大保高速挖孔灌注桩承载特性数值模拟  

Numerical Simulation of Bearing Capacity for Drilling Bored Piles in Da-Bao Highway

作　　者：董晓明[1] 谢永利[1] 董春晖[2] 

机构地区：[1]长安大学公路学院,西安610064 [2]山东交通职业学院,山东潍坊261206

出　　处：《南水北调与水利科技》2012年第4期81-85,共5页South-to-North Water Transfers and Water Science & Technology

基　　金：云南省交通科技重点资助项目(TST2007119A);国家西部交通建设科技项目(200331879750)

摘　　要：考虑到云南省境内不同地区气候类型多样、地形地貌多变、工程地质条件复杂等因素,采用大型有限元软件ADINA对云南省特殊条件下的人工挖孔灌注桩的桩顶沉降、桩身轴力、桩端阻力等工作机理和影响因素进行详细研究,并与现场数据加以对比,进行相互验证,结果显示:荷载-位移曲线基本分3个阶段;在桩土相互作用过程中,桩周土体呈现以桩为中心的"盆式"沉降状态;桩身轴力随深度传递的变化规律;桩端阻力随着桩顶荷载的增加不断增大,同时桩端的荷载分担比也不断增加。Under special local environment in Yunnan province with the diversity of climate types,complicated engineering geology condition,as well as uneven topography and relief,hand made excavation for cast in-situ piling,a large-scale finite-element software ADINA was applied to research the influencing factors and the working mechanism of manual hole digging pile,in aspect of pile cap subsidence,axial force transmission and end resistance.At last,the calculating results were compared with field data for verification each other.the conclusion is that load-displacement curve is basically divided into 3 stages.During pile-soil interaction process,the soil body around the pile subsides with a shape of basin type.Pile body axial force changes its patterns with depth transfer.Pile end resistance continues to increase with increasing pile cap load,and with increasing load sharing of pile ends.

关 键 词：人工挖孔灌注桩 轴力 桩端阻力 ADINA 工作机理 

分 类 号：U443.15[建筑科学—桥梁与隧道工程] TU457[交通运输工程—道路与铁道工程]