Anisotropic properties of shale and its impact on underground structures: an experimental and numerical simulation

2021 ◽  
Author(s):  
Chaojun Jia ◽  
Qiang Zhang ◽  
Mingfeng Lei ◽  
Yanni Zheng ◽  
Juan Huang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Underground Structures ◽  
Anisotropic Properties

Analysis of Seismic Factors to Tunnels in the Earthquake

2012 ◽  
Vol 166-169 ◽  
pp. 2182-2189
Author(s):  
Yan Zou ◽  
Li Ping Jing ◽  
Hai Feng Sun ◽  
Yong Qiang Li
Keyword(s):  
Numerical Simulation ◽  
Failure Mechanism ◽  
Relative Displacement ◽  
Shield Tunnel ◽  
Seismic Responses ◽  
Underground Structures ◽  
Circular Tunnel ◽  
P Waves ◽  
S Waves ◽  
As Stress

Underground structures have mechanical characteristics and seismic responses very different from common structures on the ground in the earthquake due to the constraints of the surrounding soil. Tunnel destruction has occurred many times in domestic and international earthquake. In order to study seismic factors and failure mechanism of tunnels in the earthquake, numerical simulation of the seismic responses of the circular shield tunnel is carried on. Harmonic P-waves and S-waves are entered to make the tunnel vibrate and deform. Viscous-spring artificial boundary condition is applied in the numerical simulation to consider the semi-infinity of soil. The elastic modulus of soil, the frequency of harmonic waves and the depth of the tunnel are regarded as the main factors. The seismic responses such as stress and relative displacement are analyzed in different parameters to get the failure mechanism of circular tunnel.

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.

scholarly journals Numerical modeling of anisotropic properties of a solid by particle dynamics method

2021 ◽  
Vol 2140 (1) ◽  
pp. 012018
Author(s):  
D Ya Sukhanov ◽  
A E Kuzovova
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Crystal Lattice ◽  
Longitudinal Wave ◽  
Wave Velocity ◽  
Solid Body ◽  
Particle Dynamics ◽  
Longitudinal Wave Velocity ◽  
Anisotropic Properties ◽  
Dynamics Method

Abstract A method is proposed for the numerical simulation of acoustic processes in solids based on the particle dynamics approach for describing the anisotropic properties of a solid. It is proposed to consider a solid body in the form of an array of particles located in a cubic body-centered crystal lattice. To set the anisotropic properties of a solid, it is proposed to use its own proportionality force to shift coefficient for each direction. Based on the results of numerical simulation, the dependence of the longitudinal wave velocity on the direction is shown.

Numerical simulation on slope stability analysis considering anisotropic properties of layered fractured rocks: a case study

2014 ◽  
Vol 8 (8) ◽  
pp. 5413-5421 ◽  
Author(s):  
Tian-hong Yang ◽  
Wen-hao Shi ◽  
Pei-tao Wang ◽  
Hong-lei Liu ◽  
Qing-lei Yu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Stability Analysis ◽  
Slope Stability ◽  
Fractured Rocks ◽  
Slope Stability Analysis ◽  
Anisotropic Properties

Effect of Blasting on the Adjacent Underground Tunnels

2011 ◽  
Vol 90-93 ◽  
pp. 1870-1878 ◽  
Author(s):  
Zu Song Wu ◽  
Guang Qi Chen ◽  
Kouki Zen ◽  
Kiyonobu Kasama ◽  
Dao Liang Wang
Keyword(s):  
Numerical Simulation ◽  
Underground Structure ◽  
Surrounding Rock ◽  
Tunnel Structure ◽  
Underground Structures ◽  
Economical Method ◽  
Explosive Energy ◽  
Finite Element Software ◽  
Severe Effect ◽  
Blasting Method

The blasting method is regarded as a simple, convenient and economical method for constructing the underground structure, so it is advisable method for many underground structures to construct. But the investigation of the effect of the blasting dynamic load on the vicinal tunnel structure is rare, and the effect of blasting on the vicinal structures cannot be ignored either; sometimes, the effect will cause crack and even collapse in the tunnel liner and surrounding rock. So this paper presented the effect of blasting on the vicinal underground structure in differential cases using the finite element software Midas GTS. The investigation in this paper indicated which case will suffer the more severe effect caused by blast and let us know the vibration principle of the underground structure in differential case, and that will provide the knowledge about the vibration caused by blasting to the design and construction by numerical simulation; additionally, this paper has presented the reinforcement method about inserting the bolt into the surrounding rock to analyze how to resist the effect of the blast load. So from this analysis, it can be noted that the blasting method or the explosive energy will be chosen on the basis of different construction shape, and the reasonable location of the bolt will be adopted in order to reduce the effect of the dynamic on the vicinal tunnel structure.

Prediction for Long-Term Deformation of Existing Tunnels Induced by Underground Excavation in Shanghai Subway Project

2013 ◽  
Vol 353-356 ◽  
pp. 1390-1393
Author(s):  
Zhi Guo Zhang ◽  
Meng Xi Zhang ◽  
Xiao Xiao
Keyword(s):  
Numerical Simulation ◽  
Deformation Behavior ◽  
Simulation Method ◽  
Soil Consolidation ◽  
Underground Excavation ◽  
Railway Transportation ◽  
Underground Structures ◽  
Service Line ◽  
Site Investigations

The long-term deformation behavior for existing underground structures induced by tunneling is a hot problem which engineers designing and practicing in urban subway engineering encounter more frequently than in the past. Based on the Shanghai Railway Transportation project, the long-term deformation of existing tunnels caused by underground excavation is proposed considering soil consolidation by 3D consolidation finite element numerical simulation method. The maximum consolidation deformation values for service Line 4 are obtained within the time span of thirty years after the tunneling excavation is completed. Furthermore, comparisons between numerical simulation results and the field data are conducted according to site investigations. It is concluded that the calculated consolidation displacements are in general consistent with the observed shapes and the soil consolidation has a significant influence on the deformation behavior of existing tunnels during the service process.

Influence of Overlying Soil on Dynamic Response of Underground Structure

2012 ◽  
Vol 170-173 ◽  
pp. 1765-1768
Author(s):  
Chao Sun ◽  
Qing Wang
Keyword(s):  
Numerical Simulation ◽  
Dynamic Response ◽  
Simulation Analysis ◽  
Underground Structure ◽  
Horizontal Displacement ◽  
Linear Increase ◽  
Underground Structures ◽  
Soil Thickness ◽  
Side Walls ◽  
Surrounding Soil

The article studies the influence of overlying soil thickness on dynamic response of underground stuctures by adopting the method of numerical simulation analysis. It carries on numerical analyses of dynamic response to the underground structures which overlying soil thickness is 0m、1.4m、2.8m、7.0m、14m、21m、28m. The results show that with the increase of overlying soil thickness, the horizontal displacement difference of bottom and top of side walls increases gradually. When the overlying soil thickness exceeds the height of underground structures, the displacement difference basically presents the rule of linear increase, while the displacement difference of the surrounding soil in the same depth do not change with the overlying soil thickness.

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