Numerical Simulation upon Explosion and Collapse of Viaduct

2014 ◽  
Vol 638-640 ◽  
pp. 1085-1091
Author(s):  
Shan Ji ◽  
Guang Hui Zhang ◽  
Wei Ping Xie
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Measurement Data ◽  
Soil Surface ◽  
Simulation Method ◽  
Numerical Results ◽  
Explosion Process ◽  
Vibration Responses

A rigorous scheme must be formulated in advance before a viaduct is to be exploded, in this case, numerical simulation can provide effective guarantee to the formulation of the scheme. Focusing on the explosion engineering of a large-scale city viaduct, the process of its explosion and collapse were simulated by the LS-DYNA software. The vibration responses of soil surface caused by the explosion and collapse were analyzed, and also the numerical results were compared with the measurement data. The numerical results agreed well with the measurement data, which showed that the simulation method proposed in the paper could simulate the explosion process well and the results could be also an guidline for the similar projections in future.

The Bench Method Numerical Simulation of Soft Rock Tunnel

2013 ◽  
Vol 438-439 ◽  
pp. 949-953
Author(s):  
Hao Bo Fan ◽  
Jin Xing Lai ◽  
Dan Dan Hou
Keyword(s):  
Numerical Simulation ◽  
Measurement Data ◽  
Soft Rock ◽  
Simulation Method ◽  
Internal Force ◽  
Surrounding Rock ◽  
Supporting Structure ◽  
Highway Tunnel ◽  
Tunnel Design ◽  
Rock Tunnel

This paper based on Chaoyang tunnel by bench method excavation, using the finite element numerical simulation method, simulates the surrounding rock displacement of soft rock tunnel and the stress characteristics of supporting structure to get the various stages of tunnel surrounding rock stress, strain and the internal force changes of tunnel supporting structure. After the analyses of the numerical simulation results and field monitoring measurement data, the safety and rationality of the method are determined. The research provides certain reference for highway tunnel design and construction.

scholarly journals Study on Fluorine Pollution in a Slag Yard

2019 ◽  
Vol 9 (5) ◽  
pp. 847
Author(s):  
Lide Wei ◽  
Changfu Wei ◽  
Sugang Sui
Keyword(s):  
Numerical Simulation ◽  
Experimental Investigation ◽  
Numerical Simulations ◽  
Solute Transport ◽  
Large Scale ◽  
Three Dimensional ◽  
Simulation Method ◽  
Laboratory Studies ◽  
Survey Results ◽  
Simulation Results

This paper suggests a large-scale three-dimensional numerical simulation method to investigate the fluorine pollution near a slag yard. The large-scale three-dimensional numerical simulation method included an experimental investigation, laboratory studies of solute transport during absorption of water by soil, and large-scale three-dimensional numerical simulations of solute transport. The experimental results showed that the concentrations of fluorine from smelting slag and construction waste soil were well over the discharge limit of 0.1 kg/m3 recommended by Chinese guidelines. The key parameters of the materials used for large-scale three-dimensional numerical simulations were determined based on an experimental investigation, laboratory studies, and soil saturation of survey results and back analyses. A large-scale three-dimensional numerical simulation of solute transport was performed, and its results were compared to the experiment results. The simulation results showed that the clay near the slag had a high saturation of approximately 0.9, consistent with the survey results. Comparison of the results showed that the results of the numerical simulation of solute transport and the test results were nearly identical, and that the numerical simulation results could be used as the basis for groundwater environmental evaluation.

scholarly journals Numerical Simulation of Soil Displacement and Settlement in Deep Foundation Pit Excavations Near Water

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Zhongjing Hu ◽  
Qingbiao Wang ◽  
Shuo Yang ◽  
Zhenyue Shi ◽  
Bo Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Yellow River ◽  
Soft Soil ◽  
Ground Surface ◽  
Horizontal Displacement ◽  
Simulation Method ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit

