scholarly journals Stress Characteristics and Overload Failure Analysis of Cemented Sand and Gravel Dam in Naheng Reservoir

Open Physics ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 950-959
Author(s):  
Zhaoqiang Wang ◽  
Xin Chen
Keyword(s):  
Numerical Simulation ◽  
Failure Mode ◽  
Model Test ◽  
Structural Model ◽  
Test Method ◽  
Distribution Law ◽  
Dead Weight ◽  
Cemented Sand ◽  
Stress And Deformation ◽  
Sand And Gravel

Abstract On the basis of the Naheng Reservoir Project, the stress, strain, and deformation of Naheng Reservoir cemented sand and gravel dam are simulated numerical simulation and structural model test. The stress and deformation laws of the dam under the combined load of dead weight and normal water level are analyzed using the structural model test method. Compared with the finite element numerical simulation, the results reflect the stress and deformation distribution law of the dam. Then, the failure mode of the cemented sand and gravel dam can be visualized by using the water load overload method to conduct the structural model failure test, and the failure mode and failure mechanism of the cemented sand and gravel dam can be discussed. The research results lay a foundation for further determining the safety degree analysis of cemented sand and gravel dam.

scholarly journals Statistical Law and Predictive Analysis of Compressive Strength of Cemented Sand and Gravel

2020 ◽  
Vol 27 (1) ◽  
pp. 291-298
Author(s):  
Shoukai Chen ◽  
Yongqiwen Fu ◽  
Lei Guo ◽  
Shifeng Yang ◽  
Yajing Bie
Keyword(s):  
Compressive Strength ◽  
Back Propagation ◽  
Back Propagation Neural Network ◽  
Predictive Analysis ◽  
Distribution Law ◽  
Data Set ◽  
Cemented Sand ◽  
Mix Proportion ◽  
Kolmogorov Smirnov ◽  
Sand And Gravel

AbstractA data set of cemented sand and gravel (CSG) mix proportion and 28-day compressive strength was established, with outliers determined and removed based on the Boxplot. Then, the distribution law of compressive strength of CSG was analyzed using the skewness kurtosis and single-sample Kolmogorov-Smirnov tests. And with the help of Python software, a model based on Back Propagation neural network was built to predict the compressive strength of CSG according to its mix proportion. The results showed that the compressive strength follows the normal distribution law, the expected value and variance were 5.471 MPa and 3.962 MPa respectively, and the average relative error was 7.16%, indicating the predictability of compressive strength of CSG and its correlation with the mix proportion.

Study on Similar Skills of Dynamic Model Test Concerning Fluid-Structure Interaction for Water-Conveyance Tunnel in Soft Soil

2010 ◽  
Vol 29-32 ◽  
pp. 1458-1463 ◽  
Author(s):  
Jin Yun Liu ◽  
Jian Yun Chen
Keyword(s):  
Numerical Simulation ◽  
Model Test ◽  
Structural Model ◽  
Soft Soil ◽  
Fluid Structure Interaction ◽  
Similar Relationship ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Water Conveyance ◽  
Water Conveyance Tunnel

Three basic types of similar relationship between the prototype and the model for dynamic structural model test and dynamic destructive model test were proposed in corresponding literatures. At the time the situation where various similar relationships are applicable and the technique to ensure similarity for the different goal was discussed. Here the numerical simulation of model test of water-conveyance tunnel concerning fluid-structure interaction in soft soil is studied. Based on economy and practicability of selective material for model test, the similar relationship and the technique are proposed, which are validated through the example. The results of numerical simulation show: under the specific conditions, data of the model test can completely transfer to those of the prototype by use of this type of similar skill, and get more useful information. Some new ideas are introduced to keep the similarity of the hydro-structure structures.

scholarly journals Numerical simulation of pounding damage to caisson under storm surge

2018 ◽  
Vol 38 ◽  
pp. 03046
Author(s):  
Chen Yu
Keyword(s):  
Numerical Simulation ◽  
Storm Surge ◽  
Failure Mode ◽  
Structural Model ◽  
Time History ◽  
Element Model ◽  
Wave Force ◽  
New Method ◽  
Wave Direction ◽  
Force Time

In this paper, a new method for the numerical simulation of structural model is proposed，which is employed to analyze the pounding response of caissons subjected to storm surge loads．According to the new method，the simulation process is divided into two steps. Firstly, the wave propagation caused by storm surge is simulated by the wave-generating tool of Flow-3D, and recording the wave force time history on the caisson. Secondly，a refined 3D finite element model of caisson is established，and the wave force load is applied on the caisson according to the measured data in the first step for further analysis of structural pounding response using the explicit solver of LSDYNA. The whole simulation of pounding response of a caisson caused by “Sha Lijia” typhoon is carried out. The results show that the different wave direction results in the different angle caisson collisions, which will lead to different failure mode of caisson, and when the angle of 60 between wave direction and front/back wall is simulated, the numerical pounding failure mode is consistent with the situation.

