南京工业大学学报（自然科学版）2018，Vol.40Issue(3)：67-72,6.DOI:10.3969/j.issn.1671-7627.2018.03.012
桩土接触面力学特性大型剪切试验
Large-scale shear test on mechanical characteristics of interface between pile and soil
摘要
Abstract
The performance of the lateral frictional resistance can be directly affected by the mechanical characteristics of soil-concreteinterface.Thus corrsesponding research is essential for the design and application of uplift pile.Based on the existing large-scales hear system and self-designed shear box,the precast concrete slabs were placed in the shear device to simulate the actual stress of pile body.Then,the test results were presented in aspect of shear stress-strain curves,interfacial shear strength and dilatancy characteristics.The results showed that the shear stress decreased linearly with the increase of shear displacement after reaching the peak value,and the decrease rate was approximately equal under different normal stresses.Further more,the maximum shear stress of the interface increased with the increase of normal stress and shows great linearity,but it decreased with the increase of water content.In addition,the shear strength of the interface decreased with the increase of water content,which was much lower than the soil shear strength under the same normal stress.Shear dilatancy occurred under smaller normal stress and lower water content,and under other conditions,it showed shear contraction.It can also be obtained that the higher normal stress can offer the larger shear contractions.关键词
接触面力学特性/剪切试验/含水率/抗剪强度/剪胀性Key words
mechanical behavior of interface/shear test/water content/shear strength/dilatancy分类
建筑与水利引用本文复制引用
熊彬涛,黄广龙,徐伟,张展宁..桩土接触面力学特性大型剪切试验[J].南京工业大学学报（自然科学版）,2018,40(3):67-72,6.基金项目
国家自然科学基金(41472283) （41472283）
