Analysis of the Dynamic Response of Underground Structures under Internal Explosion

2011 ◽  
Vol 255-260 ◽  
pp. 1681-1686
Author(s):  
Peng Fei Ning ◽  
De Gao Tang
Keyword(s):  
Finite Element ◽  
Cylindrical Shell ◽  
Dynamic Response ◽  
Analytic Solution ◽  
Underground Structure ◽  
Finite Element Code ◽  
Underground Structures ◽  
Underground Blast ◽  
Internal Explosion ◽  
Different Thickness

Analytic solution for the dynamic response of underground structure is generally based on the theory of cylindrical shell. The underground structure constructed to resist internal blast is not suitable to be treated as cylindrical shell structure and is difficult to get analytic solution. In this paper, finite element code LS-DYNA is employed to calculate the dynamic response of underground blast-resistant structures exposed to internal blast. Two structures with different thickness buried in four types of surrounding rocks are calculated, and the influence of the surrounding rocks to the dynamic response of underground blast-resistant structures is analyzed.

Stability Analysis of Rock and Effect Evaluation of Supporting Scheme in Tianchi Underground Plant

2012 ◽  
Vol 256-259 ◽  
pp. 1329-1339
Author(s):  
Tao Luo ◽  
Huan Feng Qiu ◽  
Shao Jun Fu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Field ◽  
Underground Structure ◽  
In Situ Stress ◽  
Water Diversion ◽  
Underground Structures ◽  
Hydro Power ◽  
The Stability ◽  
Element Method

With the implementation of Western Development, West-to-East Electricity Transmission Project and South-to-North Water Diversion Project, a large number of hydro-power stations have been built in the west middleland regions of China. Because of the complexity of terrain, geological and physical-mechanical conditions, the stability of large underground structures becomes one of the most important problems during the engineering design, construction and operation. This paper will take Tianchi hydro-power station as an example, according to the measured stresses at several points, the in-situ stress field is feedback analyzed by using the combination of the genetic algorithm and 3D finite element method. Then, the rheological model of bolted joint rock and nonlinear finite element method are adopted to calculate the displacement field, stress field and D-P point safety factor of the underground structure. The stability of the underground structure is discussed, the excavating and supporting scheme are also presented, and the supporting effect is evaluated. The achievements in this paper can not only be taken as the reference to the design, but also provide some design experiences for other underground structures.

Dynamic Response of Underground Structure under Vertical Earthquake Action

2011 ◽  
Vol 105-107 ◽  
pp. 1480-1483 ◽  
Author(s):  
Chao Sun ◽  
Qing Wang
Keyword(s):  
Numerical Simulation ◽  
Dynamic Response ◽  
Underground Structure ◽  
Soil Layer ◽  
Vertical Stress ◽  
Compressive Deformation ◽  
Bottom Plate ◽  
Underground Structures ◽  
The Earth ◽  
Earthquake Action

The research of stability of underground structures under earthquake action is one of the hot topics in Geotechnical Engineering researches .Through numerical simulation the article studies the dynamic response rules of the underground structure under vertical earthquake action. The result shows that under vertical earthquake action the vertical stress on the roof and bottom plate of underground structure and the same depth in the earth both increases, and the vertical stress on the roof and bottom plate of underground structure is much higher than that on the same depth in the earth (above two times); under vertical earthquake action the underground structure experiences greater vertical stress from time to time, and produces vertical compressive deformation, and sometimes it completely separates from the above soil layer.

Surface Overpressure Distribution and Dynamic Response of the Retaining Wall of the Underground Structure Subjected to Inner Explosion

2013 ◽  
Vol 790 ◽  
pp. 396-400
Author(s):  
Li Tian ◽  
Peng Deng
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Retaining Wall ◽  
Underground Structure ◽  
Element Model ◽  
Frame Structure ◽  
Multiple Reflections ◽  
Finite Element Software ◽  
Blast Overpressure ◽  
Distribution Rule

An underground structure has been in a state of static equilibrium under the combined effect of gravity and the surrounding soils confining pressure before internal explosion occurred, and the blast wave can experience multiple reflections and diffractions in closed space, so the overpressure on the surface of structural members was more complex than that when explosion happened in the open space. In this paper, a finite element model of a closed underground frame structure was established by using the finite element software ANSYS/LS-DYNA. Based on the model, numerical simulation by stages was done to study the overpressure distribution on the surface of the retaining wall. This paper main analyzed the effect of the initial balance stress on the blast overpressure distribution rule and the retaining walls dynamic response.

