scholarly journals Real-time monitoring and FEMLIP simulation of a rainfall-induced rockslide

2019 ◽  
Vol 19 (1) ◽  
pp. 153-168 ◽  
Author(s):  
Zhaohua Li ◽  
Zhigang Tao ◽  
Yuanjun Jiang ◽  
Qian Lv ◽  
Felix Darve ◽  
...  
Keyword(s):  
Real Time ◽  
Rock Slope ◽  
Water Infiltration ◽  
Liaoning Province ◽  
Open Pit ◽  
Real Time Monitoring ◽  
Weak Zone ◽  
Prediction And Prevention ◽  
Geological Discontinuity ◽  
The Stability

Abstract. Rockslides are a common and devastating problem affecting mining and other engineering activities all over the world; consequently, there have been many studies into their prediction and prevention. This study focused on a recent rockslide in an open-pit mine in Liaoning Province, China. The stability of the rock slope under excavation and rainfall conditions was monitored using an efficient real-time monitoring system. A further numerical analysis was performed using the finite element method with Lagrangian integration points (FEMLIP), and two forms of the normalized global second-order work were calculated to analyze the stability of the rock slope. In fact for the future it would be very interesting to compare measurements and simulations in real time, and not only to develop back computations after failure. The numerical results indicate that the rock slope remained stable during excavation, yet lost stability after subsequent rainfall. Water infiltration, along with a major geological discontinuity, degraded the strength of the weak zone and induced the rockslide. The monitoring approach presented its robustness and generality, and was worth being generalized. The numerical approach proposed the evolution of the safety factor, the monitoring data were compared, and the mechanism of the rockslide was determined. It could be used as an assistant tool for disaster prediction.

scholarly journals Real-time monitoring and FEMLIP simulation of a rainfall-induced rockslide

2018 ◽  
Author(s):  
Zhaohua Li ◽  
Zhigang Tao ◽  
Yuanjun Jiang ◽  
Qian Lv ◽  
Felix Darve ◽  
...  
Keyword(s):  
Real Time ◽  
Safety Factor ◽  
Rock Slope ◽  
Water Infiltration ◽  
Liaoning Province ◽  
Open Pit ◽  
Real Time Monitoring ◽  
Weak Zone ◽  
Prediction And Prevention ◽  
Geological Discontinuity

Abstract. Rockslides are a common and devastating problem affecting mining and other engineering activities all over the world; consequently, there have been many studies into their prediction and prevention. This study focused on a recent rockslide in an open pit mine in Liaoning province, China. The stability of the rock slope under excavation and rainfall conditions was monitored using an efficient real-time monitoring system. A further numerical analysis was performed using the Finite Element Method with Lagrangian Integration Points (FEMLIP), and the normalized global second order work was implanted to assess the structure instability as a safety factor. In fact for the future it would be very interesting to compare in real time measurements and simulations, and not only to develop back computations after failure. The numerical results indicate that the rock slope remained stable during excavation, yet lost stability after subsequent rainfall. Water infiltration, along with a major geological discontinuity, degraded the strength of the weak zone and induced the rockslide. The monitoring approach presented its robustness and generality, and was worth being generalized. The numerical approach proposed the evolution of the safety factor, comparing the monitoring data, and the mechanism of the rockslide was determined. It could be used as an assistant tool for the disaster predictions.

A Self-Powered Intelligent Tactile Electric Skin Based on ZnO/Fabrics for Real-Time Monitoring Grabbing of Snowboard

2020 ◽  
Vol 15 (2) ◽  
pp. 179-183
Author(s):  
Rongxin Guan ◽  
Ziqi Wang ◽  
Xinchao Gao ◽  
Mailun Shen ◽  
Xihong Wang ◽  
...  
Keyword(s):  
Real Time ◽  
Power Source ◽  
Scientific Basis ◽  
Real Time Monitoring ◽  
Textile Fabrics ◽  
External Power Source ◽  
External Power ◽  
Self Powered ◽  
The Stability ◽  
Contact Position

