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作者： Yu, Ling Xu, Peng MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China Department of Civil Engineering China Three Gorges University Yichang 443002 China

Structural damage detection remains as a challenging task in the field of structural health monitoring (SHM), which has occupied many scientific communities over the last two decades. As a new exploring attempt to the SHM problem, this paper proposes an ant colony optimization (ACO) based algorithm for continuous optimization problems on structural damage detection in the SHM field. First of all, the theoretical background of ACO is introduced for search of approximation best solution to discrete optimization problems and further to continuous optimization problems. Then four benchmark functions are used to evaluate the performance of continuous ACO (CnACO) algorithm. After that, the problem on the structural damage detection is mathematically converted into a constrained optimization problem, which is then hopefully solved by the CnACO algorithm. Meanwhile, effect of measurement noise on the algorithm is considered in all the damage scenarios. Upon extensive numerical simulations for single and multiple damages of a 2-storey rigid frame structure, the proposed method is extended to four damage patterns of a building model of 3-storey steel frame structure made in lab.ratory for further experimental verification of the proposed method. Illustrated results show that the proposed method is very effective for the structural damage detection. Regardless of weak damage or multiple damages, the identification accuracy is very high and the noise immunity is better, which shows that the proposed method is feasible and effective in the SHM field. © 2010 Elsevier Ltd. All rights reserved.

关键词： Ant colony optimization

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Simulation on the deformation and failure response features and stability of a slope from open pit mining to underground mining under the effecting of excavation goaf by the floor friction model

Beijing Keji Daxue Xuebao/Journal of University of Science a...

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Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing 2012年第3期34卷 231-238页

作者： Yin, Guang-Zhi Li, Xiao-Shuang Li, Yao-Ji State key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing 400030 China Key Lab. for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering Ministry of Education of China Chongqing University Chongqing 400030 China National Engineering Research Center of Phosphate Resources Development and Utilization Kunming 650000 China Yunnan Phosphate Chemical Group Co. Ltd. Jinning 650600 China

Based on the gently inclined medium thick phosphate rock at the deep part of the east mining section of Jinning-Six Mine, Yunnan Phosphate Co. Ltd. from open pit mining to underground mining, floor friction model tests under the condition of different slope heights and boundary thicknesses were carried out with a floor friction model instrument. The results show that the deformation and failure response features of the slope can be divided into three stages: fracture and loose in a small range, unstable failure in a local range, and instability failure in the whole range of slope rock sliding to the goaf. The main deformation and failure modes of the slope are tension cracking, breakage, and sliding failure. When the slope height is fixed, with the boundary thickness gradually decreasing from 30 m to 20 m and 10 m, the stability of the slope is directly proportional to the boundary thickness, and the reasonable boundary thickness is 20 m to 30 m. When the boundary thickness is fixed, with the slope height increasing from 60 m to 108 m, the stability of the slope is inversely proportional to the slope height, and the slope of 108 m from open pit mining to underground mining is unstable.

关键词： Slope stability

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RETRACTED ARTICLE: Numerical simulation of rockfall impact force in the case of oblique impacting

RETRACTED ARTICLE: Numerical simulation of rockfall impact f...

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作者： Ye, Siqiao Li, Ke Chen, Hongkai Key Lab. for the Exploitation of Southwestern Resources Environmental Disaster Control Engineering Ministry of Education Chongqing China Institute of Geotechnical Engineering Chongqing Jiaotong University Chongqing China

ISBN: (纸本)9781457702907

The impact force by rockfall events is the main loads for structure design such as tunnel entrances and rockfall passive mitigation mearsures. But the impact force formula are empirical or theoretical calculation methods in the case of positive impact. To solve the impact force calculation problem in case of olique impact, by systematicly comparative analysis between numerical simulation and formula calculation method in case of different impacting speed, different buffer layer thickness and different rockfall size, the authors found that numerical analysis and formula calculated results changed in the same way. And the numerical differences are within 10%. It si proved that by speed decomposition, extending the positive impact force calculation mehtod to the the oblique collision is feasible. But also for calculation of rockfall impact force beyond the scope of the formula, numerical simulation is a feasible way. © 2011 IEEE.

