工程地质学报Issue(6)：857-863,7.
湿陷性黄土模型试验相似材料研制与单桩负摩阻力模型试验研究
DEVELOPMENT OF SIMILAR MODEL MATERIAL OF COLLAPSIBTE LOESS AND RESEARCH ON NEGATIVE SKIN FRICTION OF PILE FOUN-DATION IN COLLAPSIBLE LOESS REGION
摘要
Abstract
The model test material of collapsible loess is the bottleneck of similar material model research in geo-mechanics,which has limited application of model tests in loess area.A similar material of model test for collapsible loess is developed by airfall technique based on Monte Carlo method.A single pile foundation model test is carried out to investigate the negative skin friction of the pile under the effect of self-weight collapsibility.The research re-sults show that the axial force along the pile of different time roughly appeared as the shape of“B”.The neutral point is located between the modeled collapsible soil and sands.The settlement of the top of pile is far less than col-lapse deformation of the soil due to the effect of self-weight collapsibility.The negative frictional resistance of the pile increases along the depth and reaches the peak at the neutral point.The frictional resistance along the pile roughly appears as the shape of“D”when immersing water for 1 hour.Through out the testing phase,the negative friction reaches a second peak and the curve distributes as the shape of“β”.The settlement of the top of pile is a-bout 0.54mm due to the frictional resistance.The experimental research methods and results can provide references for similar projects.关键词
湿陷性黄土/空中自由下落技术/相似材料/负摩阻力Key words
Collapsible loess/Airfall method/Similar material/Negative skin friction分类
建筑与水利引用本文复制引用
张延杰,王旭,梁庆国,蒋代军,蒋鹏程..湿陷性黄土模型试验相似材料研制与单桩负摩阻力模型试验研究[J].工程地质学报,2013,(6):857-863,7.基金项目
长江学者和创新团队发展计划（IRT1139），国家自然科学基金项目（41262010）资助． （）
