On Karst Water Inrush (Gushing) Geological Environment in Pingyang Tunnel

2014 ◽  
Vol 580-583 ◽  
pp. 1008-1012 ◽  
Author(s):  
Qing Qing Zhu ◽  
Qiang Qiang Miao ◽  
Shu Ping Jiang
Keyword(s):  
Surface Water ◽  
Engineering Geology ◽  
Water Inrush ◽  
Water Environment ◽  
Rock Properties ◽  
Karst Water ◽  
Geological Environment ◽  
Underground Engineering ◽  
Engineering Construction ◽  
Groundwater Environment

According to Pingyang tunnel karst complex groundwater environment ,This paper carried out thorough theoretical analysis and field observation from Pingyang tunnel stratum rock properties, engineering geology, hydrogeology, the surrounding patch, runoff and drainage and the changes of surface water environment, as well as tunnel excavating. The complex formation mechanism has given in the Pingyang tunnel karst water . Some effective references had put forward for the engineering treatment, provided some valuable references for other similar underground engineering construction.

scholarly journals Physical Simulation of the Water-Conducting Fracture Zone of Weak Roofs in Shallow Seam Mining Based on a Self-Designed Hydromechanical Coupling Experiment System

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Hao Zha ◽  
Weiqun Liu ◽  
Qinghong Liu
Keyword(s):  
Surface Water ◽  
Coal Mine ◽  
Physical Simulation ◽  
Early Stage ◽  
Water Inrush ◽  
Water Environment ◽  
Hydromechanical Coupling ◽  
Fracture Evolution ◽  
Working Face ◽  
Seam Mining

Due to inappropriate mining practices, water-conducting fracture zones can develop in an aquifer, not only destroying the surface-water environment but also causing water inrush, even hurting or killing workers. To avoid such disasters, investigating and simulating the evolution mechanism of water-conducting fractures are becoming a research focus in mining engineering, especially regarding the organisation and development of fractures. Our work mainly involved the design of low-strength analogous materials and the simulation of fracture evolution for weak-roof problems in shallow seam mining based on a self-built experimental hydromechanical coupling system. The experimental results show that the vertical stress in the roof increases first as the working face approaches and finally decreases to near its initial value as the working face passes. The relationship between fracture depth and coal-seam excavation distance is obviously nonlinear. The leakage velocity of surface water remains stable in the early stage of excavation and increases when the fracture develops through the main aquifuge. The maximum fracture depth is 76.18 m for the Yili coal mine with weak roofs and shallow coal seams. In addition, we numerically simulated and verified the evolution patterns with the FLAC3D platform. The simulated fracture depth of the Yili coal mine agreed with the in situ borehole observation very well and was more accurate than the output of the empirical formula. Our work provides new methods and relevant data for research on the evolution of water-conducting fractures in weak roofs during shallow seam mining.

scholarly journals Water Inrush Hazards in the Chaoyang Tunnel, Guizhou, China: A Preliminary Investigation

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1083 ◽  
Author(s):  
Nan Zhang ◽  
Qian Zheng ◽  
Khalid Elbaz ◽  
Ye-Shuang Xu
Keyword(s):  
Preliminary Investigation ◽  
Water Inrush ◽  
Water System ◽  
Control Measures ◽  
Guizhou Province ◽  
Karst Water ◽  
Geological Condition ◽  
Underground Engineering ◽  
Management Measures ◽  
Self Protection

This paper reports on a water inrush hazard, which occurred during the construction of the Chaoyang tunnel in Libo County, Guizhou Province, China. On 10 June 2018, a continuous water inflow of about 57 thousand m3 of water within 40 min took place at the tunnel excavation face, resulting in three casualties. The objectives of this study are to investigate and discuss the water inrush process of this atypical case. Further, an inclusive description of the implemented emergency responses will be provided. The principal causes of this tunneling incident include the karst geological condition at the construction field, hydraulic conductivity induced by the connection between karst water system and surface water body, and effects of excavation and precipitation. Moreover, based on a preliminary investigation and analysis, three main control measures to overcome similar incidents in the future are proposed: (1) Performing “water inrush risk grading” in areas prone to water inrush; (2) undertaking comprehensive geological forecast for a synthetic analysis; and (3) employing a monitoring system during the construction, and educating workers on self-protection skills. These effective management measures are bound to benefit underground engineering constructions with regard to water inrush risks.

Research on the Influence of Coal Mining on Aquifer

2015 ◽  
Vol 730 ◽  
pp. 113-116
Author(s):  
Peng Jie Wang ◽  
Hua Jin ◽  
Tian Ju Zhang
Keyword(s):  
Surface Water ◽  
Coal Mining ◽  
Water Inrush ◽  
Water Environment ◽  
Influence Factors ◽  
Shanxi Province ◽  
Coal Seams ◽  
Fractured Zone ◽  
Aquifer Systems ◽  
The Impact

The height of the water flowing fractured zone and the extent of water inrush caused by coal mining are the main influence factors on aquifer systems. Taking a coal mine of Shanxi province as research object, the impact of coal mining on regional surface water and groundwater was evaluated. The heights of the water flowing fractured zone of coal seams in No.3, No.8-2, No.15-1 and No.15-3 were 68.62~98.62m, 31.21~58.25m, 30.59~33.41m and 31.45~42.33m respectively. The results showed that the surface would not be penetrated and the surface water environment could not be impacted seriously. While the lower shihezi formation aquifer which was the mined-out area of coal seams in No.3 and No.8-2 would be penetrated. Coal seam in No.15-3 belongs to relatively safe area, which water inrush coefficient ranged from 0MPa/m to 0.0148MPa/m.

