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Micro-seismic signal propagation of low attenuation

Xiao Jian,Sun Shuting,Liu Jianzhong

Strategic Study of CAE 2014, Volume 16, Issue 8, Pages 83-87

Abstract:

This article explored the possibility of spread of weak seismic signalsThe results showed that both underground seismic signal propagation medium showed a degree of elasticityThis feature ensures that on the ground，and even the loess coverage area of micro seismic signal detected

Keywords： micro-seismic low attenuation inelastic attenuation

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Application of Underground Fracture Connection Monitoring in Anpeng Alkali Mine

Qi Tiexin,Liu Jianzhong,Qi Guilin,Dong Feng

Strategic Study of CAE 2006, Volume 8, Issue 7, Pages 63-67

Abstract:

In this paper, the theories, techniques, methodologies, and results of monitoring primary fracturesconnecting to the injection well in Anpeng Alkali Mine are presented, which combines micro-seismic monitoring

Keywords： Anpeng Alkali Mine wet process for alkali extraction underground fracture connection leveling survey micro-seismicmonitoring

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Features of seismic hazard in large dam projects and strong motion monitoring of large dams

Martin WIELAND,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 1, Pages 56-64 doi: 10.1007/s11709-010-0005-6

Abstract: Earthquakes can affect large dam projects in many different ways. Usually, design engineers are focussing on ground shaking and neglect the other aspects. The May 12, 2008 Wenchuan earthquake has damaged 1803 dams and reservoirs, and 403 hydropower plants with an installed capacity of 3.3GW. Among these dams were the 132-m-high Shapai RCC arch dam and the 156-m-high Zipingpu concrete face rockfill dam. These recently completed dams are dam types which, up to now, have not experienced strong ground shaking. The widespread mass movements have caused substantial damage to dams and surface powerhouses in Sichuan. The different features of earthquake hazard are presented, i.e., ground shaking, faulting and mass movements. It is proposed to prepare project-specific safety plans for all dams, which consist of a matrix where the possible hazards and the corresponding countermeasures are listed. The earthquake behaviors of the Sefid Rud, Zipingpu and Shapai dams, which, in the past, have experienced strong ground shaking from nearby earthquakes, are discussed. Finally, the need for strong motion instrumentation of large dams is discussed. It is proposed that major dams with large damage potential, dams located in areas of high seismicity, and dams showing signs of abnormal behavior be equipped with strong motion instruments.

Keywords： seismic hazard arch dam concrete face rockfill dam strong motion instrumentation reservoir-triggered

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Microseismic monitoring technology development direction and application

Liu Jianzhong,Tang Chunhua,Zuo Jianjun

Strategic Study of CAE 2013, Volume 15, Issue 10, Pages 54-58

Abstract:

This paper discussed the development direction of microseismic monitoringThe introduction of conventional seismic exploration theory can also increase the level of microseismicmonitoring, and form complete theory of microseismic.Above are important directions of microseismic monitoring technology development.With the development of technology, microseismic monitoring technology can also be used in seismic exploration

Keywords： microseismic monitoring seismic prospecting fracturing monitoring water monitoring

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Research of seismic events waveform in deep copper mine

Yang Zhiguo,Yu Runcang,Guo Ran

Strategic Study of CAE 2008, Volume 10, Issue 8, Pages 69-72

Abstract: better understand the regularities of rockburst occurrence,Dongguashan Copper Mine has installed an ISSI seismicmonitoring system, which can make a real-time monitoring of rock mass respond to mining.This paper briefly described the layout of the monitoring system in Dongguashan Copper Mine,then analyzedlocation has been improved greatly by the artificial processing, which will make the calculation of seismicAccording to the analysis results of a detecting blast and an identified seismic event,the waveform analysis

Keywords： deep mining rockburst seismic monitoring waveform analysis

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Research and Implementations of Structural Monitoring for Bridges and Buildings in Japan—A Review Review

Yozo Fujino, Dionysius M. Siringoringo, Yoshiki Ikeda, Tomonori Nagayama, Tsukasa Mizutani

Engineering 2019, Volume 5, Issue 6, Pages 1093-1119 doi: 10.1016/j.eng.2019.09.006

Abstract:

This paper provides a review on the development of structural monitoring in Japan, with an emphasison the type, strategy, and utilization of monitoring systems.Structural monitoring systems in Japan historically started with the objective of evaluating structuralIn the development of structural monitoring, monitoring systems and collected data were used to verify, the performance of seismic isolation systems in building and bridges, the verification of structural

Keywords： Structural monitoring Long-span bridge High-rise building Seismic monitoring Wind-induced responses Pavement and slab monitoring Structural control monitoring Structural assessment

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Flexible micro flow sensor for micro aerial vehicles

