多节钻扩混凝土桩扩径体间距对桩周土体位移影响试验研究  

Experimental study on influence of distance between expanded body of multi-section drilling and expansion concrete pile on soil displacement around pile

作　　者：徐丽娜[1] 李昊然 钱永梅[2] Tatenda Kelvin Gomba XU Lina;LI Haoran;QIAN Yongmei;Tatenda Kelvin Gomba(School of Transportation Science and Engineering,Jilin Jianzhu University,Changchun 130118,China;School of Civil Engineering,Jilin Jianzhu University,Changchun 130118,China)

机构地区：[1]吉林建筑大学交通科学与工程学院,长春130118 [2]吉林建筑大学土木工程学院,长春130118

出　　处：《建筑结构》2023年第23期144-148,154,共6页Building Structure

基　　金：国家自然科学基金项目:多节钻扩混凝土桩扩径体周围桩-土接触面力学特性及剪切模型研究(52008185)。

摘　　要：多节钻扩混凝土桩是一种新型的变截面桩,深入研究竖向荷载作用下多节钻扩混凝土桩桩周土体位移分布对准确掌握多节钻扩混凝土桩的承载特性具有重要意义。通过室内原状土小比例半截面桩模型试验,采用数码相机实时记录桩周土体在荷载作用下的变化规律,结合数字图像处理技术,获得桩周土体的位移规律和发展情况。试验结果表明:在破坏过程中双扩径体桩与单扩径体桩的桩周土体位移发展情况存在相同点,扩径体间距对双扩径体桩最终的破坏形式有较大的影响;荷载作用下,桩周土体的竖向位移较水平位移更加明显,并随着与桩体的距离和埋深的增加而逐渐减小;竖向位移和水平位移都随着扩径体间距的增大而呈现出逐渐减小的趋势。Multi-section drilling and expansion concrete pile is a new type of variable section pile.It is of great significance to study the distribution of soil displacement around multi-section drilling and expansion concrete pile under vertical load for grasping the bearing characteristics of multi-section drilling and expansion concrete pile.Based on the indoor model test of undisturbed soil small proportion half-section pile,the digital camera was used to record the change law of soil around the pile under load in real time,and combined with digital image processing technology,the displacement law and development of soil around the pile were obtained.The test results show that the soil development of double-expanded body pile and single expanded body pile is similar in the failure process,and the distance between expanded body has a great influence on the final failure mode of double-expanded body pile.Under load,the vertical displacement of soil around the pile is more obvious than the horizontal displacement,and gradually decreases with the increase of the distance from the pile and the buried depth.The vertical and horizontal displacements decrease gradually with the increase of the distance between expanded body.

关 键 词：多节钻扩混凝土桩 扩径体间距 数字图像处理技术 原状土 半截面桩 

分 类 号：TU473[建筑科学—结构工程]