Analysis of developmental features and causes of the ground cracks induced by oversized working face mining in an aeolian sand area

Li, Liang; Wu, Kan; Hu, Zhenqi; Xu, Yuankun; Zhou, Dawei

doi:10.1007/s12665-017-6452-9

Cited by 40 publications

(24 citation statements)

References 2 publications

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“…With the increasing severity of mining subsidence worldwide, the scientific community is becoming increasingly interested in studying its impact., such as surface cracks, sand inrush disasters, soil hydraulic properties, and geological risks [2,6,21,22]. However, the responses of soil nutrients, enzymes, and microbes to mining subsidence remain poorly studied, particularly within fragile ecological regions of western China.…”

Section: Introductionmentioning

confidence: 99%

Land Subsidence in a Coal Mining Area Reduced Soil Fertility and Led to Soil Degradation in Arid and Semi-Arid Regions

Zhang

Ruan

et al. 2019

IJERPH

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Underground coal mining in western China causes heavy land subsidence and alters the soil ecology. However, the effects of land subsidence on soil fertility are not currently known, and the key factors governing its impact remain unclear in sandy land. We investigated the effects of land subsidence induced by underground mining on the soil quality in western China. Soil samples were collected at 0–15 cm and 15–30 cm from control and subsidence areas in three coal mines. The results showed that the soil water content (SWC), clay and silt percentage, total nitrogen (TN), dissolved organic carbon (DOC), ammonia nitrogen (NH4+-N), nitrate nitrogen (NO3--N), available phosphorus (AP), and available potassium (AK) of the subsidence areas were significantly lower than those of the control areas. The saccharase, urease, and alkaline phosphatase activities in the subsidence areas decreased compared to those in the control areas, while the sand percentage of soil tended to increase. Soil nutrient contents, bacterial quantities, and activities of soil enzymes were positively correlated with SWC. Redundancy analysis (RDA) showed that the soil particle size distribution, SWC, and electrical conductivity (EC) were the major environmental factors driving changes in soil properties. These results indicated that land subsidence induced by coal mining caused losses in surface soil water and nutrients, and ultimately led to soil quality degradation. Therefore, the reclamation of mining subsidence land might be necessary, especially in arid and semi-arid areas.

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Section: Introductionmentioning

confidence: 99%

Land Subsidence in a Coal Mining Area Reduced Soil Fertility and Led to Soil Degradation in Arid and Semi-Arid Regions

Zhang

Ruan

et al. 2019

IJERPH

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“…Zhang et al [16] adopted three methods to observe the height of a WCFZ, including borehole water leakage, borehole TV images, and numerical simulation. Methods that have been used to study the development law of the WCFZ include various numerical simulation methods, such as rock failure process analysis (RFPA) [17,18], Universal Distinct Element Code (UDEC) [1,19,20], Fast Lagrange Analysis of Continua (FLAC) [12], Particle Flow Code (PFC) [21], and the similar-material simulation method [22]. Also, borehole TV and an electrical logging drilling fluid loss observation system have been adopted to observe the height of the WCFZ.…”

Section: Introductionmentioning

confidence: 99%

Formation Mechanism and the Height of the Water‐Conducting Fractured Zone Induced by Middle Deep Coal Seam Mining in a Sandy Region: A Case Study from the Xiaobaodang Coal Mine

