精轧螺纹钢抗浮锚杆荷载-位移特性及承载力预测  

Load-displacement Characteristics and Bearing Capacity Prediction on Anti-floating Anchor of Screw-thread Steel Bars

作　　者：杜焕龙 王忠胜 闫楠[1,2] 吕承禄 白晓宇 贾世祥[2] 孙淦 朱磊 王鹏 DU Huan-long;WANG Zhong-sheng;YAN Nan;L Cheng-lu;BAI Xiao-yu;JIA Shi-xiang;SUN Gan;ZHU Lei;WANG Peng(School of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China;Key Laboratory of Geological Safety of Coastal Urban Underground Space,Ministry of Natural Resources,Qingdao 266000,China;Qingdao Shiyun Construction Machinery Co.,Ltd.,Qingdao 266042,China;Jinan Municipal Engineering Design and Research Institute(Group)Co.,Ltd.,Jinan 250003,China;Jinan Energy Engineering Group Co.,Ltd.,Jinan 250000,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266520 [2]自然资源部滨海城市地下空间地质安全重点实验室,青岛266000 [3]青岛施运机械施工有限责任公司,青岛266042 [4]济南市市政工程设计研究院(集团)有限责任公司,济南250003 [5]济南能源工程集团有限公司,济南250000

出　　处：《科学技术与工程》2025年第8期3382-3390,共9页Science Technology and Engineering

基　　金：山东省自然科学基金重点项目(ZR2020KE009);国家自然科学基金(51708316);山东省泰山学者项目(tsqn202306234);自然资源部滨海城市地下空间地质安全重点实验室开放基金重点课题(BHKF2021Z09)。

摘　　要：基于青岛某基坑抗浮工程中9根精轧螺纹钢抗浮锚杆的现场拉拔破坏性试验,研究不同锚固长度下精轧螺纹钢抗浮锚杆的荷载-位移特性,明确精轧螺纹钢抗浮锚杆的承载性能。结果表明:相同直径的精轧螺纹钢抗浮锚杆,锚入中风化花岗岩3.0 m与3.5 m的锚杆其极限抗拔承载力为681 kN,锚入中风化花岗岩4.0 m的锚杆其极限抗拔承载力为1004 kN;加载初期,锚头位移呈线性增加,随荷载增加,锚头位移突增,均超过50 mm。双曲线函数与幂函数荷载-位移曲线模型与实测值在荷载水平较低时吻合度较好,临近破坏时吻合度相对较差,且极限抗拔承载力预测值较实测值偏差较大;指数函数荷载-位移曲线模型对本次试验锚杆的极限抗拔承载力预测精度较高,与实测值曲线吻合度较好。Based on the field pull destructive test of 9 anti-floating anchor of screw-thread steel bars in a foundation pit anti-float project in Qingdao,the load-displacement characteristics of anti-floating anchor of screw-thread steel bars under different anchoring lengths were studied,and the bearing performance of anti-floating anchor of screw-thread steel bars was determined.The results show that the ultimate uplift bearing capacity of the anti-floating anchor of screw-thread steel bars with the same diameter is 681 kN for the 3.0 m and 3.5 m anchors anchored in medium-weathered granite,and 1004 kN for the 4.0 m anchors anchored in medium-weathered granite.At the initial stage of loading,the displacement of anchor head increase linearly,and with the increase of load,the displacement of anchor head increase abruptly,all of which exceed 50 mm.The agreement between the hyperbolic function and the power function load-displacement curve model and the measured value is good when the load level is low,but is relatively poor when the failure is near,and the predicted ultimate tensile strength is much different from the measured value.The exponential function load-displacement curve model can predict the ultimate uplift bearing capacity of the test anchors with high accuracy and good agreement with the measured curve.

关 键 词：精轧螺纹钢筋 抗浮锚杆 极限抗拔承载力 荷载-位移(Q-s)曲线 函数模型 

分 类 号：TU473[建筑科学—结构工程]