计算方法 预览

Study on Calculation Method of Soil Plug Height of Pipe Pile Based on Terzaghi Ultimate Bearing Capacity
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摘要 为分析开口管桩沉桩过程中产生的土塞效应,首先从土塞的形成过程和作用机理出发,建立了土塞单元体的受力平衡方程,得出了垂直向总荷载的表达式;其次,将土塞视为"桩中桩",基于太沙基桩端极限承载力理论,得出"桩中桩"桩端极限承载力的表达式,从而导得管桩在沉桩过程中土塞高度的表达式;最后,将本文理论计算结果与工程实例进行对比分析,并进一步分析了径厚比、土的黏聚力以及桩土表面粗糙度对管桩沉桩过程中形成的土塞高度的影响,得出结论:同一入土深度,土塞高度随着径厚比增大而增大,随着桩土表面粗糙度的增加而减小,而土的黏聚力对土塞高度的影响不大.结果表明本文计算方法是基本可行的,对开口管桩沉桩过程中土塞高度的预测计算具有一定的参考价值. The objective of this study is to discuss the plugging effects of open-ended pipe pile. According to the formation process and mechanism of soil plug,the forced state of soil plug is analyzed, and the balance equation of unit plug is established. The expression of the total vertical load is also obtained. Moreover, the plug is regarded as a "pile in the pile",and then the formula of bearing capacity limit for pile end is reduced, based on the ultimate bearing capacity model theory that was put forward by Terzaghi K. Accordingly, the expression of the soil critical height in the process of driving is derived. Finally, the conclusion is drawn that these expressions are appropriate by comparing and analyzing the results of theoretical calculation and engineering examples, and the influence of the factors such as radius-thickness ratio, cohesion of soil and roughness of the surface between piles and soil are also discussed. It is concluded that the height of the soil increases with the increase of the radius-thickness ratio, and decreases with the increase of the surface roughness between piles and soil, but the cohesion of the soil has little effect on the height of the soil. The rationality of the formula has a certain reference value to predict the height of soil plug of open-ended pipe pile during jacking into soil.
作者 赵明华 肖容 杨超炜 肖尧 ZHAO Minghua, XIAO Rong, YANG Chaowei, XIAO Yao(Institute of Geotechnical Engineering, Hunan University, Changsha 410082, China)
出处 《湖南大学学报:自然科学版》 CSCD 北大核心 2018年第7期85-92,共8页 Journal of Hunan University(Naturnal Science)
基金 国家自然科学基金资助项目(51478178)
关键词 承载力 土塞效应 土塞高度 pipe foundations bearing capacity plugging effect soil plugheight
作者简介 通讯联系人赵明华(1956-),男,湖南洞口人,湖南大学教授,博士生导师,Email:mhzhaohd@21cn.com
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