Real-time monitoring of the position and duration of the snowboarder's grab in the air plays an very important role in scientifically improving the stability and innovation of the movement. Meanwhile, it also provides accurate scientific basis and judgment for the judges to identify the movement in the competition. By using four-needle ZnO nanowires combined with ordinary textile fabrics, a flexible device that can be attached to skis has been created. The device could output piezoelectric signals (working without external power source) served as both power source and sensing signal. Based on this, a snowboard has been modified to monitor the contact position and duration, when any touch or grab occurs on the snowboard. Undeniably, this work has created a new and more scientific monitoring system for snowboarding competitions and training. In addition, it's provide a viable method to promote the directions of sport competitions and equipment with constantly updating portable equipment.

scholarly journals Rapid assessment of the stability of DNA duplexes by impedimetric real-time monitoring of chemically induced denaturation

Lab on a Chip ◽  
2011 ◽  
Vol 11 (9) ◽  
pp. 1656 ◽  
Author(s):  
B. van Grinsven ◽  
N. Vanden Bon ◽  
L. Grieten ◽  
M. Murib ◽  
S. D. Janssens ◽  
...  
Keyword(s):  
Real Time ◽  
Rapid Assessment ◽  
Dna Duplexes ◽  
Real Time Monitoring ◽  
Chemically Induced ◽  
The Stability

scholarly journals The DCMT in Progress

1993 ◽  
Vol 156 ◽  
pp. 79-83
Author(s):  
Li Zhigang
Keyword(s):  
Real Time ◽  
Astronomical Observatory ◽  
Meridian Circle ◽  
Horizontal Meridian ◽  
Real Time Monitoring ◽  
Set Up ◽  
The Stability ◽  
Astronomical Instrument

The DCMT (Danish-Chinese Meridian Telescope) is jointly developed by the Shaanxi Astronomical Observatory, Nanjing Astronomical Instrument Factory and Copenhagen University Observatory. The instrument was set up at the Shaanxi Astronomical Observatory in 1990 and put in testing operation in the same year. The design of this horizontal meridian circle is very compact and allows direct real-time monitoring of the instrument parameters. We have studied the stability of the instrument and internal refraction in the telescope tube.

scholarly journals Study on the Influence of Rainfall Infiltration on the High rock Slope of Open-pit Mine Stability using a New Nonlinear Strength Reduction Method

2021 ◽  
Author(s):  
Tianbai Zhou ◽  
Lingfan Zhang ◽  
Jian Cheng ◽  
Jianming Wang ◽  
Xiaoyu Zhang ◽  
...  
Keyword(s):  
Rock Mass ◽  
Rock Slope ◽  
Reduction Method ◽  
Strength Reduction ◽  
Open Pit Mine ◽  
Open Pit ◽  
Strength Reduction Method ◽  
Rock Slopes ◽  
High Rock Slope ◽  
The Stability

Abstract Due to long-term mining, a series of high and steep rock slopes have been formed in the open-pit mine. For high rock slopes, rainfall infiltration is the main cause of landslide. Therefore, the stability analysis of high rock slope under rainfall has become a key issue in the open-pit mine engineering. In this work, aiming at the high stress condition of high rock slope, the instantaneous internal friction angle and instantaneous cohesion of rock mass under different stress states are deduced, and the a nonlinear strength reduction method for high rock slope is established according to the relationship between normal stress and shear stress of rock mass under the Hoke-Brown criterion. The numerical calculation results show that the factor of safety (FOS) for high rock slope calculated by the proposed method is more reasonable. Taking the southwest slope of Dagushan Iron Mine as the research background, the safety factors of high rock slope under different rainfall conditions are calculated by COMSOL Multiphysics. And the stability analysis of high rock slope in open-pit mine under rainfall are carried out.

scholarly journals Remote Real Time Monitoring System of Slope and Its Application in Sustainable Mining of Open Pit Coal Mine

2021 ◽  
Vol 1974 (1) ◽  
pp. 012008
Author(s):  
Dinggui Hou ◽  
Xinyue Song ◽  
Sifan Li ◽  
Chenmei Lu ◽  
Kelin Ma ◽  
...  
Keyword(s):  
Real Time ◽  
Monitoring System ◽  
Coal Mine ◽  
Open Pit ◽  
Real Time Monitoring ◽  
Sustainable Mining

