Experimental Investigations of a Tunnel Lining Segment Strengthened by In Situ Spraying Mortar

Wang, Fuzhi; Zeng, Cong; Ma, Baosong; Gong, Chenkun; Liao, Baoyong; Zhao, Yahong; Ma, Chao; Kong, Yaozu

doi:10.3390/app12083722

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…Wang carried out an experimental study on the durability of engineered cementitious composites (ECC) exposed to sewage environments, simulated by treatments including sulfuric acid exposure and physical erosion [10].The results showed that the residual compressive and tensile strengths of ECC were 30-65% and 300-370% higher than those of the mortar group after 12 corrosion cycles. Wang systematically tested the basic properties of H-70 mortar material [11]. However, with the development of urban drainage pipelines, a large number of inservice pipelines have aged and fallen into disrepair.…”

Section: Introductionmentioning

confidence: 99%

Study of the Structural Mechanical Properties of Drainage Canals Rehabilitated by Spraying Method

et al. 2022

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A large number of drainage pipes and canals in China have been in disrepair for a long time and there have been problems such as leakage and corrosion. In response to these problems, this paper studies a non-excavation technology for repairing the arched canal structure—the in-situ spraying method. To study the influence of the original canal structure on the mechanical characteristics of the lining structure by in-situ spraying and the restraint effect on the lining structure, a field model test with a similar ratio of 1:2 was conducted in the field test pit. By conducting four stages of three-point concentrated load loading tests, the mechanical characteristics of the lining structure were investigated to reveal the influence of the canal structure on the force of the lining structure. The test results show that: the maximum crack width of the newly added lining structure is 0.27 mm and the normal service ultimate bearing capacity of the arched structure repaired by H-70 reaches 150 kN; comparing the loading test and the numerical simulation results, the difference between the two vault displacement results is 4.65% and the results are relatively consistent. The displacement of the bottom of the lining structure is small and the participation of the bottom plate is small, while the displacement of the upper arch structure of the lining is significantly larger than the lateral displacement, indicating that the canal structure can effectively limit the lateral displacement of the newly added lining and that the canal structure is greatly reduced. The bending moment of the lining structure is improved and the restraint effect on the arch foot is more obvious. This paper proposes the use of H-70 to repair arched canal structures by the in-situ spraying method and seeks to prove the feasibility of this method and fill the gap of research in this area. This paper provides the structural design basis and experimental knowledge for the construction of the repair method, which has important practical significance for the pipeline repair project in the future.

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Section: Introductionmentioning

confidence: 99%

Study of the Structural Mechanical Properties of Drainage Canals Rehabilitated by Spraying Method

et al. 2022

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An Overview of the Application of Fiber-Reinforced Cementitious Composites in Spray Repair of Drainage Pipes

et al. 2023

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The structural performance of buried drainage pipes is gradually deteriorating under the influence of external loads and chemical and microbial corrosion. It is crucial to reinforce them and improve their bearing capacity for safe use. One of the important technologies used to extend the service life of deteriorated pipes is the use of fiber-reinforced cementitious composites (FRCC) for spray repair. Combined with the current situation of drainage pipes, this article introduces the basic properties of FRCC, briefly describes the requirements for material performance for drainage pipe spraying rehabilitation, reviews the structural bearing capacity of drainage pipes repaired by spraying with FRCC, and discusses the relevant research and engineering applications of the spraying method. Studies show that FRCC has high strength and corrosion resistance, and excellent sprayability. The structural performance of the host pipe is significantly improved after repair, but measures should be taken to enhance the interfacial bonding performance during the repair. In the design of the liner wall thickness, there is no unified calculation theory, and the existing methods have not considered the influence of secondary load on the structure. It is recommended to combine the type of pipe defects and the degree of deterioration in further study.

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Experimental Investigations of a Tunnel Lining Segment Strengthened by In Situ Spraying Mortar

Cited by 2 publications

References 11 publications

Study of the Structural Mechanical Properties of Drainage Canals Rehabilitated by Spraying Method

Study of the Structural Mechanical Properties of Drainage Canals Rehabilitated by Spraying Method

An Overview of the Application of Fiber-Reinforced Cementitious Composites in Spray Repair of Drainage Pipes

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