超固结比对钢纤维混凝土能源桩力学特性影响试验研究  

Influence of over consolidation ratio on thermal-mechanical properties of energy pile in clay foundation

作　　者：常虹[1] 朱万里 谷复光[1] CHANG Hong;ZHU Wanli;GU Fuguang(College of Surveying and Exploration Engineering,Jilin Jianzhu University,Changchun 130118,China)

机构地区：[1]吉林建筑大学测绘与勘查工程学院,吉林长春130118

出　　处：《混凝土》2021年第8期146-149,共4页Concrete

基　　金：吉林省科技发展计划项目(20190303022SF)。

摘　　要：通过室内模型试验,对温度荷载作用下超固结比(OCR)对黏土地基能源桩热-力学特性的影响开展了研究。试验结果表明:黏土地基OCR越大热量传播的速度越慢,温度循环会导致桩顶产生累积沉降.任一深度处桩身的附加应力随温度升高而逐渐增大,随温度降低而减小,桩身各深度处应力随土体OCR的增加而逐渐增大,最大压应力发生在距填土表面2/3L处,降温阶段应力减小的速率随OCR的减小而降低。升温阶段桩体上部分产生负的侧摩阻力,下部分产生正的侧摩阻力,降温阶段正相反,桩侧摩阻力随土体OCR的增加而增大,中性点位于距填土表面2/3L深度处,在设计时要适当考虑。Based on the laboratory model tests,the effects of over-consolidation ratio(OCR)on thermal-mechanical properties of energy pile in clay foundation under temperature load were studied.The results show that in clay foundation the higher the OCR,the slower the heat transfer,the temperature cycle leads to the accumulationof the settlement at the pile head.The temperature stress at each depth of the pile gradually increases with the increase of OCR,the maximum compressive stress occurs at 2/3L from the surface of the fill.In the cooling stage the rate of stress reduction decreases with the decrease of OCR.In the heating stage,the negative lateral friction resistance will be generated along the upper part of the pile,while the positive lateral friction resistance occurs at the lower part produces,in the cooling stage,the lateral friction resistance is opposite,the pile lateral friction gradually increases with the increase of OCR,the neutral point is located at a depth of 2/3L from the surface of the fill,which should be properly considered in the design.

关 键 词：超固结比(OCR) 能源桩 温度荷载 力学特性 模型试验 

分 类 号：TU528.572[建筑科学—建筑技术科学]