scholarly journals Rockburst Inducement Mechanism and Its Prediction Based on Microseismic Monitoring

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Yongsong Li ◽  
Chao Zhou
Keyword(s):  
Potential Risk ◽  
Progressive Failure ◽  
Microseismic Monitoring ◽  
Underground Engineering ◽  
Underground Powerhouse ◽  
Engineering Construction ◽  
Whole Process ◽  
Underground Caverns ◽  
Risk Areas ◽  
Pumped Storage

The rockburst disaster in the hard rock caused by excavation and unloading of deep underground caverns threatens the safety of engineering construction. In recent years, the microseismic monitoring technology, which can dynamically monitor the whole process of progressive failure of rock mass in real time, has been widely used in rockburst monitoring and early warning of underground engineering. In view of the slight rockburst in local surrounding rock during the excavation of underground powerhouse of Huanggou Pumped Storage Power Station, a rockburst microseismic monitoring system is constructed. And through the analysis of the temporal and spatial activity of microseisms during the monitoring period, the potential risk areas of rockbursts are identified and delineated. The monitoring results show that the microseismic system can effectively capture the blasting and microseismic signals during construction. The microseismic activity is closely related to the intensity of field blasting disturbance. The potential risk areas of rockburst are the upstream side arch shoulder and the intersection between lower drainage corridor and workshop installation room. The research results can provide technical support for later excavation and support of underground powerhouse caverns of Huanggou Hydropower Station.

scholarly journals Microseismic Monitoring, Positioning Principle, and Sensor Layout Strategy of Rock Mass Engineering

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-20
Author(s):  
Tianhui Ma ◽  
Daoyuan Lin ◽  
Chun’an Tang ◽  
Kedar Prasad Yadav ◽  
Zhiqiang Feng ◽  
...  
Keyword(s):  
Rock Mass ◽  
Progressive Failure ◽  
Failure Process ◽  
Microseismic Monitoring ◽  
Underground Engineering ◽  
Monitoring Technology ◽  
Sensor Arrangement ◽  
Initial Stage ◽  
Practical Engineering ◽  
Scientific Nature

Microseismic monitoring technology can start from the most initial stage of rock deformation and track and monitor the progressive failure process of rock mass from the fracture of rock blocks to the instability of rock mass. Thus, the scientific nature of monitoring work is greatly promoted, and the accuracy and advance of the prediction of engineering and geological disasters are improved. In this paper, the fracture and instability of rock can be analyzed by analyzing the microseismic signals produced by rock failure; The location of microseismic source can be determined by multipoint synchronous data acquisition to determine the time when each sensor (at least 5) receives microseismic signals; Combined with practical engineering experience for underground engineering in growth, heading tunnel, put forward only sensor arrangement to take mobile, follow the semienclosed layout network. We hope to give some reference to the researchers who are concerned with microseismic monitoring technology.

scholarly journals Stability Evaluation on Surrounding Rocks of Underground Powerhouse Based on Microseismic Monitoring

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Feng Dai ◽  
Biao Li ◽  
Nuwen Xu ◽  
Yongguo Zhu ◽  
Peiwei Xiao
Keyword(s):  
Rock Mass ◽  
Microseismic Monitoring ◽  
Surrounding Rock ◽  
Underground Powerhouse ◽  
Multiple Faults ◽  
Routine Monitoring ◽  
Underground Caverns ◽  
Macroscopic Deformation ◽  
Microseismic Events ◽  
The Stability

To study the stability of underground powerhouse at Houziyan hydropower station during excavation, a microseismic monitoring system is adopted. Based on the space-time distribution characteristics of microseismic events during excavation of the main powerhouse, the correlation between microseismic events and blasting construction is established; and the microseismic clustering areas of the underground powerhouse are identified and delineated. The FLAC3D code is used to simulate the deformation of main powerhouse. The simulated deformation characteristics are consistent with that recorded by microseismic monitoring. Finally, the correlation between the macroscopic deformation of surrounding rock mass and microseismic activities is also revealed. The results show that multiple faults between 1# and 3# bus tunnels are activated during excavation of floors V and VI of the main powerhouse. The comprehensive method combining microseismic monitoring with numerical simulation as well as routine monitoring can provide an effective way to evaluate the surrounding rock mass stability of underground caverns.