Rong ZHU, Ruiyi QUE, Peng LIU

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 4, Pages 539-545 doi: 10.1007/s11465-017-0427-0

Abstract:

This article summarizes our studies on micro flow sensors fabricated on a flexible polyimide circuitThe micro flow sensor has merits of flexibility, structural simplicity, easy integrability with circuitsIn our study, we install the fabricated micro flow sensors on micro aerial vehicles (MAVs) to detect

Keywords： micro flow sensor flexible sensor surface flow sensing aerodynamic parameter micro aerial vehicle (MAV

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Dependence of error sensitivity of frequency on bias voltage in force-balanced micro accelerometer

Lili CHEN, Wu ZHOU

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 2, Pages 146-149 doi: 10.1007/s11465-013-0260-z

Abstract:

To predict more precisely the frequency of force-balanced micro accelerometer with different biasBased on the theoretical results, micro accelerometer is fabricated and tested to study the influences

Keywords： Micro-Electro-Mechanical Systems (MEMS) micro accelerometer force-balanced micro accelerometer frequency

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Stress distribution in third subsidence belt

Yan Zhitao,Liu Jianzhong,Qiu Jinping,Jin Lihua

Strategic Study of CAE 2009, Volume 11, Issue 2, Pages 33-35

Abstract: subsidence belt is presented , with great amounts of data on hydraulic fracture orientation obtained from monitoringThe monitoring data implies that the tectonic stress direction in third subsidence belt is the combined

Keywords： hydraulic fracturing monitoring with micro- seismics third subsidence belt direction of maximumprinciple

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Effect of strata restraint on seismic performance of prefabricated sidewall joints in fabricated subway

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 5, Pages 763-779 doi: 10.1007/s11709-023-0917-6

Abstract: A new method to test the seismic performance of prefabricated specimens for underground assembled structuresIndices related to the seismic performance and damage modes are analyzed comprehensively to reveal theAdditionally, the strata restraint effect significantly affects the seismic performance and damage modeAn FE model that can be used to conduct a seismic performance study of prefabricated specimens for underground

Keywords： underground structures precast sidewall specimen seismic test method bearing capacity energy dissipation

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Numerical simulation of micro scale flowing and boiling

Wen WANG, Rui ZHUAN,

Frontiers in Energy 2009, Volume 3, Issue 4, Pages 396-401 doi: 10.1007/s11708-009-0049-2

Abstract: Numerical simulations of flowing and boiling in micro channels are presented, including the modelingThe simulated results also show the details of 3-dimensional heat transfer and the flow in micro channels, which are helpful to the investigation of the mechanism of two-phase heat transfer and flow in micro

Keywords： volume-of-fluid (VOF) micro channel nucleate boiling bubble dynamics simulation

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Effects of green roof damping and configuration on structural seismic response

Frontiers of Structural and Civil Engineering Pages 1133-1144 doi: 10.1007/s11709-023-0959-9

Abstract: To expand their usage, their inherent damping and layout sensitivity to seismic performance are investigated

Keywords： green infrastructure green roof structural resilience seismic design

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Dynamical research on spherical micro actuator with piezoelectric ceramic stacks drivers

ZHANG Ruihua, CHEN Haichu

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4, Pages 433-438 doi: 10.1007/s11465-007-0074-y

Abstract: This paper develops a 30 mm × 30 mm × 50 mm spherical micro actuator driven by piezoelectric ceramicwith a micro-gripper based on the sample spherical micro actuator, and the experimental research onthe micro assembly is conducted between a micro shaft of 180 μm and a micro spindle sleeve of 200 μm.the metal sphere and the friction block of the micro driving unit are analyzed.micro operation and assembly for micro electro mechanical systems (MEMS) or other microelements in micro

Keywords： spherical micro-gripper friction coefficient dynamic frequency

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Performance-based seismic assessment of a historical masonry arch bridge: Effect of pulse-like excitations

Frontiers of Structural and Civil Engineering Pages 855-869 doi: 10.1007/s11709-023-0972-z

Abstract: Seismic analysis of historical masonry bridges is important for authorities in all countries hostingFifteen seismic records were considered and categorized as far-field, pulse-like near-field, and non-pulse-like

Keywords： masonry arch bridges seismic behavior modal properties pulse-like records nonlinear time history

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Variability of waste copper slag concrete and its effect on the seismic safety of reinforced concrete

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 1, Pages 117-130 doi: 10.1007/s11709-021-0788-7

Abstract: In addition, the paper presents a reliability-based seismic risk assessment of a typical waste copperThe results show that waste copper slag can be safely used for seismic resistant structures as it results

Keywords： waste copper slag quantification of variability goodness-of-fit test seismic risk assessment PSDM