China Railway Construction & Investment Group Co.

Shenzhen, China

China Railway Construction & Investment Group Co.

Shenzhen, China
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Li Y.,China University of Mining and Technology | Yang F.,China University of Mining and Technology | Liu J.,China Railway Construction & Investment Group Co. | Peng H.,Chongqing Rail Transit Design and Research Institute
Modern Tunnelling Technology | Year: 2017

Efficient monitoring information management plays an important role in risk control during subway construction. Based on the SuperMap Objects of a domestic GIS component, a monitoring information management system for subway construction safety, which features an electronic map, a data set implying engineering information and an expression of mileage information, was developed with the Beijing underground transit line used as a background. This system integrates electronic mapping, editing and remote real-time monitoring; gives a general framework and rapid construction method and process of information management system for the safety monitoring of underground works; and has been promoted and applied in metro and highway tunnel projects in Beijing, Tianjin and Shenzhen. Practice shows that this SuperMap Objects based safety monitoring information management system has great practical value and good application prospects. © 2017, Editorial Office of "Modern Tunnelling Technology". All right reserved.


Lin Z.,China University of Mining and Technology | Li Y.,China University of Mining and Technology | Liu J.,China Railway Construction & Investment Group Co.
Modern Tunnelling Technology | Year: 2016

The geotechnical hazards caused by the excavation of foundation pits in soft soil are becoming increasingly prominent. In order to obtain the spatial-temporal evolution regularity of foundation pit deformation caused by excavation in soft soil, a 3D numerical model that takes into account the influence of silt layer creep properties and the concrete brace strength changes over time was built using FLAC3D for the Qianhaiwan Station foundation pit of Shenzhen Metro Line 11. Through modelling simulations, this paper studies and analyzes the spatial-temporal evolution regularity of the support structure deformation of a foundation pit, as well as the surface settlement and internal force of the support as it changes with excavation. The results show that: 1) the maximum displacement position of the foundation pit pile will move downward with excavation, and the pile displacement pattern will change from a "forward-shaped" one to a "bow-shaped" one; 2) the maximum pile displacement approximately exhibits a tendency of exponential decay with the passing of excavation time; 3) surface subsidences on both sides of the foundation pit present a "groove-shaped" form along the transversal direction with maximum settlement occuring 6.5 m away from the margin of the foundation pit, and this settlement value has a linear relationship with the excavation time. © 2016, Editorial Office of "Modern Tunnelling Technology". All right reserved.

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