scholarly journals Research on the slope support technology in civil engineering construction

2021 ◽  
Vol 233 ◽  
pp. 03012
Author(s):  
Liu Lina ◽  
Han Wei
Keyword(s):  
Civil Engineering ◽  
Construction Process ◽  
Construction Engineering ◽  
Engineering Construction ◽  
Whole Process ◽  
Treatment Techniques ◽  
Technical Personnel ◽  
Foundation Structure ◽  
Technical Measures ◽  
Support Treatment

For the whole process of civil engineering construction, slope support technology is a very key technical point of civil construction. Engineering and technical personnel shall be able to fully ensure the safety and firmness of the foundation structure of the engineering slope by setting up retaining walls or using other slope support treatment techniques, and extend the safe service life of civil engineering. Under this premise, engineering and technical personnel must integrate the technical measures of slope support into the construction process of civil engineering.

scholarly journals Automatic Monitoring System in Underground Engineering Construction: Review and Prospect

2020 ◽  
Vol 2020 ◽  
pp. 1-16 ◽  
Author(s):  
Lixin Wang ◽  
Shuoshuo Xu ◽  
Junling Qiu ◽  
Ke Wang ◽  
Enlin Ma ◽  
...  
Keyword(s):  
Monitoring System ◽  
New Technology ◽  
Automatic Monitoring ◽  
Future Research ◽  
Underground Engineering ◽  
Automatic Monitoring System ◽  
Engineering Construction ◽  
Intelligent Technology ◽  
Time Acquisition ◽  
Engineering Monitoring

Automatic monitoring system is one of the main means to ensure the safety of underground engineering construction. This paper summarizes the current international research and application status of the underground engineering monitoring system from three aspects of data acquisition, data transmission, and data processing and emphatically introduces the mainstream new technology of the monitoring system. Furthermore, this paper puts forward specific and implementable technical routes based on the current intelligent technology and the challenges faced by future monitoring, which can provide direction and reference for future research, including high-precision real-time acquisition and safe and reliable transmission of monitoring data, multisource data fusion, and the visual intelligent early warning platform.

Study on the Information Processing Technology of Deformation Monitoring Data in the Underground Engineering

2013 ◽  
Vol 353-356 ◽  
pp. 1555-1558
Author(s):  
Ke Wu ◽  
Ke Zhang ◽  
Cheng Jun Wang ◽  
Chuang Zhao
Keyword(s):  
Data Processing ◽  
Measurement Data ◽  
Processing System ◽  
Deformation Monitoring ◽  
Surrounding Rock ◽  
Monitoring Data ◽  
Dynamic Monitoring ◽  
Information Control ◽  
Underground Engineering ◽  
Engineering Construction

The deformation monitoring of surrounding rock and data processing in tunnel is the foundation and safety technical support of underground engineering information control and management. However, due to the special environment in the underground engineering construction, acquiring the deformation information of surrounding rock accurately and fast to assess the stability of surrounding rock is becoming one of the bottleneck problems for underground construction project information to be solved. According to the underground engineering projects, Based on the dynamic monitoring data processing and analysis, a set of underground engineering construction monitoring measurement data processing system is established, which can meet the acquisition of the monitoring measurement data, the arrangement of the measured data, data analysis and feedback, the monitoring data regression analysis.

scholarly journals Potential Risk Areas of Aedes albopictus in South-Eastern Iran: A Vector of Dengue Fever, Zika, and Chikungunya

