Abstract The degradation of earthen sites due to natural and human factors has become a pressing issue, necessitating urgent protection measures. In this context, accurate assessment the vulnerability is essential for development effective conservation strategies. study, comprehensive evaluation framework that incorporates multiple indicators proposed. particular, entropy weight- (Technique Order Preference by Similarity an Ideal Solution) TOPSIS method employed quantitative combined with...

Weakly cemented red sandstone is common in the construction of shaft engineering western China. Based on actual working conditions, dynamic mechanical behavior this kind rock under combined action multiple variables was studied. freezing temperature method for construction, experimental gradient set at 25°C to −25°C. Using an modified split Hopkinson pressure bar (SHPB) system, response frozen weak-cemented lateral constraints Taking and static stress fields as entry point, relationship...

Abstract. Frequent record-high temperatures in recent years have led to a rise both the frequency and intensity of drought events while also altering formation process droughts. The worldwide occurrences flash droughts during past decade are evidence that may evolve an unusually rapid manner. Such change challenges existing monitoring early-warning systems typically designed for monthly scale purposes. This leads query regarding what extent would be accelerated at high temperatures. Based on...

The You Only Look Once (YOLO) series algorithms have been widely adopted in concrete crack detection, with attention mechanisms frequently being incorporated to enhance recognition accuracy and efficiency. However, existing research is confronted by two primary challenges: the suboptimal performance of mechanism modules lack explanation regarding how these influence model’s decision-making process improve accuracy. To address issues, a novel Dynamic Efficient Channel Attention (DECA) module...

The influence of rock weathering caused by freezing–thawing on stone cultural relics cannot be ignored. For immovable relics, different parts under environmental conditions will freeze–thaw actions and suffer degrees damage. In this paper, three typical cycle tests sandstone are designed, namely immersion test, capillary action periodic saturation test. macroscopic microscopic morphologies samples cycles were analyzed. Weathering indicators such as porosity, water content, wave velocity,...

Salt crystallization represents one of the primary forms weathering encountered in rock cultural heritage sites, with sulfate having particularly notable destructive effects. This study focuses on sandstone and limestone, using them as test materials to conduct simulation experiments under specific environmental conditions. The experimental process involved documenting surface morphology samples analyzing changes indicators such wave velocity, hardness, composition, pore size distribution....

With rapid economic development and a continuous increase in motor vehicle numbers, traffic congestion on highways has become increasingly severe, significantly impacting efficiency public safety. This paper proposes investigates prediction emergency lane strategy based object detection algorithms. Firstly, the YOLOv11 algorithm combined with ByteTrack multi-object tracking is employed to extract flow parameters—including volume, speed, density—from videos at four monitoring points Changshen...

A concrete plastic-damage model, the extended Drucker–Prager model for rockfill, and acoustic elements water were introduced applied to impact fracture analysis of a concrete-faced rockfill dam–water three-dimensional system. The dynamic process was used in combination with compressive tensile damage model. 223-m high Shuibuya dam analyzed using an explicit integration. Numerical simulations threshold, modeling, interface processing conducted research effect anti-explosion performance that...

Abstract Three dimensional computational-fluid-dynamics simulations are performed for the fluid flow within a 40 rod fuel bundle in square arrangement with central moderator channel. To ensure spacing between rods, design of uses thin wires wrapped counter-clockwise around each rod. This geometry is presently investigated framework European High-Performance Light-Water Reactor (HPLWR), which operates at supercritical pressure 25 MPa. A section one revolution located evaporator region HPLWR...

An intelligent algorithm that simultaneously analyzes multiple rockfill parameters is proposed. First, the paper introduces operation and monitoring condition of Shuibuya concrete-faced dam (CFRD). Then constitutive models FEM analysis procedure are introduced in this paper. Third, MsPSO was adopted to inverse parameters. The recalculated displacement CFRD using inversed presented, a satisfactory result obtained, indicating inversion method correct effective. developed can be any...

Abstract The accurate performance evaluation of a cutterhead is essential to improving structure design and predicting project cost. Through extensive research, this paper evaluates the tunnel boring machine (TBM) for cutting ability slagging ability. This propose efficiency, stability, continuity as indexes comprehensive performance. On basis research true TBM engineering applications, proposes calculation method each index. A efficiency index with ratio maximum difference between amount...

Abstract Shock waves arriving at a dam site are close to plane when the center of an underwater explosion is far from site. In general, wave pressure calculated with COLE empirical formula. The formula negative exponential function respect time. this paper, new analytical solution algorithm proposed, which does not require use step-by-step time integration. Comparison integration, proposed requires relatively less calculation and avoids high-frequency oscillation. Furthermore, vertical...

As a key component of the full face rock tunnel boring machine (TBM), cutterhead endures multi-point random impact loads in many projects. result, some engineering faults may appear, such as severe vibration, abnormal wears cutting tools, cracking panel and seal failure main bearing. Lacking vibration evaluation systematic was reason. A multi-hierarchy system has been established from regarding situation, which, dynamics equations by finite element method, regarded value three-direction...

Stress shielding effect is the main factor which affects reconstructive surgery of prosthesis. At present, difference constitutive relationship between 3D printed titanium alloy prosthesis implant and human bone leads to stress phenomenon in defect repairing surgery. To solve this problem, paper establishes a porous structure model implantation conforming through analysis on mapping unit tissue elastic modulus model. And with optimized print parameters for printer testify experiment. The...

Abstract In 2016, Typhoon No. 10 landed on Hokkaido, Japan and resulted in slope failures near Nissho Pass. The massive precipitation generated serious runoff within the catchment area, which accounted for instability. Besides, rainfall induced instability developed as landslide. However, traditional analyses were often finished ignoring transportation of instable soil. This study conducted soil runout analysis well with a finite element method-material point method (FEM-MPM) model to catch...

Abstract The ground penetrating shield technology (GPST) is a fast tunnelling method, wherein the launched and received at surface without constructing deep large working shafts. With regard to notable sloping excavation characteristics of GPST, this study established three-dimensional numerical model analyze impact slope on structural response tunnel lining based South Longshui Road Cross-river Tunnel project in Shanghai. results indicate that circumferential earth pressure acting...

Abstract. Frequent record high temperatures in recent years have led to a rise both the frequency and intensity of drought events, while also altered formation process drought. The worldwide occurrences flash droughts during past decade are evidence that may evolve an unusually rapid manner. Such change challenges existing monitoring early warning systems typically designed for monthly-scale purposes. This leads query what extent would be accelerated under temperatures. Based on reanalysis...

Porous implant prostheses can effectively reduce the stress shielding effect. Still, single elastic modulus prosthesis cannot adapt to individual skeletal variability, so it is necessary optimize structural parameters of overcome variability. In this regard, study analyzes law and mechanical properties after selecting type porous structure (diamond structure). It proposes optimization method on basis. First, functional relationship equations between unit mass prosthesis, were established...