Flat Rate Mechanical Optimizational Analysis of Four-Lane Tunnel with Single Arch Based on Load Structure Model

2011 ◽  
Vol 480-481 ◽  
pp. 1577-1580
Author(s):  
Tong Liu ◽  
Zi Chao Dong
Keyword(s):  
Structural Analysis ◽  
Surrounding Rock ◽  
Structural Stress ◽  
Tunnel Structure ◽  
Structure Model ◽  
Flat Rate ◽  
Large Span

In order to analyze the influence of flat rate on mechanical character of large-span tunnel structure, the structural analysis of three flat rates in four-lane tunnel with single arch is progressed by the compiled procedure of load structure model. The result shows that the lower flat rate is, the more unfavorable structural stress is and the more unstable surrounding rock is, the optimal flat rate of four-lane tunnel is 0.65.

scholarly journals ANALISIS GAYA GEMPA PADA BANGUNAN RUMAH TINGGAL DI WILAYAH GEMPA TINGGI

2018 ◽  
Vol 7 (2) ◽  
pp. 57-64
Author(s):  
Alfian Wiranata Zebua
Keyword(s):  
Structural Analysis ◽  
Shear Force ◽  
Structure Model ◽  
Dynamic Shear ◽  
Earthquake Loads ◽  
Story Drift ◽  
Loads Analysis ◽  
Support Reactions ◽  
Static Shear

Abstract : Four stories building was used as structure model. Static earthquake loads distribution were determined according to SNI 1726:2012. The effect of dynamic earthquake loads also considered. The result of structural analysis determined using ETABS. It were static shear force 1.082,64 KN and dynamic shear force, Fx = 1.057 KN and Fy = 983,5 KN. Colomn and beam forces were also determined. Support reactions and joint displacements were determined through structural analysis. Mass modal participation has been reached over 90% at mode 5. Story drift was still smaller than the allowable story drift.Keywords : earthquake loads analysis, residential building.Abstrak:Model struktur yang dianalisis yaitu gedung beraturan lantai 4 untuk rumah tinggal. Distribusi beban gempa statik diperoleh sesuai dengan SNI 1726:2012. Pengaruh beban gempa dinamik juga diperhitungkan. Hasil analisis struktur diperoleh antara lain besaran gaya geser statik 1.082,64 KN dan gaya geser dinamik, Fx = 1.057 KN dan Fy = 983,5 KN. Besaran gaya elemen kolom dan balok juga diperoleh. Reaksi tumpuan serta perpindahan titik buhul dapat diketahui dari hasil analisis yang dilakukan. Pada mode 5, partisipasi massa model yang dianalisis sudah mencapai 90%.Simpangan antar lantai yang terjadi pada model struktur tidak melebihi simpangan yang diijinkan.Kata kunci : analisis gaya gempa, bangunan rumah tinggal.

Research on Deformation Mechanism of Surrounding Rock during Excavation of Large-Span Shallow-Buried Double-Arch Tunnel

2013 ◽  
Vol 392 ◽  
pp. 890-894
Author(s):  
Shao Rui Sun ◽  
Ye Xu Lu ◽  
Shao Hua Zhang ◽  
Ji Min Wu
Keyword(s):  
Deformation Mechanism ◽  
Back Analysis ◽  
Ground Surface ◽  
Surrounding Rock ◽  
Tunnel Excavation ◽  
Large Span ◽  
Main Work ◽  
Time Space ◽  
Space Effect ◽  
Force Mechanism

The deformation mechanism of surrounding rock during excavation is difficult to stability evaluation for large-span shallow-buried double-arch tunnel. Take Fenghuang mountain tunnel in Suzhou city as an example, the main work and funding are as follow: The measured data in the middle of the tunnel, including settlement on the top of the tunnel and deformation between two lateral walls, were used to calculate mechanical parameters by back analysis method. The obtained parameters were used to calculate the deformation and stress of the main tunnel excavation in the different steps. The rules includes time-space effect during main tunnel excavation, force mechanism of the middle wall and settlement on the ground surface for the surrounding rock in the main tunnel. Finally, the calculated settlement and deformation were compared to the monitoring results. The safety coefficient of surrounding rock for double-arch tunnel was obtained by strength reduction theory.

scholarly journals Stability Analysis and Control Measures of Large-Span Open-Off Cut with Argillaceous Cemented Sandstone Layered Roof

