The corrosion of geotechnical prestressed anchor rods directly affects the safety structure engineering. To this end, an experimental device for measuring stress loss was developed, which used to study a under corrosive environment, obtain change curve structure, and analyze influence environment on in coastal areas. final results show that degree damage bolts determined by cross effect stress,...

This review summarises information that is relevant to concerns that have recently been expressed about stunning and slaughter. It is known that captive bolt stunning can result in brain material passing to the lungs via the jugular veins. If future studies show that BSE prions pass beyond the lungs to the edible carcass, there will be a move away from captive bolt stunning in large cattle towa...

The corrosion fatigue performance of high-strength bolt was studied. Based on the fracture mechanics theory and the Gerberich-Chen formula, the high-strength bolt corrosion fracture crack model and the fatigue life model were established. The high-strength bolt crack depth and the fatigue life under corrosion environment were quantitatively analyzed. The factors affecting high-strength bolt cor...

Soft broken surrounding rock exhibits obvious rheological properties and time-dependent weakening effects under the action of deep high-ground stress, leading to increasingly prominent problem sustained large deformation in roadways. In this study, with II5 Rail Rise Zhuxianzhuang Coal Mine as an example, mechanism control technology damage instability a soft-rock roadway were explored through ...

In this study, different plate fixing designs were tested in order to improve rock bolting performances. Instead of commonly used steel nuts, investigated by both laboratory and site studies. addition, the usability nuts energy absorbers made polyamide type engineering polymer was assess whether they are advantageous for aim supplying high-energy absorbing features. experimental deformation-con...

This paper presents a novel bolt-loosening detection technique using image information of bolted joints in steel bridges. Firstly, existing bolt-loosening detection techniques are reviewed and their benefits and limitations are analyzed. Secondly, a bolt-loosening detection algorithm using image processing techniques is newly proposed for bolted joints in steel bridges. It consists of 3 steps: ...

Based on the engineering background of providing advance support for working face mining roadways, this paper studies reasonable technology roadway roofs by combining theoretical analysis, numerical simulation, and field tests. geological conditions 1304 Yineng Coal Mine, FLAC3D simulation software was used to compare analyze effects original single hydraulic prop bolt-mesh-cable without prop. ...

In this paper, we report our findings on implementing a synthetic phased array surface acoustic wave sensor to quantify bolt tension. Maintaining proper bolt tension is important in many fields such as for ensuring safe operation of civil infrastructures. Significant advantages of this relatively simple methodology is its capability to assess bolt tension without any contact with the bolt, thus...