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Generalized response displacement methods for seismic analysis of underground structures with complex cross section

Earthquake engineering and engineering Vibration 2023年第4期22卷 979-993页

作者： Xu Zigang Ding Linling Du Xiuli Xu Chengshun Zhuang Haiyang Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering East China Jiaotong UniversityNanchang 330013China Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education Beijing University of TechnologyBeijing 100124China

The response displacement method(RDM)is recommended for the seismic analysis of underground structures in the transverse direction for many codes,including bases for design of structures-seismic actions for designing geotechnical works(ISO 23469)and code for seismic design of urban rail transit structures(GB 50909-2014).However,there are some obvious limitations in the application of *** and the shear stress of the soil could be approximately evaluated for the structures having a simple cross section,such as rectangular and circular *** is necessary to propose simplified seismic analysis methods for structures with complex cross *** paper refers to the idea of RDM and proposes three generalized response displacement methods(GRDM).In GRDM1,a part of the soil surrounding a structure is selected to generate a generalized underground structure with a rectangular cross section,and the same analysis model as RDM is applied to analyze the responses of the *** GRDM2,a hollow soil model without a generalized structure is used to compute the equivalent load caused by the relative displacement of the soil,and the soil-structure interaction model is applied to calculate the responses of the *** GRDM3,a continuous soil model is applied to compute the equivalent load caused by the relative displacement and shear stress of the soil,and the soil-structure interaction model is applied to analyze the responses of the structure,which is the same as the model used in *** time-history analysis method(THAM)is used to evaluate the accuracy of the proposed simplified *** show that the error of GRDM1 is about 20%,while the error is only 5%for GRDM2 and *** the three proposed methods,GRDM3 has obvious advantages regarding calculation efficiency and ***,it is recommended to use GRDM3 for the seismic response analysis of underground structures that have conventional simple or complex cross sections.

关键词： underground structures seismic analysis response displacement method equivalent seismic load complex cross section

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Interactions between H_(2)O_(2)and dissolved organic matter during granular activated carbon-based residual H_(2)O_(2)quenching from the upstream UV/H_(2)O_(2)process

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Journal of environmental Sciences 2023年第6期128卷 139-149页

作者： Yaoyao Kang Junfeng Lian Yichun Zhu Zuwen Liu Wentao Li Huiyu Dong Yuanyue Wang Jinfeng Zeng Zhimin Qiang Jiangxi Provincial Key Laboratory of Environmental Geotechnology and Engineering Disaster Control Jiangxi University of Science and TechnologyGanzhou 341000China Ganzhou Key Laboratory of Basin Pollution Simulation and Control Jiangxi University of Science and TechnologyGanzhou 341000China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China CECEP Environmental Protection Investment Development(Jiangxi)Co.Ltd. Nanchang 330006China Hydrology and Water Resources Monitoring Center for Ganjiang Upstream Watershed Ganzhou 341000China

Granular activated carbon(GAC)filtration can be employed to synchronously quench residual H_(2)O_(2)from the upstream UV/H_(2)O_(2)process and further degrade dissolved organicmatter(DOM).In this study,rapid small-scale column tests(RSSCTs)were performed to clarify the mechanisms underlying the interactions between H_(2)O_(2)and DOM during the GAC-based H_(2)O_(2)quenching *** was observed that GAC can catalytically decompose H_(2)O_(2),with a long-lasting high efficiency(>80%for approximately 50,000 empty-bed volumes).DOM inhibited GAC-based H_(2)O_(2)quenching via a pore-blocking effect,especially at high concentrations(10 mg/L),with the adsorbed DOM molecules being oxidized by the continuously generated·OH;this further deteriorated the H_(2)O_(2)quenching *** batch experiments,H_(2)O_(2)could enhance DOM adsorption by GAC;however,in RSSCTs,it deteriorated DOM *** observation could be attributed to the different·OH exposure in these two *** was also observed that aging with H_(2)O_(2)and DOM altered the morphology,specific surface area,pore volume,and the surface functional groups of GAC,owing to the oxidation effect of H_(2)O_(2)and·OH on the GAC surface as well as the effect of ***-tionally,the changes in the content of persistent free radicals in the GAC samples were insignificant following different aging *** work contributes to enhancing understanding regarding the UV/H_(2)O_(2)-GAC filtration scheme,and promoting the application in drinking water treatment.

