Theoretical model for the time prediction of landslides based on the monitoring data

2012 ◽  
pp. 415-419
Author(s):  
X Xu ◽  
H Yang
Keyword(s):  
Theoretical Model ◽  
Monitoring Data ◽  
Time Prediction

scholarly journals A Study on a Modified Model for the Hold Time of a Clean Extinguishing Agent

2021 ◽  
Vol 11 (21) ◽  
pp. 10312
Author(s):  
Goonho Kim ◽  
Jee-Hun Jeong ◽  
Hyun-Jeong Bang ◽  
Ho-Jun Lee
Keyword(s):  
Theoretical Model ◽  
Variable Exponent ◽  
Hold Time ◽  
Theoretical Equation ◽  
Integrity Test ◽  
Modified Model ◽  
Time Prediction ◽  
Maximum Improvement ◽  
Leakage Characteristics ◽  
Leakage Exponent

When estimating the theoretical hold time of a Clean Extinguishing Agent (CEA), the hold time is predicted using a leakage exponent and leakage characteristics that are measured through an Enclosure Integrity Test (EIT). In particular, the leakage exponent n is conventionally applied as 0.5, but recently, a variable exponent has been applied through measurement (approximately 0.48 to 0.85). When variable n is applied, the hold time varies greatly depending on the size of n. Therefore, in this study, a modified theoretical model for the hold time of a CEA is proposed to improve the accuracy of the hold time depending on the leakage exponent n. The modified theoretical model applies a different analysis of the inflow and outflow volumetric flow, and the results enable a more accurate hold time prediction. The modified theoretical equation shows an improvement of up to 8.6% for outflow volumetric flow V˙o and a maximum improvement of approximately 10.7% for hold time th.

Analysis of Frozen Drilling Surrounding Rock Temperature Field about Weakly Cemented Soft Rock

2011 ◽  
Vol 243-249 ◽  
pp. 2375-2381
Author(s):  
Wei Ming Wang ◽  
Lei Wang ◽  
Hai Bin Jia
Keyword(s):  
Temperature Field ◽  
Soft Rock ◽  
Freezing Temperature ◽  
Scientific Basis ◽  
Monitoring Data ◽  
Freezing And Thawing ◽  
Time Prediction ◽  
Rock Temperature ◽  
Temperature Diffusion ◽  
Two Phases

This paper mainly introduced the monitoring scheme of one mine’s wind well in Inner Mongolia. By analyzing the monitoring data at different depth, rules of the freezing temperature field were drawn. Fitting the monitoring data linearly at freezing and thawing phrase respectively, the experience formula of time prediction at the two phases were obtained. Meanwhile the temperature diffusion coefficient of sandstone and mudstone layers were revised, which can provide scientific basis for some similiar shaft construction.

scholarly journals A New Model for Real-Time Prediction of Wellbore Stability Considering Elastic and Strength Anisotropy of Bedding Formation

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 251
Author(s):  
Liqin Ding ◽  
Zhiqiao Wang ◽  
Jianguo Lv ◽  
Yu Wang ◽  
Baolin Liu
Keyword(s):  
Theoretical Model ◽  
Real Time ◽  
Field Data ◽  
In Situ Stress ◽  
Wellbore Stability ◽  
Real Field ◽  
Strength Anisotropy ◽  
Safety Control ◽  
Time Prediction

Severe wellbore stability issues were reported while drilling in laminated formation with weak planes such as beddings. To accurately determine the safe mud weight according to the changing environment is of primary importance for safety control of drilling. Considering both the elastic and strength anisotropy of bedding formation, a novel theoretical model is established and the stress and failure around wellbores are analyzed. The accuracy and applicability of the theoretical model is verified by in situ field data. For the purpose of fulfilling real-time prediction, the method flowchart of programming is also provided. The results show that the model built can be conveniently used to predict the stress distribution, failure area, and collapse and fracture pressure while drilling, and rather good predictions can be made compared to real field data. In addition, the inhomogeneity of in situ stress and elastic parameters affect the upper limit of the safe mud weight window (SMWW) greater than the lower limit. Negative SMWW may appear with the direction change of the wellbore or weak plane, especially when the azimuths of them change. As to the magnitude of SMWW, the anisotropic effects of Young’s modulus are greater than the Poisson’s ratio. The method established in this paper can greatly help with the precise prediction of wellbore stability as drilling proceeds in bedding formation.

A Model for Analyzing Suicide Prevention

Crisis ◽  
2000 ◽  
Vol 21 (2) ◽  
pp. 80-89 ◽  
Author(s):  
Maila Upanne
Keyword(s):  
Risk Factors ◽  
Theoretical Model ◽  
Protective Factors ◽  
Suicide Prevention ◽  
Suicide Risk ◽  
Practical Work ◽  
Individual Risk ◽  
Self Assessment ◽  
Prevention Project ◽  
Individual Risk Factors

This study monitored the evolution of psychologists' (n = 31) conceptions of suicide prevention over the 9-year course of the National Suicide Prevention Project in Finland and assessed the feasibility of the theoretical model for analyzing suicide prevention developed in earlier studies [ Upanne, 1999a , b ]. The study was formulated as a retrospective self-assessment where participants compared their earlier descriptions of suicide prevention with their current views. The changes in conceptions were analyzed and interpreted using both the model and the explanations given by the subjects themselves. The analysis proved the model to be a useful framework for revealing the essential features of prevention. The results showed that the freely-formulated ideas on prevention were more comprehensive than those evolved in practical work. Compared to the earlier findings, the conceptions among the group had shifted toward emphasizing a curative approach and the significance of individual risk factors. In particular, greater priority was focused on the acute suicide risk phase as a preventive target. Nonetheless, the overall structure of prevention ideology remained comprehensive and multifactorial, stressing multistage influencing. Promotive aims (protective factors) also remained part of the prevention paradigm. Practical working experiences enhanced the psychologists' sense of the difficulties of suicide prevention as well as their criticism and feeling of powerlessness.

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