土岩二元基坑不同材质腰梁对锚索预应力损失的影响规律研究  

Study on influence law of waling with different materials on prestress loss of anchor in dualistic layer of soil and rock in deep excavation

作　　者：秘金卫 白晓宇[1] 闫楠[1] 刘作岩 章伟[1] Bi Jinwei;Bai Xiaoyu;Yan Nan;Liu Zuoyan;Zhang Wei(School of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China;Qingdao Zhongjian United Group Co.,Ltd.,Qingdao 266100,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266520 [2]青岛中建联合集团有限公司,山东青岛266100

出　　处：《工程勘察》2024年第1期9-13,共5页Geotechnical Investigation & Surveying

基　　金：山东省自然科学基金重点项目(ZR2020KE009);国家自然科学基金资助项目(51708316);山东省博士后创新项目(201903043);山东省高等学校科技计划项目(J16LG02).

摘　　要：为研究土岩二元基坑不同材质腰梁对锚索预应力损失影响的时变规律,本文依托青岛某土岩基坑工程,开展了GFRP腰梁和双背槽钢腰梁作用下的锚索预应力损失监测的现场试验。研究结果表明:两种材质的腰梁各具优势,GFRP腰梁对锚索短期预应力损失更有利,而双背槽钢腰梁长期损失率更低;双背槽钢腰梁作用下锚索预应力变化趋势更加平缓,浮动范围更小;GFRP腰梁可以有效减少锚索预应力在快速下降阶段的预应力损失量。研究成果可为类似地质条件下基坑支护设计、施工和监测提供参考和借鉴。In order to study the influence law with time of waling with different materials on the prestressing loss of anchor in soil-rock dualistic strata in excavation pit,the field tests to monitor the force loss of prestressed anchor under the action of GFRP(Glass Fiber Reinforced Plastic)waling and double U-shaped steel waling were carried out in a soil-rock composite strata excavation project in Qingdao.The results show that the two kinds of waling have their own advantages.GFRP waling is more favorable to the stress loss in short-term,while the long-term loss rate of double U-shaped steel waling is lower;under the action of double U-shaped steel waling,the stress of anchor changes more gently and the varying range is smaller;GFRP waling can effectively reduce the stress loss of anchor in the rapid decline stage.The study results can provide a reference for the excavation support design,construction and monitoring under similar geological conditions.

关 键 词：预应力锚索 土岩二元基坑 GFRP腰梁 预应力损失 

分 类 号：TU473[建筑科学—结构工程]