Required jacking force for deviation rectification of inclined structures supported with rigid piles

Abstract

Light poles or transmission towers may become tilted over the design life, which needs rectifying considering safety and continued use. The jacking pushing method is an efficient way to rectify deviations of these inclined structures supported with rigid piles, but there is a lack of relevant engineering standards and research in this aspect. In this study, a numerical method using FLAC3D is proposed to estimate the required jacking force at the pile top to plumb inclined piles in cohesive soils. Good agreements between the results obtained from the present numerical models and those taken from published experimental and numerical results suggest the reliability of the conclusion. Besides, elaborate parameter analyses including pile geometry, soil properties, and properties of the soil-pile interface are conducted to investigate their influences on the required jacking force. The results can contribute to a safer and more cost-efficient design for rectifying deviations of rigid inclined piles, especially in terms of the required jacking force.

Quality Risk Perception of Rectification and Reinforcement in a High-Rise Building under Uncertainty

“…Xiao et al [7] introduced plane strain numerical simulation to systematically probe the under-excavation mechanism for building rectification, and derived the two key parameters of optimal hole spacing and hole diameter. Chai et al [8] estimated the jacking force required for the rectification of rigid inclined piles in cohesive soil using the FLAC 3D numerical method and carried out a detailed parametric analysis, which provided a basis for safer and more economical rectification design. The above literature focuses on the research at the technical level: one is to propose an innovative rectification and reinforcement scheme based on the analysis of the causes of uneven settlement of the foundation under complex conditions [4,5]; the other is to pay more attention to the mechanism behind the deviation rectification and provide scientific theoretical formulas for the rectification design [6][7][8].…”

“…Chai et al [8] estimated the jacking force required for the rectification of rigid inclined piles in cohesive soil using the FLAC 3D numerical method and carried out a detailed parametric analysis, which provided a basis for safer and more economical rectification design. The above literature focuses on the research at the technical level: one is to propose an innovative rectification and reinforcement scheme based on the analysis of the causes of uneven settlement of the foundation under complex conditions [4,5]; the other is to pay more attention to the mechanism behind the deviation rectification and provide scientific theoretical formulas for the rectification design [6][7][8]. However, there have been very few studies on the identification of potential risk factors for building rectification and reinforcement and the impact of these risk factors on construction quality.…”

“…The edge probability of a node can be determined by the fuzzy marginalization rule as shown in Equation (7), which allows for the prediction of the probability of a risky event. Sensitivity analysis is used to explore the effect of small changes in inputs on system performance, quantified by the sensitivity performance measure (SPM), as shown in Equation (8). When SPM is close to 1, X i is more likely to be the direct cause of accident Y.…”

An Experimental Study on Strengthening Recycled Aggregates Considering Dry Mixing before Slurry Coating

“…Construction wastes can be generated during the engineering process or come from demolished buildings due to urban development or unsafe factors [1][2][3]. Moreover, a large number of construction wastes result from natural hazards [4], including earthquakes, landslides, debris flow, etc.…”