The Dynamic Response Analysis on the Surrounding Ground of Underground Structure

2012 ◽  
Vol 204-208 ◽  
pp. 1301-1306
Author(s):  
Guo Dong Zhang ◽  
Jian Long Zhang ◽  
Jian Long Cao ◽  
Wen Luo
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Underground Structure ◽  
Time History ◽  
Limited Range ◽  
Seismic Effect ◽  
Response Analysis ◽  
Analysis Model ◽  
Element Analysis ◽  
History Of

Based on the theory of soil-structure interaction, the underground structure and surrounding soil as a system, and the finite element analysis model is established, and finite element dynamic analysis method is implemented, the three seismic acceleration time history of the different spectrum characteristics is inputted, the seismic effect on the surrounding ground of underground structure is analyzed. The results show that the effect on dynamic response is the limited range and not significant, when seismic design of structures on the surrounding sites is implemented, additional dynamic response on surrounding sites does not need to consider.

Numerical Simulation of Blast Loadings on a Thick-Walled Cylindrical Vessel

2007 ◽  
Author(s):  
Guide Deng ◽  
Ping Xu ◽  
Jinyang Zheng ◽  
Yongjun Chen ◽  
Yongle Hu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Dynamic Response ◽  
Rigid Wall ◽  
Cylindrical Vessel ◽  
Finite Element Code ◽  
Explicit Finite Element ◽  
Shell Deformation ◽  
Blast Loadings ◽  
Good Agreement

Determining blast loadings on an explosion containment vessel (ECV) is the foundation to design the ECV. Explosion of TNT centrally located in a thick-walled cylindrical vessel and its impact on the cylinder was simulated using the explicit finite element code LS-DYNA. Blast loadings on the cylinder computed are in good agreement with the corresponding experimental results. Then wall thickness and yield stress of the cylinder were changed in the following simulation to investigate effect of shell deformation on blast loadings. It is revealed that shell deformation during the primary pulses of blast loadings is so slight that it has little influence on the blast loadings. Though the deformation may increase greatly after the primary pulses, the dynamic response of an ECV is mainly affected by the primary pulses. Therefore, decoupled analyses are appropriate, in which the shell of an ECV is treated as a rigid wall when determining blast loadings on it.

About Contemporary Seismic Analysis of Underground Structures

2018 ◽  
Vol 931 ◽  
pp. 91-99
Author(s):  
Alexander M. Belostotskiy ◽  
Pavel A. Akimov ◽  
Dmitry S. Dmitriev
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Soil Structure ◽  
Seismic Analysis ◽  
Underground Structure ◽  
Soil Structure Interaction ◽  
Underground Structures ◽  
Structure Interaction ◽  
Second Stage ◽  
Element Method

This paper is devoted to actual problems of seismic analysis of underground structures. Brief classification and overview of corresponding methods of analysis (force-based methods, displacement-based methods, numerical methods of seismic analysis of coupled system “soil – underground structure” and approaches to problems of soil-structure interaction) is presented. Special static finite element method with substructure technique for seismic analysis of underground structures is described. Dynamic soil-structure interaction system can be decomposed into three sub-structures: structure, near-field and far-field soil. The first stage of static finite element method is solving the free field shear stress, acceleration, velocity and displacement, when the moment that the relative displacement of the soil that the underground structure located in reaches the maximum. The second stage is computing of internal forces and parameters of boundary conditions. The third stage is construction of the static finite element model and imposing the loads and constrains computed at the second stage and then making a static analysis.

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