PURPOSES : This study is a method for developing a 3D stratum modeling that uses Civil3D, CAD, Revit, and Dynamo, the products of Autodesk and ground survey data to prevent reversal and applying BIM design to underground structures.
METHODS : If the ground level difference is severe and the survey data is not sufficiently spaced, a reversal phenomenon occurs such that the stratum is generated above the surface ground. In such cases, the first layer of the stratum can be offset from the ground surface and the remaining layers are created and utilized by the stratum thickness. However, the first layer is just offset from the ground surface, which is not an accurate implementation of geological information. To fix this error, we propose a method to calculate the quantity in 3D based on the algorithm that generates the stratum underneath the original ground surface connected with borehole data.
RESULTS : The 3D stratum is designed to be implemented within 30 min with minimum memory resource occupancy. The ground surface is generally based on a digital map and can be linked with a drone and 3D scan data afterwards. The stratum model for each layer can be implemented in both a triangulated irregular network (TIN) and solid for quantity and volume calculations. Each layer will be generated in selected colors, and analysis on altitude, gradients, etc. can be performed with it.
CONCLUSIONS : Constructing 3D spatial information using 2D information is expected to lay the foundation for providing required services in construction, real estate, architecture, urban planning, and transportation in the future, to users with integration and convergence into various fields such as BIM, smart city, digital twin, and VR-AR.

ABSTRACT
1. 서론
    1.1. 개발 배경
    1.2. 개발 목표
2. 지층 관련 프로그램 현황
    2.1. 지반 해석 S/W
    2.2. 3차원 지층 모델링 S/W
    2.3. 기존 3차원 지층 모델의 문제점
3. 지층 구현 프로세스
    3.1. 활용 프로그램
    3.2. 개발 프로세스
    3.3. 지층 역전 보정
    3.4. 수량 산출
4. 지표면 생성
    4.1. 지반조사 데이터 획득
    4.2. 지표면 좌표 처리
5. 3차원 지층 모델링
    5.1. 입력 데이터 처리
    5.2. 보링 데이터 확장
    5.3. 지층 곡선화
    5.4. 역전층 처리
    5.5. 층별 지층 구현
6. 지하구조물 BIM 설계 적용 방안
    6.1. 터널 굴착모델 생성
    6.2. Solid 및 TIN 구현
    6.3. 수량 산출 방안
7. 결론
REFERENCES

• 최형래(삼보기술단 기획실) | Choi Hyunglae 교신저자
• 장경수(삼보기술단 BIM팀) | Jang Kyungsoo
• 이윤경(삼보기술단 BIM팀) | Lee Yoonyoung