关键词： Granular activated carbon H_(2)O_(2)quenching Dissolved organic matter Rapid small-scale column tests Persistent free radicals

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Rock strength weakening subject to principal stress rotation:Experimental and numerical investigations

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Journal of Rock Mechanics and geotechnical engineering 2024年第9期16卷 3544-3557页

作者： Huandui Liu Guibin Wang Chunhe Yang Junyue Zhang Shiwan Chen State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China State Key Laboratory of Coal Mine Disaster Dynamics and Control College of Resources and Environmental SciencesChongqing UniversityChongqing400044China College of Resources and Environmental Engineering Guizhou UniversityGuiyang50025China

During the construction and operation of gas storage reservoirs,changes in the principal stress direction can induce fracture propagation under conditions of lower differential stress,potentially leading to failure in the surrounding ***,the weakening of strength due to pure stress rotation has not yet been *** on fracture mechanics,an enhanced Mohr-Coulomb strength criterion considering stress rotation is proposed and verified with experimental and numerical *** micro-damage state and the evolution of the rock under the pure stress-rotation condition are *** findings indicate that differential stress exceeding the crack initiation stress is a prerequisite for stress rotation to promote the development of rock *** the differential stress increases,stress rotation is more likely to induce rock damage,leading to a transition from brittle to plastic failure,characterized by wider fractures and a more complex fracture ***,a negative exponential relationship exists between the stress rotation angle required for rock failure and the differential *** feasibility of applying the enhanced criterion to practical engineering is discussed using monitoring data obtained from a mine-by *** study introduces new concepts for understanding the damage evolution of the surrounding rock under complex stress paths and offers a new theoretical basis for predicting the damage of gas storage reservoirs.

关键词： Principal stress rotation(PSR) Fracture mechanics Hollow cylinder torsional apparatus for rock (HCAR) Particle flow method Rock strength

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Effect of Low-intensity Ultrasound on Cd Tolerance of Partial Nitrification Sludge 10

Effect of Low-intensity Ultrasound on Cd Tolerance of Partia...

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10th Annual International Conference on Material Science and environmental engineering, MSEE 2022

作者： Chen, Peiwen Zhu, Yichun Yang, Jieyuan Lai, Yafen Jiangxi Key Laboratory of Environmental Geotechnical and Engineering Disaster Control Ganzhou341000 China Engineering Technology Research Center for Water Quality Safety Assurance of Ganjiang River Basin Jiangxi University of Science and Technology Ganzhou341000 China

Cadmium (Cd) is a typical nitrification inhibitor, which has a strong inhibitory effect on partial nitrification (PN). The discrepancy on Cd tolerance of PN sludge caused by low-intensity ultrasound (LIU) was studied. It suggested that the half inhibitory concentration (IC50) of sludge was increased from 24.51 to 29.07 mg/L by 35 days of ultrasonic treatment, and the Cd tolerance of sludge was enhanced. Further analysis indicated that contents of extracellular polymeric substances (EPS) rose substantially because of LIU, which played a catalytic role on increasing adsorption capacity of PN sludge for Cd. © Published under licence by IOP Publishing Ltd.

关键词： Nitrification

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Comparative experimental study on porosity, mechanical and CO_(2) adsorption characteristics of coal and shale

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Frontiers of Earth Science 2023年第3期17卷 788-796页

作者： Haitao LI Guo YU Xiaolei WANG Dongming ZHANG Exploration and Development Research Institute of PetroChina Southwest Oil and Gas Field CompanyChengdu 610051China PetroChina Southwest Oil and Gas Field Company Planning Department Chengdu 610051China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China School of Resources and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

To compare the pore structure, mechanical and CO_(2) adsorption properties of coal and shale, a series of experiments were carried out using nuclear magnetic resonance (NMR), uniaxial compression, Brazilian splitting, and high-pressure CO_(2) adsorption. The results show that the total porosity of coal is 7.51 times that of shale, and shale is dominated by adsorption pores, while adsorption pores and seepage pores in coal are equally important. Moreover, it is found that the micropores in shale are more advantageous, while meso-macropore in coal are more significant. The adsorption pore surface of coal is rougher than that of shale, and the seepage pore structure of shale is more complex. The uniaxial compressive strength, elastic modulus and absorption energy of shale are 2.01 times, 2.85 times, and 1.27 times that of coal, respectively, indicating that shale has higher compressive capacity and resistance to elastic deformation than coal. The average tensile strength, Brazilian splitting modulus, absorbed energy and brittleness index of shale are 7.92 times, 6.68 times, 10.78 times, and 4.37 times that of coal, respectively, indicating that shale has higher tensile strength and brittleness, but lower ductility, compared with coal. The performed analyses show that under the same conditions, the CO_(2) adsorption capacity of coal is greater than that of shale. The present article can provide a theoretical basis to implement CO_(2)-enhanced coalbed methane (CBM)/shale gas extraction.

