Finite element inversion computation for surrounding rock mass parameters of large-span shallow-buried highway tunnel

2013 ◽  
pp. 161-168
Keyword(s):  
Finite Element ◽  
Rock Mass ◽  
Surrounding Rock ◽  
Large Span ◽  
Highway Tunnel

Mechanics Analysis of Grade V Surrounding Rock Primary Support in Maanziliang Tunnel

2012 ◽  
Vol 164 ◽  
pp. 414-417
Author(s):  
Jia Ming Han
Keyword(s):  
Finite Element ◽  
Safety Factor ◽  
Surrounding Rock ◽  
Qinling Mountains ◽  
The Finite Element Method ◽  
Highway Tunnel ◽  
Geological Conditions ◽  
The Stability ◽  
Primary Support ◽  
Rock Section

Commonly used finite element strength reduction to calculate the safety factor of slope，to analyze the stability of the slope[1～3]. Recently it also proposed the methods to evaluate the safety factor for the stability of surrounding rock of underground chambers and supporting structural mechanics[4～6]. For Qinling Mountains of the complex geological conditions in the Maanziliang highway tunnel, this article use the finite element method from the bolt resist tension, bolt length, the force of sprayed layer of concrete to computing gradeⅤsurrounding rock section of primary support safety factor, to give evaluation to support mechanics of the Maanziliang tunnel.

The Research on Application of Strength Reduction Finite Element Method in Stability Analysis of Weak Intercalated Rock Tunnel

2011 ◽  
Vol 255-260 ◽  
pp. 1926-1929
Author(s):  
Da Kun Shi ◽  
Yang Song Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rock Mass ◽  
Safety Factor ◽  
Slip Surface ◽  
Strength Reduction ◽  
Surrounding Rock ◽  
Stability Of Surrounding Rock ◽  
The Stability ◽  
Element Method

Based on geologic condition of one tunnel surrounding rock mass, systematic numerical tests had been carried out to study the stability of surrounding rock mass with different distributions of weak intercalated rock by the FEM software ABAQUS and strength reduction finite element method. Some quantificational results about the stability of surrounding rock mass were summarized. And the safety factor and latent slip surface were worked out. The stability of surrounding rock mass was judged by strength reduction finite element method. According to the analysis above, it’s known that the discrepancy of two rules is small; the safety factor is the lowest when weak intercalated rock in vault, and when at bottom, it’s higher than that of in vault. The conclusion can be used to guide the procedure of construction and ensure the safety.

Stability Analysis of Highway Tunnel through Mined-Out Area during Excavation Process

2013 ◽  
Vol 838-841 ◽  
pp. 1352-1358 ◽  
Author(s):  
Zhi Hao Yang ◽  
Ge Cui ◽  
Ya Peng Fu ◽  
Yong Fang ◽  
Bin Yang
Keyword(s):  
Rock Mass ◽  
Plastic Zone ◽  
Axial Force ◽  
Construction Safety ◽  
Surrounding Rock ◽  
Two Dimensional ◽  
Highway Tunnel ◽  
Excavation Process ◽  
Caving Zone ◽  
Pass Through

Tianpingzhai Tunnel on Dazhou-Wanzhou Expressway passes through the mined-out area, the spatial position of the goaf changes constantly comparing to the tunnel during excavation, and broken rock mass of the caving zone is most likely to collapse, which affects construction safety in return. Two dimensional computation models were built by using finite differential software FLAC to simulate excavation process when the coal-mined area is right above or below the tunnel. In 2D models, goaf strata were regarded as horizontal, and buried depth and coal thickness were limited to 300 meters and 0.5 meter respectively. The displacement around the tunnel, forces of primary lining, axial force of bolts and plastic zone of surrounding rock have been analyzed under these circumstances that the distances between tunnel and goaf are 1m, 6m and 12m. According to the results, when the distance between goaf and tunnel is less than 12 meters,underlying goaf has greater impact on the displacement around the tunnel and average axial force of bolts than overlying goaf, as well as the size of plastic zone of surrounding rock. Its strongly suggested to avoid underlying goaf if the tunnel have to pass through the mined-out area.

