Mechanism Analysis and Criterion for Avoiding Risk of Karst Water Burst Flood Illustrated in Maluqing Tunnel

2011 ◽  
Vol 250-253 ◽  
pp. 2650-2661 ◽  
Author(s):  
Ming Huang ◽  
Xu Dong Zhang ◽  
Mao Kun Xu ◽  
Li Qin Cai
Keyword(s):  
Statistical Analysis ◽  
Large Scale ◽  
Daily Rainfall ◽  
Bed Load ◽  
Hydraulic Pressure ◽  
Karst Water ◽  
Mechanism Analysis ◽  
Karst Cavity ◽  
Mechanics Characteristic ◽  
Statistical Analysis Method

With 19 groups of data associated with inrush or bursting water from karst cavity, obtained from Yichang-Wanxian Railway Maluqing Tunnel field test, conceptual models of Karst Water Burst Flood (KWBF) was brought forward by statistical analysis and phenomenological induction. KWBF is super-large amount of artesian water together with mud, which statically deposited in karst cavity, suddenly released into tunnel. KWBF has 3 kinds of characteristic: large scale of cavity water, high hydraulic pressure, high bed load content, dynamic supply of ground water, strong destroyed power; no foreboding, paroxysmal and intermittence, antinomy between paroxysmal and arrearage; force majeure, difficulty forecast, etc. Forecasting of Karst Water Burst Flood is conducted with rainfall seeping theory and statistical analysis method, while the base data are obtained from field quantity observation technical such as rainfall, hydrograph measure. Because of pressure dispersion between inside and outside of the cavity, seepage enlarge is evolved into conflux so that deprive groundwater from aquifer aqueduct and fracture, so, the water together with mud release suddenly from karst into tunnel. The key effect factor on KWBF is water count and silted or filling degree of conflux aqueduct. It is the essential numerical criterion that the daily rainfall must be less than 20mm if construction in the tunnel after the karst cavity has been broken through. To evade risk during construction temporary stage and permanent working stage, measure of energy releasing and pressure reducing (ERPR) must be accept. In addition, it was suggested that the key parameter of risk control for karst tunnel is water count and its cumulating velocity, mechanics characteristic of bed load filling in the conflux aqueduct.

scholarly journals Statistics and Formation Mechanism Analysis on the Basin-Range Patterns of Granite Bodies in Hunan Province, China

2021 ◽  
Author(s):  
Runchu Wei ◽  
Chenmo Rao ◽  
Zhendong Cao ◽  
Hui Zhou ◽  
Yi Zhu ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Carbonate Rocks ◽  
Large Scale ◽  
Hunan Province ◽  
Mechanism Analysis ◽  
Essential Factor ◽  
High Solubility ◽  
Tectonic Framework ◽  
The Difference ◽  
Tectonic Movements

Abstract This paper presents the results of statistical analysis on the basin-range relations between the granite rock bodies and surrounding rocks in Hunan Province of China. Among the 44 granitoids in Hunan Province, 28 are basins, 14 are ranges, and only 2 cannot be directly classified. The basin-range properties of granite bodies are closely related to the lithology of surrounding rocks. Among the 28 granite basins, 24 are surrounded by slate, 3 by sandstone, and only 1 by glutenite, while 11 of 14 ranges are surrounded by carbonate rocks. From the perspective of endodynamic process, tectonic movements played an important role in the evolution of the terrain in the granite areas. Firstly, tectonism shaped the large-scale tectonic framework which deter-mined the distribution of some granite mountains in Hunan Province. In addition, tectonic compression or extension formed some granite compressional uplifts or horsts, which present as ranges now. From the perspective of differential weathering, the difference of resistance to weathering between granite and their surrounding rocks is an essential factor for the development of granite basin or range. When their surrounding rocks are carbonate rocks, the granite areas mostly present as ranges for the high solubility of carbonate minerals. When their surrounding rocks are slate rocks, the granite areas are mostly basins for their lower resistance to weathering than slate rocks determined by their more unstable minerals to weathering and more conductive soils to rainfall infiltration.

Technical solutions envisaged in managing solids in combined sewer networks

1996 ◽  
Vol 33 (9) ◽  
pp. 237-244 ◽  
Author(s):  
Ghassan Chebbo ◽  
Dominique Laplace ◽  
André Bachoc ◽  
Yves Sanchez ◽  
Benoit Le Guennec
Keyword(s):  
Large Scale ◽  
Suspended Solids ◽  
Drainage Area ◽  
Bed Load ◽  
Urban Drainage ◽  
Combined Sewer ◽  
Wet Weather ◽  
Technical Solutions ◽  
Dry Weather Flow ◽  
Sewer Networks

