Chongqing Rail Transit Design and Research Institute

Chongqing, China

Chongqing Rail Transit Design and Research Institute

Chongqing, 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.


Zhao X.,Chongqing University | Zhao X.,Chongqing Rail Transit Design and Research Institute
Journal of Information and Computational Science | Year: 2014

Based on digital image feature of granite and sandstone, the spectrum diagram of several ingredients in rock is established by using wavelet theory and Bayes theory. Firstly, the sample set and distribution domain are obtained by rock image gray statistical function, whose minima have been optimized by iterative algorithm. Secondly, the establishment of each rock component bands, which are wavelet decomposition coefficient matrices that has been homogenized, is done in according to pyramid principles. Finally, only if the coordination set of all levels wavelet decomposition coefficients and corresponding point set is done which is based on the formerly gained sample set, the spectrum diagram of each component containing in granite and sandstone are finally set up with Bayes theory. The application of wavelet to rock components recognition and classification is based on priori theory, that is to say, once the spectrum of each known rock component are established with the method discussed in this paper that is easy to confirm the rock components and their distribution in other unknown rock image. ©, 2014, Binary Information Press.


Qi Y.,Beijing Jiaotong University | Liu B.,Beijing Jiaotong University | Ma Q.,Chongqing Rail Transit Design and Research Institute
Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University | Year: 2014

The construction of inclined shaft by shield method in New Street Mine is the first time adopted in the domestic. In order to ensure the stability of the inclined shaft after it puts into operation, six sections are selected in different positions along the inclined shaft axis. Analysis of how coal mining affects the stability of shield inclined shaft with segment structure under different coal pillar widths using displacement angle of strata theory and discrete element simulation is used to determine the width of protective coal pillar. As a result, with the height from bottom plate of inclined shaft to the coal seam increasing, the width of protection coal pillar increases. The results were compared with the actual results, and the laws of the two are in good agreement.


Liu B.,Beijing Jiaotong University | Shen M.,Beijing Jiaotong University | Ma Q.,Chongqing Rail Transit Design and Research Institute
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2014

The construction of highway mountain tunnel is affected by various uncertain factors with random and fuzzy characteristic, which cannot be exactly analyzed by current risk assessment method. This paper proposes the fuzzy-analytic network process(F-ANP) which is composed by Delphi method, analytic network process and fuzzy comprehensive evaluation. Based on the analysis of the whole process in the construction of the highway mountain tunnel, a synthetic evaluation index system for the construction of highway mountain tunnel is established. A fuzzy relation matrix is established by evaluating the evaluation index with expert investigation, by using Delphi method to compare and using triangular fuzzy number to represent the judgment matrix, a fuzzy super matrix is established with the analytic network process, by evaluating its limit matrix can obtain the comprehensive weight, then obtain the level of construction risk. Finally, empirical research to Longtouling tunnel shows that the method is reasonable and practical, it can provide reference to risk analysis for future similar projects, ensure construction safety and reduce potential losses.


Zhao X.,Chongqing University | Zhao X.,Chongqing Rail Transit Design and Research Institute | Ye J.,Chongqing University
Electronic Journal of Geotechnical Engineering | Year: 2014

As a new technology in deep foundation pit, double-row piles are widely used when the excavation depth exceeds 10m. However, there is rare literature specifically for the design of double-row retaining piles without coupling beams. Considering the hydrologic and engineering geological conditions, it is difficult to calculate theoretically accurately structural deformation of the foundation pit. In order to explore the behaviors of cantilever double-row retaining piles in the process of excavation, a numerical simulation was carried out. The ground overload was considered. The results show that: (1) The lateral displacements and bending moments of the double-row piles will increase significantly underground overload, which should not be neglected in the design of double-row piles. (2) The maximum lateral displacements of the leading and rear piles are both located at the pile head. It is suggested to use cantilever double-row piles unless the retaining structure could not resist the tremendous soil pressure. (3) The lateral displacements and bending moments of the rear and leading piles will increase as the excavation depth grows. When the excavation depth reaches the bottom of foundation pit, the maximum later displacement and bending moment could be found. (4) The maximum bending moment of the leading and rear piles are both located at the depth a little below bottom of the foundation pit. © EGJE, 2014.


