Research on mechanical property and engineering application of cable with high constant resistance and large deformation

Abstract

In recent years, the intensity and frequency of landslide geological disasters have been increasing year by year.In the process of landslide occurrence, the traditional prestressed anchor cable can not resist the large deformation of rock and cause problems such as breaking and failure.In response to the above problems, three different types of high-resistance large deformation anchor cables (NPR anchor cables) have been independently developed.Its core structure consists of a constant resistance device connected with a traditional anchor cable.Then, through the field static tensile test, it is confirmed that the cable can provide a maximum working resistance of 850 kN and a large deformation of 2 000 mm.Secondly, using STATIC and GENERAL quasi-static analysis method in ABAQUS, the numerical simulation analysis of the stress-strain characteristics of the constant resistance device under static tension is carried out.The analysis results prove that the NPR anchor cable stretching process is a process of constant resistance and energy absorption.Finally, through field application, it is verified that the NPR anchor cable structure can be deformed greatly with the instability of the slope, which avoids the traditional anchor cable being broken due to large deformation.It achieves the goal of intelligent integration of landslide hazard prevention, monitoring and forecasting and provides a scientific basis for reasonably explaining the relationship between the law of landslide migration and the monitoring and early warning curve.

Keywords

• constant resistance and large deformation anchor cable
• numerical simulation analysis
• negative poisson's ratio
• static tensile