基于高精度三维地震反射的水下隧道地质建模

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Abstract Research purposes: The construction of engineering geological models primarily relies on a large amount of drilling data and geological survey results. However, three-dimensional geological models constructed from point-based information often exhibit uneven data distribution and significant blind spots. Survey work for offshore bridge and tunnel projects predominantly relies on two-dimensional linear exploration, heavily dependent on drilling. This approach is characterized by high costs, long cycles, and high operational risks, making it challenging to meet the demands for detailed, rapid, and efficient geological modeling. This paper, based on the Jintang Subsea Tunnel Project of Ningbo-Zhoushan Railway, adopts the offshore three-dimensional seismic reflection method to explore the covered mountain development area in the Ningbo section. By combining stratigraphic interpretation and structural analysis results with drilling data, accurate three-dimensional structural and attribute geological models of the work area are constructed using well-constrained geological modeling techniques. Through three-dimensional visualization technology, the integration and analysis of engineering entities with geological models are achieved, expressing the spatial relationship between complex geological structures and engineering entities. Contact conditions between tunnel excavations and formations as well as structures are analyzed accurately and in three dimensions. This study effectively addresses the limitations of geological modeling in offshore transportation engineering.
Research conclusions: (1) High-precision three-dimensional seismic reflection exploration can effectively identify spatial distribution information of the water bottom, Quaternary strata, underlying bedrock(covered mountain), and adverse geological structures (faults, fractured zones) in tunnel site areas, to provide a new approach for linear geological survey in offshore transportation engineering. (2) Three-dimensional seismic reflection exploration can effectively solve the problems of insufficient basic data, uneven spatial distribution, and blind spots in geological modeling for offshore transportation engineering. Well-constrained geological modeling techniques can enhance modeling accuracy and establish complete underwater spatial geological models, accurately simulating the morphology, position, and spatial contact relationships of formations and structures in the work area, thereby obtaining geological models of formations, structures, and attributes. (3) By integrating and analyzing engineering structural models with detailed three-dimensional geological models, the spatial relationship between complex geological structures and engineering entities can be accurately displayed through three-dimensional visualization technology. This allows for the intuitive analysis of rock and soil geological conditions in tunnel excavations, providing reliable basis and strong support for optimizing route longitudinal section design, BIM design, construction, operation and maintenance, and risk decision-making. (4) The conclusions of this study can provide references for offshore engineering surveys and geological modeling.

Key words： subsea tunnel offshore three-dimensional seismic reflection seismic interpretation three-dimensional geological modeling tunnel geological model

Received: 25 July 2024

PACS:	U25
	P315.9

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Cite this article:

LI Kai. Application Research on Underwater Tunnel Geological Modeling Based on High Precision 3D Seismic Reflection[J]. Journal of Railway Engineering Society, 2024, 41(10): 6-12.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2024/V41/I10/6

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