There is an increasing need to determine accurately the strength properties of tendons for an effective ground control on mines and underground structures as well as on modelling simulations. The strength properties of cables, used as cable bolts, have been evaluated mainly by their ultimate tensile strength, as this kind of test can be carried out in the field as well as in the laboratory. Onl...

In the present paper, a new type of surface-bonded fiber Bragg grating (FBG) dynamometry bolt is designed. It assumed that adhesive layer linear viscoelastic material and its creep mechanical behavior expressed by standard solid model. The shear strain transfer model FBG sensor established. Additionally, instantaneous quasistatic functions are obtained. validated uniaxial tensile test long-term...

Phased arrays can be used for detecting cracking (and other defects) in high tensile bolts. The technique uses a “fingerprinting” approach to the bolts. In contrast to current code procedures where an operator manually scans a normal beam probe over a bolt and interprets the results, this phased array technique uses an S-scan and a mechanized scanner. Specifically, the phased array probe is mou...

In this research, the influence of bolt preload on the fatigue strength of 2024-T3 aluminium alloy double lap bolted joints has been studied experimentally and numerically. To do so, three sets of the specimens were prepared and each of them subjected to tightening torque of 1,2.5 and 5 N-m and then fatigue tests were conducted under various cyclic axial load levels. In the numerical method, th...

The selection of optimum support system is a key step in the successful design operation of tunneling, rock mass stabilization and minimization of plastic zone extension around a tunnel. In this context, it is not sufficient to rely only on the experiences of design engineers, but taking all effective measures and parameters is necessary to do a proper choice. In this paper, multi attribute dec...

the selection of optimum support system is a key step in the successful design operation of tunneling, rock mass stabilization and minimization of plastic zone extension around a tunnel. in this context, it is not sufficient to rely only on the experiences of design engineers, but taking all effective measures and parameters is necessary to do a proper choice. in this paper, multi attribute dec...

In coal mines, bolt loosening in the cage guide is affected by the harsh environmental factors and cage hoist vibration, leading to significant threats to work safety. It is crucial, to this effect, to successfully detect the status of multipoint bolts of guide structures. This paper proposes a system to monitor bolt status in harsh environments established based on the RFID technique. A proof-...

The focus of this paper is the thick soft rock mass roof track roadway in No. 3606 panel Chaili Coal Mine. Due to its substantial thickness, susceptible damage and deformation during mining process. In order preserve integrity roof, a full anchor cable support scheme proposed after studying mechanism bolt-anchor support. supporting parameters feasibility were determined through experience numer...

Abstract The specimens of anchorage structures bonded by different anchoring materials are prepared to study the damage and reduced safety reliability caused cyclic loading unloading stress roadway structure. Using Fiber Bragg grating, acoustic emission monitoring ANSYS, structures’ bearing properties, interface failure characteristics, overall mode internal influence mechanism obtained under p...