Abstract
This paper describes a case of using a pile‐slab composite foundation to handle a bridge‐end bump problem. Conventionally, a deep‐seated concrete slab method is employed to tackle this problem; however, this method generates a large stress concentration within 1 m from the bridge end. The mechanical bearing capacity of the deep‐seated concrete slab is insufficient and prone to structural damage. Further, the longitudinal slope change rate is also very high. To overcome these limitations and solve the problem, a lower partition slab‐pile foundation treatment method is proposed. The construction of the proposed method is provided, and the results of a case study analyzed by field monitoring and a simulation executed using ABAQUS finite element simulation show good agreement. The results indicate that the mechanical bearing characteristics for the proposed lower partition slab‐pile foundation treatment method are better than the conventional deep‐seated concrete slab method, and therefore, the structure is more resistant to damage. In addition, because the pile foundation enhances the foundation bearing capacity, the longitudinal slope change rate of the new pile‐slab composite foundation is 2.5 times that for the deep‐seated concrete slab technology. Thus, the lower partition slab‐pile foundation treatment method can better deal with the bridge end bump problem.
Highlights
Rock and soil scholars have attached considerable importance to the research on the stability and settlement of soft soil foundations on highways
Shi et al [2, 3] performed a 3-D finite element analysis considering the interaction between the approach slab and the embankment soil, and they found that, when the slab is separated from the soil, the approach slab is under a state of destruction
Chen et al [5] studied the cracking of the approach slab under the load of a vehicle
Summary
Rock and soil scholars have attached considerable importance to the research on the stability and settlement of soft soil foundations on highways. Bakeer et al [13] adopted a treatment method combining the pile foundation and approach concrete slab, which improves the integrity of the treated foundation and has an obvious effect on preventing the bridge end bump caused by poor settlement. Based on the research on the bridge end jumping problem, this paper proposes a new type of soft ground-based highway bridge end jumping treatment technology—lower partition slab-pile foundation—and the reliability of the technology was verified for practical applications. E working characteristics of the lower partition slab-pile foundation were analyzed and compared with the previous different treatment technologies, which verified the effectiveness of the technology It provides a reference for the handling of the bridge end bump problem in the future
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