A Transient Stability Evaluation Method Based on Kinetic Energy of Post-Fault Trajectories

2006 ◽  
Author(s):  
Takahiro Okuda ◽  
Shinichi Nakagawa ◽  
Shinichi Iwamoto
Keyword(s):  
Kinetic Energy ◽  
Transient Stability ◽  
Evaluation Method ◽  
Stability Evaluation

Transient stability evaluation method based on kinetic energy of postfault trajectories

2010 ◽  
Vol 174 (3) ◽  
pp. 18-24
Author(s):  
Takahiro Okuda ◽  
Shinichi Nakagawa ◽  
Yuta Ohsaki ◽  
Shinichi Iwamoto
Keyword(s):  
Kinetic Energy ◽  
Transient Stability ◽  
Evaluation Method ◽  
Stability Evaluation

Transient Stability Evaluation Method based on Kinetic Energy of Post-Fault Trajectories

2008 ◽  
Vol 128 (10) ◽  
pp. 1265-1270
Author(s):  
Takahiro Okuda ◽  
Shinichi Nakagawa ◽  
Yuta Ohsaki ◽  
Shinichi Iwamoto
Keyword(s):  
Kinetic Energy ◽  
Transient Stability ◽  
Evaluation Method ◽  
Stability Evaluation

scholarly journals Stability Evaluation Method of Hole Wall for Bored Pile under Blasting Impact

Symmetry ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 79
Author(s):  
Qiuwei Yang ◽  
Zhikun Ba ◽  
Zhuo Zhao ◽  
Xi Peng ◽  
Yun Sun
Keyword(s):  
Pile Foundation ◽  
Evaluation Method ◽  
Impact Load ◽  
Stability Evaluation ◽  
Foundation Construction ◽  
Concentration Problem ◽  
Hole Wall ◽  
Failure Theory ◽  
Collapse Failure ◽  
The Stability

Blasting impact load may be encountered during the construction of some pile foundation projects. Due to the effect of blasting impact, hole collapse can easily occur in the hole-forming stage of pile foundation construction. In order to prevent hole collapse, it is very necessary to evaluate the stability of a pile hole wall before pile foundation construction. The calculation of hole collapse can usually be attributed to an axisymmetric circular hole stress concentration problem. However, the existing collapse failure theory of pile hole hardly considers the effect of blasting impact load. In view of this, this paper proposes the stability evaluation method of a pile hole wall under blasting impact. Compared with the existing collapse failure theory, the proposed method fully considers the effect of blasting impact stress. Using Mohr–Coulomb strength theory and symmetry analysis, the strength condition of collapse failure is established in this work for accurate evaluation of the stability of a hole wall. The proposed stability evaluation method is demonstrated by a pile foundation construction project of a bridge. Moreover, a shaking table test on the pile hole model was performed to verify the proposed method by experimental data. The results indicate the effectiveness and usability of the proposed method. The proposed method provides a feasible way for the stability analysis of a pile hole wall under blasting impact.

scholarly journals Stability evaluation method for assessing bedrock and overburden layer slope (BOLS) under seismic load

2021 ◽  
Vol 861 (5) ◽  
pp. 052035
Author(s):  
Weizhi Chen ◽  
Weijing Min ◽  
Yuchun Yao ◽  
Anhong Li ◽  
Yong Liu ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Seismic Load ◽  
Stability Evaluation

scholarly journals Study on the Applicability of Dynamic Stability Evaluation Criteria by Comparison of Trackside Measurement Results of Different Track Structures

2020 ◽  
Vol 10 (22) ◽  
pp. 8245
Author(s):  
Kyuhwan Oh ◽  
Jaeik Lee ◽  
Junhyeok Choi ◽  
Yonggul Park
Keyword(s):  
Dynamic Stability ◽  
Evaluation Method ◽  
Evaluation Criteria ◽  
Railway Track ◽  
Stability Evaluation ◽  
Design Specification ◽  
Wheel Load ◽  
Field Instrumentation ◽  
Load Fluctuation ◽  
Concrete Type

Countries such as Korea adopt design codes, evaluation criteria and specifications from standards originating abroad; this leads to a lack of distinction of the separate applications of dynamic stability evaluation parameters between various track structures of different track moduli. This paper discusses the applicability of the dynamic stability evaluation method of railway track structures by assessing 10 different types of railway track sections of a newly constructed railway operation line (5 ballasted and 5 concrete type track structures) by field instrumentation testing. Parameters of track support stiffness (TSS), wheel load fluctuation, derailment coefficient, and rail displacement are measured. The respective results are first compared to the standard criteria (design specification) and comparisons between the different track types are presented as ratios. Findings show that while all of the tracks satisfy the design specification requirements, each track type measurement result varies by a noticeable degree, particularly when comparing between concrete and ballast type track structures. Results of the study demonstrate that using the same dynamic stability evaluation criteria can lead to an incorrect assessment of the track performance evaluation of track structure, and a separate evaluation parameter for ballasted and concrete track structures is required.

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