Beijing Major Projects Construction Headquarters Office

Beijing, China

Beijing Major Projects Construction Headquarters Office

Beijing, China
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Zhao J.,Beijing Jiaotong University | Zhao J.,Beijing Municipal Engineering Research Institute | Niu X.,Beijing Jiaotong University | Niu X.,Beijing Municipal Engineering Research Institute | And 3 more authors.
Modern Tunnelling Technology | Year: 2016

This paper proves that the application of a numerical simulation method is reliable for studying the influence of tunnel excavation on an adjacent pile group by comparision of the two-phase method and numerical simulation method. Based on the Mohr-Coulomb elastic-plastic yield criterion, a three-dimensional numerical model was established with the finite difference numerical analysis software to study the variation law of the shielding effect of a pile group under different stress release rates, pile spacings and pile lengths. The analysis results show that the stress release caused by tunnelling has little influence on the shielding effect; the curves of the pile group shielding effect coefficient decrease with the increase of pile spacing except for the pile settlement; the influence of pile length difference on the shielding effect is more complicated, because the variation of various indexes does not exhibits the same law with changing of the pile length. © 2016, Editorial Office of "Modern Tunnelling Technology". All right reserved.


Li D.,Beijing Jiaotong University | Li D.,Beijing Municipal Engineering Research Institute | Wang M.,Beijing Jiaotong University | Yang G.,Beijing Major Projects Construction Headquarters Office | And 2 more authors.
Modern Tunnelling Technology | Year: 2014

Since the excavation of a large and deep foundation pit is adjacent to metro Line 4 under operation, it is necessary to control strictly the deformation of existing metro tunnel during the excavation of the foundation pit. Three-row cast-in-place concrete piles are designed at one side of existing metro to make support. Deformation of existing metro tunnel is predicted and analyzed by numerical simulation. Site monitoring of three-row piles and existing metro tunnel is conducted during excavation of foundation pit. Through the analysis of monitoring data collected from each row of pile and existing metro tunnel, it is verified that three-row piles has a significant effect on protecting the adjacent metro tunnel and controlling its deformation. In addition this paper summarizes the deformation law and related influential factors, providing reference for similar projects in the future. ©, 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved.


Li D.-H.,Beijing Jiaotong University | Li D.-H.,Beijing Municipal Engineering Research Institute | Wang M.-S.,Beijing Jiaotong University | Yang G.-W.,Beijing major Projects Construction Headquarters Office | And 2 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014

The existing buildings adjacent to a deep foundation pit will be damaged seriously or additionally deformed when the foundation pit is excavated, and it will lead to motion of soils. The double-row piles as one of shielding measures are studied. Based on a deep foundation pit adjacent to high buildings in Beijing, the key design parameters of double-row piles such as distance of row piles, distance of piles, link of top beam, and strength of soils between the piles are analyzed. Through the numerical simulation and in-situ monitoring, the displacement field grouped by the double-row piles, soils after the piles and high buildings is analyzed. The deformation laws of the double-row piles, soils after the piles and high buildings are concluded. At the same time, it is proved that the double-row piles can reduce the displacement field obviously by comparing the double-row piles to the single-row ones. The horizontal displacement of soils after the piles decreases from 17 mm to 8 mm, with a percent of about 53%. The maximum differential settlement of high buildings is 6.9 mm and the angle variance is 0.33‰. In a word, the safety of buildings is ensured by monitoring during the excavation of the deep foundation pit. It may be useful reference to the similar engineering in future.


Liu J.,Beijing University of Civil Engineering and Architecture | Zhou H.,Beijing University of Civil Engineering and Architecture | Yuan H.J.,Beijing Urban Rapid Transit Company | Li J.F.,Beijing Major Projects Construction Headquarters Office
Advanced Materials Research | Year: 2014

Subway stations or shield wells are often built using steel reinforced concrete supporting structure materials. These concrete retaining structure materials must be destroyed before launching and receiving of shield, so, some security risks may arise during destroying, and time limit for project may be longer, and the structure strength may be weakened; there are the same problems in crossing the existing subsidiary structure. In the supporting structure, concrete supporting structure materials have been partially substituted by GFRP bars in shield engineering in the world. In order to study the mechanical properties of GFRP bars deeply, experimental research on strength of GFRP bars have been made, and some relation shapes between stress and shear strength have been discussed; all of these are expected to make some basis for the design of GFRP concrete in shield engineering. © (2014) Trans Tech Publications, Switzerland.


Li D.,Beijing Jiaotong University | Li D.,Beijing Municipal Engineering Research Institute | Liu J.,Beijing University of Civil Engineering and Architecture | Wang M.,Beijing Jiaotong University | And 3 more authors.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015

As an important construction link of shield tunnel, shield-driven maybe lead to risk. Particularly as a new construction technology, it is so necessary to adequately research the design parameters of enclosure structure cut by shield machine directly. Based on subway engineering, the deformation of enclosure structure composed of GFRP pile is researched. By numerical analysis and monitoring in-site, the deformation of GFRP pile and ground settlement in the process of excavation of deep shield-driven pit is analyzed. The variation characteristics of deformation of GFRP pile and ground settlement are concluded. By the comparative analysis, the horizontal displacement of GFRP pile is more than that of reinforced concrete pile. The GFRP pile meet the requirement of excavation safely and cutting directly. In a word, GFRP piles are applied in shield-driven pit successfully. It may be useful for similar engineering in future. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved.


Yang G.,Beijing Major Projects Construction Headquarters Office | Peng H.,Beijing Jiaotong University | Wang J.,Beijing Major Projects Construction Headquarters Office | Cai X.,Beijing Jiaotong University
Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University | Year: 2013

To remediate abnormal rail corrugation of Beijing subway, it is the first time that the causes and treatment measures of abnormal rail corrugation have been studied from the perspective of track stiffness based on engineering analogy. The article takes Beijing subway line 4 having abnormal rail corrugation as the research object and makes it compare with Beijing subway line 1 and line 2 having no abnormal rail corrugation. We select representative curve as test sections and test track's vertical stiffness and lateral stiffness. The analyses show the following conclusions. Low track's lateral stiffness is direct cause of abnormal rail corrugation and track's vertical stiffness have little effect on abnormal rail corrugation. It is useful to avoid abnormal rail corrugation by increasing properly track's lateral stiffness so that track's vertical and lateral stiffness ratio is less than 3. Field investigations show that abnormal rail corrugation is well controlled after increasing track's lateral stiffness.


Yang G.W.,Beijing Major Projects Construction Headquarters Office | Peng H.,Beijing Jiaotong University | Wang J.N.,Beijing Major Projects Construction Headquarters Office | Cai X.P.,Beijing Jiaotong University
Applied Mechanics and Materials | Year: 2013

To solve the abnormal rail corrugation problem of Beijing Metro Line 4, the track structural parameters comparative tests were carry out in the Metro Line 1,2 and 4. Metro Lines 1 and 2 were chosen based of the Beijing Subway Survey and previous successful experiments. The comparative analysis was based off of rail static geometry, dynamic displacement and the lateral acceleration. The test results proved the stiffness of line4 is weaker than line1,2 and suggestions on steps to prevent and correct the metro rail's abnormal corrugation will be formulated. © (2013) Trans Tech Publications, Switzerland.

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