Advancing urbanization in China requires large-scale high-rise construction and underground transportation projects. Consequently, there is an increasing number of deep foundation pits adjacent to water bodies, and accidents occur frequently. This study uses a numerical simulation method to study the stability of the deep foundation pit near water based on the Biot three-dimensional seepage-stress coupling model, with the open-cut section on the south bank of the Jinan Yellow River Tunnel Project as the engineering field test. This indicates the following: (1) the maximum horizontal displacement of the diaphragm wall occurred in the fifth excavation stage, and a horizontal brace effectively controlled the inward horizontal displacement of the foundation pit; (2) considering the effect of seepage in the soft soil foundation, the maximum vertical displacement of the ground surface at each excavation stage occurred adjacent to the underground continuous wall. As the depth of the foundation pit increased, the vertical surface settlement decreases gradually in the direction away from the excavation face; (3) considering the seepage conditions, within each interval of excavation of the foundation pit, the horizontal displacement of the continuous underground wall and ground settlement declined; and (4) the numerical simulation and field monitoring data were in good agreement. Under the conditions of accurate model simplification and parameter selection, numerical simulations can adequately forecast conditions of the actual project.

scholarly journals Research on Sand-dust Separation Technology Based on Gas-solid Two-phase Numerical Simulation

2020 ◽  
Vol 145 ◽  
pp. 02068
Author(s):  
Lei Zhang ◽  
Junwei Wang ◽  
Guohua Li
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Separation Efficiency ◽  
Simulation Method ◽  
Test System ◽  
Two Phase ◽  
Separation Technology ◽  
Electromechanical Products ◽  
Environment Simulation ◽  
Sand Dust

The separation technology in the large-scale sand-dust environment ground simulation test system applicable to the environmental adaptability and reliability verification of aerospace electromechanical products is studied. The gas-solid two-phase numerical simulation method is adopted, and the possible cyclone separation, inertial separation methods are used to study the separation efficiency and regularity technology, which provides a basis for the separation design and test of the sand-dust environment simulation of large electromechanical products.

Analysis of Stretching Load in Tension Stretching Process of Aluminum Alloy Thick-Plate by Using Finite Element Method

2014 ◽  
Vol 904 ◽  
pp. 236-240
Author(s):  
Da Wei Zhang ◽  
Sheng Dun Zhao ◽  
Fei Jing ◽  
Qi Zhang ◽  
Shu Qin Fan
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Aluminum Alloy ◽  
Large Scale ◽  
Thick Plate ◽  
Simulation Method ◽  
Friction Condition ◽  
Initial Thickness ◽  
Aluminum Alloy 6063 ◽  
Stretching Process

Tension stretching process is an important link in production of aluminum alloy thick-plate. Exploring the change of load in tension stretching process is important for the structure designing and key component checking of large-scale tension stretcher. In this paper, the changing law of stretching force in the tension stretching process of aluminum alloy 6063 thick-plate has been investigated by numerical simulation method, and the influence of initial thickness of plate and friction condition in clamping area was analyzed. The results indicated that the initial thickness has a notable influence but friction condition has a little influence on stretching load; and the stretching force increases at first and then decreases slightly, and then it is tending toward stability; and the larger the values of thickness and friction, the more stable the stretching force in the process.

Discussion about Train-Induced Ground Vibration

2012 ◽  
Vol 170-173 ◽  
pp. 1546-1549
Author(s):  
Chang Liang
Keyword(s):  
Numerical Simulation ◽  
Incident Wave ◽  
Ground Vibration ◽  
Simulation Method ◽  
Numerical Results ◽  
Building Structure ◽  
Reflected Wave ◽  
Numerical Simulation Method ◽  
Structure Vibration ◽  
Train Induced Vibration

The building vibration induced by train loads has aroused people’s great attention. Many investigations have been carried out by many researches in order to evaluate the effect of train-induced vibration on environment. But they have not shown the reason why enlarged vibration region exist in front of a building. In this paper, building structure vibration induced by train loads was analyzed by numerical simulation method performed by ANSYS. Based on numerical results, it’s concluded that the reason for this phenomenon that enlarged vibration region may exist in front of a building is the result that incident wave and the reflected wave superpose mutually. Subsequently, the influence of barrier depth on the enlarged vibration region is also discussed.

