Surrogate models for the prediction of damage in reinforced concrete tunnels under internal water pressure

Considering reinforced concrete lining often using in underground diversion tunnels as permeable media and combining concrete smeared cracking model, equivalent continuum porous saturated hydro-mechanical coupling model of lining is established based on generalized Biot’s theory. Reinforcement in concrete structures is typically provided by means of rebars which are embedded in the concrete. Then the model is applied to analyze lining structures of Jinping diversion tunnels during excavation and operation processes in which high external and internal water pressure would play a dominant role in affecting the behavior of lining respectively. Coupling research are carried out to analyze some important factors that would influence the hydro-mechanical behavior of lining and surrounding rock mass such as decreased orders of hydraulic conductivity magnitude of grouting zone, internal water pressure acting as body force and existing cracks in the lining, and the results shows that grouting zone of good quality and sufficient measurement for preventing the cracks from initiation and coalescence in the lining are important for the construction and operation of the diversion tunnels.

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Thermoplastics piping systems. End-load-bearing joints between small diameter pressure pipes and fittings. Test method for leaktightness under internal water pressure, including end thrust

10.3403/00560203u ◽

2015 ◽

Keyword(s):

Water Pressure ◽

Small Diameter ◽

Test Method ◽

Load Bearing ◽

Internal Water ◽

Pressure Pipes ◽

Piping Systems

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Simulation Analysis for Reinforced Concrete Aqueduct of Lijia Pumping Station

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.488-489.605 ◽

2014 ◽

Vol 488-489 ◽

pp. 605-608

Author(s):

Xiang Zan Xie

Keyword(s):

Reinforced Concrete ◽

Simulation Analysis ◽

Water Pressure ◽

Water Diversion ◽

Distribution Law ◽

Masonry Arch ◽

Pumping Station ◽

Earthquake Effect ◽

Concrete Masonry ◽

Cushion Layer

Reinforced concrete masonry arch aqueduct is a common water diversion engineering structure. Aqueduct is decorated on the concrete cushion layer, cushion layer effects on masonry arch, the structures stress is uniform, carrying capacity is strong. This paper adopts finite element method to carry out force analysis for reinforced concrete masonry arch aqueduct of Lijia pumping station, considering aqueduct weight, water pressure and earthquake effect, etc. Researching stress and deformation distribution law of reinforced concrete masonry arch aqueduct.

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Reasonable design method of shield tunnel lining under internal water pressure

Modern Tunneling Science and Technology ◽

10.1201/9781003077534-45 ◽

2020 ◽

pp. 857-860

Author(s):

N. Okano ◽

S. Konishi ◽

K. Kobayashi ◽

A. Koenuma ◽

K. Ohishi ◽

...

Keyword(s):

Design Method ◽

Water Pressure ◽

Tunnel Lining ◽

Shield Tunnel ◽

Internal Water

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Design and Impermeability of High Durability Reinforced Concrete Segment

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.174-177.1199 ◽

2012 ◽

Vol 174-177 ◽

pp. 1199-1203

Author(s):

Xin'gang Wang ◽

Fang Bin Chen ◽

Xu Na Ye ◽

Wei Qin Zhang

Keyword(s):

Diffusion Coefficient ◽

Reinforced Concrete ◽

Water Pressure ◽

Chloride Ion ◽

Concrete Cover ◽

Chloride Diffusion ◽

Shield Tunnel ◽

Main Body ◽

Chloride Diffusion Coefficient ◽

High Durability

Reinforced concrete segment is the main body of structure in shield tunnel, and its durability has an important effect on shield tunnel. The durability of High Durability Reinforced Concrete Segment (abbr. HDRC Segment) was investigated by impermeability of single segment and chloride diffusion coefficient of core-drilling. HDRC Segment had high compact cover, concrete cover and high strength structural-layer. Permeable height of HDRC Segment was approximately 0.5 mm when Keeping 4 hours in the constant water pressure of 0.8 MPa, and chloride diffusion coefficient of HDRC Segment was only 4.9×10－13m2/s by NEL method. As for Water impermeability and chloride ion penetration resistance, HDRC Segment is far superior to those of conventional Reinforced Concrete Segment (abbr. conventional RC Segment). It is advantageous to increase durability of HDRC Segment and service life of tunnel engineering.

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