Combined with specific engineering examples, the spatial disturbance influence characteristics and laws of surrounding rock stress in staggered roadways are analyzed by numerical simulation. This paper concludes that (1) compared pressure behavior general roadway, stability roadway is relatively poor, showing local serious behavior, such as intensified destruction side, failure fracture penetra...

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...

As rock bursts are unavoidable in deep mines and excavations with high in-situ stresses, ground support systems implemented to manage mitigate bursts. Cable bolts commonly used as reinforcing elements systems, which subject dynamic loads burst-prone excavations. To design an efficient cable bolt conditions, shear energy absorption capacity must be considered. Numerical modelling is advantageous...

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: ...

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...

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 stability of the gas extraction roadway is very important for safe mining coal and gas. compression arch formed by combined action prestressed bolt (cable) support surrounding rock has been widely used in engineering practice roadway. It great application value to analyze influence parameters on arch. In this paper, with deep Huainan Huaibei area Anhui Province, mechanical are measured via ...