悬索桥锚碇基底岩石滑动摩擦系数快速测试装备研发与现场应用研究  

Research,Development and Application of Rapid Testing Equipment for Sliding Friction Coefficient of Anchorage Base Rock of Suspension Bridge

作　　者：励彦德 李剑 刘晓锋 黄志涵 张小龙 LI Yan-de;LI Jian;LIU Xiao-feng;HUANG Zhi-han;ZHANG Xiao-long(CCCC Highway Bridges National Engineering Research Centre Co.Ltd.,Beijing 100088,China;Guangdong Bay Area Transportation Construction Investment Co.Ltd,Guangzhou 511400,China;CCCC Second Highway Engineering Co.Ltd.,Xi'an 710065,China)

机构地区：[1]中交公路长大桥建设国家工程研究中心有限公司,北京市100088 [2]广东湾区交通建设投资有限公司,广州市511400 [3]中交第二公路工程局有限公司,西安市710065

出　　处：《公路》2024年第12期180-190,共11页Highway

摘　　要：从动量矩定理出发,推导了可变正压力的基岩与混凝土滑动摩擦系数计算理论公式,通过测量混凝土滑块与地面的接触正压力和摆臂角度,可实现滑动摩擦系数的精确计算。通过对预载弹簧、高频测力传感器、光电解码器、工控主机的开发与集成,实现对测试数据的高精度采集、分析与展示,完成了装备开发。使用室内大型直剪试验对装备进行标定,测试偏差小于2%。依托狮子洋大桥东、西锚碇项目开展现场应用测试。测试结果表明,新装备测试结果与现场直剪试验偏差<3%,测试精度高,用时节省95%以上,测试速度快。Based on the theorem of moment of momentum,a theoretical formula for calculating the sliding friction coefficient between bedrock and concrete with variable positive pressure is derived.By measuring the contact positive pressure and swing arm angle between the concrete slider and the ground,accurate calculation of the sliding friction coefficient can be achieved.By developing and integrating preloaded springs,high-frequency force sensors,optoelectronic decoders,and industrial control hosts,high-precision collection,analysis,and display of test data have been achieved.The equipment is calibrated using indoor large-scale direct shear tests,with a test deviation of less than 2%.On-site application testing is conducted based on the east and west anchorage projects of the Shiziyang Bridge.The test results show that the deviation between the new equipment test results and the on-site direct shear test is less than 3%with high test accuracy,and the time is saved by over 95%,the test speed being fast.

关 键 词：桥梁工程 狮子洋大桥 锚碇 基岩 滑动摩擦系数 快速测试装备 大型直剪试验 

分 类 号：U443.24[建筑科学—桥梁与隧道工程] U446.2[交通运输工程—道路与铁道工程]