关键词： coal shale NMR mechanical properties adsorption characteristic

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Predicting impact forces on pipelines from deep-sea fluidized slides:A comprehensive review of key factors

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International Journal of Mining Science and Technology 2024年第2期34卷 211-225页

作者： Xingsen Guo Ning Fan Defeng Zheng Cuiwei Fu Hao Wu Yanjun Zhang Xiaolong Song Tingkai Nian State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Department of Civil Environmentaland Geomatic EngineeringUniversity College LondonLondon WC1E 6BTUnited Kingdom Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean University of ChinaQingdao 266100China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China College of Civil Engineering and Architecture Wenzhou UniversityWenzhou 325035China Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation of Zhejiang Province Wenzhou 325035China Zhejiang International Science and Technology Cooperation Base of Ultra-soft Soil Engineering and Smart Monitoring Wenzhou 325035China School of Geography Liaoning Normal UniversityDalian 116029China China Railway First Survey and Design Institute Group Co. Ltd.Xi’an 710043China Department of Geotechnical Engineering Nanjing Hydraulic Research InstituteNanjing 210024China Wuhan Center China Geological Survey(Central South China Innovation Center for Geosciences)Wuhan 430205China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China

Deep-sea pipelines play a pivotal role in seabed mineral resource development,global energy and resource supply provision,network communication,and environmental ***,the placement of these pipelines on the seabed surface exposes them to potential risks arising from the complex deep-sea hydrodynamic and geological environment,particularly submarine *** incidents have highlighted the substantial damage to pipelines due to ***,deep-sea fluidized slides(in a debris/mud flow or turbidity current physical state),characterized by high speed,pose a significant *** assessing the impact forces exerted on pipelines by fluidized submarine slides is crucial for ensuring pipeline *** study aimed to provide a comprehensive overview of recent advancements in understanding pipeline impact forces caused by fluidized deep-sea slides,thereby identifying key factors and corresponding mechanisms that influence pipeline impact *** factors include the velocity,density,and shear behavior of deep-sea fluidized slides,as well as the geometry,stiffness,self-weight,and mechanical model of ***,the interface contact conditions and spatial relations were examined within the context of deep-sea slides and their interactions with *** upon a thorough review of these achievements,future directions were proposed for assessing and characterizing the key factors affecting slide impact loading on pipelines.A comprehensive understanding of these results is essential for the sustainable development of deep-sea pipeline projects associated with seabed resource development and the implementation of disaster prevention measures.

关键词： Deep-sea fluidized slides Pipes Impact forces Shear behavior of slides Interface contact conditions Spatial relation

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Application of Water Quality Index in the Evaluation of an Abandoned Mine Areas of Xunwu, China

Application of Water Quality Index in the Evaluation of an A...

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2020 International Conference on Innovative Solutions in Hydropower and environmental and Civil engineering

作者： Yin, Shiyun Liu, Zuwen Yang, Shi Lin, Yuan Jiangxi Key Laboratory of Environmental Geotechnical and Engineering Disaster Control Ganzhou341000 China Engineering Technology Research Center for Water Quality Safety Assurance of Ganjiang River Basin Jiangxi University of Science and Technology Ganzhou341000 China

Within the display think about, an surrendered ion-type rare soil mine contains a tremendous affect on the encompassing water environment contamination in Xunwu, jiangxi Province, China. Since the usage of coordinates remediation innovation and extend in 2018, its natural quality has been enormously moved forward. In arrange to encourage assess the environmental remediation impact, a altered water quality index strategy (WQI) is proposed. Concurring to the grid method, 16 water quality examining focuses were set within the surrendered mine remediation extend, and 9 key assessment records such as NH4+-N and heavy metals were chosen for principal component analysis (PCA) and factor analysis (FA), in arrange to comprehensively assess the worldly and spatial changes of different contamination variables within the deserted mine environmental remediation range. The results uncovered that the water quality of the surface water has been slowly progressed, and the generally water quality has been getting superior, among which the water quality in August is clearly superior than that in July, and the progressed water quality index is successful for the classification of water quality and the assessment of the transient and spatial changes of water quality within the remediation of surrendered mines. © Published under licence by IOP Publishing Ltd.

