[논문]터널근접시공에 의한 말뚝의 거동을 고려한 플랫폼 기반의 예비 설계 가이드라인에 대한 연구

전영진; 이규설; 이재철; 바트보양; 이철주

doi:10.9711/ktaj.2022.24.2.129

터널근접시공에 의한 말뚝의 거동을 고려한 플랫폼 기반의 예비 설계 가이드라인에 대한 연구
A study on platform-based preliminary design guidelines associated with the behaviour of piles to adjacent tunnelling 원문보기

Journal of Korean Tunnelling and Underground Space Association = 한국터널지하공간학회논문집, v.24 no.2, 2022년, pp.129 - 151

전영진 (한국건설기술연구원) , 이규설 (신영종합건설) , 이재철 (강원대학교 신산업개발 T-EMS 융합학과) , 바트보양 (강원대학교 토목공학과) , 이철주 (강원대학교 토목공학과)

초록
AI-Helper

본 연구에서는 기초판으로 연결된 군말뚝 형태의 기초 하부를 터널이 근접 통과할 경우 이로 인해 발생하는 말뚝의 거동을 파악하기 위하여 3차원 유한요소해석을 수행하였다. 이때 터널과 말뚝기초 사이의 지반보강을 조건별로 고려하여 수치해석을 수행함으로써 결과를 분석하였다. 수치해석에서는 터널 굴착으로 발생하는 말뚝의 침하, 축력, 전단응력 및 상대변위를 고찰하였으며, 추가적으로 IoT 플랫폼 예비 설계 가이드라인을 제시하였다. 지반보강을 고려하지 않으며 터널로부터 이격거리가 가장 가까운 말뚝은 지반보강을 가장 크게 고려하고 터널로부터 이격거리가 가장 멀리 존재한 말뚝에 비해 말뚝두부의 침하가 약 70% 크게 발생하였다. 또한, 말뚝 품질관리 요소 데이터는 수집 및 정제과정을 통해 다양한 형태의 API (Application Programming Interface)로 제공되었으며, 각 데이터 플로우 프로세스를 정의하여 데이터가 생성되는 시점에 따라 적합한 API를 제공하는 것이 중요한 것으로 분석되었다. 본 연구를 통하여 기초판으로 연결된 군말뚝의 거동에 영향을 미치는 주요 인자를 보강조건에 따라 심도 있게 고찰하고, 말뚝의 품질관리 IoT 플랫폼을 제시하였다.

Abstract ▼ AI-Helper

In the current work, a series of three-dimensional finite element analyses have been carried out to understand the behaviour of piles when the adjacent tunnelling passes underneath grouped piles with a reinforced pile cap. In the current study, the numerical analysis studied the computed results regarding the ground reinforcement condition between the tunnel and pile foundation. In addition, several key issues, such as the pile settlements, the axial pile forces, the shear stresses and the relative displacements have been thoroughly analysed, and the IoT platform based preliminary design guidelines were also presented. The pile head settlements of the nearest pile from the tunnel without the ground reinforcement increased by about 70% compared to the farthest pile from the tunnel with the maximum level of reinforcement. The quality management factor data of the piles were provided as API (Application Programming Interface) of various forms by the collection and refinement. Hence it has been shown that it would be important to provide the appropriate API by defining the each of data flow process when the data were created. The behaviour of the grouped piles with the pile cap, depending on the amount of ground reinforcement, has been extensively analysed, and the IoT platform regarding the quality management of piles has been suggested.

주제어

표/그림 (21)

그림 Fig. 1. Relative tunnel-pile configurations observed in practice (Pang, 2006)
그림 Fig. 2. A representative 3D finite element mesh used in the current study (a 4 × 3 pile group, D: tunnel diameter)
그림 Fig. 3. Sectional view of analysis geometry
그림 Fig. 4. Longitudinal section of analysis geometry
표 Table 1. Summary of numerical analyses
그림 Fig. 5. Location of piles inside a 4 × 3 pile group
표 Table 2. Summary of the location and condition of the pile
표 Table 3. Material parameters assumed in the numerical modelling
그림 Fig. 6. Location of piles inside a 4 × 3 pile group
그림 Fig. 7. Relation of axial pile forces and pile head settlements
그림 Fig. 8. Distributions of normalised pile head and soil surface settlements with tunnel advancement (δ_gr,max = 8.93 mm)
그림 Fig. 9. Distributions of normalized axial pile forces with depth
그림 Fig. 10. Distributions of normalized axial pile forces with depth
그림 Fig. 11. Distributions of normalised tunnelling-induced axial pile forces with depth
표 Table 4. Computed maximum axial pile forces
그림 Fig. 12. Distributions of interface shear stresses with depth
그림 Fig. 13. Distributions of interface shear stresses with depth
그림 Fig. 14. Distributions of tunnelling-induced interface shear stresses with depth
그림 Fig. 15. Distributions of relative displacements with depth
그림 Fig. 16. Distributions of tunnelling-induced relative displacements at the pile-soil interface with depth
표 Table 5. A standard of judgment for selected development of framework interface

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