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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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Peeling behavior and spalling resistance of CFRP sheets bonded to bent concrete surfaces

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Acta Mechanica Sinica 2010年第2期26卷 257-264页

作者： Hong Yuan Faping Li MOE Key Lab of Disaster Forecast and Control in Engineering Institute of Applied Mechanics Jinan University 510632 Guangzhou China

In this paper, the peeling behavior and the spalling resistance effect of carbon fiber reinforced polymer （CFRP） sheets externally bonded to bent concrete surfaces are firstly investigated experimentally. Twenty one curved specimens and seven plane specimens are studied in the paper, in which curved specimens with bonded CFRP sheets can simulate the concrete spalling in tunnel, culvert, arch bridge etc., whereas plane specimens with bonded CFRP sheets can simulate the concrete spalling in beam bridge, slab.bridge and pedestrian bridge. Three kinds of curved specimens with different radii of curvature are chosen by referring to practical tunnel structures, and plane specimens are used for comparison with curved ones. A peeling load is applied on the FRP sheet by loading a circular steel tube placed into the central notch of beam to debond CFRP sheets from the bent concrete surface, meanwhile full-range load-deflection curves are recorded by a MTS 831.10 Elastomer Test System. Based on the experimental results, a theoretical analysis is also conducted for the specimens. Both theoretical and experimental results show that only two material parameters, the interfacial fracture energy of CFRP-concrete interface and the tensile stiffness of CFRP sheets, are needed for describing the interfacial spalling behavior. It is found that the radius of curvature has remarkable influence on peeling load-deflection curves. The test methods and test results given in the paper are helpful and availab.e for reference to the designer of tunnel strengthening.

关键词： FRP sheet · Interfacial fracture energy ·Debonding · Spalling resistance · Bent concrete surface

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Evaluation indexes of sand liquefaction analysed by rough set

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1st International Conference on Civil engineering, Architecture and Building Materials, CEABM 2011

作者： Liu, Nianping Wang, Hongtu Yuan, Zhigang Key Lab. for Exploitation of China Southwestern Resources and Environmental Disaster Control Eng. Chongqing University Ministry of Education Chongqing 400030 China State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam Chongqing University Chongqing 400030 China College of Environment and Resources Southwest University of Science and Technology Mianyang 621010 China

ISBN: (纸本)9783037851258

Sand liquefaction is a problem of complex evolution of the disaster, there is no accurate way to judge at present, this study put forward an analytical method to improve and optimize the evaluation system of sand liquefaction based on rough set. The significance of indexes are confirmed by calculating rough dependability between indexes and result for appraisement, the result show that SPT blow count has the greatest impact on the evaluation system, the groundwater level has greater impact, followed by the sand depth, epicenteral distance and duration. The proposed approach overcame the subjectivity of traditional weight determination method, so it is more objective and accurate, and it is reasonable and effective to optimize the evaluation index of sand liquefaction. © (2011) Trans Tech Publications.

关键词： Groundwater

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Numerical simulation and model test study of mechanismof bolt in deep tunnel

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Yantu Lixue/Rock and Soil Mechanics 2011年第SUPPL. 1期32卷 719-724+786页

作者： Chen, Hao Ren, Wei-Zhong Li, Dan Xia, Bin-Wei State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China College of Urban Construction Wuhan University of Science and Technology Wuhan 430065 China Key Lab. for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering Chongqing University Chongqing 400030 China

According to rock character of a certain soft rock tunnel of Chongqing, the model material is made from epoxy resin, polyamide, silicom rubber, firming agent of silicon rubber, quartz grit, powdery barite and gasoline. The physical model test of the unreinforced tunnel and bolt-reinforced tunnel are made in the true triaxial model test machine. By using strain measure technology, the strains of key parts of the surrounding rock and the bolt are measured;according to these data, the variability of the stress of surrounding rock and the variability of the axial force of the bolt are analyzed. The numerical simulation are made with the same boundary condition as the model test;according to these data, the plastic zone, stress field and the deformation of the surrounding rock are studied;the variation of the axial force of the bolt is studied. We compare the variation of stress of the surrounding rock and the variation of the axial force of the bolt of the model test with the numerical simulation and draw the conclusion that the two processes coincide with each other.

