Given the flammability of power cables and high cost utility tunnel construction, cable fires cause serious economic losses are associated with a negative social impact. In study, weighted fuzzy Petri net an event tree combined to propose quantitative evaluation method mitigate fire risks in tunnel. First, risk factors analyzed. lack historical data, theory is used calculate failure probability primary event. Second, for reasoning, analyze all possible consequences. Subsequently, numerical...

Bus Rapid Transit (BRT) has become an increasing source of concern for public transportation modern cities. Traditional contact sensing techniques during the process health monitoring BRT viaducts cannot overcome deficiency that normal free-flow traffic would be blocked. Advances in computer vision technology provide a new line thought solving this problem. In study, high-speed target-free vision-based sensor is proposed to measure vibration structures without interrupting traffic. An...

This paper studies the limitations of binocular vision technology in monitoring accuracy. The factors affecting surface displacement slope are analyzed mainly from system structure parameters and environment parameters. Based on error analysis theory, functional relationship between is studied. distribution curve obtained through laboratory testing sensitivity analysis, parameter selection criteria proposed. Corresponding image optimization methods designed according to parameters, a large...

Tunnel projects in mountainous areas are considered a kind of high-risk work due to the complexity geological conditions, as well diversity construction and management factors. Numerous research efforts have been made estimate risk level tunnel collapse by multicriteria decision-making (MCDM) methods considering variety factors, aiming provide decision basis for management. However, uncertainty fuzziness randomness existing evaluation factors gradation usually neglected. The information...

Abstract Calculating deformation values and determining areas are essential for slope monitoring safety management. Recently, terrestrial laser scanning has been widely used due to its speed efficiency. However, handling a large amount of point cloud data obtain the deformed area is still challenging. To rapidly evaluate information, this study proposes simplification algorithm based on multi-parameter feature preservation. The proposed method retains points (i.e. inflection edge points)...

The paper presents an intelligent real-time slope surface deformation monitoring system based on binocular stereo-vision. To adapt the to field monitoring, a design scheme of concentric marking point is proposed. Techniques including Zernike moment edge extraction, least squares method, and k-means clustering are used sub-pixel precision localization method for marker images. This study mostly focused tracking accuracy objects in multi-frame images obtained from camera. For this purpose,...

Working at heights causes heavy casualties among workers during construction activities. Workers’ unsafe action detection could play a vital role in strengthening the supervision of to avoid them falling from heights. Existing methods for managing workers’ actions commonly rely on managers’ observation, which consumes lot human resources and impossibly covers whole site. In this research, we propose an automatic identification method detecting actions, considering working environment, based...

Abstract Background Shared decision making (SDM) improves the health status of patients with chronic diseases, especially in condition poly-medicated patients. This study aims to find factors associated participation diseases SDM on medication. Methods A total 1,196 were selected Hubei Province China using cluster sampling methods. The random forest method was applied rank importance independent variables by Mean Decrease Gini and out-of- bag (OOB) curve. Multivariate logistic regression...

With the large‐scale construction of urban rail transit, it will lead to intersection and transfer various lines, resulting in more stations. The station is a collection point for multiple subway which difficult construct has high risk. new operation existing are mutually influenced during close‐attached undercrossing construction. Considering two objectives ensuring smooth safe station, this paper comprehensively analyzes possible safety risk factors operating identifies 75 preliminary by...

This paper proposes a systemic framework for dynamic safety risk analysis natural gas pipeline leakage in utility tunnel, which merges the bow-tie model (BT), Bayesian network (BN), and fuzzy set theory (FST) combined with monitoring data. Firstly, hazard factors that cause tunnel are identified to establish BT simulating causal relationship under specific accident scenes. Subsequently, is mapped BN via logic probabilistic reasoning, prior probability of basic event obtained through...

Intelligent safety management based on machine vision has become indispensable in reducing collision accidents during construction. To prevent collisions between workers and machines excavation site construction, a real-time intelligent evaluation system to reflect worker–machine status was developed. The included: (1) determination of the key factors affecting interactive operation machines; (2) extraction precursor semantic information related assessment for each object construction...

Abstract Rock–shotcrete structures are often suffered from dynamic shearing. However, the understanding of shear response rock–shotcrete is still at its infancy. To investigate effects strain rate and interface roughness on structure, laboratory tests were carried out modified double notched sandstone–concrete specimen. Testing results show that strength peak specimens both far less than those sandstone concrete specimens. With increasing rate, specimen increases failure mode changes...

Abstract In dry-wet cycles, the clay minerals of expansive soil repeatedly hydrate and dehydrate, causing its expansion contraction, resulting in many cracks, which will bring harm to human engineering construction. Microwave, as an efficient material improvement method, has been used mineral synthesis manufacturing. Our previous studies have proved that microwave technology can improve performance soil, but long-term stability by not studied. this paper, is effect on damage law under cycles...

After the May 12 earthquake in Wenchuan, numerous debris flow disasters occurred due to heavy rainfall. earthquake, disaster prevention and mitigation projects, such as sand dam, played an essential role safety. However, when outflow of solid material exceeds designed storage capacity overtopping dam intensifies scraping effect on source gully channel. This paper takes "8.20" Chutou research object. A transport mode after is studied through comprehensive field investigation, theoretical...