关键词： Water quality

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Structural Characteristics and Properties of Ca-Sa-Pw/Eg Adsorbed into Porous Cement-Based for Thermal Storage

SSRN

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SSRN 2023年

作者： Liang, Ximei Fei, Hua Li, Yuanlin Li, Peisheng Du, Wenqing Zhou, Jiahong Jiangxi Province Key Laboratory of Environmental Geotechnical Engineering and Hazards Control Jiangxi University of Science and Technology Jiangxi Province Ganzhou341000 China Energy and Power Engineering Nanchang Institute of Technology Nanchang330000 China

In this work, a ternary phase change material (PCM) was manufactured by mixing capric acid-stearic acid (CA-SA) and paraffin (PW) and packaged and shaped with expanded graphite (EG) as a carrier. The CA-SA-PW/EG material cement mortar was prepared by direct stirring, and its thermal conductivity, thermal stability, and heat storage properties were investigated. When the PCM content reaches 15% (PCM-4), the thermal conductivity of the composite phase change cement plate is 1.566 W/(m·K). During the static heat storage, the PCM-4 cement plate showed evident thermal stagnation, reduced by 4.7 ℃. In the light heat storage, when the heating surface of each cement plate reaches 55 ℃, the temperature difference between the heating surface and the light surface of PCM-4 is 23.11 ℃. The heating surface drops to 16.5 ℃, PCM-4 cement plate takes 3500s, delaying the temperature change effectively. The maximum temperature difference between the inner and outer surface of PCM-4 is 14.039 ℃ in the microchamber temperature control characteristics with 400 W heating, which is 62.5% larger than the ordinary cement plate. Moreover, the temperature damping of the cement plate reaches 1.30 in the range of 22-32 ℃. © 2023, The Authors. All rights reserved.

关键词： Phase change materials

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Study on Adsorption of Heavy Metals Cu and Zn by Microplastics Under Different Aged Factors

Study on Adsorption of Heavy Metals Cu and Zn by Microplasti...

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作者： Wenxi Teng Xiang Zhang Yalin Yang Jinfeng Zeng Junfeng Lian Xinxin Qin Ganzhou Key Laboratory of Basin Pollution Simulation and Control Jiangxi University of Science and Technology Hydrology and Water Resources Monitoring Center for Ganjiang Upstream Watershed Jiangxi Provincial Key Laboratory of Environmental Geotechnology and Engineering Disaster Control Jiangxi University of Science and Technology

Microplastics are widely distributed in a variety of environments,absorbing heavy metals in the environment while aging due to various environmental *** this paper,the effects of different aging factors（pH,DOM,and HO） on the adsorption capacity of heavy metals Cu and Zn on polyethylene microplastics（PE-MPs） were investigated,and the changes in physical and chemical properties of PE microplastics were *** results demonstrate that HO aging bears the greatest effect on the adsorption effect of PE microplastics,dissolved organic matter（DOM） aging has the least effect on the adsorption effect of PE microplastics,and the adsorption effect of microplastics aged with pH=9 is stronger than that aged with pH=4;the adsorption kinetics model of microplastics fitted to the pseudo-second-order kinetic model,and the thermodynamic model fitted to Langmuir model;aging mainly changed the surface structure of microplastics,increased the Zeta potential of microplastics,introduced more oxygen-containing functional groups,and finally affected the ability of microplastics to adsorb heavy *** research provides data reference for understanding the influence of different aging on the adsorption capacity of heavy metals in microplastics.

关键词： Study on Adsorption of Heavy Metals Cu and Zn by Microplastics Under Different Aged Factors

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Seismic Target Drifts for Underground Railway Stations. Cases of Traditional Rigid Connections and Sliding Interior Columns

SSRN

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SSRN 2023年

作者： Bu, Xiangbo Xu, Zigang Ledesma, Alberto López-Almansa, Francesc Civil and Environmental Engineering Department Barcelona Spain Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering East China Jiaotong University Nanchang China Architecture Technology Department Barcelona Spain

In this study, the seismic performances of underground structures with either transverse traditional rigid layout or sliding interior columns are numerically evaluated by pushover analyses;both the horizontal and vertical components of the seismic ground motion are taken into account. Thirty-one representative actual subway stations featured with various structural forms, soil types, and burial depths are analyzed in this study;although each of these stations has rigid connections between all their structural members, alternative solutions with sliding interior columns are also designed. The seismic performance of each station (with rigid connections and sliding columns) is evaluated in the framework of the Performance-Based Design by considering four Target Drifts: Normal Operational, Immediate Operational, Reparable Operational and Irreparable. The corresponding drift thresholds are determined for each individual station, then global average values for the two considered cases (traditional rigid layout and sliding columns) are proposed. The rationality of the proposed seismic performance quantification system is verified by comparison with observed damage (Daikai station, traditional rigid solution) and experimental results (shaking table test of reduced scale station model with sliding columns). © 2023, The Authors. All rights reserved.

关键词： Underground structures

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