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Kong X.,China Communications Construction Company Ltd.
Proceedings - 2016 9th International Symposium on Computational Intelligence and Design, ISCID 2016 | Year: 2017

During settlement, many methods will provide valuable information. When different methods combined properly, valuable information is variously used. Based on the principle of artificial intelligence and method of fuzzy mathematics, the fuzzy combination forecasting method of self-adaptively variable weight is proposed. According to matching degree, the weights can be revised, and then forecasting results can be accurate. The fuzzy combination forecasting method is used to the subgrade settlement in Changzhang expressway, which can provide the accuracy and applicability. © 2016 IEEE.


Kong X.,China Communications Construction Company Ltd.
Proceedings - 2016 9th International Symposium on Computational Intelligence and Design, ISCID 2016 | Year: 2017

In recent years, the theory and method of wavelet analysis is widely used in signal processing, pattern recognition, data compression, image processing and quantum physics. Compared with modulus maxima, wavelet packet decomposition and coefficient shrinkage de-noising method of wavelet transform, their advantages and disadvantages are analysed and summarized, and their respective scopes are obtained. The Noissin chosen as the original signal with noise is analysed and de-noised by the modulus maxima method of wavelet transform, meanwhile the usage conditions and key computing parameters are also obtained. Finally, the modulus maxima method of wavelet transform are successfully adopted to de-noised the monitoring results of shield tunnel, the data revised are reliably provided for tunnel healthy diagnosis. © 2016 IEEE.


Lin W.,China Communications Construction Company Ltd.
Modern Tunnelling Technology | Year: 2015

Since the construction of immersed tunnels involves numerous procedures such as prefabrication, floating, transportation, immersion and underwater connections, a series of temporary auxiliary facilities are required for their installation. Based on domestic and international findings regarding temporary auxiliary facilities for the installation of immersed tunnels and referencing the design and construction of the Hong Kong-Zhuhai-Macau Bridge (HZMB) Immersed Tunnel Project, this paper systematically divides the temporary auxiliary facilities into different types and analyzes their features and the items needed to meet element construction requirements. The research results show that temporary auxiliary facilities for the installation of immersed tunnels involve numerous complex systems and professions, and the final scheme should be determined by considering the actual demands of the project with classified problems, facility features, capacity and engineering factors. ©, 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved.


Yao Z.,China Communications Construction Company Ltd.
Modern Tunnelling Technology | Year: 2015

Because of the complexity and uncertainty of geological conditions, risk assessments for the construction safety of underwater shield tunnels have become an important research topic in underground engineering. Based on the Nanjing Weisan Road river-crossing tunnel construction, this paper analyzes the identification of construction risk factors and evaluation of construction risks in the shield-driven section and formulates control measures for the various risk factors. The analysis results show that hyperbaric intervention in the shield chamber is the primary goal of risk control for such shield tunnels as the Nanjing Weisan Road river-crossing tunnel, which passes through mixed ground with high water pressure and permeability for long distances. Risk may be reduced by reducing the changing times of cutters, setting a reasonable face support pressure and ensuring the formation of a stable filter cake on the working face. Risk during the process of shield tunnelling is mainly controlled by the detection of shield tunnelling parameters and cause analysis of parameter anomalies while the shield machine is shut down; complete risk control measures, such as a risk emergency plan and emergency supplies, are also important measures for reducing risks. ©, 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved.


Xu Z.,China Communications Construction Company Ltd. | Hu M.,China Communications Construction Company Ltd.
Modern Tunnelling Technology | Year: 2013

Aeolian sand features a loose structure as well as low cohesive force and shear strength, which means that it is apt to become loose and deformed under external force. This paper presents the deficiencies of conventional long pipe roof grouting reinforcement for tunneling in aeolian sand, including serious sand leakage, difficulty controlling the deformation at the tunnel face, and a long construction period. These deficiencies may be overcome by using a vertical jet grouting pile on the ground for surrounding rock reinforcement and a horizontal jet grouting pile in the tunnel for advanced support. Site monitoring and measurements show that crown settlement and peripheral convergence induced by long pipe roof grouting reinforcement are 6.5 times and 3.6 times that induced by jet grouting pile reinforcement respectively. Furthermore, the construction duration with the pipe roof scheme is 1.9 times longer than that with jet grouting.


