Assessment of steel-fiber-reinforced segmental lining of Chamshir water conveyance tunnel, Iran: Integrating laboratory experiments, field observations, and numerical analysis

Ezazi, Mohammad; Hossaini, Mohammad Farouq; Sheikhmali, Rasoul; Khosrotash, Mohammad; Sharifi Teshnizi, Ebrahim; O’Kelly, Brendan C.

doi:10.1016/j.cscm.2024.e03144

Cited by 1 publication

(1 citation statement)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect of crack width on the corrosion rate of reinforcement was numerically analyzed by Xu [13]. The segment simulations were directed at investigating concentrated loading, representative of the jack thrust force applied while installing the segments during the tunnel boring machine (TBM) installation phase [14]. A numerical investigation is conducted here to study the mechanical behavior of continuous-joint shield tunnels, strengthened by the SPCC strengthening technique [15].…”

Section: Introductionmentioning

confidence: 99%

Study on the Fracture of a Shield Segment in a Fully Excavated Hard Rock Section under the Influence of Construction Loads

Zhu,

Zheng,

Ren

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

In this paper, the initiation of the fracture of a segment caused by the pressure of the jack and other factors during shield construction is discussed. Based on the Rots model in the finite element software Diana 10.4, the fracture width is solved. Combined with in situ measurements, the mechanisms of concrete fracturing of a segment under external loads, such as the jack thrust deflection angle and uneven jack thrust caused by the changes in the segment due to the upward buoyancy and shield attitude, are studied; additionally, the occurrence conditions and engineering control measures for segment fracture are summarized. The results show that when the attitudes of the shield and segment are identical, the total thrust of the shield is recommended not to exceed 21,000 kN, and is strictly limited to 24,000 kN. When the attitude inclination angle between the shield machine and the segment is less than 1°, the impact on the segment quality is small. When the inclination angle reaches 2°, the total thrust of the shield is recommended not to exceed 16,000 kN, and is strictly limited to 18,000 kN. When the inclination reaches 3°, a fracture is easily produced. When the total thrust is 19,000 kN, it is recommended that the loading increase or decrease in the left and right four grippers should not exceed 20%, and they are prohibited to exceed 30%. The fracture width increases exponentially with the increase in misalignment between adjacent segment rings. These research results provide a theoretical basis for jack pressure control during shield construction.

show abstract

Section: Introductionmentioning

confidence: 99%