关键词： Numerical methods

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Volume shrinkage risk analysis of salt rock cavern gas storage based on reliability method

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Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and engineering 2012年第SUPPL. 2期31卷 3673-3680页

作者： Jing, Wenjun Cheng, Lin Yang, Chunhe Xu, Yulong Zhang, Yujun Shi, Xilin State Key of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan Hubei 430071 China Petro China West East Gas Pipeline Company Shanghai 200122 China Key Lab. for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering Ministry of Education Chongqing University Chongqing 400044 China

Effective volume reduction resulted by cavern shrinkage is one of the common risk types in the operation phase of salt cavern gas storage. Cavern shrinkage risk will lead to damage or collapse of cavern wall rock, even serious accidents. Aimed at the possible cavern shrinkage risk during operation phase of salt cavern gas storage, volumetric shrinkage formula of steady state creep phase is derived on the condition of spherical cavern with constant internal pressure in the limitless and ideal salt rock. Combined with the cavern shrinkage risk classification of salt cavern gas storage, the limit state equation of cavern volume shrinkage is created. On the assumption that every random variable in the limit state equation follows normal distribution, probability of risk occurrence under different levels is calculated using reliability analysis. Then the change regularity of stress-difference between grostress and internal pressure and risk probability of every level is analyzed. Lastly, the elastic deformation, initial creep deformation and accelerated creep deformation are taken into consideration and the calculations result is discussed. The research results can provide theoretical reference for the operation management of salt cavern gas storage.

关键词： Rock mechanics

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engineering practice and analysis of limit roof diameter in building sump of salt cavern for gas storage

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Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and engineering 2012年第SUPPL. 2期31卷 3703-3709页

作者： Qu, Dan'an Shi, Xilin Li, Yinping Yang, Chunhe Ma, Hongling Zhang, Guimin Key Lab. for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering Chongqing University Chongqing 400044 China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy Sciences Wuhan Hubei 430071 China West-to-East Gas Pipeline Company Gas Storage Project Department PetroChina Company Limited Jintan Jiangsu 213200 China

According to the analysis of an engineering case of building sump of Jintan salt cavern, some problems existing in the engineering case are discussed. The experience and lesson are summarized, and some ideas and suggestions are proposed. Then, some key factors that should be considered in the design progress of solution mining are discussed. The necessity of determining limit diameter of cavern roof is expounded. And a method of calculating limit exposed diameter of cavern roof is presented. With this method, the limit roof diameters of some salt caverns are studied basing on simulation test. The limit roof diameters of salt caverns with different lateral solution angles and cavern heights are obtained, and their laws are studied.

关键词： Rock mechanics

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Perturbation Analysis of Instability for Non-uniform Cylindrical Shells with Initial Imperfection

Perturbation Analysis of Instability for Non-uniform Cylindr...

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2011 China control and Decision Conference(2011中国控制与决策会议 CCDC)

作者： Jianghong Xue Department of Mechanics and Civil Engineering Jinan University / Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Guangzhou 510632

Buckle propagation in subsea corroded pipelines is one of the most concerned problems in offshore industries, while locating the plastic hinges in the corroded pipeline is the crux in determining the buckle propagation pressure. This paper presents a methodology to determine the locations of plastic hinges in non-uniform shells subjected to external pressure. The non-uniform shell used to model the corroded pipeline has two Regions: Region 1 of reduced, inconstant thickness and Region 2 of nominal thickness. Analytical formulas for the bifurcation load, radial deformation, initial yield pressure and stress distribution in the non-uniform shell are derived from perturbation analysis using WKB expansion. The locations of plastic hinges are identified at the stress peaks by taking the derivative of the stress with respect to circumferential coordinate. Imperfection sensitivity of the non-uniform shell is assessed with an emphasis on the role of initial yield pressure and the locations of plastic hinges. Special case when the thickness of Region 2 is constantly reduced is examined. It is found that both the initial yield pressure and the locations of plastic hinges depend on the non-uniform conditions of the cylindrical shell.

关键词： Perturbation Analysis Location of Plastic Hinge Corroded Pipeline Buckle Propagation

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Application of Support Vector Machines in the prediction of broken zone in surrounding rock

Application of Support Vector Machines in the prediction of ...

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2011 International Conference on Remote Sensing, Environment and Transportation engineering, RSETE 2011

作者： Guo, Wei Jiang, Deyi Liu, Chun Key Lab. for the Exploitation of Southwestern Rsrc. and the Environ. Disaster Control Eng. Ministry of Education Chongqing University Chongqing China Safety Engineering College Chongqing University of Science and Technology Chongqing China

ISBN: (纸本)9781424491711

Introduce the principles of Support Vector Machines, and indicate the broken zone thickness can be forecasted by four factors: rock strength, joint coefficient, buried depth and span length. The results show that Support Vector Machine (SVM) is a reliable method to predict broken zone thickness, and the predictive values agree well with the verify data. © 2011 IEEE.