Solids in combined sewer networks represent two important technical questions: - the clogging of man-entry sewers, and - pollution in urban wet weather discharges, whose main vectors are generally suspended solids. In this paper, we shall present first, curative technical solutions which avoid or remove deposits in man-entry sewers. We shall discuss the partial extraction of the largest solids; selective trapping of bed load solids, which form deposits; and the displacement of deposits using dry weather flow flushing waves. We shall then examine technical solutions to control pollution in urban wet weather discharges. This will show that decantation is an efficient means of fighting pollution. However, it is not always feasible because it involves large scale investments. Complementary methods should, therefore, be developed and used at different points in the water's passage through an urban drainage area.

scholarly journals Financial Performance of Non-oil Manufacturing Companies Listed on the Libyan Stock Market (LSM): Mixed Methods Study

2019 ◽  
Vol 9 (4) ◽  
pp. 77
Author(s):  
Khalifa Mohamed Khalifa Omar
Keyword(s):  
Statistical Analysis ◽  
Stock Market ◽  
Financial Performance ◽  
Manufacturing Companies ◽  
Analysis Method ◽  
Affecting Factors ◽  
Structured Interviews ◽  
Turnover Ratio ◽  
Statistical Effect ◽  
Statistical Analysis Method

The major objective of this study is to assess the financial performance and identify the affecting factors in this performance of non-oil manufacturing companies from 1999 to 2008. The study sample consisted of all non-oil manufacturing companies' enlisted at Libyan stock market which count (8). The data collected was analyzed by using statistical analysis method such as descriptive statistics, correlation test, Multiple- regression, as well as semi-structured interviews method. The results regarding to the statistical analysis method (net working capital, inventory turnover ratio, selling and general administrative expenses ratio, and company size and company age), have a positive statistical effect on the financial performance(ROA), while the variables of (current ratio, quick ratio and account receivable turnover ratio), have a negative statistical effect on the financial performance (ROA). The results regarding to semi-structured interviews method, reveal that the respondents in the interviews were confirmed that the selected factors have a significant effect on financial performance (ROA). The researcher recommended that the selected companies must consider the listed decision on the Libyan stock market; even when their financial performance is good.

scholarly journals Variability of Prognostic Results Based on Biological Parameters in Sickle Cell Disease Cohort Studies in Children: What Should Clinicians Know?

Children ◽  
2021 ◽  
Vol 8 (2) ◽  
pp. 143
Author(s):  
Julie Sommet ◽  
Enora Le Roux ◽  
Bérengère Koehl ◽  
Zinedine Haouari ◽  
Damir Mohamed ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Sickle Cell Disease ◽  
Cohort Studies ◽  
Statistical Methods ◽  
Sickle Cell ◽  
Biological Parameters ◽  
Analysis Method ◽  
Cell Disease ◽  
Statistical Analysis Method

Background: Many pediatric studies describe the association between biological parameters (BP) and severity of sickle cell disease (SCD) using different methods to collect or to analyze BP. This article assesses the methods used for collection and subsequent statistical analysis of BP, and how these impact prognostic results in SCD children cohort studies. Methods: Firstly, we identified the collection and statistical methods used in published SCD cohort studies. Secondly, these methods were applied to our cohort of 375 SCD children, to evaluate the association of BP with cerebral vasculopathy (CV). Results: In 16 cohort studies, BP were collected either once or several times during follow-up. The identified methods in the statistical analysis were: (1) one baseline value per patient (2) last known value; (3) mean of all values; (4) modelling of all values in a two-stage approach. Applying these four different statistical methods to our cohort, the results and interpretation of the association between BP and CV were different depending on the method used. Conclusion: The BP prognostic value depends on the chosen statistical analysis method. Appropriate statistical analyses of prognostic factors in cohort studies should be considered and should enable valuable and reproducible conclusions.

scholarly journals Resonance mechanism analysis of large-scale photovoltaic power plant

2021 ◽  
Vol 7 (1) ◽  
pp. 47-54
Author(s):  
Jinjie Lin ◽  
Yong Li ◽  
Sijia Hu ◽  
Qianyi Liu ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Power Plant ◽  
Large Scale ◽  
Mechanism Analysis ◽  
Resonance Mechanism ◽  
Photovoltaic Power

scholarly journals Identification of Genes with Potential Roles in Apple Fruit Development and Biochemistry through Large-Scale Statistical Analysis of Expressed Sequence Tags

2006 ◽  
Vol 141 (3) ◽  
pp. 811-824 ◽  
Author(s):  
Sunchung Park ◽  
Nobuko Sugimoto ◽  
Matthew D. Larson ◽  
Randy Beaudry ◽  
Steven van Nocker
Keyword(s):  
Statistical Analysis ◽  
Fruit Development ◽  
Expressed Sequence Tags ◽  
Large Scale ◽  
Apple Fruit ◽  
Expressed Sequence
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