不同工作荷载下能量桩热-力耦合特性模型试验  

Experimental of Thermal and Mechanical Coupling Characteristics of Energy Pile Under Different Working Loads

作　　者：何展朋 曹卫平[1,2] 赵敏[3] 李清源 张作鹏 HE Zhanpeng;CAO Weiping;ZHAO Min;LI Qingyuan;ZHANG Zuopeng(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;College of Civil Engineering and Architecture,Xi’an Technological University,Xi’an 710021,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学陕西省岩土与地下空间工程重点实验室,陕西西安710055 [3]西安工业大学建筑工程学院,陕西西安710021

出　　处：《土木工程与管理学报》2024年第4期83-91,共9页Journal of Civil Engineering and Management

基　　金：陕西省自然科学基础研究计划一般面上项目(2024JC-YBMS-299)。

摘　　要：本文通过黄土地基中能量桩在3种不同荷载工况下的温度循环荷载试验,以及在此基础上进行的能量桩竖向承载特性试验,对比分析了冷热循环过程中热交换效率、桩顶竖向荷载、桩土沉降、桩身轴力、桩侧摩阻力及桩端反力等变化规律。试验结果表明:桩顶竖向荷载随温度循环次数的增加而逐渐减小,桩顶沉降呈现出收敛特性;热循环时桩身受压,冷循环时受压区范围与工作荷载和冷循环次数成正比;桩顶工作荷载较小时,冷热循环对侧摩阻力的影响更大,冷循环时的侧摩阻力更大;工作荷载的大小是桩-土相对位移的控制因素;温度位移零点的位置与荷载大小无关,以此点为界冷热循环对侧摩阻力及桩-土相对位移有不同影响。In this paper,the temperature cyclic load tests of energy pile in loess foundation under three different load conditions were conducted.Based on this,the vertical load characteristics tests of energy pile were carried out,and the variation laws of heat exchange efficiency,pile top vertical load,pile soil settlement,pile axial force,pile side friction resistance and pile tip reaction were compared and analyzed.The test results indicate that the vertical load of the pile top decreases with the increase of temperature cycles,and the settlement of the pile top shows convergence.The pressure zone within the pile body during hot cycle is proportional to the working load and number of cold cycle.When the working load at the top of the pile is small,the cold and hot cycling have a greater influence on side friction resistance,with greater resistance during cold cycling.The size of working load is a controlling factor for relative displacement between piles and soil.The zero point of temperature displacement has different effects on lateral friction resistance and relative displacement between piles and soil during thermocycling.

关 键 词：能量桩 模型试验 黄土地基 冷热循环实验 桩顶沉降 

分 类 号：TU473.1[建筑科学—结构工程]