关键词： Support vector machines

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FAR FIELD SOLUTION OF SH-WAVE SCATTERED BY A CAVITY WITH ARBITRARY SHAPE IN ANISOTROPIC MEDIUM

FAR FIELD SOLUTION OF SH-WAVE SCATTERED BY A CAVITY WITH ARB...

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The 2011 Symposium on Piezoelectricity,Acoustic Waves and Device Applications(2011年全国压电和声波理论及器件技术研讨会)

作者： Zhi-gang Chen Jia-long Wu Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Jinan University Gu Department of Mechanics and Civil Engineering Jinan University Guang Zhou 510632 China

Based on the method of complex functions, the SH-wave scattered by a cavity with arbitrary shape in infinite anisotropic medium is investigated, and a far field solution of displacement is presented. As a result, the far field properties of the SH-wave scattered by circular, elliptical and square cavities in an anisotropic elastic medium with a symmetry plane are analyzed and some curves describing the far field properties of scattering SH-wave are obtained. The results show that the far field characteristic properties of the scattering SH-wave are determined by the incident wave, the geometric shape and the properties of medium. Additionally, the anisotropy of elastic medium has more significant influence on the far field displacement distribution than isotropy.

关键词： anisotropic medium cavity with arbitrary shape SH wave scattering far field solution complex functions

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Rockfalls movement mode and movement features by field tests

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Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental engineering 2011年第2期33卷 18-23+44页

作者： Ye, Si-Qiao Chen, Hong-Kai Xu, Jiang Key Lab. for the Exploitation of Southwestern Resources and the Environmental Disaster Control Eng. Chongqing 400044 China Institute of Geotechnical Engineering Chongqing Jiaotong University Chongqing 400074 China

Field test is a better way to find sensitive factors, explore movement law and get movement parameters in rockfall study. To analyze the influence of rockfall shape, size and movement patterns on its movement law, 112 rockfall field tests are implemented. Statistics of horizontal movement distance and velocity under the influence of rockfall shape, size, and rebounce time are conducted. The results show that no matter what shape rockfall is, its movement mode are limited to rolling and bouncing, and there is no apparent sliding section. And about 59% test rockfalls are intercepted by the platform of slope and roadside trench which can be selected as passive mitigation measures. The spherical, square and short cylinder rockfalls have longer horizontal movement distance, bigger faster velocity, and the same movement features. But the rectangular and sheet rockfalls have poor movement capacity, and their movement features are similar to that of the long cylinder rockfall. To sum up, the cylinder assumption for rockfall movement calculation is more realistic. The rockfalls with smaller quality have the worse movement capacity but the greater randomness. When the rockfalls roll mainly, the kinetic energy loss is serious, and both horizontal movement distance and velocity are greater when it bounces mainly. Furthermore, when rockfall collides with the slope surface, its movement parameters and direction will change dramatically.

关键词： Kinetic energy

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Analysis of Characteristics of Compound Vibration and Effects to Surrounding Gas Pipeline Caused by Impact and Explosion

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Procedia engineering 2011年 26卷 1835-1843页

作者： Su Hua-you Huang Jin Xiao Ding-jun She Yan-hua College of Environment and Resource Southwest University of Science and Technology Mianyang 621010 China Key Lab. for the Exploitation of Southwestern Resources & the Environmental Disaster Control Engineering Ministry of Education in China Chongqing 40044 China

The vibration load caused by the impact and explosion in construction exerts great influence on the surrounding earth. Therefore, the safe operating condition of gas pipeline is seriously influenced. For the first time, by use of smart microseismic monitoring system, such vibration caused by the impact and explosion is monitored and analyzed. First, it reveals the transmission law of vibrating wave forms. Second, the coupling calculating models of pipeline earth under the influence of vibration is built. Finally, the characteristics of exerted force and transformation of earth-pipeline system are analyzed. According to these microseismic data obtained from the spot and numerical simulation method, the dynamic response of underground pipeline under compound vibration is studied; nonlinear mathematical model theory and method for coupling effects of earth and pipeline are built; the effects of vibration to pipeline are assessed; the feasible assessing method of safe operating condition of gas pipeline under vibration is explored and developed.

关键词： vibration load microseismic monitoring blasting gas pipeline

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