Abstract
Compared to the traditional anchor cable, the constant resistance and large deformation anchor cable (constant resistance and large deformation anchor cable) has good applications in many fields of geotechnical engineering. Through the indoor static tension test, this study reveals the variation law of constant resistance, axial strain, the outer diameter of the sleeve, and the thermal effect of constant resistance and large deformation anchor cables during static tension. The ANSYS software was used for the first time to establish the nonlinear thermomechanical coupling analysis model of the finite element structure of constant resistance and large deformation anchor cables for the numerical calculation and analysis of static tension mechanical properties of constant resistance anchor cables. The experimental results that the average elongation of this batch of constant resistance anchor cables is 905 mm with an average elongation rate of 45.2% and an average constant resistance of 650 kN prove that constant resistance anchor cables are characterized by good constant resistance and large deformation, which can meet the requirements of deep soft rock roadway support and advanced landslide monitoring. The numerical simulation results show that the elongation of this type of anchor cables is 902 mm with an elongation rate of 45.1% and a constant resistance of 660 kN, which are basically consistent with the experimental results, indicating that numerical simulation is relatively accurate for testing the mechanical property of constant resistance and large deformation anchor cables, and the combination of the indoor test and numerical simulation provides the reference for engineering practice and design optimization of constant resistance and large deformation anchor cables.
Highlights
The anchor cable is a type of reliable and effective reinforced support materials
The conclusions of this study are as follows: 1. The static tension test measurement results show that this batch of constant resistance and large deformation (CRLD) anchor cables can maintain a constant resistance of 650 kN under the static tension conditions, and simultaneously, the tensile deformation rate reaches up to 45.2%, indicating that CRLD anchor cables are characterized by good CRLD
The CRLD anchor cable has overcome the drawbacks of invalid yield of traditional anchor cable material
Summary
The anchor cable is a type of reliable and effective reinforced support materials. It is anchored in the deep wall rock with the use of curved and flexible steel strands through pre-drilling for reinforcement. In 2009, He and colleagues[13,14,15] successfully developed a type of CRLD anchor cables characterized by constant resistance, breaking resistance, and large deformation, which is superior compared to traditional anchor cables in the related indoor test and site engineering application.[16,17,18,19,20,21,22] Because it can adapt to the rock-soil mass characterized by large deformation, it has achieved good effects in deep soft rock roadway support and open-pit mine landslide monitoring and pre-warning.[23,24,25] In engineering practice, the performance of CRLD anchor cables should be continuously improved and optimized to adapt to a variety of complex geological construction conditions and reinforcement requirements in practice. The advantages of ANSYS software in handling structural nonlinearity and multi-field coupling analysis It compares the constant resistance, axial strain, the outer diameter of the sleeve, thermal effect, and other aspects of anchor cables to provide reference for design optimization and on-site engineering practice of CRLD anchor cables.
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