Rock bolting has firmly used as the coal mine roof reinforcement in underground coal mine. The bolting effect of fully grouted rebar bolt is closely related to the bolt surface profile. This paper provides an experimental study to confirm that bolt rib internal length has great influence on bolting effect. Pull-out tests were conducted using rebar bolt with different rib spacings of 12, 24, 36 ...

The bond behavior and failure mechanisms of lap splices with multiple deformed rebars were evaluated using a Three-Dimensional Rigid Body Spring Model (3D RBSM) beam element. Previous studies have shown the applicability method in simulating single rebar. In this study, we validated numerical simulation stress-slip unconfined confined various parameters. Then, splices, investigated simulated de...

The load transfer mechanisms of cable bolts differ from those for normal rebar bolts. The cable bolts used in mines are basically steel strands with different constructions depending on the number of wires or elements and the way they are laid. Tendon bolts (rebar and cable) are normally evaluated for their strength and load transfer properties. The tendon strength can be evaluated by the tensi...

Rebar engineering in the construction industry lacks effective technical means and has a high processing cost waste rate. Under background of intelligent construction, centralized mode steel bars prefabricated factories realizes automatic improves efficiency bars. Using C# programming language, combined with Revit secondary development technology, generation rebar model export drawing are reali...

In this work, duplex stainless steel/low-alloy steel-clad rebars were fabricated using metal deposition and hot rolling. The interfacial characteristics of the rebar, such as element diffusion phase composition, investigated an optical microscope a scanning electron with energy-dispersive spectrometer. mechanical properties rebar evaluated by tensile bending tests. results show that interface i...

Thoracic traumas have an important place among all injuries as they can cause significant mortality and morbidity. The thoracic injuries are the large part of trauma with head and extremity injuries. Thoracic traumas are divided into two groups, including penetrating and blunt. The primary causes for penetrating traumas are wounds caused by gunshot and sharp objects. The lungs are the most inju...