不同材质腰梁对锚索预应力损失的影响研究  

Influence of Different Material Waist Beams on Anchor Cable Prestress Loss

作　　者：张启军 秘金卫 张昌太 闫楠[2] 李明 章伟[2] 陈吉光[4] 桑松魁 白晓宇[2] ZHANG Qi-jun;BI Jin-wei;ZHANG Chang-tai;YAN Nan;LI Ming;ZHANG Wei;CHEN Ji-guang;SANG Song-kui;BAI Xiao-yu(Qingdao Yegao Construction Engineering Co.,Ltd.,Qingdao 266042,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China;Shenzhen Oceanpower New Material Technology Co.,Ltd.,Shenzhen 518040,China;The Second Construction Limited Company of China Construction Eighth Engineering Division,Jinan 250014,China)

机构地区：[1]青岛业高建设工程有限公司,青岛266042 [2]青岛理工大学土木工程学院,青岛266520 [3]深圳海川新材料科技股份有限公司,深圳518040 [4]中建八局第二建设有限公司,济南250014

出　　处：《科学技术与工程》2023年第4期1665-1674,共10页Science Technology and Engineering

基　　金：国家自然科学基金(51778312,51708316);山东省自然科学基金重点项目(ZR2020KE009);中国博士后科学基金面上项目(2018M632641);山东省博士后创新项目(201903043)。

摘　　要：为研究不同材质腰梁对锚索预应力损失的影响规律,依托青岛海天中心桩锚支护深基坑工程,结合现场实测和ABAQUS有限元数值模拟,阐明了3种不同材质腰梁作用下锚索预应力变化规律,并将模拟结果与实测结果进行对比分析。结果表明:模拟结果与实测结果变化规律基本一致;锚索预应力随时间的变化趋势较平缓,分为快速下降、稳定变化和基本稳定3个阶段;加载过程中,锚索应力由自由段向锚固段传递,逐渐传递到支护桩及桩后土体;影响锚索预应力损失的主要因素为突然卸荷引起的锚索回缩、土体蠕变和岩土体流变变形。最后对比分析了玻璃纤维增强聚合物(glass fiber reinforced polymer,GFRP)腰梁、混凝土腰梁和钢腰梁作用下锚索预应力损失规律,整体损失率分别为6.89%、14.74%、16.84%,表明GFRP腰梁具有控制锚索预应力损失的绝对优势,研究成果可为类似深基坑工程的设计提供参考和借鉴。In order to study the influence law of waist beam with different materials on the prestress loss of anchor cable,based on the deep foundation pit supporting project of Qingdao Haitian Center pile anchor,combined with the field measurement and ABAQUS finite element numerical simulation,the variation law of anchor cable prestress under the action of waist beam with three different materials was clarified,and the simulation results were compared and analyzed with the measured results.The results show that the variation law of the simulated results is basically consistent with the measured ones.The change trend of anchor cable prestress with time is gentle,which can be divided into three stages:rapid decline,stable change and basic stability.In the loading process,the anchor cable stress is transferred from the free section to the anchorage section,and gradually transferred to the retaining pile and the soil behind the pile.The main factors affecting the prestress loss of anchor cable are anchor cable retraction,soil creep and rock mass rheological deformation caused by sudden unloading.Finally,the prestress loss rule of anchor cable under the action of glass fiber reinforced polymer(GFRP)waist beam,concrete waist beam and steel waist beam was compared and analyzed,and the overall loss rate is 6.89%,14.74%and 16.84%,respectively,indicating that GFRP waist beam has the absolute advantage of controlling the prestress loss of anchor cable.The research results can provide reference for the design of similar deep foundation pit projects.

关 键 词：预应力损失 玻璃纤维增强聚合物(GFRP)腰梁 深基坑工程 降温法 数值模拟 

分 类 号：TU473[建筑科学—结构工程]