COUPLING EFFECT ANALYSIS OF TENSION AND REVERSE TORQUE DURING AXIAL TENSILE TEST OF ANCHOR CABLE

Abstract

In view of lack of the coupling effect analysis of tension and reverse torque of the anchor cable, the self-developed equipment was used to perform a tensile test on the anchor cables with three different diameters (9.5 mm, 12.7 mm, 15.2 mm) under free rotation and without rotation conditions. Then the three-dimension numerical model of the anchor cable was built, the process of the axial tension test was simulated and the computational results were consistent with experimental results. Based on the work and energy principle, a formula for the tensile force is proposed for the decoupling tensile and reverse torque of the anchor cable. Results show that the peak tension and peak torque both increase with the diameter of the anchor cable, and the effect of the locking length on the peak tension and torque is not obvious. The anchor cable will generate reverse torque when it is pulled without rotation, the torque change process is divided into the elastic and plastic phases, the torque in the elastic phase increases linearly with the increase of the tensile force, while the torque in the plastic phase remains stable and the tensile force increases slightly. Under the condition of free rotation, the elastic modulus of the anchor cable will decrease, the percentage of the pulling force used for untwisting of three different diameter cables (9.5 mm, 12.7 mm, 15.2 mm) were 11%, 12%, and 10%, respectively. The conclusions obtained in the study can provide a reference to direct the similar engineering practice. Keywords: Anchor cable, Tensile test, Tension-torsion coupling, Mechanical properties, Numerical simulation