scholarly journals The Stability Analysis of Key Block at Excavation Surface with Probabilistic Approach.

1996 ◽  
pp. 89-98
Author(s):  
Yuzo Ohnishi ◽  
Hiroyuki Nishiyama
Keyword(s):  
Stability Analysis ◽  
Probabilistic Approach ◽  
Key Block ◽  
The Stability

scholarly journals Stability Analysis and Monitoring Method for the Key Block Structure of the Basic Roof of Noncoal Pillar Mining with Automatically Formed Gob-Side Entry

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Jianning Liu ◽  
Manchao He ◽  
Yajun Wang ◽  
Ruifeng Huang ◽  
Jun Yang ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Coal Mine ◽  
Block Structure ◽  
Monitoring Method ◽  
Roof Caving ◽  
Pillar Mining ◽  
Key Block ◽  
The Stability ◽  
Block Structures ◽  
Basic Roof

The key block of the basic roof is the main contributor to the structural stability of a roadway. Research on the stability of the key block structure is of great significance for the promotion of noncoal pillar mining with automatically formed gob-side entry (GEFANM) technology. This paper is set in the engineering context of the GEFANM experiment at the Ningtiaota Coal Mine. The study fully considered the differences in the gob roof caving on the roof-cutting-line side, and the range of rotation angles to maintain a stable key block was determined. Based on this range of rotation angles, the range of safe bulking coefficients of gangue was calculated. The bulking coefficient of the gangue on the gravel side of the roadway was used as the metric in a new monitoring method and in the calculation of the field parameters. The range of safe bulking coefficients was determined to be 1.40–1.37. Field monitoring was conducted to obtain the gangue bulking coefficient on the gravel side. Combining the roof and floor convergence data, when the bulking coefficient fell within the safe range, the convergence was 95–113 mm. In this stage, the key block structure was stable. When the gangue bulking coefficient fell outside the safe range, the convergence was larger, and cracks were observed. The key block may be vulnerable to instability. The results affirmed that the gangue bulking coefficient can be used as a monitoring metric to study the stability of key block structures.

scholarly journals Probabilistic analysis of flood embankment stability: the case study of the Adige River embankment in Italy

2020 ◽  
Vol 195 ◽  
pp. 01003
Author(s):  
Alessia Amabile ◽  
Fabio De Polo ◽  
Alessandro Tarantino
Keyword(s):  
Stability Analysis ◽  
Probabilistic Approach ◽  
Flood Hazards ◽  
Probabilistic Distribution ◽  
Worldwide Phenomenon ◽  
The Stability ◽  
River Embankment ◽  
Flood Defence ◽  
Embankment Stability

Flooding is a worldwide phenomenon. Over the last few decades the world has experienced a rising number of devastating flood events and the trend in such natural disasters is increasing. Furthermore, escalations in both the probability and magnitude of flood hazards are expected as a result of climate change. Flood defence embankments are one of the major flood defence measures and stability assessment for these structures is therefore a very important process. Traditional deterministic approaches to stability analysis do not allow taking into account and quantifying the uncertainties in soil characterisation. For this reason they may not be sufficient to capture the failure of flood embankments. The paper presents a probabilistic approach for the stability analysis of flood embankments taking into account the probabilistic distribution of soil hydro-mechanical properties. The approach is validated against the failure case study of the Adige river embankment in Italy, by comparing the probability of failure of two sections, within and outside the failure segment respectively.

scholarly journals STABILITY ANALYSIS OF OCEAN PIPELINES : A PROBABILISTIC APPROACH

1986 ◽  
Vol 1 (20) ◽  
pp. 139
Author(s):  
Leon C. Geustyn ◽  
Gideon De F. Retief
Keyword(s):  
Monte Carlo Simulation ◽  
Stability Analysis ◽  
Probabilistic Approach ◽  
Statistical Error ◽  
Lateral Stability ◽  
Deterministic Approach ◽  
Stochastic Nature ◽  
Simulation Techniques ◽  
Sea Bed ◽  
The Stability

A probabilistic approach to the lateral stability of a pipeline on the sea-bed is considered. The uncertainties involved in the deterministic approach, due to the stochastic nature of variables, inaccuracy of models and statistical error are discussed. Variables representing these uncertainties are identified and their statistical properties investigated. Procedures for computing the probability of stability failure are developed using both analytical and Monte Carlo simulation techniques. Example calculations are presented indicating typical applications. It is concluded that the probabilistic procedure, as presented here, can serve as a valuable tool in the stability analysis of ocean pipelines.

A PROBABILISTIC APPROACH TO THE STABILITY ANALYSIS OF REAL-TIME CONTROL SYSTEMS

2005 ◽  
Vol 38 (1) ◽  
pp. 25-30 ◽  
Author(s):  
Manel Velasco ◽  
Pau Martí ◽  
Ricard Villà ◽  
Josep M. Fuertes ◽  
Jordi Ayza ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Control Systems ◽  
Real Time ◽  
Probabilistic Approach ◽  
Real Time Control ◽  
Time Control ◽  
The Stability

Stability Analysis of the Nanjung Water Diversion Twin Tunnels based on Convergence Measurement

2019 ◽  
Vol 1 (1) ◽  
pp. 49-60
Author(s):  
Simon Heru Prassetyo ◽  
Ganda Marihot Simangunsong ◽  
Ridho Kresna Wattimena ◽  
Made Astawa Rai ◽  
Irwandy Arif ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Convergence Rate ◽  
Critical Strain ◽  
Convergence Rates ◽  
Strain Analysis ◽  
Water Diversion ◽  
Tunnel Face ◽  
Tunnel Stability ◽  
The Stability ◽  
Twin Tunnels

This paper focuses on the stability analysis of the Nanjung Water Diversion Twin Tunnels using convergence measurement. The Nanjung Tunnel is horseshoe-shaped in cross-section, 10.2 m x 9.2 m in dimension, and 230 m in length. The location of the tunnel is in Curug Jompong, Margaasih Subdistrict, Bandung. Convergence monitoring was done for 144 days between February 18 and July 11, 2019. The results of the convergence measurement were recorded and plotted into the curves of convergence vs. day and convergence vs. distance from tunnel face. From these plots, the continuity of the convergence and the convergence rate in the tunnel roof and wall were then analyzed. The convergence rates from each tunnel were also compared to empirical values to determine the level of tunnel stability. In general, the trend of convergence rate shows that the Nanjung Tunnel is stable without any indication of instability. Although there was a spike in the convergence rate at several STA in the measured span, that spike was not replicated by the convergence rate in the other measured spans and it was not continuous. The stability of the Nanjung Tunnel is also confirmed from the critical strain analysis, in which most of the STA measured have strain magnitudes located below the critical strain line and are less than 1%.

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