摘要
采用基于数字图像相关技术的室内模型试验方法,对竖向荷载作用下螺杆桩的承载特性、桩周土体变形渐进发展规律开展研究。研究结果表明:螺杆桩Q-S曲线呈缓降型,螺杆桩整体承载力较等直径单桩提高近30%。螺杆桩桩周土体变形可以分为3个区域,即直杆段竖向变形区、螺纹段剪压变形区以及桩端孔穴扩张变形区。直杆段位移影响范围与等直径单桩基本一致;螺纹段位移影响范围约为2D,而等直径单桩约为D;桩端土体水平位移分布宽度明显大于等直径单桩,竖向位移沿深度方向渐进衰减。
The digital image correlation method is adopted in the model test to study the bearing characteristic and soil progressive deformation of half-screw pile under vertical load.The research results show that the load-settlement curve of half-screw pile descends gradually,the bearing capacity for half screw pile increases nearly 30 percent than single pile with same diameter.Soil deformation around halfscrew pile can be divided into three areas,which is vertical deformation zone at cylindrical part,shearcompression deformation at screwed part and the cavity expansion deformation zone beneath pile tip.The displacement influence range of cylindrical part is basically identically with single pile.Displacement influence range of screwed part is about 2D,while single pile with same diameter is about 1D,horizontal displacement distribution width beneath pile tip is significantly greater than single pile,vertical displacement beneath pile tip progressive decreases along the depth direction.
出处
《施工技术》
CAS
北大核心
2017年第14期116-119,共4页
Construction Technology
基金
国家自然科学基金(51408254)
江苏省自然科学基金青年项目(BK20130419)
江苏省高校自然科学研究项目(13KJB560002)
关键词
基础工程
模型
试验
位移
变形
foundations
model
testing
displacement
deformation
