(1 东北大学资源与土木工程学院，沈阳 110004； 2 沈阳建筑大学土木工程学院，沈阳 110168；3 辽宁省建筑设计研究院，沈阳 110005)

［摘要］通过对大量的现场试验数据和观测资料进行统计分析, 论述了墩式基础的受力机理,指出了粘性土地基墩式基础破坏模式不同于砂土地基的压密式渐近破坏。 提出了持力层为粘性土时的单墩竖向承载力计算公式, 并分别给出了墩端土和墩周土的承载力调整系数。 根据对比试验结果,墩底形状为平底时对墩端土承载力的发挥最有利。 基础底面尺寸效应对墩式基础的承载力有显著影响, 随着墩底直径增大, 调整系数呈降幂指数规律衰减。

［关键词］墩式基础；粘性土地基；承载力；尺寸效应；调整系数

Research on bearing capacity test of pier foundation on cohesive soil

Liu Zhongchang^1，3，Zhu Fusheng^1，2，Shu Zhaoran³，Yu Dan²

(1 School of Resources & Civil Eng. Northeast Univ., Shenyang 110004, China； 2 School of Civil Eng., Shenyang Jianzhu Univ., Shenyang 110168,China; 3 Building Design and Research Dep. of Liaoning Province, Shenyang 110005, China)

Abstract:The mechanism and an empirical formulation of vertical bearing capacity of non-reinforced concrete pier in cohesive soil are proposed based on field load testing data of piers. In the proposed formulation, the adjustment coefficient of both the end bearing and skin friction of the piers are given. The testing results show that a belled pier with flat end would have the largest end bearing capacity comparing with other end shape of belled piers. The results show that the size effect of end of belled pier has a significant influence on the bearing capacity of pier.

Keywords:pier foundation; cohesive soil; bearing capacity; scale effect; adjusting coefficient

辽宁省自然科学基金(20021008)，辽宁省科技攻关项目。