scholarly journals Impact Pseudostatic Load Equivalent Model and the Maximum Internal Force Solution for Underground Structure of Tunnel Lining

2016 ◽  
Vol 2016 ◽  
pp. 1-16
Author(s):  
Xuan Guo ◽  
Xiao Xin Zhang
Keyword(s):  
Model Test ◽  
Internal Force ◽  
Measured Data ◽  
Tunnel Lining ◽  
Theoretical Solution ◽  
Equivalent Model ◽  
Theoretical Formula ◽  
Circular Tunnel ◽  
Lining Structure ◽  
Force Calculation

The theoretical formula of the maximum internal forces for circular tunnel lining structure under impact loads of the underground is deduced in this paper. The internal force calculation formula under different equivalent forms of impact pseudostatic loads is obtained. Furthermore, by comparing the theoretical solution with the measured data of the top blasting model test of circular formula under different equivalent forms of impact pseudostatic loads are obtained. Furthermore, by comparing the theoretical solution with the measured data of the top blasting model test of circular tunnel, it is found that the proposed theoretical results accord with the experimental values well. The corresponding equivalent impact pseudostatic triangular load is the most realistic pattern of all test equivalent forms. The equivalent impact pseudostatic load model and maximum solution of the internal force for tunnel lining structure are partially verified.

The Mechanics Analysis and Feedback Design for Shallow Multi-arch Tunnel under Unsymmetrical Pressure

2011 ◽  
Vol 261-263 ◽  
pp. 1114-1118 ◽  
Author(s):  
Hong Ke Pan ◽  
Yu Guo Zhang ◽  
Jiang Chun Hu ◽  
Lin De Yang
Keyword(s):  
Partial Pressure ◽  
Mechanical Behavior ◽  
Design Method ◽  
Back Analysis ◽  
Internal Force ◽  
Forward Analysis ◽  
Feedback Design ◽  
Mechanics Analysis ◽  
Lining Structure ◽  
Force Calculation

Shallow multi-arch tunnel under unsymmetrical pressure has complex mechanical behavior to which further study is lacking at present. The existing design methods are thoughtless about the features of shallow and partial pressure. The phenomena of cracks, collapse or other diseases in tunnel lining structure are often seen during the construction or after the completion. Combining one tunnel example, this paper presented scientific feedback design method that suited for Shallow multi-arch tunnel under unsymmetrical pressure: made load back analysis with collected information during construction, then averaged the above load and field monitoring load to make forward analysis and internal force calculation, which was used as reference of reinforcement and sectional design for lining structure.

Comparative Study on Calculation Model of Hydraulic Tunnel Lining Structure between Beam Element and Solid Element

2013 ◽  
Vol 405-408 ◽  
pp. 1340-1345
Author(s):  
Jing Jing Zhang ◽  
Jun Deng ◽  
Kai Zhang ◽  
Cheng Huang
Keyword(s):  
Internal Force ◽  
Beam Element ◽  
Calculation Model ◽  
Tunnel Lining ◽  
Practical Calculation ◽  
Solid Element ◽  
Beam Analysis ◽  
Lining Structure ◽  
Calculation Results ◽  
The Right

According to the standard Specification for Design of Hydraulic Tunnels (DL/T 5195-2004), the free-flow tunnel lining structure should be calculated with beam element of finite element method that based on structural mechanics. However, the practical calculation shows that when the lining structure reaches a certain thickness, the beam element calculation results are no longer accurate. Combining with the engineering example, stress and internal force of lining structure with different thickness were calculated by using beam3 beam element and the solid65 element respectively in frame beam analysis. Differences analysis shows that the solid element is better than beam element in calculation. The influence of solid elements grid size on the result accuracy was conducted, and used to amend the calculation result of the solid element, which provides a certain reference on choosing the right element in the similar projects or structure simulation.

scholarly journals Seismic Response of Tunnel Lining for Shallow-Bias Tunnel with a Small Clear Distance under Wenchuan Earthquake

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Yang Hui ◽  
Jiang Xueliang ◽  
Lian Pengyuan
Keyword(s):  
Numerical Model ◽  
Seismic Wave ◽  
Model Test ◽  
Vertical Direction ◽  
Internal Force ◽  
Tunnel Lining ◽  
Seismic Action ◽  
Loading Direction ◽  
Seismic Force ◽  
Clear Distance

In order to study the internal force characteristics of shallow-bias tunnel with a small clear distance in earthquake, a large-scale shaking table slope model test was designed, and the geometric scale was 1 : 10. In the model test, the Wenchuan (WC) seismic wave was used as the excitation wave. Then, the three-dimensional numerical model was established by using MIDAS-NX, and the reliability of the numerical model was verified by comparing the acceleration of the test results. The axial force, bending moment, and shear force of the tunnel cross section and longitudinal direction were calculated by the numerical model under different excitation directions included the horizontal direction (X), the vertical direction (Z), and the horizontal and vertical direction (XZ). The results show the following. (1) The internal force of right arch foot of left hole and the left arch foot of right hole is larger than other part of the tunnels because the distance between the two tunnels is smaller and they interact with each other. (2) The loading direction of single direction loading method is different and the variation trend of tunnel force are different, so the loading direction of seismic wave has a significant influence on the seismic force response of the tunnel. (3) All of the internal force values of tunnel lining under the seismic wave action in bidirection are larger than those in single direction. The value is not a simple superposition of two directions and has some coupling effect. The influence of the vertical seismic wave cannot be ignored in dynamic response research. These results improve the understanding of the rock slope with small spacing tunnel under seismic action.

Cold Trapezoidal Channel Composite Lining Structure Force Analysis and Failure Criteria

2013 ◽  
Vol 655-657 ◽  
pp. 1853-1856
Author(s):  
Xiang Dong Shen ◽  
Yu Pei Zhang
Keyword(s):  
Cold Water ◽  
Precast Concrete ◽  
Failure Criteria ◽  
Water Channels ◽  
Internal Force ◽  
Force Analysis ◽  
Composite Channel ◽  
Lining Structure ◽  
Composite Lining ◽  
Force Calculation

Water conservancy project in the northern cold regions, most of the channel lining structure using polystyrene board plus the compound in the form of precast concrete panels, due to the lack of convenient and practical theoretical model for the guidance of the composite channel lining alone experience and experimental data the size of its structure, the actual cold water channels and the climate and environment in which concrete composite lining water channels necessary assumptions, the use of the theory of the mechanics of composite materials, concrete structures and other composite channel lining structure force analysis, the slope drainage board, backplane, thermal insulation board and other internal force calculation formula, combined with the relevant norms, established channels of composite lining structure failure criteria, and provides a theoretical basis for engineering design and construction of the composite lining channels.

Structural Analysis and Internal Force Calculation of Variable Cross-Section Silo

2012 ◽  
Vol 446-449 ◽  
pp. 429-434
Author(s):  
Rui Ting Ma
Keyword(s):  
Cross Section ◽  
Variable Cross Section ◽  
Internal Force ◽  
Variable Cross ◽  
Axially Symmetric ◽  
Internal Forces ◽  
Differential Element ◽  
Symmetric Load ◽  
Force Calculation ◽  
Constant Section

In this paper, the differential element of constant-section silo wall suffering from axially symmetric load is analyzed. From the results of constant-section silo, the author derives the displacements and internal forces of variable cross-section silo. Through a specific example, this paper compares the displacements , internal forces and concrete consumption of variable cross-section silo with those of constant-section silo, and discusses the merits of variable cross-section silo.

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