2017 ◽  
Vol 8 ◽  
Author(s):  
Jalil Nejati ◽  
Rubén Bueno-Marí ◽  
Francisco Collantes ◽  
Ahmad A. Hanafi-Bojd ◽  
Hassan Vatandoost ◽  
...  
Keyword(s):  
Dengue Fever ◽  
Aedes Albopictus ◽  
Potential Risk ◽  
South Eastern ◽  
Eastern Iran ◽  
Risk Areas

scholarly journals Modelling of Time-Dependent Wellbore Collapse in Hard Brittle Shale Formation under Underbalanced Drilling Condition

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-21
Author(s):  
Shanpo Jia ◽  
Zhiqiang Xiao ◽  
Bisheng Wu ◽  
Caoxuan Wen ◽  
Lufeng Jia
Keyword(s):  
Immersion Time ◽  
Progressive Failure ◽  
Drilling Fluid ◽  
Progressive Collapse ◽  
Failure Process ◽  
Chemical Properties ◽  
Whole Process ◽  
Drilling Condition ◽  
Shale Formation ◽  
Physical And Chemical

In recent years, the lithologic traps in a mid-depth formation are the focus of oil or gas exploration and development for eastern oilfields in China. The Shahejie Formation develops thick hard brittle shale, and the wellbore instability problem is prominent due to obvious hydration effect for long immersion time during drilling. Through the analysis of laboratory tests and field test results of physical and chemical properties and microstructure and mechanical properties of hard brittle shale, the instability mechanism is discussed for the wellbore in the shale formation. To simulate the whole process of progressive collapse of a wellbore in a hard brittle shale formation, a coupled hydraulic-mechanical-chemical (HMC) model is developed and this model is compiled with ABAQUS software as the solver. Then the coupled HMC model is applied to simulate the progressive evolution process of wellbore collapse in a hard brittle shale formation, and the influence of different parameters on the progressive failure of the wellbore is analysed. The results show that the wellbore enlargement rate increases with the drilling fluid immersion time and the influence of different parameters on the wellbore enlargement rate is different. The water absorption diffusion coefficient and the activity of the drilling fluid have the most obvious influence on the expansion of the wellbore, and the sensitivity is strong. The permeability of shale has little effect on the wellbore enlargement rate. The calculated progressive failure process of the wellbore is basically consistent with that of the actual drilling.

scholarly journals Excavation Method of Reducing Blasting Vibration in Complicated Geological Conditions

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Lixiang Xie ◽  
Wenbo Lu ◽  
Jincai Gu ◽  
Gaohui Wang
Keyword(s):  
Back Analysis ◽  
Blasting Vibration ◽  
Underground Engineering ◽  
Engineering Construction ◽  
Vibration Data ◽  
Geological Conditions ◽  
Blasting Excavation ◽  
The Stability ◽  
Site Test ◽  
Blasting Method

Drilling and blasting method as a common excavation method is widely used in the underground engineering construction. However, in the complicated geological conditions, the path of blasting excavation available has limitation, and then the larger blasting vibration is produced, which influence the stability and safety of the protected structure. To effectively reduce the blasting vibration by optimizing the blasting excavation method, firstly, the site test on blasting vibration is conducted to obtain the blasting vibration data; secondly, the LS-DYNA software is applied to simulate the vibration generated by blasting in site test, based on back analysis on the blasting vibration, the mechanical parameters of the rock mass are obtained, and they are used to simulate six different types of blasting excavation method. According to the analysis on them, the reasonable blasting excavation method is proposed to reduce the blasting vibration which can satisfy the blasting safety regulation.

Should Electronic Faucets Be Recommended in Hospitals?

2004 ◽  
Vol 25 (11) ◽  
pp. 997-1000 ◽  
Author(s):  
Iris F. Chaberny ◽  
Petra Gastmeier
Keyword(s):  
Pseudomonas Aeruginosa ◽  
High Risk ◽  
Nosocomial Infection ◽  
Potential Risk ◽  
Risk Areas

AbstractMicrobiological examinations of electronic faucets newly installed in a hospital kitchen revealed high bacteria counts andPseudomonas aeruginosaduring a 6-month period of observation. Our data suggest that the use of electronic faucets poses a potential risk for nosocomial infection in high-risk areas of hospitals.

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