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Seismic Performance and Damage Restoring Force Model of Brick Walls Corroded by Chloride Salt
Pore Characteristics and Mechanical Properties of Recycled Aggregate Concrete Modified with Power Plant Corn Stalk Ash
Research Progress on the Application of Machine Learning in Turbidity Prediction of Urban River Water
Reinforcement Design and Nonlinear Finite Element Analysis of Spillway Surface Hole Pier of Tankeng Hydropower Station
Flood Monitoring and Impact Assessment of the 2024 Dike Breach in the Tuanzhouyuan Polder Using SAR Imagery
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Visualized Experimental Study on Cross-media Penetration Characteristics of Dynamic Anchor
LIU Mingxiao;MENG Ben;DAI Hongfei;MENG Yaxu;LIU Junguo;【Objective】 To meet the requirements of rapid and efficient emergency response to dike breaches, this study investigates the penetration motion characteristics of a cabled dynamic anchor across different media. 【Methods】 A transparent Slime gel was adopted as the test medium, and a visualized penetration experimental apparatus was designed and developed. Using a generalized dynamic anchor as the research object, penetration experiments of the cabled dynamic anchor were conducted under different initial conditions. Through multiple sets of experiments, measured data, including penetration trajectory, velocity, interface oscillation, and anchoring force, were obtained. 【Results】 The penetration trajectory of the anchor approximately followed a cubic function pattern, and the anchor exhibited a significant deflection toward the inner side of the interface normal before coming to rest. After entering the gel, the anchor velocity decayed rapidly, and the initial launch conditions had a significant influence on the penetration characteristics of the anchor. The penetration depth exhibited an approximately logarithmic response relationship with the launch force, while a strong positive correlation was observed between the penetration depth and the anchoring force, which followed an exponential functional trend. 【Conclusion】 The functional relationships for anchor velocity decay and trajectory change are approximately similar. Furthermore, the anchor deflection is greatly influenced by the launch angle. In addition to affecting the penetration depth, the initial launch conditions of the anchor also directly influence its anchoring force. These findings contribute to the advancement of theoretical research on cross-media penetration and to the design and development of dynamic anchors for emergency rescue applications.
Numerical Simulation of Penetration Characteristics of Rocket Anchors in Soil for Emergency Rescue
SUN Dongpo;QIAO Chi;DONG Mingjia;LIU Mingxiao;MENG Ben;【Objective】 Sealing breaches in river levees is difficult to accomplish quickly. Utilizing rocket anchor penetration technology to rapidly establish anchoring points at a breach can effectively improve the anti-scour stability of cast materials. To provide an effective solution for rapid levee breach closure, this study investigates the penetration process and mechanical characteristics of rocket anchors in different media. 【Methods】 A single rocket anchor was selected as the research object, with soil chosen as the penetration medium. A three-dimensional numerical simulation was conducted to establish a mathematical model of rocket anchor penetration. Simulations were conducted under various initial conditions. The three-dimensional simulation of penetration into soil was used to investigate, at a microscopic level, the stress state of the anchor, the plastic strain of the soil, and the morphological characteristics of the cavity formed by the anchor penetration. 【Results】 The simulation results showed that the localized pressure field caused by soil resistance was mainly concentrated at the anchor head, with the pressure gradient exhibiting unstable variation. During penetration, changes in the Von Mises equivalent stress of the soil at the anchor boundary responded synchronously with changes in the pressure field, and their fluctuation patterns were basically consistent. The initial velocity of the anchor affected its penetration depth in the soil. As the initial velocity increased, the penetration depth increased, but the stability of the anchor decreased. When the initial velocity exceeded a critical value, the anchor deviated, resulting in reduced penetration depth. 【Conclusion】 The findings contribute to the design of rocket anchors for emergency rescue and provide a theoretical basis and technical support for the application of scientific and efficient breach closure technologies.
