scholarly journals The effect on river and earth dam caused by large height mining in underground coal mine - a case in Inner Mongolia

2020 ◽  
Vol 194 ◽  
pp. 04040
Author(s):  
Jianghua Li ◽  
Ling Li ◽  
Hui Xu
Keyword(s):  
Coal Mine ◽  
Inner Mongolia ◽  
Earth Dam ◽  
Maximum Height ◽  
Empirical Formulas ◽  
Hydraulic Connection ◽  
The Earth ◽  
Overburden Failure ◽  
Probability Integral Method ◽  
Jurassic System

Some coal seams located in the shallow area belong to Jurassic system strata in Inner Mongolia, China. There may be some effect on the rivers and earth dam on the earth surface of coal field after large height mining. Hydraulic connection was analyzed according to the hydrogeological condition and additional exploration results in Wotugou coal mine. Empirical formulas were used to predict overburden failure height after analyzing the strength type of overlying rocks. The deformation of earth dam was predicted through probability integral method under large height mining. The final research results include: (1) Quaternary system aquifer belongs to the type of weak to strong watery property and has an intimate hydraulic connection with the Youfang River. (2) The overlying rocks of 2-2 coal seam belong to medium hard type for the average uniaxial compressive strength of 25.52 MPa. The maximum height of fissure zone is 92.40 m, there was no effect on Youfang River after large height mining under the depth of 251.46 m. (3) The maximum surface subsidence reached 1.7 m and the horizontal deformation reached the allowable maximum value 4.0mm/m, there would be some effect on the earth dam, so some safety measures were put forward and needed to be done.

Porous-concrete pipe drainage of the earth dam of the Riga Hydroelectric Power Station

1974 ◽  
Vol 8 (10) ◽  
pp. 914-916
Author(s):  
I. S. Ronzhin ◽  
A. D. Osipov ◽  
V. Kh. Gol'tsman ◽  
A. B. Yumatov
Keyword(s):  
Earth Dam ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Power Station ◽  
Porous Concrete ◽  
The Earth ◽  
Concrete Pipe

Seepage through Earth Dams with Chimney Drain on Pervious Foundation

2012 ◽  
Vol 452-453 ◽  
pp. 538-542 ◽  
Author(s):  
Abdelkader Djehiche ◽  
Rekia Amieur ◽  
Mustafa Gafsi
Keyword(s):  
Experimental Study ◽  
Flow Rate ◽  
Drainage System ◽  
Earth Dam ◽  
Earth Dams ◽  
Drainage Systems ◽  
The Earth ◽  
Excess Water ◽  
Effective Drainage

This paper presents an experimental study of a homogenous earth dam. The work is focused to the search of solutions of problems encountered in the earth dams after their construction. One of the major problems is the choice and design of systems of drainage. The effective drainage system to prevent harmful accumulations of excess water is one of the most important roles of dams. Efficient drainage systems can improve the safety of earth dams. The paper presented herein reports the results obtained from the experimental study. Empiric relations have been obtained which can be help in the control of the flow rate in the chimney drain of the earth dams on pervious foundation, which can increase safety earth dams

The Effect of Faults on the Behaviour of the Earth Dam – Case Study of the Ourkiss Dam

2021 ◽  
Author(s):  
Hassiba Beghzim ◽  
Toufik Karech ◽  
Tayeb Bouzid
Keyword(s):  
Shear Stress ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Water Level ◽  
Difference Method ◽  
Earth Dam ◽  
The Earth ◽  
Base Displacement ◽  
Vertical Base

Abstract The analysis of the failure due to the effect of the propagation of normal and reversed faults with different angles of inclination and by sliding through the Ourkiss dam isstudied numerically. Mainly at the end of construction and at the highest water level, for this purpose the non-linear finite difference method is used considering four fault angles of inclination, activated at the center of the base of the embankment.The results of the study show that the shear stress values increase with the increase of the vertical base displacement imposed in both conditions of the dam state, and this for both normal and overturned faults.

scholarly journals Deflection Mechanism and Safety Analysis of Coal Mine Shaft in Deep Soil Strata

