中文摘要：

为研究隧道锁脚锚管在端头竖向荷载作用下的受力特性,采用了一种隧道锁脚锚管受力特性的测试方法——应变片外贴导线内引的电测法,该方法克服了钢管表面贴片易损坏、引线困难等难题。以工程上经常使用的长为3.5 m、直径为42 mm、壁厚为4mm的热轧无缝钢管为例,系统介绍了测试锁脚锚管受力特性的试验设计方案,包括锁脚锚管管身轴向应变测试和管身弯矩测试。给出了锁脚锚管受力测试装置的设计与工艺,包括测力锚管的加工和温度补偿条的加工工艺。采用现场实测的方法,在某土质边坡对该方法进行了应用,将锁脚锚管安装在边坡土体中,然后在锁脚锚管端头加载,测试其受力状况。试验结果表明：锁脚锚管受力测试装置安设完毕后,测点成活率达到100%;锁脚锚管端头垂直加载,管身最终变形和试验测试结果相吻合;该试验方法能够真实反映锁脚锚管的受力特性。

英文摘要：

A new stress testing method for tunnel foot locking bolts,electric measuring method by externally bonded strain gauge,is adopted so as to study the stress characteristics of foot locking bolts under vertical load at bolt end. The stress testing design scheme of foot locking bolt,including strain test along axial line of foot locking bolt and bending moment test,is systematically introduced by taking widely used hot-rolling seamless tube of 3. 5 m in length,42 mm in diameter and 4 mm in thickness for example. The design and technologies for stress testing device of foot locking bolts,including manufacturing of dynamometry bolt and temperature compensation strip,are presented. In addition,the abovementioned method is applied by field test method at a soil slope. The testing results show that： 1） The monitoring points are all effective after installation of stress testing device. 2） The final deformation of foot locking bolt coincides with testing results under vertical loading at foot locking bolt end. 3） The above-mentioned method is reliable.