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Wenxiang Zheng ◽  
Yujie Guo ◽  
Guojun Zhi ◽  
Xiankai Bao ◽  
Ming Sun ◽  
...  
Keyword(s):  
Control Measures ◽  
Structure Model ◽  
Theory Analysis ◽  
Beam Structure ◽  
Large Span ◽  
Roof Caving ◽  
Working Face ◽  
Field Practice ◽  
Weak Interlayer ◽  
And Control

This paper is based on the condition where layered argillaceous cemented sandstone as an engineering background is met by the No. 207 fully mechanized working face open-off cut (Wanli No. 1 Coal Mine). Through mechanical theory analysis and field practice, the engineering safety problem of the large-span argillaceous cemented sandstone layered open-off cut roof supporting structure was analyzed. The roof caving arch height of the open-off cut roadway in 207 working face was obtained based on the mechanical mechanism of instability and caving of the layered surrounding rock mass roof. The anchor cable suspension and bearing stability of the open-off cut roof were analyzed in terms of the layered beam structure model. Meanwhile, combining with conditions, reasonable and effective support countermeasures and key parameters are proposed for such open-off cut roadway and enhance the actual supporting engineering on-site. These research results could provide engineering reference for an open-off cut roadway with composite roof conditions featured to weak cementation and weak interlayer.

scholarly journals Numerical Simulation of Ultra-Shallow Buried Large-Span Double-Arch Tunnel Excavated under an Expressway

2021 ◽  
Vol 12 (1) ◽  
pp. 39
Author(s):  
Jianxiu Wang ◽  
Ansheng Cao ◽  
Zhao Wu ◽  
Zhipeng Sun ◽  
Xiao Lin ◽  
...  
Keyword(s):  
Fracture Zone ◽  
Horizontal Displacement ◽  
Surrounding Rock ◽  
Spatial Effects ◽  
Partition Wall ◽  
Tunnel Support ◽  
Large Span ◽  
Construction Design ◽  
Excavation Process ◽  
Fault Fracture Zone

The temporal and spatial effects of a complicated excavation process are vital for an ultra-shallow buried large-span double-arch tunnel excavated under an expressway in service. Numerical simulations are urgent and necessary to understand the effect of the total construction process. Taking Xiamen Haicang tunnel as a research object, the total excavation process of three pilot tunnels and the three-bench reserved core soil method of an ultra-shallow buried large-span double-arch tunnel with a fault fracture zone under an expressway was simulated using software FLAC3D. The deformation of the surface, surrounding rock, underground pipelines, tunnel support structure and partition wall of the three pilot tunnels and the main tunnel was analyzed, and the dangerous areas and time nodes were obtained. When the tunnel was excavated to the fault fracture zone, the deformation of the surface and surrounding rock increased significantly. The rock and soil within 20 m behind the excavation surface of the pilot tunnel were greatly disturbed by the excavation. During the excavation of the main tunnel, the horizontal displacement of the middle partition wall moved slightly towards the main tunnel excavated first. The research results can provide a reference for the construction design of double-arch tunnels.

Structural Analysis and Study on Support Technology of Refuge Chamber of Mine

2012 ◽  
Vol 204-208 ◽  
pp. 1356-1361
Author(s):  
Fang Wei Li ◽  
Long Zhe Jin ◽  
Hai Rong Han ◽  
Xiao Chen Zhang
Keyword(s):  
Numerical Analysis ◽  
Structural Analysis ◽  
Life Support ◽  
Surrounding Rock ◽  
Reinforcement Material ◽  
Floor Heave ◽  
Stability Structure ◽  
Supporting Effect ◽  
Arch Structure ◽  
Set Up

As the down-hole refuge chamber is the last life support for miners, its stability structure is especially important in its design. This paper tested the loose circle of the surrounding rock of refuge chamber with double-hole method, proposed the related parameters of chamber support, and conducted numerical analysis for the deformation, damage and supporting effect of the surrounding rock by using FLAC. The result shows: the loose circle radius of this refuge chamber is about 1.7~2.0m；the surrounding rock of refuge room belongs to IV class with large loose circle, designs support parameters with anchor net spray built-up arch theory; the numerical analysis shows that the floor suffers from floor heave, so it needs to be set up with anti-arch structure and be filled with reinforcement material.

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