膨胀土地基原型抗拔土体应力分析

Expansive soil body stress analysis of resisting pullout in prototype foundation

通过现场不同规格尺寸的上拔仿真型试验(即现场模型抗拔试验)、现场原型抗拔试验中出现的膨胀土破裂面及地表裂缝形式等现象,深入透彻地分析了膨胀土裂缝的产生机理,结合有限元计算方法,为邯石500 kV输电线路铁塔基础设计与施工提供依据。同时更准确地揭示了膨胀土中的大型抗拔基础的抗拔机理、填土及基础中的抗拔应力状态及破坏形态,对目前的一些流行观点和现行规范提出了自己的修订意见,为膨胀土地区原型设计提供参考,也为今后规范的编制提供有益的经验。

According to the phenomena in expansive soil fracture surface and the earth＇s surface crack shape of different standard ＆ size in model and scene prototype resisting pullout tests, the study has thoroughly and intensively analyzed the producing theory of expansive soil crack and has provided warrant for design and construction of 500 kV transmit electricity iron tower foundation from Handan to Shijiazhuang by finite element computing method. It has opened out better and true resisting theory, filling and resisting pullout stress state ＆ destroying form of expansive soil in large scale resisting pullout foundation at the same time point of view and existing criterion. It has offered gions and has also provided helpful experience for and has put forward the ideas to actual popularity reference for prototype design of expansive soil recompilation criterion for later reference.