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Jihuan Han ◽  
Jiuqun Zou ◽  
Chenchen Hu ◽  
Weihao Yang
Keyword(s):  
Coal Mine ◽  
Rational Design ◽  
Coal Pillar ◽  
Design Parameters ◽  
Deep Soil ◽  
Mine Shaft ◽  
Dynamic Prediction ◽  
Probability Integral Method ◽  
Mining Conditions ◽  
Shaft Deflection

The main shaft and auxiliary shaft in the Guotun Coal Mine underwent large deflections, with deflection values of 359 mm and 322 mm, respectively. These two deflections represent the first occurrence of such large vertical shaft deviations in the soil strata in China. The deflection problem has seriously affected the hoisting safety and lining safety and has become a serious impediment to the sustainable production of mines. Therefore, the deflection mechanism must be determined. For this purpose, based on mining subsidence theory, the spatial probability integral method and a more accurate time function were used to establish a model, called 3D dynamic prediction model, for predicting the shaft movement. The formulas for calculating the lining stress caused by coal mining were based on established models. With measured shaft deflection data, the prediction parameters for deep soil strata were calculated on the basis of an inversion analysis. A comparative analysis of measured and calculated deflection values revealed that the reason for shaft deflection in Guotun Coal Mine is the insufficient size of the protection coal pillar (PCP); namely, the design parameters of the PCP in current codes are not applicable to the deep soil strata. As a result, under the asymmetric mining conditions, mining causes the shaft to deflect without damage and under the symmetric mining conditions, mining causes the lining to fracture. The results have an extremely important significance for the prevention and control of shaft deflection, for the rational design of PCP, and for the sustainability of mine production.

scholarly journals InSAR Observation and Numerical Modeling of the Earth-Dam Displacement of Shuibuya Dam (China)

2016 ◽  
Vol 8 (10) ◽  
pp. 877 ◽  
Author(s):  
Wei Zhou ◽  
Shaolin Li ◽  
Zhiwei Zhou ◽  
Xiaolin Chang
Keyword(s):  
Numerical Modeling ◽  
Earth Dam ◽  
The Earth

EVALUATION OF STRAINS OF RUN-OF-RIVER UNIT EARTH DAM

2015 ◽  
Vol 5 (1) ◽  
pp. 62-70 ◽  
Author(s):  
Mikhail I. BAL’ZANNIKOV
Keyword(s):  
Electric Power ◽  
Earth Dam ◽  
Electric Power Station ◽  
Reliability Growth ◽  
Power Station ◽  
Design Specifications ◽  
Initial Design ◽  
The Earth ◽  
Run Of River

The earth dam of run-of-river unit - Kuybishevskaya hydro-electric power station on Volga - is viewed. The main characteristics of earth dam, particularities of its construction and exploitation are presented. The factors that have changed initial design specifications of its exploitation are highlighted. Evaluation of geometrics of earth dam in different exploitation periods and potential causes of their tolerance are analyzed. Measures for exploitation reliability growth are proposed.

scholarly journals Calculation the options of cracks in the earth dam

2016 ◽  
Vol 53 ◽  
pp. 01034
Author(s):  
Yulia Ibraeva ◽  
Georgiy Bulatov ◽  
Philipp Tarasevskii
Keyword(s):  
Earth Dam ◽  
The Earth

The Applications of Concrete Cut-Off Wall in the Reinforcement of the Earth Dam

2010 ◽  
Vol 150-151 ◽  
pp. 749-752
Author(s):  
Jing Long Li ◽  
Shu Cai Li ◽  
Shu Chen Li
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Earth Dam ◽  
Elastic Model ◽  
Cutoff Wall ◽  
The Earth ◽  
Before And After ◽  
Coulomb Model ◽  
Explicit Finite Difference ◽  
Explicit Finite Difference Method

The concrete cutoff wall is a technology used in reinforcing sick dams more usually in recent years. In the text, the advanced FLAC3D method which is based on 3-D explicit finite difference method, is used to simulate a reinforcement of earth dam using concrete cutoff wall. Through the simulation, Mohr-Coulomb model, elastic model and Goodman element are used to analyse the distribution of the stress and the strain of the dam before and after reinforcement. Consequently, we can evaluate the unti-seepaging effect and raise the possible question.

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