The Design of Data Acquisition Storage and Real-Time Monitoring System Based on FPGA

2011 ◽  
Vol 341-342 ◽  
pp. 803-806
Author(s):  
Su Hua Liu ◽  
San Min Shen ◽  
Yong Ye ◽  
Ji Jun Xiong
Keyword(s):  
Data Acquisition ◽  
Real Time ◽  
Digital Signal ◽  
Test System ◽  
Real Time Monitoring ◽  
Collection System ◽  
The Real ◽  
Overall Design ◽  
The Stability ◽  
And Storage

In the test system, all kinds of signals need to be processed. In order to meet the need of test system,we propose a kind of method of overall design of the real-time monitoring and storage of analog signal and digital signal. And we descript that how the data is sent to PC to real-time monitor and how we read out the data of the storage, and at the same time, the effect of the real-time monitoring is mentioned. After the application of the practice, the stability and the reliability of the collection system get confirmed.

scholarly journals GNSS/CORS-Based Technology for Real-Time Monitoring of Landslides on Waste Dump – A Case Study at the Deo Nai South Dump, Vietnam

2020 ◽  
Vol 1 (2) ◽  
Author(s):  
Pham Cong Khai ◽  
Dinh Trong TRAN ◽  
Van Hai NGUYEN
Keyword(s):  
Real Time ◽  
Monitoring System ◽  
Human Life ◽  
Processing System ◽  
Warning System ◽  
Open Pit ◽  
Waste Dump ◽  
Real Time Monitoring ◽  
Monitoring Stations

Nowadays, there are many different methods for monitoring waste dump landslides based on GPS, total station, remote sensing, UAV, Lidar, etc. However, these technologies can only periodically monitor but cannot continuously monitor in real time. In recent years, GNSS CORS technology has been applied to continuously monitor real time waste dump landslides in open-pit mines to provide immediate or nearly-instant warning of waste dump landslides, which can timely prevent and minimize damages to property and human life. In the present work, the real time monitoring system of waste dump landslides monitoring based on GNSS CORS technology was designed and built. This real time monitoring system includes (1) the GNSS CORS station based on Leica technology, (2) the monitoring stations system, (3) the data collection, transmission and processing system based on Trimble technology and the warning system. This system allows continuous monitoring in real time and provides an instant warning if the landslide occurred. Moreover, it also has the advantage of being cheap, flexible and easy to install for monitoring stations. A simulation experiment results showed that our monitoring system operates stably and continuously 24/7 with a horizontal accuracy of ±3 mm and vertical accuracy of ±5 mm.

scholarly journals Infrared Temperature Law and Deformation Monitoring of Layered Bedding Rock Slope under Static Load

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Zhigang Tao ◽  
Kuiming Liu ◽  
Xuebin Cui ◽  
Xiaobing Qiao ◽  
Xiaoming Sun
Keyword(s):  
Large Scale ◽  
Rock Slope ◽  
Test System ◽  
Deformation Monitoring ◽  
Open Pit ◽  
Ratio Test ◽  
Layered Rock ◽  
Monitoring Process ◽  
The Stability ◽  
Bedded Rock

China is a mountainous and hilly country with frequent large-scale landslides with complicated mechanisms and serious damage. The layered rock slopes have the worst stability, undergo the most serious damage, and have been rarely investigated due to limitations of measurement methods and instruments. Taking the Nanfen open-pit iron mine as an example, a physical large-model similarity ratio test system is used to simulate the landslide remote monitoring process. The development of the sliding surface, stress-strain characteristics, and infrared law of the bedded rock slope are analyzed. Results show that the anchor cable with constant resistance and large deformation plays a significant role in the stability of the slope, and its maximum slip force is 420 N and 630 N, respectively. Slip and crack are the main mechanisms of energy release in layered rock slope. Some scheme improvement measures for this kind of test are put forward, which provides basis and optimization scheme for the subsequent study of layered rock slope.

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