The precise estimation and forecast of the safety factor (SF) in civil engineering applications is considered as an important issue to reduce risk. present research investigates new artificial intelligence (AI) techniques for prediction SF values retaining walls, resistant structures ground forces. These have complicated performances dynamic conditions. Consequently, more than 8000 designs these were dynamically evaluated. Two AI models, namely imperialist competitive algorithm...

Pillar stability is an important condition for safe work in room-and-pillar mines. The instability of pillars will lead to large-scale collapse hazards, and the accurate estimation induced stresses at different positions pillar helpful design guaranteeing stability. There are many modeling methods evaluate their stability, including empirical numerical method. However, difficult be applied places other than original environmental characteristics, often simplify boundary conditions material...

A large number of rock works in cold areas suffer from long-term freeze-thaw damage, and it seriously affects the stability mine slopes. In this paper, XRD component measurement, P-wave velocity, cycling test at different times, uniaxial compression test, scanning electron microscope (SEM) were carried out to obtain mechanical properties microstructure evolution skarn under effect cycles. The results study indicate that with an increase cycles, mass gradually increases compressive strength,...

AMA Wei X, Zhao Y, Chen H, Krustrup P, Randers M, C. Are EFI data valuable? Evidence from the 2022 FIFA World Cup group stage. Biology of Sport. 2024;41(1):77-85. doi:10.5114/biolsport.2024.127382. APA Wei, X., Zhao, Y., Chen, H., Krustrup, P., Randers, M., & (2024). Sport, 41(1), 77-85. https://doi.org/10.5114/biolsport.2024.127382 Chicago Xiaobin, Yifan Hui Peter Morten B and Chong Chen. 2024. "Are stage". Sport 41 (1): Harvard pp.77-85. MLA Xiaobin et al. stage." vol. 41, no. 1, 2024, pp....

Purpose The purpose of this study is to develop a stochastic finite element method (FEM) solve the calculation precision deficiency caused by spatial variability dam compaction quality. Design/methodology/approach Choleski decomposition was applied generate constraint random field porosity. Large-scale laboratory triaxial tests were conducted determine quantitative relationship between quality and Duncan–Chang constitutive model parameters. Based on developed relationship, fields mechanical...

The Xiayi Sn deposit, located in the Sanming city, southeast China, is largest deposit Fujian province. mineralization mainly consists of cassiterite-bearing veinlets and stockworks, it spatially associated with granodiorite porphyry. Despite its economic significance, few studies have been carried out, age remains unknown. In this paper, we present first geochronological data on cassiterite porphyry, Hf isotope zircon, trace element compositions from deposit. These give precise constrain...

A 3D numerical model was presented to investigate the blast-induced damage characteristics of highly stressed rock mass. The RHT (Riedel, Hiermaier, and Thoma) in LS-DYNA used simulate its parameters were calibrated by a physical test. Based on model, influences confining pressure free surface span investigated. results show that under uniaxial loading, crater volume increases with increases. static load can change optimal burden critical embedding depth charge. In rock, variation law shape...

A nonlinear regression model for peak-failure strength prediction of rockfill materials is proposed. It based on the relationship between stress ratio and normalized confining pressure as well exponent function intermediate principal ratio. This can predict variations with initial different under general paths. Comparisons measured predicted results show that constant-p′ constant-b path larger than constant-σ3′ path. The predictive capacity proposed better friction angle.

The accurate determination of blast‐induced ground vibration has an important significance in protecting human activities and the surrounding environment. For evaluating peak particle velocity resulting from quarry blast, a robust artificial intelligence system combined with salp swarm algorithm (SSA) Gaussian process (GP) was proposed, SSA used to find optimal hyperparameters GP here. In this regard, 88 datasets 9 variables including ratio bench height burden (H/B) spacing (S/B) were...

To follow the effect of microwave heating path on structure coal, eight 50 mm diameter, 30 long dry coal cores from same seam with similar pore characteristics were microwave-treated using 4 pathways. The T2 spectrum, pore-volume, temperature, mass, and visual changes samples analyzed before after heating. affected macropores microcracks crack development mode. When energy was applied, mainly manifested by opening closed pores, pyrolysis temperature reached. Increasing density caused water...

A hydrodynamic model is developed for rainfall-runoff on asphalt pavement using two-dimensional shallow water equations. simple yet precise expression presented to compute flow velocity in order alleviate the problems associated with numerical instabilities due small depths of thin sheet flow. The performed well against measured data and results two segments. Then, was applied study influence highway horizontal alignment, drainage manner, rainfall pattern, surface roughness geometric...

Coal is an important basic energy source, widely distributed throughout the world, but resource abundance uneven. Despite need to develop and form new sources, coal maintains its dominant position. However, due uneven distribution non-renewable nature of resources, relationship between supply demand resources tight. The rational exploitation reducing mining wastes are particularly at present stage. original method Zhangjiamao mine resulted in a large waste resources. After replacing “110...

It is known that cavitating flow characteristics and instabilities in inducers can greatly impact the safety stability of a liquid rocket. In this paper, step casing optimization design (Model OE Model AE) was carried out for two three-bladed with an equal O) varying pitch A), respectively. The unsteady cavitation field accompanied were studied via numerical simulations. Reductions cavity size fluctuation observed cases casing. A significant difference structures seen as well. Referring to...

Drawing on DFT calculations, the interaction between cathinone drug (CA) and bare B24N24 nanocage was examined in order to find a nanosensor of CA. The results suggested physisorption (−1.23 −4.53 kcal/mol) chemisorption (−12.88 −25.11 kcal/mol). electrical conductivity considerably increased. Thus, it could be used generate electronic noise presence drug. Drug adsorption influenced Fermi levels work functions most stable complex systems some extent. As result, is argued Φ–type sensor that...

融合应力集中因子与贝叶斯理论的 结构健康评估方法