关键词： Numerical models

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2011 2nd International Conference on Mechanic Automation and control engineering, MACE 2011

作者： Li, Xiaoshuang Li, Yaoji Yin, Guangzhi He, Lin National Engineering Research Center of Phosphate Resources Development and Utilization Chongqing University Chongqing 400030 China State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam Chongqing University Chongqing 400030 China Key Lab. for the Rsrc. Exploitation and the Environ. Disaster Control Engineering in Southwest China State Ministry of Education Chongqing University Chongqing 400030 China Yunnan Phosphate Chemical Group Co. LTD. Jinning 650600 China

ISBN: (纸本)9781424494392

Based on the gently inclined medium thick phosphate rock of the deep part of the east mining section of +2150 level of Jinning-Six mine of Yunnan phosphate Co., Ltd, the similar material physical model simulation experiment of the stability of stope pillars under room and pillar mining was carried out by the mine pressure plane stress modeling experimental frame of college of resource and environmental sciences. Based on the experimental results,the deformation and failure changing law of the above roof, surrounding rock mass and stope pillar during the mining along the strike direction of phosphate were investigated. The experimental results showed: (1) With the increasing of the scope of mined-out area, the fwassure zone and separation layer zone of the roof in the original mined-out area of the stope were pressed compact step by step. And when the space range of the mined-out area reached some scale, the deformation of the fwassure zone and separation layer zone of the roof in the original mined-out drived to stabilwasation, and the sustain action of it to the gravity fore of the overlying strata was reexternalization. (2)After the mining, the subsidence region of the overlying strata of the stope mainly concentrated the roof and surrounding rock mass which beside the mined-out area, the position of the maximum subsidence point was in the center zone of the excavation space, with the increasing of the dwastance from the center of the stope along the trend and normal of the ore body, the subsidence value of the overlying strata of the stope was monotone decreasing. With the increasing of the region of the excavation space, the mining influence region and the mining inflence degree of the overlaying strata of the stope gradually increased. And the corresponding position of the maximum subsidence zone dynamically forward leaded, the final subsidence curve of the overlying strata was a bowl shaped curve. (3)The defoemation and failure characterwastics of the overlyin

关键词： Room and pillar mining

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引用

2011 2nd International Conference on Mechanic Automation and control engineering, MACE 2011

ISBN: (纸本)9781424494392

Based on the gently inclined medium thick phosphate rock of the deep part of the east mining section of +2150 level of Jinning-Six mine of Yunnan phosphate Co., Ltd, the similar simulation model experiment of the stability of stope roof under cemented backfilling mining of waste rock was carried out by the mine pressure plane stress modeling experimental frame of college of resource and environmental sciences. Based on the experimental results, the stress changing law of the above roof of stope roof after the filling of stope along the strike direction of phosphate were investigated. Then the gently inclined medium thick phosphate rock of the deep part of the east mining section of Jinning-Six mine of Yunnan phosphate Co., Ltd could efficiently recover, and the surface in mining areas could also be protected. © 2011 IEEE.

关键词： Roofs

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Experimental investigation to effects of oleic acid and lauric acid on stabilization of magnetorheological fluids

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Gongneng Cailiao/Journal of Functional Materials 2011年第8期42卷 1504-1507页

作者： Xiong, Chen-Xi Peng, Xiang-He Yi, Cheng-Jian Department of Engineering Mechanics Chongqing University Chongqing 400044 China Key Lab. for the Exploitation of Southwest Resources and Environmental Disaster Control Eng. Chongqing University Chongqing 400044 China

The effects of oleic acid and lauric acid on the stabilization of magnetorheological fluids (MRF) were investigated experimentally. Several groups of samples were prepared, with both lauric acid and oleic acid as additives. The variations of the zero-field viscosity, mechanical property and sedimentation rate of these samples against time were tested, and the effects of volume fractions of lauric acid, oleic acid and carbonyl iron on the stabilization and mechanical property of the MRF samples were studied. The results indicated that the proper addition of lauric acid and oleic acid could significantly improve the mechanical property of magnetorheological fluids.