Xie

Hou

Wang

et al. 2021

Advances in Civil Engineering

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The height of the water-conducting fractured zone (WCFZ) is a basic parameter related to water protection in coal mines and is also crucial for aquifer protection and mine safety. In order to accurately detect the height and shape and reveal the formation mechanism of the WCFZ, which is caused by middle-deep coal seam mining in a sandy region, the 112201 coalface at the 1# coal mine of Xiaobaodang was taken as a case study. Filed measurements including fluid leakage, borehole TV, and similar simulation were adopted to analyze the regularity of the WCFZ in this area. The detection results of field measurements showed that the maximum height of the WCFZ was 177.07 m in a borehole near the open-off cut, and the ratio of the height of the water-conducting fractured zone divided by the mining thickness was 30.53. The WCFZ acquired an inward-convergent saddle shape, which was inclined to the goaf. The saddle bridge was located at the boundary of the goaf, and the saddle ridge was located at the center of the goaf. Also, through analyzing the results of similar simulations, we found that, in the process of mining, separation cracks and the beam structure were the main forms of overburden disturbance transmitting upward and ahead of mining, respectively. The main cause of the increase in height of the WCFZ was the connection of the separation cracks and vertical cracks caused by fractures of beam structures. The development of the WCFZ was divided into five stages: incubation stage, development stage, rapidly increasing stage, slowly increasing stage, and stable stage. Moreover, the duration of each stage was related to the lithology and mining technology. This research can provide significant theoretical insights for the prediction of the WCFZ, enabling the prevention of water hazards on mine roofs and assisting with water resources protection.

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“…The definition of "super-large" is not strict, according to Refs. [1][2][3][4][5][6][7][8], as a super-large coalface should at least have a length in the dip direction of 300 m, a length in the strike direction of 3000 m, a mining thickness of 5 m and a mining speed of 8 m/day.…”

Section: Introductionmentioning

confidence: 99%

“…After excavation, the overlying strata first fractures and bends. By employing field data and physical and numerical experiments, the fracture theories and control methods of the overlying strata have been studied in the Shendong coalfield [6,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…However, due to noise and other factors, InSAR monitoring results cannot easily reflect actual subsidence deformations of slopes and curvatures [12]. Numerical [13][14][15] and physical [6,8] simulations are also usually used in ground subsidence research in this coalfield. Using all these aforementioned methods, the ground subsidence characteristics and subsidence parameters [13,16] as well as their dynamics [11] have been studied.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Mining-Induced Ground Damage Using Orthogonal Experiments to Determine Key Parameters of Super-Large Coalface: A Case Study in Shendong Coalfield in China

Cai

Xiao

et al. 2020

Applied Sciences

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High-strength mining of super-large coalfaces in the Shendong coalfield causes significant damage to the ground surface. To study the key parameters of undermined coalfaces that affect ground damage, 25 numerical simulation models were designed using an orthogonal experimental method based on the geological and mining conditions of the Bulianta Mine. In the orthogonal design, four factors (the lengths in both the dip and strike directions, the thickness and the mining speed of the coalface) were considered, with five levels designed for each factor. The subsidence displacements and deformations caused by the excavation were then simulated and verified using field surveying data. A damage extent index (DEI) was introduced and used to assess the extent of global ground damage caused by each simulative excavation. Analysis of variance (ANOVA) method was then employed to determine the key parameters of the coalface that significantly influence the ground damage. It was found that the coalface dip length and thickness and the coalface thickness can be regarded as the key parameters for ground objects of building and timberland, respectively. This research provides theoretical and technical support for the coordinated exploitation of resources and environments in Shendong and other similar, ecologically fragile coalfields.

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Analysis of developmental features and causes of the ground cracks induced by oversized working face mining in an aeolian sand area

Cited by 40 publications

References 2 publications

Land Subsidence in a Coal Mining Area Reduced Soil Fertility and Led to Soil Degradation in Arid and Semi-Arid Regions

Land Subsidence in a Coal Mining Area Reduced Soil Fertility and Led to Soil Degradation in Arid and Semi-Arid Regions

Formation Mechanism and the Height of the Water‐Conducting Fractured Zone Induced by Middle Deep Coal Seam Mining in a Sandy Region: A Case Study from the Xiaobaodang Coal Mine

Simulation of Mining-Induced Ground Damage Using Orthogonal Experiments to Determine Key Parameters of Super-Large Coalface: A Case Study in Shendong Coalfield in China

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