Preliminary Study on Application of Metal Members with Corrugated Webs in the Supports of Soft Rock

A new type of metal support named H-Shaped members with corrugated webs is put forward for the soft rock tunnels or roadways supports. The H-shaped member with corrugated webs is welded by corrugated webs and plain flange steel plates. The loading behaviors of the members are greatly improved by the corrugation in the webs compared with that of the members with plain webs. The new type of support has fair good mechanical performances with its own merits, including easy fabrication, fast construction etc. especially it can adapt to the large deformation of soft rocks. The elastic buckling behaviors are analyzed for the new horse-shoe shape supports with corrugated webs. The influences of the sectional parameters on the elastic buckling loads are discussed herein. Results show that the wave amplitude and wave height of corrugated webs have less influence on the buckling loads than those of the height of the webs and the width of the flanges etc. Some problems worth studying in the future for the new type of tunnel supports are also raised. Keywords: corrugated web; support structure; soft rock; tunnel; buckling

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Analysis of Deformation Mechanism and Control Technology of Soft Rock Tunnel with High Geostress

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.638-640.794 ◽

2014 ◽

Vol 638-640 ◽

pp. 794-797

Author(s):

Fei Pan ◽

Sheng Guo Cheng

Keyword(s):

Deformation Mechanism ◽

Traffic Engineering ◽

Soft Rock ◽

Control Technology ◽

Engineering Construction ◽

Deformation Control ◽

High Geostress ◽

Rock Tunnels ◽

Rock Tunnel ◽

And Control

With the development of transportation construction, soft rock tunnel with high geostress construction has become a key problem to overcome of traffic engineering construction. In order to explore the deformation mechanism and control technology of soft rock tunnel with high geostress, Xiakou tunnel engineering as an example, the geological characteristics and deformation characteristics of the tunnel were analyzed, to obtain the deformation mechanism of soft rock tunnels with high geostress, and to develop deformation control technology, the results provide a basis and reference for the domestic and foreign the similar engineering construction.

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Development of Geomechanical Model Similar Material for Soft Rock Tunnels

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.168-170.2249 ◽

2010 ◽

Vol 168-170 ◽

pp. 2249-2253 ◽

Cited By ~ 1

Author(s):

Qin Liu ◽

Shu Cai Li ◽

Li Ping Li ◽

Yan Zhao ◽

Xiao Shuai Yuan

Keyword(s):

Soft Rock ◽

Construction Process ◽

Compressive Test ◽

Geomechanical Model ◽

Original Rock ◽

Uniaxial Compressive Test ◽

Similar Materials ◽

Process Mechanics ◽

Rock Tunnels ◽

Rock Tunnel

Liangshui Tunnel of Lanzhou-Chongqing railway and Tianpingshan Tunnel of Guiyang-Guangzhou railway are the background work. Combining the construction process mechanics of soft rock, uniaxial compressive test, Brazilian test and direct shear test under different material proportion are carried out. After comparing and analyzing the basic physical and mechanical parameters of original rock and model materials, the similar materials for soft rock tunnel are attained. The effect of component proportion on material properties is analyzed. These results provide reliable material guarantee for model test of construction process mechanics in soft rock tunnels.

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Development of a new type of foam concrete and its application on stability analysis of large-span soft rock tunnel

Journal of Central South University ◽

10.1007/s11771-012-1408-4 ◽

2012 ◽

Vol 19 (11) ◽

pp. 3305-3310 ◽

Cited By ~ 12

Author(s):

Hui Wang ◽

Wei-zhong Chen ◽

Xian-jun Tan ◽

Hong-ming Tian ◽

Jun-jie Cao

Keyword(s):

Stability Analysis ◽

Soft Rock ◽

Foam Concrete ◽

Large Span ◽

New Type ◽

Rock Tunnel

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Study on fire risk assessment for underwater soft rock tunnels based on AHP

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/714/2/022039 ◽

2021 ◽

Vol 714 (2) ◽

pp. 022039

Author(s):

Jie Chen

Keyword(s):

Risk Assessment ◽

Soft Rock ◽

Fire Risk ◽

Fire Risk Assessment ◽

Rock Tunnels

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Study on the Mechanical Behavior of Double Primary Support of Soft Rock Tunnel under High Ground Stresses and Large Deformation

