Projects

Along with the development of the city, the urban built-up area has produced the shortage of infrastructure supply, road traffic congestion, the contradiction between people and vehicles and other problems, intensifying the existing urban (underground) space and the people's demand for urban (underground) space supply and demand imbalance contradiction. At the same time, urban built-up areas as a multi-interest community, the conflicting interests and needs of different subjects make it impossible or difficult for the hard-conditioned control and detailed planning to give a comprehensive solution, and reasonable coordination has become a difficult and painful point in how to layout new underground space and optimize existing underground space. Based on this understanding, this study takes the Qinglianshan area of Nanjing as an example and discusses the following two points: 1. how to build a practical exercise sandbox - CIM tool platform for urban underground space planning and design using both data and models; 2. how to quantitatively decouple the diverse, high-dimensional and complex coupling realities from a disciplinary perspective.

Urban underground space (UUS) has developed rapidly in recent years, however, a number of problems have been revealed. There is a certain lag in the current planning and control of underground space. In particular, as underground space is dug out of geological bodies for construction, the accompanying geological disturbance to the surrounding urban environment cannot be ignored, and the impact of geological bodies on underground space must be considered in advance of planning truncation. In this study we intend to propose a method for building the 3D geological model from multi-source data using Kriging interpolation algorithm combined with the Parallel truncated grid. A mapping algorithm from the 3D geological model to the numerical calculation is established based on the idea of the numerical manifold method (NMM), which allows complex soil properties to serve the engineering computational analysis. We will present evaluation algorithm for geological disturbance and idiscusse measures for eological disturbance applied to UUS planning. The method proposed in this study will help to frontload engineering thinking in the planning phase, to characterize the impact of geological properties on underground space development and to provide a fast algorithm that can be applied to specific projects.

As a typical discontinuous and heterogeneous material, the essence of rock is a set of crystals and amorphous particles bonded by different kinds of cementing materials. Macroscopic mechanical behavior and failure process of rock depend on each of its microstructure characteristics. In this study, we build a method that can construct the mesh based on rock texture images using Voronoi diagrams, adaptively adjust the Voronoi mesh according to the image features, and finally obtain an image-based numerical model with Voronoi mesh and controllable complexity. Furthermore, by using cohesive mesh to simulate the boundaries of different grains in the rock and assigning different mechanical parameters to the different grains and their boundaries, we completed the numerical simulation of uniaxial compression of multi-mineral rocks in the NDDA framework.

The surrounding environment of the waterway (pit) is complex, spanning over two metro tunnels, close to bridge and shallow foundation buildings. The primary target for this project is to ensure construction safety and reduce the impact on the surrounding environment. In this study we have used digital twin technology to enable the extrapolation and prediction of impact zones to guide the selection and deployment of sensors in the field in a positive way. Likewise, a simulation-based assessment of the process methodology was implemented in conjunction with feedback from the field monitoring data. The project was planned to last for 25 months. By applying the digital twin, the piling sequence of MJS piles and triaxial mixing piles was optimized and the excavation of foundation pit was optimized from the "split-trench type" to the "block type", saving a total of 7.6 months and increasing the efficiency by 30% improvement.

This is a project of college student innovation and entrepreneurship competition. With the help of our supervisor (Zhang Dongfang, Chang'an University), we carried out a non-linear finite element analysis of the seismic behaviour of the connection between concrete-filled steel tubes column and steel beam. The simulation results were compared with the theoretical solution and experimental results, and were in good agreement.