Evaluation method of the falling of concrete piece from tunnel lining

2013 ◽  
pp. 474-481
Author(s):  
K Tsuno ◽  
Y Kojima ◽  
T Nakayama ◽  
T Ushida
Keyword(s):  
Evaluation Method ◽  
Tunnel Lining

scholarly journals Disease Evaluation of Existing Tunnel Lining Based on AHP-Extenics

2021 ◽  
Vol 283 ◽  
pp. 01023
Author(s):  
Danhong Wu ◽  
Li Wu ◽  
Chenyang Ma ◽  
Yufeng Wang ◽  
Dexin Lei ◽  
...  
Keyword(s):  
Index System ◽  
Evaluation Method ◽  
Early Stage ◽  
Safety Evaluation ◽  
Tunnel Lining ◽  
Evaluation Index ◽  
Engineering Practice ◽  
Factors Affecting ◽  
Geological Conditions ◽  
Lining Structure

The existing tunnel lining structure is easily affected by geological conditions, disturbance in the early stage of construction and operation in the later stage. This paper analyzes the main factors affecting the lining structure diseases of existing tunnels from three aspects of engineering construction, natural environment and engineering geology, starting from 13 independent factors affecting the lining structure diseases of existing tunnels. First of all, the index system of the formation factors of lining diseases in the reconstruction and expansion tunnel is established by using the analytic hierarchy process (AHP), and the hierarchical index system is put forward. Based on AHP-Extenics model, the evaluation method of lining structure disease of existing tunnel is proposed. Then, combined with engineering practice and expert scoring, the weight of safety evaluation index is determined, and the safety evaluation index and weight are expanded by using correlation function. Finally, the disease evaluation grade of the existing tunnel lining structure is obtained. This method uses the formal Extenics comprehensive evaluation model, which makes the calculation results more objective and provides a new method for the disease evaluation of the existing tunnel lining structure.

scholarly journals EVALUATION METHOD FOR SOUNDNESS OF LINING CONCRETE BY TUNNEL-LINING CRACK INDEX

2009 ◽  
Vol 65 (1) ◽  
pp. 11-16 ◽  
Author(s):  
Takaaki YAMADA ◽  
Nobuo SANO ◽  
Koji BABA ◽  
Yoshiyuki SHIGETA ◽  
Isamu YOSHITAKE ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Tunnel Lining ◽  
Crack Index

scholarly journals EVALUATION METHOD OF CRACK PROPAGATION OF TUNNEL LINING VALIDATION

2017 ◽  
Vol 73 (3) ◽  
pp. I_10-I_20 ◽  
Author(s):  
Shinobu KAISE ◽  
Tetsuo ITO ◽  
Hiroshi YAGI ◽  
Maresuke MIZUNO ◽  
Kouki MAEDA ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Evaluation Method ◽  
Tunnel Lining

Evaluation method for imaging plate resolution by means of phase contrast transfer function

1995 ◽  
Vol 53 ◽  
pp. 662-663 ◽  
Author(s):  
T. Oikawa ◽  
H. Kosugi ◽  
F. Hosokawa ◽  
D. Shindo ◽  
M. Kersker
Keyword(s):  
Transfer Function ◽  
Phase Contrast ◽  
Evaluation Method ◽  
Amorphous Film ◽  
Imaging Plate ◽  
X Rays ◽  
Special Shape ◽  
Contrast Transfer Function ◽  
Contrast Image ◽  
Specimen Shape

Evaluation of the resolution of the Imaging Plate (IP) has been attempted by some methods. An evaluation method for IP resolution, which is not influenced by hard X-rays at higher accelerating voltages, was proposed previously by the present authors. This method, however, requires truoblesome experimental preperations partly because specially synthesized hematite was used as a specimen, and partly because a special shape of the specimen was used as a standard image. In this paper, a convenient evaluation method which is not infuenced by the specimen shape and image direction, is newly proposed. In this method, phase contrast images of thin amorphous film are used.Several diffraction rings are obtained by the Fourier transformation of a phase contrast image of thin amorphous film, taken at a large under focus. The rings show the spatial-frequency spectrum corresponding to the phase contrast transfer function (PCTF). The envelope function is obtained by connecting the peak intensities of the rings. The evelope function is offten used for evaluation of the instrument, because the function shows the performance of the electron microscope (EM).

Combining Values

2002 ◽  
Vol 7 (2) ◽  
pp. 1-4, 12 ◽  
Author(s):  
Christopher R. Brigham
Keyword(s):  
Lower Extremity ◽  
Upper Extremity ◽  
Evaluation Method ◽  
Proximal Phalanx ◽  
Common Error ◽  
The Third ◽  
Whole Person ◽  
Impairment Ratings ◽  
Upper Extremity Impairment ◽  
The Individual

Abstract To account for the effects of multiple impairments, evaluating physicians must provide a summary value that combines multiple impairments so the whole person impairment is equal to or less than the sum of all the individual impairment values. A common error is to add values that should be combined and typically results in an inflated rating. The Combined Values Chart in the AMA Guides to the Evaluation of Permanent Impairment, Fifth Edition, includes instructions that guide physicians about combining impairment ratings. For example, impairment values within a region generally are combined and converted to a whole person permanent impairment before combination with the results from other regions (exceptions include certain impairments of the spine and extremities). When they combine three or more values, physicians should select and combine the two lowest values; this value is combined with the third value to yield the total value. Upper extremity impairment ratings are combined based on the principle that a second and each succeeding impairment applies not to the whole unit (eg, whole finger) but only to the part that remains (eg, proximal phalanx). Physicians who combine lower extremity impairments usually use only one evaluation method, but, if more than one method is used, the physician should use the Combined Values Chart.

Sign in / Sign up

Export Citation Format

Share Document