界面粗糙度对桩土界面剪切特性的影响研究  

Experimental Investigation on the Influence of Surface Roughness on Shear Behavior of Soil-pile Interface

作　　者：王佳 曾国东 成浩[2] WANG Jia;ZENG Guodong;CHENG Hao(Foshan Road and Bridge Supervision Station Corporation Limited,Foshan,Guangdong 528041,China;College of Civil Engineering,Central South University,Changsha,Hunan 410075,China)

机构地区：[1]佛山市公路桥梁工程监测站有限公司,广东佛山528041 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《公路工程》2018年第5期205-208,247,共5页Highway Engineering

基　　金：广东省交通运输厅科技项目(2013-02-003)

摘　　要：为了研究桩侧表面粗糙度对桩土接触面力学特性的影响,进行了砂土与不同粗糙表面混凝土板的大型直剪试验,分析粗糙度对桩土接触面力学特性的影响。试验结果表明:砂土-混凝土接触面剪切应力-位移曲线表现为理想弹塑性型,界面粗糙度的增加能明显提高接触面的剪切强度,但随着法向应力的增大,粗糙度对接触面剪切强度的影响逐渐减弱。接触面的剪切破坏符合摩尔库伦强度准则;粗糙度的增大能明显提高接触面的黏聚力,但是对接触面摩擦角的影响很小。To investigate the effects of surface roughness of pile on shear behavior of soil-pile interface,a series of large direct shear tests were performed on sand-concrete interface with different surface roughness.The influence of roughness on interfacial strength parameters is obtained further.The tests results show that the shear stress-shear displacement curves of sand-concrete interface are characterized as ideal elasto-plastic.The peak shear stress of interface distinctly increase with increasing surface roughness,but the influence of roughness on the peak shear stress weaken under a higher normal stress.The shear failure of interface agrees well with the Mohr-Coulomb strength failure criterion.The increasing roughness can remarkably increase the cohesion of interface,but has little influence on internal friction angle of interface.

关 键 词：桩土接触面 粗糙度 大型直剪试验 砂土 

分 类 号：TU44[建筑科学—岩土工程]