3D Geological Model of a Tunnel for Improving Construction Measures: A Case Study

As the demand for information technology in tunnel construction continues to increase, geological three-dimensional visualization methods have become the forefront of tunnel construction research. This paper analyzes the requirements and main issues faced in three-dimensional modeling for tunnel engineering. To meet the high precision and high timeliness requirements of geological modeling in tunnel engineering, this study establishes a rapid three-dimensional reconstruction method for tunnel engineering models based on geological feature points and line data. Line data is used to construct the model boundaries, while point data is utilized for internal geological description through local Kriging interpolation. The adoption of a unified data format effectively improves the modeling speed. This modeling method integrates advanced geological prediction data, significantly enhancing the model's accuracy. Through the three-dimensional geological model, the geological conditions ahead of the tunnel face are analyzed. The information presented in the three-dimensional geological model is validated through drilling verification and found to be accurate. Subsequently, based on the information obtained from the three-dimensional geological model, the tunnel construction scheme is optimized. Additional localized radial grouting measures are supplemented on the basis of continuous advance peripheral grouting. As a result, tunnel safety construction is achieved by reducing the high geological risk length, thereby shortening the construction period. The approach presented in this paper can be widely applied in relevant tunnels and underground engineering projects.