Experimental study on the damage mechanism of tunnel structure suffering from sulfate attack

Lei, Mingfeng; Peng, Limin; Shi, Chenghua; Wang, Shuying

doi:10.1016/j.tust.2013.01.007

Cited by 55 publications

(38 citation statements)

References 10 publications

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“…Water is a serious problem in tunnel maintenance [1,2]. Water-bearing body (WBB) has been proven to exist behind the tunnel linings of many operational tunnels [3,4]. Moreover, the WBB has also been validated as a source of damage to many tunnel linings, such as water leakage, lining creaks, and concrete deterioration [5,6], and the WBB can be identified as the origin of damage to many tunnel linings in operational tunnels to some extent.…”

Section: Introductionmentioning

confidence: 99%

Vehicle-Borne Transient Electromagnetic Numerical Characteristic Parameter of Water-Bearing Body behind Tunnel Linings

Qian

Liang

et al. 2020

Mathematical Problems in Engineering

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The water-bearing body (WBB) behind tunnel linings has been some of the main causes of damage in operational tunnels. The WBB directly affects the serviceability state of tunnel linings; thus, determining a method to detect this problem is a widely studied issue regarding tunnel maintenance. In this paper, a vehicle-borne transient electromagnetic method (VBTEM) is put forward for the first time to detect WBB behind tunnel linings, and the aim is to fully investigate the transient electromagnetic response and numerical characteristics of the WBB behind tunnel linings. Firstly, the transient electromagnetic response curves of the WBB and surrounding rock are obtained and compared in detail by using the finite element method. Then, taking the distance, thickness, radius, and resistivity of the WBB as variable parameters, the parametric sensitivity rule of the response curve of the WBB is analyzed. Finally, a dimensionless response curve is proposed, a mathematical extraction equation is established, and seven numerical characteristic parameters are proposed and extracted. Based on seven numerical characteristic parameters, the technical parameters of the VBTEM equipment are put forward. The results illustrate that the transient electromagnetic response of the WBB is obviously different from that of surrounding rock. The seven numerical characteristic parameters of the dimensionless curve of the WBB can represent the entire response curve of the WBB. The results reveal that the first time gate of the VBTEM equipment needs to be less than 0.05 μs for short-distance problem, and the time span needs to reach four time spans at least. The research results can provide valuable technical references for the application of VBTEM.

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Section: Introductionmentioning

confidence: 99%

Vehicle-Borne Transient Electromagnetic Numerical Characteristic Parameter of Water-Bearing Body behind Tunnel Linings

Qian

Liang

et al. 2020

Mathematical Problems in Engineering

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“…Sulphate corrosion of porous building materials is caused by sulphate ions that are present for example in subsoil with high level of underground water [11], [12], in salts used for winter maintenance , and in sea water and thus in marine environments [13], where also chloride and magnesium ions are contained. The mechanism of sea water attack on construction materials is very different than what is happening in the case of pure sulphate attack [14].…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Sodium Sulphate Solution Exposure on Properties and Mechanical Resistance of Different Kinds of Renders

Pavlíková¹

2018

Ceramics - Silikaty

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The effect of 5 % water solution of the sodium sulphate and the reference environment of distilled water on changes in mechanical resistance of the commercial dry render mixes was researched in the paper. The prism-shaped specimens cured 28 days in humid and stable conditions were immersed in water or sodium sulphate water solution. At chosen time, the particular specimens were collected, dried to constant mass, and subjected to tests. The maximum time of specimen exposure to moisture or salt action was 168 days. Within the performed experiments, length changes, mass gain, mechanical and basic properties were measured in order to reveal the effect of sulphate corrosion on researched materials. Additionally, pore size distribution measurement and X-Ray CT analysis for the most damaged render were done, in order to characterize the disruptive impact of sulphate solution on porous microstructure of lime-metakaolin-based render. The obtained data revealed the high capacity of porous space of the tested renders for salt storage. For shorter times of exposure to salt action, most of the studied renders exhibited improvement in mechanical resistance. On the other hand, after the full filling of the porous space, the evoked crystallization pressures led to the decrease in mechanical resistance and materials damage. However, one type of studied renders originally designed for restoration of salt laden masonry maintained its excellent mechanical properties even after 168 days of sulphate exposure.

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“…13 Aiming at the boundary characteristics of tunnel lining structure, based on elastic mechanics method, members of the author's research group established a calculation model of concrete cover cracking through building the velocity field of the whole displacement caused by external force. 14,15 For a better understanding of concrete corrosion, many scholars considered the concrete natural characteristics such as non-continuous and heterogeneous, and tried to establish a heterogeneous model to simulate the corrosion cracking of concrete. Started at the gradation of concrete, DU et al established a random aggregate model and studied the corrosion cracking process of concrete from the microscopic view.…”

Section: Introductionmentioning

confidence: 99%

Analytical model of cracking due to rebar corrosion expansion in concrete considering the structure internal force

et al. 2017

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Based on the assumptions of uniform corrosion and linear elastic expansion, an analytical model of cracking due to rebar corrosion expansion in concrete was established, which is able to consider the structure internal force. And then, by means of the complex variable function theory and series expansion technology established by Muskhelishvili, the corresponding stress component functions of concrete around the reinforcement were obtained. Also, a comparative analysis was conducted between the numerical simulation model and present model in this paper. The results show that the calculation results of both methods were consistent with each other, and the numerical deviation was less than 10%, proving that the analytical model established in this paper is reliable.

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Experimental study on the damage mechanism of tunnel structure suffering from sulfate attack

Cited by 55 publications

References 10 publications

Vehicle-Borne Transient Electromagnetic Numerical Characteristic Parameter of Water-Bearing Body behind Tunnel Linings

Vehicle-Borne Transient Electromagnetic Numerical Characteristic Parameter of Water-Bearing Body behind Tunnel Linings

The Effect of the Sodium Sulphate Solution Exposure on Properties and Mechanical Resistance of Different Kinds of Renders

Analytical model of cracking due to rebar corrosion expansion in concrete considering the structure internal force

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