Advances in Civil Engineering ◽

10.1155/2020/8832797 ◽

2020 ◽

Vol 2020 ◽

pp. 1-9

Author(s):

Zhe Liu

Keyword(s):

Mechanical Behavior ◽

Large Deformation ◽

Design Method ◽

Characteristic Curve ◽

Soft Rock ◽

Support Design ◽

Deformation Amount ◽

Secondary Lining ◽

Rock Tunnels ◽

Primary Support

Double primary support structures could effectively solve the problem of large deformation of surrounding rock for soft rock tunnels. However, the mechanical behavior of this new support structure is still incomplete, and the design method should be revised. Based on the theory of energy conversion, this paper analyzes the support characteristic curve of double primary support and puts forward the dynamic design method of double primary support. Considering that the secondary lining can be set after monitoring the deformation amount and deformation rate of the first primary support, its support parameters can be dynamically adjusted according to the actual situation. By applying the double primary support design method in the Maoxian tunnel of Chenglan Railway, the field monitoring results show that the double primary support has a significant effect on the energy release of surrounding rocks, greatly reducing the load acting on the secondary lining and ensuring the safety and reliability of the tunnel structure.

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Construction Monitoring and Numerical Simulation of Water-Rich Tuff Soft Rock Tunnel

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/455/1/012163 ◽

2020 ◽

Vol 455 ◽

pp. 012163

Author(s):

Fangliang Chen ◽

Kaihua Zeng ◽

Xuejun Li ◽

Manqing Xu ◽

Hongtao Dai

Keyword(s):

Numerical Simulation ◽

Soft Rock ◽

Construction Monitoring ◽

Rock Tunnel

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Investigation of natural frequencies of axially loaded thin-walled columns

MATEC Web of Conferences ◽

10.1051/matecconf/201821902018 ◽

2018 ◽

Vol 219 ◽

pp. 02018

Author(s):

Łukasz Żmuda-Trzebiatowski

Keyword(s):

Applied Load ◽

Natural Frequencies ◽

Elastic Buckling ◽

Correlation Technique ◽

Buckling Loads ◽

Perfectly Plastic ◽

Linear Buckling ◽

Thin Walled ◽

Elastic Perfectly Plastic ◽

Flexural Torsional Buckling

The paper deals with correlation between natural frequencies of two steel thin-walled columns and the corresponding applied load. The structures are made of cold-formed lipped channel sections. The columns lengths were assumed to follow two buckling patterns – global flexural and flexural-torsional buckling. In the thicker structure two material models were considered – linearly-elastic and elastic-perfectly plastic. Numerical computations cover dynamic eigenvalue problem, linear buckling and geometrically (and materially) non-linear analysis. The correlation between squares of natural frequencies and the applied load is linear in both columns. The first natural frequencies drop to zero due to structural buckling. This method, called the Vibration Correlation Technique, allows to predict buckling loads on the basis of measured vibration frequencies of the structures. Plasticity does not affect the corresponding curves – the use of the presented technique is limited to the structures exhibiting elastic buckling behaviour.

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Judgement Method for Surrounding Rock Stability of Guanjiao Tunnel Based on Catastrophe Theory

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.90-93.2307 ◽

2011 ◽

Vol 90-93 ◽

pp. 2307-2312 ◽

Cited By ~ 2

Author(s):

Wen Jiang Li ◽

Su Min Zhang ◽

Xian Min Han

Keyword(s):

Plastic Strain ◽

Catastrophe Theory ◽

Soft Rock ◽

Surrounding Rock ◽

In Situ Monitoring ◽

Engineering Practice ◽

Stability Of Surrounding Rock ◽

The Stability ◽

Rock Tunnel

The stability judgement of surrounding rock is one of the key jobs in tunnel engineering. Taking the Erlongdong fault bundle section of Guanjiao Tunnel as the background, the stability of surrounding rock during construction of soft rock tunnel was discussed preliminarily. Based on plastic strain catastrophe theory, and combining numerical results and in-situ data, the limit displacements for stability of surrounding rock were analyzed and obtained corresponding to the in-situ monitoring technology. It shows that the limit displacements obtained corresponds to engineering practice primarily. The plastic strain catastrophe theory under unloading condition provides new thought for ground stability of deep soft rock tunnel and can be good guidance and valuable reference to construction decision making and deformation managing of similar tunnels.

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