Numerical Simulation Research of Array Effects on Flow Fields of Dike Breach Based on Pile Groups
HUANG Yujie;ZHANG Xiaolei;WU Xinyu;SUN Dongpo;LIU Junguo;【Objective】 The study reveals the influence mechanisms of three pile group arrangements-no piles, plum blossom-shaped, and rectangular-on the array effects of breach flow fields and their hydrodynamic characteristics, aiming to provide a theoretical basis for optimizing pile group layouts in dike breach emergency response. 【Methods】 A three-dimensional dike breach model was established using FLOW-3D software to simulate the evolution of breach flow patterns under the three pile group arrangements. The influence of pile groups on breach hydrodynamics was systematically evaluated. 【Results】(1) Pile group arrangements significantly reduced flow velocities in the breach and floodplain areas while optimizing flow field distribution.(2) Compared to the no-pile condition, pile group arrangements decreased the maximum breach flow velocity from 2.305 m/s to 2.094-2.185 m/s, resulting in reductions of approximately 5.21%-9.15%. The mainstream velocity in the floodplain area decreased from 2.880 m/s to 2.182-2.840 m/s, resulting in reductions of approximately 1.39%-24.24%.(3) The water depth distribution pattern in the breach zone under the three layouts was as follows: in the no-pile and plum blossom-shaped layouts, water depth at the breach gradually decreased along the flow direction; in the rectangular arrangement, water depth at the breach was higher at the front and rear sides and lower in the center, forming a triangular high-water-depth zone in the downstream floodplain.(4) The rectangular arrangement demonstrated the most effective flow attenuation, followed by the plum blossom-shaped arrangement, whose velocity variation pattern resembled that of the no-pile arrangement. The flow pattern at the breach under the plum blossom-shaped arrangement was smoother than that under the no-pile arrangement. The rectangular arrangement proved superior in mitigating hydraulic forces and improving breach flow patterns. Its triangular high-water-depth zone effectively reduced flow impact, enhancing protection of downstream floodplain areas. 【Conclusion】 The hydrodynamic regulation advantages of different pile group layouts vary, with the rectangular arrangement demonstrating the most comprehensive effectiveness in flow velocity reduction and flow pattern improvement. This study provides a scientific basis for optimizing pile group design in rapid breach closure projects, holding significant practical insights for enhancing emergency response efficiency and flood disaster management capabilities.
Numerical Simulation of Novel Technique for Stabilizing Breach Embankment Head Based on Anchor Array Rooting
LIU Yufei;PANG Rui;XU Bin;CUI Feng;ZHOU Yang;【Objective】 To ensure the stability of river embankment breaches, this study explores a novel, scientific, efficient, and adaptable technique for breach head wrapping. 【Methods】 Based on the principle of anchor array rooting and the water-resisting technique of connecting steel mesh gabions with anchor cables, a novel technique using dynamic anchors was proposed to stabilize breach embankment head. The technique combined rocket anchors with steel mesh gabions to rapidly construct a stable structure at the breach head. Concurrently, numerical simulations of the integrated anchor cable-steel mesh gabion system were conducted using FLOW-3D software to analyze the influencing factors of anchor cable force and investigatethe relationships between anchor cable force and suspended gabion mass, the inclination angle between anchor cable and riverbed, and breach flow velocity. 【Results】 The anchor cable force increased with the suspended gabion mass, increased as the inclination angle between the anchor cable and the riverbed decreased, and increased with the breach flow velocity. Under the maximum tensile load on the anchor cables, the risk of anchor cable fracture was essentially eliminated. 【Conclusion】 Numerical analysis verifies the force pattern of the anchor cables and the application reliability of this technique, and can provide data support and a theoretical basis for the development of related equipment.
Research on Selection and Demand Calculation Method of Closure Materials Based on Multi-stage Characteristics of Breach Emergency Response
HUANG Wei;HAN Yue;DING Shiyu;LIU Junguo;【Objective】 To address the problems of unscientific selection of closure materials for dike breaches, inaccurate calculation of material quantities, and the lack of staged dynamic adaptation analysis in existing research, a systematic method for selecting closure materials and calculating their demand is established. It aims to improve emergency response efficiency, minimize disaster losses, and provide scientific support for flood control and emergency decision-making. 【Methods】 Based on fluid-solid coupling mechanisms, the interaction between the hydraulic characteristics of breaches and dumped materials was investigated. The physical properties and application conditions of five typical types of closure materials were systematically analyzed. According to the staged characteristics of breach closure, geometric modeling and engineering generalization methods were adopted to establish a staged material demand calculation model. Empirical verification was conducted using the breach across the Tuanzhouyuan in the Dongting Lake as a case study. 【Results】(1) The constructed material demand calculation model exhibited good engineering applicability in terms of both the suitability of closure material selection and quantity calculation accuracy.(2) It clarified the differences in material requirements across different closure stages, established a quantitative estimation method for material quantities at each stage, and significantly improved resource allocation efficiency. Case verification indicated that this method could provide scientific and reliable decision support for on-site emergency response. 【Conclusion】 The proposed staged material selection and demand calculation method is innovative and practical. It achieves the precise matching among hydraulic conditions, stage characteristics, and material parameters, provides a scientific basis for emergency response, and promotes technological progress in flood control and emergency rescue. It offers important theoretical value and practical significance for improving China′s disaster prevention and mitigation capabilities.
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