Research on Linux-Based PC Cluster System and its Application in Numerical Simulation for Shallow Buried Soft Soil Tunnel

2015 ◽  
Vol 730 ◽  
pp. 3-10
Author(s):  
Jun Du ◽  
Zhi Rong Mei ◽  
Li Lei Fu ◽  
Kui Zhang
Keyword(s):  
Numerical Simulation ◽  
Working Conditions ◽  
High Performance ◽  
Large Scale ◽  
Low Cost ◽  
Soft Soil ◽  
Three Dimensional ◽  
Simulation Method ◽  
Cluster System ◽  
Pc Cluster

Since numerical simulation method came out, it has caused a great importance to tunnel engineers and has been used widely. But it has been restricted in three-dimensional numerical analysis of multi-element and multi-working conditions because the out of memory of personal computer, the high cost of high-performance computer and so on. In view of this, we need to search the low-cost computing devices to solve the large-scale three-dimensional numerical simulation in tunnel engineering. After investigation and study, we have built a Linux-based PC cluster system successfully, and use it to simulate the excavation process of Xiamen Jiaheyuan underground access which is a rectangular shallow buried soft soil tunnel. The simulation results provide a basis for the construction. Linux-based PC cluster system provides a convenient and cheap solution for tunnel engineers in three-dimensional numerical simulation of multi-element and multi-working conditions.

scholarly journals Protection of the Liuzheng Water Source: a Karst Water System in Dawu, Zibo, China

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 698 ◽  
Author(s):  
Henghua Zhu ◽  
Yanan Dong ◽  
Liting Xing ◽  
Xiaoxun Lan ◽  
Lizhi Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Groundwater Resources ◽  
Water System ◽  
Water Source ◽  
Simulation Method ◽  
Karst Water ◽  
Domestic Water ◽  
Numerical Simulation Method ◽  
Protection Area

The Dawu water source is a rare, large-scale groundwater source located in northern China. The water supply function from this water source has, however, been lost due to anthropogenic pollution. In order to fully utilize valuable groundwater resources, a new water source of urban domestic water in Liu Zheng is planned. In this study, a tracer test and a numerical simulation method are used to examine the hydraulic connection between the Liuzheng water source and the Wangzhai industrial park; to optimize the exploitation layout of the Liuzheng water source and Dawu water source; and to propose the extent of the Liuzheng water source protection area. Results indicate that: (1) Karst development in the study area is uneven, and the Wangzhai area is a recharge area of the Liuzheng water source; (2) it is predicted that the groundwater flow field will not be significantly changed when a groundwater volume of 150,000 m3/day is exploited from the Liuzheng water source; (3) it is predicted that the proposed chemical park in Wangzhai will gradually pollute to the groundwater in the northern area of Liuzheng; and (4) results using the empirical formula method and the numerical simulation method indicate that the area of the primary protection area of the Liuzheng water source is about 0.59 km2, and the area of the secondary protection area is about 14.98 km2. Results from this study provide a certain technical basis for the exploitation and protection of groundwater in the Liuzheng water source.

Prediction of Groundwater Inundation Based on GMS - With Example of Inundation-Affected Areas in Upstream of Dadingzishan Reservoir

2012 ◽  
Vol 550-553 ◽  
pp. 2580-2587
Author(s):  
Si Miao Sun ◽  
Chang Lei Dai ◽  
Chun Li Liu ◽  
Li Qing Liang
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Water Balance ◽  
Human Activities ◽  
Large Scale ◽  
Simulation Method ◽  
Analysis Method ◽  
Land Utilization ◽  
Water Balance Method ◽  
Controlling Elements

To deal with specific groundwater inundation problems such as large-scale study area, complicated recharge and discharge terms and special aquifer structures, there may be some inappropriateness or limitation in accuracy, range or flexibility when using traditional methods, including the experience analysis method, water balance method and the principle of Hydrodynamics. However, the numerical modeling method, which can break the constraints of space, time and accuracy, can conquer the problems above, even though there have been very few utilizations of the numerical simulation method on inundation prediction. With the real case of the inundation-affected areas located in the upstream of the Dadingzishan Reservoir, firstly, it analyzed and listed out the major controlling elements, including fundamental controlling elements (location and range, topography, land utilization, hydrology and meteorology, reservoir operation, and human activities, etc.) and key controlling elements (structures, boundaries, functions, input features of the aquifer) in this paper. Secondly, a hydrogeological conceptual model and numerical simulation model had been established to serve for the prediction of inundation range and degree. After the identification and verification of the model and calculating the future recharge and discharge, the fully qualified model had made a forecasting of the inundation situations in 2015 and 2020. This paper is expected to provide practical example and method application for the relative reservoir inundation research.

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