Mechanical responses of surrounding rock mass and tunnel linings in large-span triple-arch tunnel

2021 ◽  
Vol 113 ◽  
pp. 103971
Author(s):  
Jiwei Luo ◽  
Dingli Zhang ◽  
Qian Fang ◽  
Daoping Liu ◽  
Tong Xu
Keyword(s):  
Rock Mass ◽  
Surrounding Rock ◽  
Large Span ◽  
Mechanical Responses

Surrounding Rock Rupture Modeling of Tunnel Based on ANSYS

2014 ◽  
Vol 490-491 ◽  
pp. 863-866
Author(s):  
Bai Cheng Ren
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Rock Mass ◽  
Surrounding Rock ◽  
Analysis Software ◽  
Element Analysis ◽  
Tunnel Excavation ◽  
Real Condition ◽  
Supporting System ◽  
The Real

This article is based on the real condition of a tunnel. By using displacement and stress contours get from finite element analysis software ANSYS, the simulation of the tunnel excavation is modeled and the regulation of overlying rock’s displacement and stress is deducted during the evacuation of the tunnel. The analysis result to overlying rock mass’ rupture regularity can be helpful for the control of surrounding rock’s stability and the improvement of supporting system. The result shows finite element analysis software ANASYS can be used to guide tunnel constructions during the evacuation.

Stress Analysis about Flat Ratio and Surrounding Rock of Large Section Highway Tunnel

2013 ◽  
Vol 368-370 ◽  
pp. 1404-1409 ◽  
Author(s):  
Yan Peng Zhu ◽  
Xiao Rui Song
Keyword(s):  
Finite Element ◽  
Stress Analysis ◽  
Axial Force ◽  
Layer Structure ◽  
Bending Moment ◽  
Surrounding Rock ◽  
Structure Model ◽  
Large Section ◽  
Finite Element Software ◽  
Highway Tunnel

By utilizing finite element software MIDAS-GTS, layer structure model is established and the force situation of large section tunnel under the combination of three sets of surrounding rock and three sets of flat ratio is analyzed. Through comparing axial force of anchor, axial force and bending moment of shotcrete and displacement of the lining, the optimal flat ratio is selected. Results can provide reference for the design of the large section highway tunnel.

Stability Study of a Pumped Storage Power Station's Underground Powerhouse

2013 ◽  
Vol 353-356 ◽  
pp. 1635-1638
Author(s):  
Hui Huang ◽  
Guang Ming Ren
Keyword(s):  
Finite Element ◽  
Rock Mass ◽  
Calculation Model ◽  
Stability Study ◽  
Surrounding Rock ◽  
Underground Powerhouse ◽  
Rock Mass Strength ◽  
Primary Stress ◽  
Finite Element Software ◽  
Pumped Storage

In this paper, we use ANSYS finite element software to establish calculation model of the underground powerhouse and FLAC3D to calculate the model in different excavation stages. The purpose of calculation is to predict the surrounding rock displacement after excavation for the reference and evaluation of surrounding rock anchoring and rock mass strength on the basis of the computed result of primary stress and displacement.

Numerical Analysis of Deformation Influence of Horizontal Adit Construction on Main Tunnel Intersection Structure

2012 ◽  
Vol 204-208 ◽  
pp. 1514-1517
Author(s):  
Zhi Jie Sun
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Stress Concentration ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
3D Finite Element ◽  
Arching Effect ◽  
Highway Tunnel ◽  
Element Simulation ◽  
Surrounding Rock Deformation

The 3D finite element simulation are adopted to study the surrounding rock deformation regularity of main tunnel during the horizontal adit construction stage．The Zhongtiaoshan highway tunnel is taken as an example. The research results are shown as follows：Horizontal adit excavation destroys the original arching effect of the main tunnel, which leads to stress concentration at the intersection of primary supporting structure. The first excavation step plays an important play in the surrounding rock deformation of the intersection. The influence range of the main tunnel which due to the horizontal adit excavation is 1.2D.

Influence exerted by underground excavation shape and by effective stresses on the formation of a tensile strain zone at a depth greater than 1 km

2020 ◽  
pp. 67-75
Author(s):  
Van Min Nguyen ◽  
V. A. Eremenko ◽  
M. A. Sukhorukova ◽  
S. S. Shermatova
Keyword(s):  
Rock Mass ◽  
Cross Sections ◽  
Tensile Strain ◽  
Rock Fracture ◽  
Strain Analysis ◽  
Surrounding Rock ◽  
Underground Excavation ◽  
Secondary Stress ◽  
Principal Stresses ◽  
Mining Depth

The article presents the studies into the secondary stress field formed in surrounding rock mass around underground excavations of different cross-sections and the variants of principal stresses at a mining depth greater than 1 km. The stress-strain analysis of surrounding rock mass around development headings was performed in Map3D environment. The obtained results of the quantitative analysis are currently used in adjustment of the model over the whole period of heading and support of operating mine openings. The estimates of the assumed parameters of excavations, as well as the calculations of micro-strains in surrounding rock mass by three scenarios are given. During heading in the test area in granite, dense fracturing and formation of tensile strain zone proceeds from the boundary of e ≥ 350me and is used to determine rough distances from the roof ( H roof) and sidewalls ( H side) of an underground excavation to the 3 boundary e = 350me (probable rock fracture zone). The modeling has determined the structure of secondary stress and strain fields in the conditions of heading operations at great depths.

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