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Li Z.,Beijing Jiaotong University | Yan M.,Tianjin Municipal Engineering Design and Research Institute | Wang T.,Beijing Municipal Engineering Group Co. | Zheng H.,Beijing Municipal Engineering Group Co.
Modern Tunnelling Technology | Year: 2015

As the external environment and its surroundings of metro engineering has been becoming more complicated, the conventional metro construction schemes are confronted with high challenges and great risks. In this paper, taking Beijing metro line 14 as an engineering practice, the construction scheme of large-diameter shield for metro engineering is presented: e.g. the single-tube double-track running tunnel and metro station section are successively driven by the large-diameter shield machine (φ10.2 m), and then the metro station is enlarged by mined method. Besides, the other issues are discussed in detail, including the shield tunnel structure type, shield tunnel construction scheme, enlarged metro station construction scheme, design option of key structural parts and key enlarged excavation technologies. The engineering practice shows that structure risks and environment risks are effectively controlled during metro construction. Using the proposed new construction method it can solve construction problems of metro engineering under urban complex conditions and also the conflict between shield tunnel construction and station construction. © 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved.

He M.,Beijing Jiaotong University | He M.,Beijing Municipal Engineering Research Institute | Liu J.,Beijing Municipal Engineering Group Co. | Le G.,Beijing MTR Construction Administration Co. | And 2 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2010

Based on a certain constructing running shield tunnel of Beijing metro side-crossing close to a high-rise building, using the finite element method calculation model and site monitoring method, the foundation characteristics of the high-rise building affected by the constructing shield tunnel are studied. In different construction stages, the variations of the foundation settlement and inclination of the high building are analyzed. The simulation results show that stratum vertical displacement has a sudden change near the high-rise building. Away from the building in an enough distance, the displacement curve becomes flat. From site monitoring results, the high-rise building inclined to the direction away from the tunnel prior to the shield closing to the building, while the building inclined towards the tunnel during shield crossing. The settlements of the monitoring points reach the maximum value when the shield is 10.0 m away from the monitoring surface. However, the settlements declined significantly when the shield is more than 60.0 m from the monitoring surface, and finally becomes stable. The simulation and the site monitoring results agree well. The conclusion would be helpful for the future similar shield tunneling projects.

Wang F.,Beijing Jiaotong University | He S.,Beijing Jiaotong University | Wang T.,Beijing Municipal Engineering Group Co. | Liu J.,Beijing University of Civil Engineering and Architecture | Cao R.,Beijing Jiaotong University
Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University | Year: 2013

The experiment section of Beijing metro line 14 is constructed by earth pressure balance shield machine, and the shield tunnel will be enlarged by Pile-Beam-Arch method (PBA method) to form the metro station. This method can effectively and safely solve the contradiction between the construction of metro station and shield tunnel, but there is not similar engineer. The empirical formulas of predicting the ground surface settlement, the related statistics data and specifications, and numerical simulation methods are used to predict the ground surface settlement caused by the large diameter shield tunnel enlarged by PBA method in construction process. Combined with the ground surface settlement control reference values of Beijing metro station and the statistic data of existing metro station statistics, the ground settlement control standard is put forward. In accordance with the three class control management methods, the ground surface settlement is controlled step by step. The research results have some reference value to guide the engineering construction.

Li Z.,Beijing Jiaotong University | Wang T.,Beijing Municipal Engineering Group Co. | Zheng H.,Beijing Jiaotong University
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2015

The Jiangtai station of Beijing metro line 14 was built by enlarging the large diameter shield tunnel with the mining method. The key construction stage was analyzed in detail by using three-dimensional finite element simulations with emphasis on the effects of the asymmetric pilot tunnel excavation and the asymmetric dismantling of the K shield segments. The results showed that the stress distribution in the primary lining structure, the segment and the middle partition wall appeared asymmetric. The stresses in the segments were turned from compressive into tensile and the stress in the primary lining reached its maximum value after one side of the K segment was dismantled. When the pilot tunnel was excavated, the stress in the middle partition wall was under uneven pressure after one side of the pilot tunnel was excavated. The compression stress in the middle partition wall reached the maximum after both side of K segments were dismantled. On the basis of the numerical simulation results and the onsite monitoring data for the middle partition wall, the supporting parameters of the middle pilot tunnel, the excavation method of the middle pilot tunnel and the method of K segment dismantling were optimized to ensure the safety of the enlarging excavation and the metro station structure. ©, 2015, Academia Sinica. All right reserved.

Li H.,Beijing University of Technology | Yang Y.,Beijing University of Technology | Tu X.,Beijing University of Technology | Wang T.,Beijing Municipal Engineering Group Co.
Przeglad Elektrotechniczny | Year: 2012

For the electrical control system of push pipe driving machine, the adjustment of jacking force is critical to balancing the resistance force and moving the pipe string forward. This force should be well under control so as to avoid both the collapse (active failure) and the blow-out (passive failure) of the soil mass near the tunnel face. The aim of this paper is to determine the collapse and blow-out face jacking force of a rectangular tunnel. The analysis is carried out in the framework of the kinematic method of limit analysis theory. The numerical results obtained are presented and analyzed.

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