Hunan Provincial Communication Planning Survey and Design Institute

Changsha, China

Hunan Provincial Communication Planning Survey and Design Institute

Changsha, China
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Li Y.,Hunan University | Chen J.,Hunan University | Han X.,Hunan University | Huang K.,Hunan Provincial Communication Planning Survey and Design Institute | Peng J.,Hunan Provincial Communication Planning Survey and Design Institute
Physica B: Condensed Matter | Year: 2012

Phononic band structure with periodic elliptic inclusions for the square lattice is investigated based on the plane wave expansion method. The numerical results show the systems composed of tungsten (W) elliptic rods embedded in a silicon (Si) matrix can exhibit a larger complete band gap than the conventional circular phononic crystal (PC) slabs. The phononic band structure of the plate-mode waves and the width of the first complete band gap can be tuned by varying the ratio of the minor axis and the major axis, the orientation angle of the elliptic rods and the thickness of the PC slabs. We also study the band structure of plate-mode waves propagating in two-dimensional (2D) slabs with periodic elliptic inclusions coated on uniform substrate. © 2012 Elsevier B.V. All rights reserved.


Huang K.,Central South University | Huang K.,Hunan Provincial Communication Planning Survey and Design Institute | Peng J.-G.,Hunan Provincial Communication Planning Survey and Design Institute | Liu B.-C.,Central South University | And 3 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2011

To understand initial rock stress field and secondary rock stress field due to excavation in Xuefengshan tunnel, finite element software was used to establish numerical model to simulate the valley incision and tunneling process. In order to verify the reliability of the numerical model, comparison of stress numerical values and monitoring values in field tests was conducted, and the stress boundary was done. The results show that the model is reliable because numerical simulation stress is close to that of the field test. The spread of stress can be divided into two bands, i.e., the equable stress band and the effected band of epigentic-surface reformation. Around fracture in the equable stress band, there are stress varied phenomena and local high stress bands in the effected band, especially at the position of apparent landform chance. Stress concentration is serious around the tunnel. With the increase of the distance from the tunnel, the maximum principal stress decreases rapidly. Tensile stress does not appear around the tunnel, and the excavation influence band is from 0 to 1 times of the hole diameter.


Huang K.,Central South University | Huang K.,Hunan Provincial Communication Planning Survey and Design Institute | Liu B.-C.,Central South University | Peng J.-G.,Hunan Provincial Communication Planning Survey and Design Institute | And 3 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2011

The learning samples and test samples were built based on orthogonal experimental design and FLAC3D numerical simulation, using the project site for the surrounding rock displacement information. The potential mapping between parameters and surrounding rock displacement was established using neural network. The results show that the optimal solution of inversion parameters can be derived to achieve the displacement back analysis combined with the genetic algorithm and prediction function of the nerve network. Then inversion results can be the feedback for the design of tunnel support structure to achieve the tunnel construction and design of information technology.


Huang K.,Central South University | Huang K.,Hunan Provincial Communication Planning Survey and Design Institute | Ding G.-H.,Hunan Provincial Communication Planning Survey and Design Institute | Peng L.-M.,Central South University | And 3 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2011

The causes of the problem such as collapse encountered during Liuyanghe tunnel construction in the weathered slot were analyzed. Based on geology condition, the original design was modified and some countermeasures were put forward, such as reinforcement geology forecast and preliminary support, setting vertical temporary steel support. Construction safety was adjusted using simulation software and in-site monitoring. The tunnel stability was analyzed by strength reduction method. The results show that vertical steel support can effectively reduce crown displacement. Tunnel safety factor is 1.8 based on strength reduce method, and the main indicators of rock failure is crown displacement. The research can give a reference for similar tunnel projects.


Zhao J.-P.,Central South University | Xu G.-Y.,South China University of Technology | Huang K.,Hunan Provincial Communication Planning Survey and Design Institute | Huang K.,Central South University
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2011

Dynamic strain signals of blast wave action and damage variable D distribution were tested in the range of 8-16 cm from central blast when air decoupling charge coefficient K is 2.0, 2.5, 3.0 and 3.5, and blast waves were recognized and divided into three subareas, i. e., shock wave area, stress wave area and detonation gas action area. The relationships among the peak value stress σ max, the peak value strain rate ε max and the peak value particle velocity umax of every zone with K and the distance R from borehole to measuring point were studied. The results show that σ max, σ max and ε max umax of the shock wave are 752-1720 MPa, (4.85-10.00)×10 4/s and 95.9-184.0 m/s, respectively. The lasting time of the shock wave is about 3μs and σ max, σ max and ε max decrease with the increase of K and R. The stress of stress wave shows the form of tensile and compressive stress and the lasting time is 2.6-3.8μs, σ max ε max and u max of stress wave vary complicatedly with K and R and increase notably in the damage border. The detonation gas shows the form of lasting tensile stress or compressive stress and also increases notably in the damage border. The lasting time is about 17μs, ε and u are approximately 0.σ max varies with the increase of K whose magnitude is very small.


An Y.-L.,Hunan University of Science and Technology | Huang K.,Hunan Provincial Communication Planning Survey and Design Institute | Huang K.,Central South University | Peng L.-M.,Central South University | Lei M.-F.,Central South University
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2012

Man-machine engineering theory was applied to comprehensively evaluate tunnel construction risk. Definition of man sub-system, machine sub-system and environment sub-system was discussed separately, and an open assessment factor system was established based on related norms, expert method and tunnel construction technology. The assessment flow chart is as follows. Experts weight was first qualified considering factors such as academic background, professional title and working time. Index layer risk was then determined by expert method, and its factor weight was calculated by entropy measurement. Rule layer weight was determined using expert method and AHP, then risk assessment in different layer was made. From the man-machine-environment view, the model was used to evaluate a tunnel risk. The results show the model is reasonable, and some prevention measures are also proposed according to assessment results.


Zhang K.,Central South University | Cao P.,Central South University | Liu Z.-Y.,Central South University | Hu H.-H.,Hunan Provincial Communication Planning Survey and Design Institute | Gong D.-P.,Hunan Provincial Communication Planning Survey and Design Institute
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2011

The failure mechanism of two-dimensional (2D) and three-dimensional (3D) slopes were investigated by using the strength reduction method. An extensive study of 3D effect was conducted with respect to boundary conditions, shear strength and concentrated surcharge load. The results obtained by 2D and 3D analyses were compared and the applicable scope of 2D and 3D method was analyzed. The results of the numerical simulation show that 3D effect is sensitive to the width of slip surface. As for slopes with specific geometry, 3D effect is influenced by dimensionless parameter c/(γHtanø). For those infinite slopes with local loading, external load has the major impact on failure mode. For those slopes with local loading and geometric constraints, the failure mode is influenced by both factors. With the increase of loading length, boundary condition exerts a more significant impact on the failure mode, and then 2D and 3D stability charts are developed, which provides a rapid and reliable way to calculate 2D and 3D factor of safety without iteration. Finally, a simple and practical calculation procedure based on the study of 3D effect and stability charts is proposed to recognize the right time to apply 2D or 3D method. © 2011 The Nonferrous Metals Society of China.

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