3D geological modeling and engineering properties of shallow superficial deposits: A case study in Beijing, China. (June 2020)

• Record Type: Journal Article
• Authors: He, Hanhan; He, Jing; Xiao, Jingze; Zhou, Yuanxin; Liu, Yv; Li, Chao
• Is Part Of: Tunnelling and underground space technology. Volume 100(2020)
• Publication Date: 2020-06
• Subjects: 3D geological model -- Geotechnical properties -- Cross-sections -- Horizons-to-solids -- Boreholes -- Beijing City; Tunneling -- Periodicals; Underground construction -- Periodicals; Tunnels -- Periodicals; Underground areas -- Periodicals; 624.193
• DOI: 10.1016/j.tust.2020.103390
• Languages: English
• ISSNs: 0886-7798

Abstract

Highlights: Cross-sections combined with "horizons-to-solids" algorithm are recommended for 3D modeling in complicated alluvial systems. A coupled 3D model of geological sequences and geotechnical properties of subsoils in Beijing has been built. Shallow silty clay in Beijing is of low plasticity. Clayey soils up to 10 m depth in Beijing present medium to high compressibility. Abstract: Three-dimensional (3D) geological modeling has been developed in recent decades to overcome the complex nature of shallow superficial deposits in urban areas as a result of urbanized advancement. To meet the requirements of 3D geological models in the urban underground space construction in Beijing City, we constructed a coupled 3D model of geological sequences setting up to 50 m from the surface, and geotechnical properties of subsoils in Beijing for the first time via Creatar Xmodeling software. The modeling relies on 107 intersecting cross-sections and the horizons-to-solids approach aims to provide an insight into related modeling projects, especially in a complicated alluvial environment. In this paper, we described detailed modeling procedures, exhibited the outputs from the 3D model (combined geological units, cross-sections or fence diagrams, and properties presented in the form of horizontal distribution maps), and analyzed typical engineering properties of silty clay and clay units. The achieved 3D attributed model provides geologists an effective method to visualize the property characteristics of each layer and the potential connections between them, thereby to predict underground conditions and to reduce risks in geotechnical engineering processes such as urban underground constructions.