Experimental investigation of the ultimate bearing capacity of deformed segmental tunnel linings strengthened by epoxy-bonded filament wound profiles

Liu, Xian; Jiang, Zijie; Zhang, Lele

doi:10.1080/15732479.2016.1260601

Cited by 29 publications

(12 citation statements)

References 2 publications

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“…Early tests focused on the bearing capacity of standard single rings [52]. They were followed by tests on strengthened single rings with the help of steel shells [53], filament wound profiles [54], steel-concrete composites [55], and Ultra-High Performance Concrete (UHPC) [56]. In case of insignificant ring-to-ring interaction, it is reasonable to restrict the experimental investigations to tests of single rings [57].…”

Section: Experimental Datamentioning

confidence: 99%

On the added value of multi-scale modeling of concrete

Zhang

Binder

Wang

et al. 2022

Front. Struct. Civ. Eng.

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This review of the added value of multi-scale modeling of concrete is based on three representative examples. The first one is concerned with the analysis of experimental data, taken from four high-dynamic tests. The structural nature of the high-dynamic strength increase can be explained by using a multi-scale model. It accounts for the microstructure of the specimens. The second example refers to multi-scale thermoelastic analysis of concrete pavements, subjected to solar heating. A sensitivity analysis with respect to the internal relative humidity (RH) of concrete has underlined the great importance of the RH for an assessment of the risk of microcracking of concrete. The third example deals with multi-scale structural analysis of a real-scale test of a segmental tunnel ring. It has turned out that multi-scale modeling of concrete enables more reliable predictions of crack opening displacements in tunnel segments than macroscopic models taken from codes of practice. Overall, it is concluded that multi-scale models have indeed a significant added value. However, its degree varies with these examples. In any case, it can be assessed by means of a comparison of the results from three sources, namely, multi-scale structural analysis, conventional structural analysis, and experiments.

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Section: Experimental Datamentioning

confidence: 99%

On the added value of multi-scale modeling of concrete

Zhang

Binder

Wang

et al. 2022

Front. Struct. Civ. Eng.

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“…More recently, experimental research and numerical analysis of the mechanical properties of reinforced concrete linings have been performed [14,60]. Loading tests of multiring assembled linings were carried out successively [61][62][63]. Compared with similar failure tests characterized by an instability failure mode, establishing predictions for lining failure based on the change rate of the tunnel diameter and ultimate displacement was proposed [61].…”

Section: Investigation Of Mechanical Properties and Failurementioning

confidence: 99%

“…Compared with similar failure tests characterized by an instability failure mode, establishing predictions for lining failure based on the change rate of the tunnel diameter and ultimate displacement was proposed [61]. Failure of the lining joints eventually led to a failure in the overall linings, but no significant damage occurred to the lining itself [62,63]. A numerical simulation of the continuous failure process of the lining caused by local failure was performed.…”

Section: Investigation Of Mechanical Properties and Failurementioning

confidence: 99%

“…e design of linings should focus on the weak positions rather than the overall structure, such as on lining joints, because it is often damaged at weak positions that lead to lining failure. Moreover, early warning Advances in Civil Engineering mechanisms (EWMs) should be established [63,93]. Once the critical value of local damage reaches point B, an early warning response (EWR) is initiated and the corresponding countermeasures are taken.…”

Section: Future Workmentioning

confidence: 99%

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State‐of‐the‐Art Review on Failure Mechanism and Waterproofing Performance of Linings for Shield Tunnels

Tang

2022

Advances in Civil Engineering

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The introduction and development of shield tunnels have led to the innovation of precast segmental linings, which has significant advantages in improving the construction speed compared with in-situ cast concrete linings. However, damage of the linings and water leakage at the lining joints highlight defects in the design and construction of the linings. In this regard, it is necessary to investigate the failure mechanism of linings for shield tunnels and evaluate the waterproofing performance and repercussions of lining joints. The relevant research results published in recent years are reviewed in this paper, focusing on the failure mechanisms of linings and the waterproofing performance of lining joints. Progressive failure and instability of linings are introduced. Progressive failure has three stages: initial elastic stage, local damage stage, and overall failure stage. The performance-based design of joint waterproofing is described in seven steps. Further opportunities for the investigation of this topic are discussed.

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“…Studies show that structure strengthening is an effective treatment for the vault void problem. Currently, structure strengthening methods can be mainly divided into three categories, including pasting a high-strength fiber layer [14,15], sticking a steel plate [16][17][18][19][20], and constructing an umbrella arch [21,22]. In an operating highway tunnel with a void problem, numerous auxiliary facilities such as lighting and fans are installed near the vault, limiting the available space margin for the strengthened structure.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Mechanical Properties of Vault Void Lining in Highway Tunnels and Steel Plate Strengthening

Shao

Zhang

et al. 2022

Applied Sciences

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In the present study, large-scale specimens based on the tunnel prototype were prepared and static load tests were carried out to investigate the damage caused by lining voids. Based on the strengthening scheme of the tunnel, the strengthened specimens were prepared to explore the strengthening effect on the strengthening structure. The strengthening structure is made of a steel plate fixed with chemical anchor bolts and two-component epoxy adhesive. By analyzing the failure mode, structural deformation, and the relationship between load and strain, the damage caused by vault void with various void heights was analyzed and the obtained results were verified through the experiment. Moreover, the enhancement of the bearing capacity and stiffness of the structure strengthened by surface bonding steel was studied. The obtained results show that the damage caused by the lining void mainly occurs at the void boundary. The damage appears as multiple longitudinal cracks. The crack starts from the lower surface and develops radially. Using chemical anchor bolts and two-component epoxy adhesive to bond the steel plate on the lining surface, the damage can be reduced, and the bearing capacity of the structure can be improved effectively when the void height is a quarter of the second lining thickness, the number of cracks is reduced from 14 to 5 after steel plate strengthening, and the length of the longest crack is reduced from 13.2 cm to 8.3 cm, reduced by 37.12%. The steel plate strengthening also reduces the strain of the lower steel bar at the void boundary from 1130.58 με to 555.12 με, and the strain decreases by 50.89%. The experimental results show that the position where the void has the greatest impact on the lining is at the void boundary. Therefore, when steel plates are used to strengthen the void lining, the void boundary should be emphasized, which makes the strengthening more accurate and saves the cost of treatment.

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Experimental investigation of the ultimate bearing capacity of deformed segmental tunnel linings strengthened by epoxy-bonded filament wound profiles

Cited by 29 publications

References 2 publications

On the added value of multi-scale modeling of concrete

On the added value of multi-scale modeling of concrete

State‐of‐the‐Art Review on Failure Mechanism and Waterproofing Performance of Linings for Shield Tunnels

Experimental Investigation on the Mechanical Properties of Vault Void Lining in Highway Tunnels and Steel Plate Strengthening

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