Zhao X.-B.,Chongqing University | Zhao X.-B.,Chongqing Rail Transit Design and Research Institute | Ye J.-B.,Chongqing University
Electronic Journal of Geotechnical Engineering | Year: 2014

The use of double-row retaining piles in deep foundation pit is attracting more and more attentions. However, the pile-soil interaction is complex and reports about field measurement of double-row retaining piles are scare. There is a greatly varying distribution of earth pressure between the front-row pile and the back-row pile in the deep foundation pit, which leads to deviation between practice and theory. Based on the field test and numerical simulation, the behavior of double-row retaining piles is analyzed. The displacement of the retaining structure with double-row piles measured in the field test are compared with those of FLAC3D. The calculated results are in good agreement with the field test. The following conclusions have been drawn: (1) The lateral displacements of the leading pile is similar to that of the rear pile, which reveals that the double-row pile work together effectively. However, the displacement of the leading pile is slight larger than that of the rear pile. (2) The maximum lateral displacements of the leading and rear piles are both located at the the pile head. The pile head displacements of the double-row piles increase as the excavation proceeds. The maximum deflection of pile head could be found when the excavation depth reaches 10m. It is suggested to use cantilever double-row piles when the excavation depth doesn't exceed 10m. (3) The surface settlement behind the pile will increase as the excavation depth grows. When the excavation depth reaches the bottom of foundation pit, the maximum surface settlement could be found. © EGJE, 2014.


Zhao X.,Chongqing University | Zhao X.,Chongqing Rail Transit Design and Research Institute | Wang G.,Chongqing University | Wu X.,China Coal Research Institute | Zhou J.,University of Bristol
Journal of Engineering Science and Technology Review | Year: 2015

The accuracy of the bottom curve of a PC track beam is strongly related to the production quality of the entire beam. Many factors may affect the parameters of the bottom curve, such as the superelevation of the curve and the deformation of a PC track beam. At present, no effective method has been developed to determine the bottom curve of a PC track beam; therefore, a new technique is presented in this paper to deduce the parameters of such a curve and to control the accuracy of the computation results. First, the domain of the bottom curve of a PC track beam is assumed to be a spindle plane. Then, the corresponding supposed top curve domain is determined based on a geometrical relationship that is the opposite of that identified by the conventional method. Second, several optimal points are selected from the supposed top curve domain according to the dichotomy algorithm; the supposed top curve is thus generated by connecting these points. Finally, one rigorous criterion is established in the fractal dimension to assess the accuracy of the assumed top curve deduced in the previous step. If this supposed curve coincides completely with the known top curve, then the assumed bottom curve corresponding to the assumed top curve is considered to be the real bottom curve. This technique of determining the bottom curve of a PC track beam is thus proven to be efficient and accurate. © 2015 Kavala Institute of Technology.


Huang Y.-Y.,Wuhan Naval University of Engineering | Gao H.-P.,Wuhan Naval University of Engineering | Wang Z.-Y.,Chongqing Rail Transit Design and Research Institute
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2010

With the instruction of computational dynamics of multi-body system, considering coupling factor between the subassemblies of mechanism, the whole diesel system consisting of the rigid-flexible bodies model of moving mechanism and the model of crankshaft torsional vibration was estabilished. The integral model was proved by the vibration intensity experiment and the speed fluctuation experiment of the diesel. Based on these, the dynamic strength of the diesel was analysed by using the multi-body system dynamics and then verified with the finite element method. The results show that the method is correct and credible. Then the coupled vibration of crankshaft was analysed by using the model of crankshaft torsional vibration. The whole analysis process provides a simple and feasible approach to check the strength of the diesel moving mechanism to optimize structure, and to implement fault analysis.

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