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Wang X.,BGI Engineering Consultants LTD. | Han X.,BGI Engineering Consultants LTD. | Zhou H.,BGI Engineering Consultants LTD. | Lei C.,Beijing MRT Construction Administration Corporation
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015

Environmental vibration responses induced by metro shield tunneling need to be predicted for evaluating these vibration impacts on the surrounding area. Metro shield tunneling for Beijing subway line NO.8 was studied. Analyses (the grey relation entropy method and the multiple regression analysis method) on field monitoring at the working face of the shield construction site suggests that the main factors controlling the shield construction vibration source are the stratum condition and its quantization characteristic parameter (the weighted dynamic elastic modulus of tunnel face stratum), and the cutter head torque and the gross propulsion. Furthermore, by studying field tests of the environmental vibration responses induced by metro shield construction, considering the distance attenuation regularities and the damping attenuation characteristics of the vibration propagation process in the surrounding stratum, a practical calculation method to predict the environmental vibration responses is found, and was approved by comparing predicted data against corresponding field recorded ones. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved. Source


Luo F.,Beijing Jiaotong University | Luo F.,Beijing MRT Construction Administration Corporation | Liu C.,BGI Engineering Consultants LTD. | Han X.,BGI Engineering Consultants LTD.
Zhongguo Tiedao Kexue/China Railway Science | Year: 2011

Based on the analysis of the rising groundwater level in Beijing area, FLAC numerical simulation method was adopted to analyze a given case of the metro tunnel, in which the depth and diameter was 6 and 10 m respectively. The variation trends and the distribution laws of the displacement, deformation, internal force (moment and axial force) and plastic zone of tunnel structure, etc. during the rising of groundwater level step by step, were studied. Analysis results show that there is little possibility that the tunnel is overall floating and the whole structure is destroyed as the groundwater level is rising remarkably. But the rising groundwater level will change the internal force (moment and axial force) of the tunnel structure and the deformation may occur, which will have definite impact on the metro structure. These changes can even make the structure crack, seep, and cause a series of problems. Thus, importance should be attached to the change of groundwater level in the planning, design and the construction of metro and underground structure. Source


Song Z.,Beijing MRT Construction Administration Corporation | Song Z.,Beijing Jiaotong University | Fang S.,Beijing MRT Construction Administration Corporation | Zhang Y.,Beijing Jiaotong University | Xie J.,Beijing Jiaotong University
Engineering Failure Analysis | Year: 2013

After two year service, cracks are frequently found at the under surface of the bolster cover plate which seriously affect the reliability of the freight wagon. The stress state of bolster cover plate should be analyzed on the basis of preliminary analysis, residual stress test, static stress test and dynamic stress test. The scope of this paper is to study the causes and characteristics of the cracks, which performed by fracture mechanics analysis and FEM analysis as well as stress tests. The research results have then been used for predicting the crack initiation life and propagation life. © 2012 Elsevier Ltd. Source


Wang F.,BGI Engineering Consultants LTD. | Huan X.,BGI Engineering Consultants LTD. | Lei C.,Beijing MRT Construction Administration Corporation | Zhou H.,BGI Engineering Consultants LTD. | And 2 more authors.
Modern Tunnelling Technology | Year: 2014

On the basis of current environment risk assessment method in Beijing, a new risk assessment procedure is presented for the long-distance shield tunnel passing beneath old one-storey houses. Based on current research results, a criterion of deformation control of old one-storey houses caused by shield driving is determined by using minimum curvature radius as a deformation control index. As for the shield tunnel of Beijing Metro Line 8, the risks in terms of the long-distance shield tunnel passing beneath old one-storey houses are assessed before commencement of works to verify its applicability and reliability of the proposed method. ©, 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved. Source

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