Numerical Simulation and Analysis of Tapered Interference Fit of Atomizer Disk

2012 ◽  
Vol 201-202 ◽  
pp. 170-174
Author(s):  
Shun Hong Lin ◽  
Chang Jiang Li ◽  
Jian Ping Ding ◽  
Dai Chuan Chen
Keyword(s):  
Numerical Simulation ◽  
Stress Concentration ◽  
Stress Distribution ◽  
High Speed ◽  
Engineering Application ◽  
Axial Direction ◽  
Analysis Model ◽  
Distribution Law ◽  
Interference Fit ◽  
Stress And Deformation

The contact analysis model of high speed centrifugal atomizer is created and stress distribution law is obtained by using ANSYS FEM software in this paper. The stress distribution along the axial direction is uneven, the stress of the small end of the taper is large and the stress concentration appears on both ends of the taper. In addition, the factors which influence the interference fit stress are researched and discussed. The interference fit stress is mainly influenced by the shrink range, while the influence from the friction coefficient is very weak. Comparing with the conventional design, the position and value of the stress and deformation of the parts can be known exactly and thoroughly by using the approach proposed in this paper. The method provides a very valuable reference to designing the best shrink range for engineering application.

scholarly journals Similar Materials and Engineering Application of Cemented Sand and Gravel Dam Model

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Qihui Chai ◽  
Zongkun Li ◽  
Juan Wang ◽  
Zelin Ding ◽  
Meiju Jiao
Keyword(s):  
Model Test ◽  
Engineering Application ◽  
Coarse Sand ◽  
The Body ◽  
Normal Operation ◽  
Cemented Sand ◽  
Similarity Principle ◽  
Similar Materials ◽  
New Type ◽  
Sand And Gravel

This paper takes the cemented sand and gravel dam (CSGD) in Shoukoubao reservoir as the prototype to introduce in detail the similarity principle of model test and describe the selection steps of materials for CSG model. It has developed similar materials for CSGD model by mixing coarse sand, barite powder, gypsum powder, cement, and iron powder so as to provide reference for CSGD model test in the future. The dam model test has studied the stress distribution and displacement deformation of the dam during construction and normal operation, in order to provide experimental support for the study of failure mechanism of the CSGD and facilitate the design and construction of dams of this kind. The stress level of the body and the foundation of the model dam varied from 1/9 to 1/17 of the designed compressive strength of dam material. The results showed that CSGD is a safe new type of dams.

Research on Computing Method of Similarity Scale of Dynamic Model Test Concerning Fluid-Structure Coupling for Water-Conveyance Tunnel

2011 ◽  
Vol 80-81 ◽  
pp. 626-630
Author(s):  
Jin Yun Liu ◽  
Cai Chu Xia
Keyword(s):  
Numerical Simulation ◽  
Model Test ◽  
Structural Model ◽  
Soft Soil ◽  
Similarity Relation ◽  
Elastic Response ◽  
Dynamic Rupture ◽  
Water Conveyance ◽  
Similarity Scale ◽  
Water Conveyance Tunnel

Based on the research of numerical simulation of model experiment of water-conveyance tunnel in under soft soil, and three basic types of similarity relation ship between the prototype and the model for dynamic structural model test and dynamic rupture model test was proposed, and the situation where various similarity relation ship is applicable and the technique to ensure similarity for the different goal (to study dynamic behavior, elastic response or damage pattern) was discussed, the similarity relation and the technique is proposed according to specific selection of material of model test . At one time the similarity relation and the technique is validated to pass a example. The results of numerical simulation show: in the specific thing, the similarity relation completely from data of the model test transfer to the prototype. Some new ideas to keep the similarity of the embankment structures are introduced.

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