Xia R.,China Communications Construction Company Ltd.
Modern Tunnelling Technology | Year: 2014

Using domestic and foreign experiences in non-ballasted track construction and related technical documents as references and the double-block non-ballasted track construction of tunnel groups on the Gui-Guang railway as a background, the equipment configuration and organization of logistics for non-ballasted track construction for tunnel groups in mountain areas were studied and the related procedures for construction in a double-track tunnel are proposed in this paper. Engineering practices indicate that in-situ assembly of the track panel using a combined track framework could be adapted to adjust to the curve radius of the track and guarantee the technical indexes of non-ballasted track construction, therefore having rapid construction conversion capability. With high precision and stiffness, the assembled track framework is recyclable to shorten the construction period and save construction costs.


Kong X.,China Communications Construction Company Ltd.
Geotechnical Special Publication | Year: 2016

For satisfying the requirements of normal running and enlarged outer section in stabling line, parallel neighborhood metro tunnel with two different inner sections is adopted in Xi'an Urban Rail Transit Line One between North Zaoyuan Road and Hancheng Road. Based on the characteristics of different inner sections and small clear spacing, 2D-FEM was applied to simulate and analyze four construction schemes, of which shield method was adopted in left tunnel with small inner section and double-heading construction method or cross diaphragm method for right tunnel with large inner section. The results show that compared with the construction scheme that the tunnel with small inner section is firstly excavated, the larger tunnel by double-heading constructed is first accomplished can evidently reduce the disturbance effect on surrounding rock, reach better state mechanical of tunnel lining, in order to ensure safety construction. © ASCE.


Kong X.,China Communications Construction Company Ltd.
Geotechnical Special Publication | Year: 2016

In recent years, the theory and method of wavelet analysis is widely used in signal processing, pattern recognition, data compression, image processing, and quantum physics. Compared with modulus maxima, wavelet packet decomposition and coefficient shrinkage de-noising method of wavelet transform, their advantages and disadvantages are analysed and summarized, and their respective scopes are obtained. The Noissin chosen as the original signal with noise is analysed and de-noised by the modulus maxima method of wavelet transform, meanwhile the usage conditions and key computing parameters are also obtained. Finally, the modulus maxima method of wavelet transform are successfully adopted to de-noised the monitoring results of shield tunnel, the data revised are reliably provided for tunnel healthy diagnosis. © ASCE.


Lv B.,China Communications Construction Company Ltd.
Modern Tunnelling Technology | Year: 2014

Considering the great strength and stability of medium weathered slate, the innovative arch-cover method was successfully adopted for the first time in construction of the large-span shallow-buried bored metro stations of the Dalian metro project. Based on the design and construction of the Zhongshan Square station, the core concept and advantages and disadvantages of the arch-cover method are compared with the PBA method in this paper. After completion of the primary support at the arch, the three different construction sequences of top-down, semi-top-down and semi-bottom-up, and bottom-up were analyzed and compared in detail from the aspects of safety, quality, progress, and additional measures. Results show that the top-down method was undoubtedly the most reliable when experience and relevant data are lacking. Countermeasures against construction problems, such as a large arch spring, arch support, medial plate, drill-blasting, and steel pipe column protection, as well as surrounding rock support for the high side wall, are put forward. Finally, the optimization suggestion of the arch-cover method is presented.


Fei X.,China Communications Construction Company Ltd.
Progress in Civil, Architectural and Hydraulic Engineering - Selected Papers of the 4th International Conference on Civil, Architectural and Hydraulic Engineering, ICCAHE 2015 | Year: 2016

Footbridges are inevitably subjected to environmental effects, such as wind, traffic induced vibration, human activities and temperature variations. The investigation on the dynamic characteristics of the footbridges is of much importance and is a direct and crucial approach to reflect the structural dynamics responses and assess the structural performance. To this end, a cable-stayed footbridge is taken as a real example to investigate properties of the natural frequency and the mode shapes through finite element analysis in this study. The deck, tower and cable are simulated by using the shell element, beam element and cable element, respectively. The mass matrix of the cable is the lumped mass matrix. The axial stiffness of the cable affected by the sag is modified based on the Ernst expression. The made observation indicate that the dynamic properties of the steel-concrete composite cable-stayed footbridge are different to those of the common long span cable-stayed bridge. © 2016 Taylor & Francis Group, London.

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