A Theoretical Calculation Method of Influence Radius of Settlement Based on the Slices Method in Tunnel Construction

Tian, Xiaoxu; Song, Zhanping; Wang, Bing; Zhou, Guannan

doi:10.1155/2020/5804823

Cited by 11 publications

(6 citation statements)

References 30 publications

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“…Compared with other feature angular points, the conclusion can be verified [ 30 ]. Combining the edge points of all image edges, the distance between the edge angle and the fitted line extracted by the proposed image fusion algorithm, the algorithm based on the spatial and spectral constraint, and the algorithm based on block directional wavelet transform is 0.18–1.51 μ m, 2.95–7.55 μ m, and 3.31–5.11 μ m, respectively [ 31 , 32 ]. According to the above data, the edge detection and fitting effect of the proposed algorithm are better, and the location accuracy of edge feature angular is higher.…”

Section: Discussionmentioning

confidence: 99%

Image Fusion Algorithm at Pixel Level Based on Edge Detection

Chen

Shabaz

2021

Journal of Healthcare Engineering

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In the present scenario, image fusion is utilized at a large level for various applications. But, the techniques and algorithms are cumbersome and time-consuming. So, aiming at the problems of low efficiency, long running time, missing image detail information, and poor image fusion, the image fusion algorithm at pixel level based on edge detection is proposed. The improved ROEWA (Ratio of Exponentially Weighted Averages) operator is used to detect the edge of the image. The variable precision fitting algorithm and edge curvature change are used to extract the feature line of the image edge and edge angle point of the feature to improve the stability of image fusion. According to the information and characteristics of the high-frequency region and low-frequency region, different image fusion rules are set. To cope with the high-frequency area, the local energy weighted fusion approach based on edge information is utilized. The low-frequency region is processed by merging the region energy with the weighting factor, and the fusion results of the high findings demonstrate that the image fusion technique presented in this work increases the resolution by 1.23 and 1.01, respectively, when compared to the two standard approaches. When compared to the two standard approaches, the experimental results show that the proposed algorithm can effectively reduce the lack of image information. The sharpness and information entropy of the fused image are higher than the experimental comparison method, and the running time is shorter and has better robustness.

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Section: Discussionmentioning

confidence: 99%

Image Fusion Algorithm at Pixel Level Based on Edge Detection

Chen

Shabaz

2021

Journal of Healthcare Engineering

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“…Due to the decrease of local pressure caused by the mainstream below the jet, a part of gas of the hairpin vortex replenished downward, the mainstream is absorbed again and the second hairpin vortex continues to rise. Therefore, in the process of downstream flow, the coolant flow continuously entrains the main flow and mixes it to form hairpin vortexes [20,[32][33][34][35][36][37][38][39][40] .…”

Section: Evolution Process Of Coolant Outflow and Cooling Efficiency mentioning

confidence: 99%

The Heat Transfer Characteristics in Stepped Hole of Traditional Metal Materials Induced by Stepped Film Holes

Libing¹,

Zhang²,

Li³

et al. 2020

Rev. Chim.

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With the increase of temperature requirement, the application of metal matrix materials is gradually reduced due to its poor temperature resistance. In order to improve the application of traditional metal based materials, new cooling technology must be developed to meet the application of metal based materials. In this paper, the cooling flow field of cylindrical hole and two kinds of stepped film holes based on metal materials is simulated by large eddy method(LES), the development of vortex structure and flow characteristics in the mixing area of coolant flow and mainstream are analyzed and studied. The distribution is strongly effected by stronger thermal convection compared with the new temperature resistant material. The results show that four kinds of vortices form downstream the film hole, namely, horseshoes vortex, shear layer vortex, hairpin vortex and the counter rotate vortex pair (CVP). The CVRP formed on the stepped plane which strongly influences the flow and heat transfer of downstream, which is more evident in metal based materials, especially resulted by its isotropic features. Compared with the cylindrical film hole, the structure of step plane efficiently decreases the coolant flow velocity which results in a decrease of the CVP intensity so that the cooling film is adherent to the wall. The thermal conductivity of metal base material is strong, which has a great influence on the temperature distribution inside the wall. Velocity pulsation tightly influenced by CVP, in where the CVP intensity is strong, velocity pulsation is also strong so that the coolant flow strongly mixes with the mainstream. The flow velocity and velocity pulsation decrease with the increasing of the area ratio of stepped hole. The influence of geometric parameters on the heat transfer performance is mainly due to the high heat transfer performance of the metal matrix material.

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“…The turn line has a complicated force condition for the tunnel with a small interval, and the process has great influence on each other during construction. [1][2][3][4][5] Therefore, the surrounding rock may become unstable or even fall down and the initial support may crack and be destroyed when the construction method of the underground excavation tunnel is not properly selected. [6][7][8][9][10][11] It is key to ensure tunnel construction safety to simulate the construction process of a small interval tunnel in the turn line of metro, [12][13][14][15][16] analyze the rationality of the proposed construction method, and predict the surrounding rock and initial support stress and deformation and possible damage parts.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis and application of the construction method for the small interval tunnel in the turn line of metro

et al. 2020

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The surrounding rock may become unstable or even fall down and the initial support may crack and be destroyed when the construction method of the underground excavation tunnel is not properly selected in the turn line of metro. . A section of the Santunbei turn line of Urumqi Metro Line 1# was taken as the engineering background. The proposed construction method was analyzed by numerical simulation. Numerical analysis shows that the final surface settlement caused by the proposed construction method is 3.0 mm and the horizontal convergence is 3.2 mm. It also turns out that the proposed construction method causes less deformation, and the method can be applied to the construction of the small interval tunnel in the Santunbei turn line of metro. The rationality of the method and numerical model was further verified by comparison between the monitored data of surface settlement, horizontal convergence and vault sinking, and numerical simulation results. Finally, the deformation and stress of the six construction methods were compared. The deformation and stress caused by the six construction methods are almost the same. It indicates that the construction spacing between the left and right tunnels does not affect the safety of tunnel construction. Therefore, the appropriate construction spacing could be selected according to the resource configuration, instead of deformation and stress.

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A Theoretical Calculation Method of Influence Radius of Settlement Based on the Slices Method in Tunnel Construction

Cited by 11 publications

References 30 publications

Image Fusion Algorithm at Pixel Level Based on Edge Detection

Image Fusion Algorithm at Pixel Level Based on Edge Detection

The Heat Transfer Characteristics in Stepped Hole of Traditional Metal Materials Induced by Stepped Film Holes

Numerical analysis and application of the construction method for the small interval tunnel in the turn line of metro

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