Adaptive control system for grouting pressure stability based on fuzzy algorithm

Chen, Xun; Xu, Lisheng; Meng, Xu

doi:10.3233/jifs-169063

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…This process facilitates the integration of the steel strand enclosed within the corrugated pipe with the surrounding concrete, thereby guaranteeing protection against corrosion for the steel strand [5,6]. Although the current technology and equipment for pouring concrete slurry are relatively mature [7][8][9][10][11], as the span of the bridge continues to increase, the transmission distance of the slurry in the corrugated pipe also becomes longer. Especially when there are design flaws in the exhaust hole configuration or irregularities in the construction process, grouting defects are prone to occur in corrugated pipes.…”

Section: Introductionmentioning

confidence: 99%

Finite-Element Performance Degradation Behavior of a Suspension Prestressed Concrete Arch Bridge with Grouting Defects

Gong,

Sun,

Chen

et al. 2024

Buildings

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In response to the difficulty in effectively dealing with grouting defects in corrugated pipes within a suspension prestressed concrete arch bridge, a method for assessing the deterioration in the performance of prestressed concrete girders afflicted with grouting defects was established in the present study. Specifically, a time-varying model of steel strand corrosion within grouting defects was constructed by investigating the corrosion theory of steel strands. In addition, a full-scale numerical simulation model of the long-span prestressed concrete bridge was established based on a practical project. Through the described means, the long-term impact of steel strand corrosion at various locations, lengths, and quantities on the vertical displacement and axial stress of girders was elucidated. The results reveal that in the presence of corrosion affecting 16 steel strands located in the midspan bottom plate, a vertical displacement alteration of 17.55 mm was observed in the midpoint region of the girder over a 30-year period following the bridge’s construction. Further, when considering the combined effects of concrete shrinkage, creep, and the corrosion of 16 steel strands in the midspan bottom plate, the axial compressive stress within the midpoint region of the girder decreased from an initial 6.30 MPa to 0.79 MPa over the same 30-year timeframe post-construction. It was observed that two indicators of vertical displacement and axial stress can be employed to evaluate the performance degradation of prestressed concrete bridge girders with grouting defects. The present findings may provide a reference for the operation and management of bridges with grouting defects.

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Section: Introductionmentioning

confidence: 99%

Finite-Element Performance Degradation Behavior of a Suspension Prestressed Concrete Arch Bridge with Grouting Defects

Gong,

Sun,

Chen

et al. 2024

Buildings

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“…Especially under high pressure grouting conditions, microfractures will deform under the action of grouting pressure, which will cause changes in the seepage characteristics of the slurry [28][29][30][31]. Existing grouting seepage simulations lack descriptions of fracture deformation and slurry seepage characteristics under high pressure grouting conditions and are not suitable for the simulation of microfractured high pressure grouting slurry seepage characteristics [32][33][34]. Therefore, studying the seepage characteristics of high pressure grouting on microfractures considering fluid-solid coupling is of great significance to the study of grouting in microfractured rock masses [35].…”

Section: Introductionmentioning

confidence: 99%

Study on Seepage Simulation of High Pressure Grouting in Microfractured Rock Mass

Wang

Ren

et al. 2021

Geofluids

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In coal mines, under high in situ stress and strong mining activity, roadway surrounding rock commonly contains large amounts of larger fractures and microfractures. Along with the large deformation and continuous rheology of the soft rock roadway, the fractures in the surrounding rock are likely to be compressed and closed, forming undeveloped microfractures, which hinder conventional grouting support methods. Based on the fluid-solid coupling between slurry seepage and microfracture deformation, a theoretical model of microfracture grouting seepage is established. A program for the analysis and calculation of microfracture grouting is developed to quantitatively describe the variation in slurry seepage distance and fracture opening. Numerical experiments are carried out to study the grouting seepage of microfractures under different grouting pressures and fracture opening conditions, and the variation rules for the spatial distribution of fracture opening and slurry seepage distance during grouting pressure are obtained. Fluid-solid coupling has a significant influence on grout seepage characteristics. The grouting pressure and the fracture opening changes are nonlinearly attenuated along the grout seepage direction.

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Adaptive control system for grouting pressure stability based on fuzzy algorithm

Cited by 2 publications

References 9 publications

Finite-Element Performance Degradation Behavior of a Suspension Prestressed Concrete Arch Bridge with Grouting Defects

Finite-Element Performance Degradation Behavior of a Suspension Prestressed Concrete Arch Bridge with Grouting Defects

Study on Seepage Simulation of High Pressure Grouting in Microfractured Rock Mass

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