关键词： Stabilization

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FE analysis of microstructural magnetization and mechanical properties of magnetorheological fluids

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Gongneng Cailiao/Journal of Functional Materials 2011年第8期42卷 1500-1503页

作者： Yi, Cheng-Jian Peng, Xiang-He Sun, Hu Department of Engineering Mechanics Chongqing University Chongqing 400044 China Key Lab. for the Exploitation of Southwest Resources and Environmental Disaster Control Eng. Chongqing University Chongqing 400044 China

Taking into account the effects of the magnetic saturation and non-linear magnetization, a finite element analysis is performed for the magnetic-mechanic responses of a single chain in a magnetorheological fluid (MRF).The effect of the number of the particles in a chain on the shear resistance is *** used of a statistical approach, the critical shear stress of MRFs are obtained, and the results are identical with the experimental *** is found that finite element method can be used to describe the response of MRFs, which may be of help for the initial design and optimization of high-performance MRFs.

关键词： Finite element method

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Characteristics of deformation, failure and strain energy of sandstone under cycling loading in post-peak

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Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and engineering 2011年第SUPPL. 2期30卷 3892-3898页

作者： Guo, Chenye Xian, Xuefu Jiang, Yongdong Wang, Chen Key Lab. for Exploitation of Southwest Resources and Environmental Disaster Control Engineering Chongqing University Chongqing 400030 China Chongqing Energy Investment Group Science and Technology Co. Ltd. Chongqing 400060 China

In order to understand the characteristics of deformation, failure and strain energy of the fractured rock sample under continuous loading, triaxial compression tests of the sandstone sample from Yongchuan mine are carried out by a MTS815 rock testing system. Based on the experimental results, the fractured ratio(r) is developed, it reflects the ratio of the break between the fractured sample and the perfect sample, smaller r means the larger fracture for the rock sample, the maximum and the minimum value of r is 1and the ratio of residual strength and peak strength. The results of this analysis showed that the fractured ratio has good linear relationship with the secant modulus, axial strain, Poisson's ratio and strain energy;after continuous loading, the failure mode of fractured rock sample appears 'X' shear failure mode;the maximum of Poisson's ratio of rock can be determined by the test under continuous loading. These conclusions have a great significance to understand the mechanism of rock outburst and rockburst.

关键词： Rock mechanics

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Risk analysis of ground subsidence accidents caused by underground storage caverns in salt rock

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Yantu Lixue/Rock and Soil Mechanics 2011年第SUPPL.2期32卷 544-550页

作者： Jing, Wen-Jun Yang, Chun-He Kong, Jun-Feng Ji, Wen-Dong State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China Key Lab. for Exploitation of Southwestern Resources and Environmental Disaster Control Eng. Ministry of Education Chongqing University Chongqing 400044 China

In the construction and operation processes of underground storage cavern in bedded salt, ground subsidence, even earth surface collapse accidents, resulted by the storage cavern contraction and overlying rock deformation is an important accident type. Aimed at the ground subsidence accidents caused by underground storage cavern, this paper reveals the mechanism and builds the fault tree model of this type of accidents, finds out 14 failure patterns as well as 10 basic influence factors, also, puts forward the related control measures. Then Yunmeng-Yingcheng salt mine is taken as an example to forecast the severity of accident consequence. On the premise that ground subsidence accident happened at Yunmeng-Yingcheng salt mine, the severity probability of the accident consequence is analyzed using fuzzy comprehensive evaluation. Research results show that the severity of accident consequence belong to negligible level, to be considered level, serious level, very serious level and calamitous level are 0.24, 0.28, 0.29, 0.15, 0.04 respectively. The results are useful to prevent ground subsidence accidents caused by the storage caverns. What's more, it also provides according theory and a feasible way for appraising the loss severity before the accident happening.

关键词： Subsidence

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