Surface Water Quality Assessment in Main Stream of Liaohe River

2013 ◽  
Vol 788 ◽  
pp. 354-358
Author(s):  
Hui Wang ◽  
Li Na Sun ◽  
Pan Du
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Quality Assessment ◽  
Membership Function ◽  
Water Environment ◽  
Surface Water Quality ◽  
Water Quality Assessment ◽  
Monitoring Station ◽  
Main Stream ◽  
Liaohe River

The objective of this research was to study the surface water quality and evolution of surface water environment in Liaohe River main stream. Results showed that the surface water quality was declining along main stream. It was better in flood reason than others. It was best in Defudian monitoring station and worst in Shuguangdaqiao monitoring station. This research would significantly improve the understanding of the evolution of surface water environment in Liaohe River main stream.Keywords: water quality assessment; Liaohe River; membership function

scholarly journals Wastewater treatment in submerged aerated biofilter under condition of high ammonium concentration

2017 ◽  
Vol 24 (3) ◽  
pp. 431-442 ◽  
Author(s):  
Katarzyna Pawęska ◽  
Aleksandra Bawiec ◽  
Krzysztof Pulikowski
Keyword(s):  
Surface Water ◽  
Biological Membrane ◽  
Water Environment ◽  
Membrane System ◽  
Ammonia Nitrogen ◽  
Ammonium Concentration ◽  
Service Areas ◽  
Biogenic Compounds ◽  
Low Efficiency ◽  
Favorable Conditions

Abstract Treatment of wastewater produced in Service Areas (SA) located on expressways and highways is a worldwide problem because of increasing amount of roads and specific composition of those kinds of sewage. Insufficient removal of pollutants from wastewater discharged into surface water may cause serious environmental problems. In the present study efficiency of treatment of wastewater with high ammonium concentration in biological membrane system used on SA was investigated. Concentrations of ammonia nitrogen in wastewater flowing into bioreactor in none of the tested objects did not fall below 99.0 mg of N-NH4·dm−3. Because of high ammonium content in sewage and high pH reaching value about 9, it is almost impossible to create favorable conditions for microorganisms that run purification processes resulting in low efficiency of phosphorus and nitrogen removal (reduction of biogenic compounds did not exceed 15%). Treatment of wastewater consisting mainly of urine with commonly used biological membrane technology has to be widely tested to perform suitable quality of discharged wastewater, to provide safety of surface water environment.

scholarly journals Automatic Monitoring System in Underground Engineering Construction: Review and Prospect

2020 ◽  
Vol 2020 ◽  
pp. 1-16 ◽  
Author(s):  
Lixin Wang ◽  
Shuoshuo Xu ◽  
Junling Qiu ◽  
Ke Wang ◽  
Enlin Ma ◽  
...  
Keyword(s):  
Monitoring System ◽  
New Technology ◽  
Automatic Monitoring ◽  
Future Research ◽  
Underground Engineering ◽  
Automatic Monitoring System ◽  
Engineering Construction ◽  
Intelligent Technology ◽  
Time Acquisition ◽  
Engineering Monitoring

Automatic monitoring system is one of the main means to ensure the safety of underground engineering construction. This paper summarizes the current international research and application status of the underground engineering monitoring system from three aspects of data acquisition, data transmission, and data processing and emphatically introduces the mainstream new technology of the monitoring system. Furthermore, this paper puts forward specific and implementable technical routes based on the current intelligent technology and the challenges faced by future monitoring, which can provide direction and reference for future research, including high-precision real-time acquisition and safe and reliable transmission of monitoring data, multisource data fusion, and the visual intelligent early warning platform.

scholarly journals Overview of surface water hazards in China coalmines

2019 ◽  
Vol 14 (4) ◽  
pp. 851-862
Author(s):  
Herong Gui ◽  
Rongjie Hu ◽  
Honghai Zhao ◽  
Jun Li ◽  
Xiaomei Song ◽  
...  
Keyword(s):  
Surface Water ◽  
Water Inrush ◽  
Water Sources ◽  
Climatic Impact ◽  
Mining Conditions ◽  
Water Hazard ◽  
Major Factors ◽  
Water Hazards ◽  
The Relationship ◽  
Terrain Features

Abstract Among all recorded water disasters in China coalmines, 10% can be attributed to surface water, making it one of the top water hazards. Based on the analysis of cases of surface water hazards in China coalmines, this article determined surface water sources and inrush conduits as the major factors that have caused water inrush disasters in mines, and classified surface water hazards in China coalmines into 15 types according to those major factors and gave definitions of each type of surface water hazard. Then, it is proposed that there are different types of surface water hazards in different coal-bearing regions by analyzing the relationship to terrain features, climatic impact and mining conditions. Finally, we discuss how typical water sources and inrush conduits work together in hazard formation, in addition to the characteristics and corresponding preventative technologies. The propositions can be of reference for exchanges with other mining countries and regions on surface water hazard treatment.

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