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Risk Analysis and Extension Assessment for the Stability ...

Stability of Surrounding Rock in Deep Coal Roadway Chunjing Gao 1,2, Dongmei Huang 1,2,3, *, Xikun Chang 1,2,3, * and Han Xi 1,2 1 State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the

Subsidence from Underground Mining: Environmental …

effects of underground mining. The major em­ phasis is on coal mining. The time to plan for subsidence impacts is well before mining begins, not after surface effects are noticed. Because subsidence due to underground mining may be inevitable, the relevant questions to be asked are how much, when, and where, and

Stability analysis and determination of large-section ...

Abstract The interaction of chambers leads to serious failure of surrounding rock, especially in complex stress environment of deep coal mines. In this paper, the mechanical model for single chamber under dynamic and static combined loading is constructed, and the instability criterion of surrounding rock is obtained. According to the stress and energy characteristics in …

Ground stability of underground gateroad with 1 km …

Xingdong coal mine, located in the Xingtai coal mining area, was a typical Chinese deep coal mine, with an excavation depth of almost 1200 m below the ground. The shaft station was buried at an average burial depth of 1020 m. The entry was a curved-wall-top

Effect of Geological and Mining Factors on Roof Stability ...

"This paper examines the effect of different geological and mining factors on roof stability in underground coal mines by combining the field observations, laboratory testing, and numerical modeling. Observations at an underground coal mine that uses the room-and-pillar mining method showed several failures of the immediate roof, and is used as ...

Multifield Environmental Analysis and Hazards Prevention ...

Due to the different in-situ stress level, mining stress state, and surrounding rock properties of steeply inclined deep coal mining, the mutation mechanism of underground engineering rock mass is complex. This paper studies the cause and control of mining disaster of steeply inclined deep coal resources in Wudong coal mine. The results show that the structural …

"DEM numerical study on mechanical behaviour of coal …

The mechanical behaviour and stability of coal mining engineering underground is significantly affected by ground water. In this study, nuclear magnetic resonance imaging (NMRI) technique was employed to determine the water distribution characteristics in coal specimens during saturation process, based on which the functional rule for water distribution was proposed.

BEHAVIOUR AND STABILITY OF DEEP COAL MINING …

BEHAVIOUR AND STABILITY OF DEEP COAL MINING TUNNELS F.P.HASSANI(*) ABSTRACT This article gives an account of the parameters involved in predicting and analysing the support requirement and estimating the tunnel closure in main access tunnels in coal mining. A detail of in situ investigation of monitoring the extent of yield zone (zone of

Experimental investigation on rockburst behavior of the ...

Coal and rock burst are one of the main dynamic disasters that affect coal mine production. In this paper, the burst structural model of the rock-coal-bolt (RCB) system and the burst tendency ...

Effect of Tunnel Shape and Support System on Stability of ...

Stability level of tunnels that exist in an underground mine has a great influence on the safety, production and economic performance of the mine. Ensuring of stability for soft-rock tunnels is …

Mechanical behavior of coal under different mining rates: …

Mechanical behavior of coal under different mining rates: A case study from laboratory experiments to field testing International Journal of Mining Science and Technology ( IF 4.084) Pub Date :, DOI: 10.1016/j.ijmst.2021.06.007

Mechanisms behind strong strata behaviour in high …

Abstract. Safe and efficient mining of shallow coal seams relies on the understanding and effective control of strata behaviour. Field measurements, theoretical analysis and numerical simulations are presented in this study to investigate the mechanism behind abnormal strata behaviour, such as roof collapse and severe roadway deformation, that occurs in high longwall …

Pillar Design Aspect in UK Deep Coal Mining, Possibilities ...

Since the main aim is to determine the most appropriate method of mining for deep UK coal mining conditions, the above methods are compared in terms of maximum coal recovery and stability requirements. 2. BACKGROUND The efficiency and safety in either room and pillar, or longwaH mining is highly

Stability of the Evolutionary Game System and Control ...

Stability of the Evolutionary Game System and Control Strategies of Behavior Instability in Coal Mine Safety Management XinhuaWang,1 RongwuLu,2 HaoYu,1 andDanLi 1 ... production and coal mine safety regulation, we assume that the parameters described above satisfy the following

Investigation of stability of a tunnel in a deep coal mine ...

Xinwen coal area is one of the largest coalfields in Northern China that has been under production for a significant period of time. Most of the coal mines in this area have extended to a depth of almost 1000 m underground.Xiezhuang Coal Mine located in this area is the case study dealt with in this paper.Several development tunnels have been excavated in this mine to a …

MODELLING & SIMULATION OF FLUID FLOW …

sequestration. These cleats occur in nearly all coal beds. They are the reason behind stability and flow of fluid inside coal. These cleats have been investigated since early days of coal mining and provide a basis for simulation of fluid flow behavior inside coal structure. Fig.1 Natural fractures called cleats in coal

Effect of Mine Water on the Stability of Underground Coal ...

The basic objectives of mine roadways are to provide sufficient cross sections to accommodate equipment, transport, personnel travel and ventilation. However, many roadways become damaged to the extent of needing maintenance, generally dinting, and in some cases requiring re-ripping. Strata conditions play important effects on stability of roadways and other …

MultifieldEnvironmentalAnalysisandHazardsPreventionof ...

ronment of deep coal and rock mass under mining con-ditions. It is difficult to directly observe the mechanical behavior and internal physical process under engineering disturbance,whichisa"blackbox"process[20].According to the characteristics of electric, magnetic, and physical properties of goaf, borehole TV (BT) and transient elec-

Experimental Study on the Mechanical Behavior of Coal ...

underground coal mining, such as coal or rock bursts, have occurred more frequently.2 In contrast to the eastern regions of China, overlying confined aquifers are commonly present in the deep coal mines in west China.3 The Binchang mining area is located in a hilly and gully area of the Loess Plateau in Shaanxi Province, and it is the major

Behaviour Characteristics of Pressure Bump of Deep …

Pressure bump is a serious disaster to threat coal mine production safety. The roof and floor strata in Kailuan coal mine are made of sandstone and mudstone with relatively poor rigidity. Most of mines have been into the deep mining stage over one thousand meters. High-stress becomes the key factor induced pressure bump. In this paper, according to coal mining strata, fault …

Deep Mining: A Rock Engineering Challenge | SpringerLink

Increasing demand for metals caused by global economic growth and exploitation of shallow mineral deposits forces mineral extraction to go deeper. A direct consequence of this development is an increase in rock pressure-related mining problems. The role of rock engineering in the design and operation of deep mines is discussed in detail. Critical issues …

Study on the mechanism of crack formation and the …

Roadway safety is related to the high productivity and efficiency of coal mining, roof cutting and pressure releasing technology is one of the effective measures for roadway stability control. Under deep mining conditions,the stress condition around the blasthole is complex, and the expansion of directional crack will be affected by high ground stress. In this paper, Based on the engineering ...

Study on the Instability Characteristics and Bolt Support ...

In view of the influence of mining stress on the stability of the surrounding rock of inclined roof mining roadways in deep mines, the surrounding rock stability index is defined and solved based on the rock strength criterion and the stress distribution. The mining roadway of the 17102(3) working face of the Pansan Coal Mine is used as the engineering background and …

Risk Analysis and Extension Assessment for the Stability ...

In order to evaluate the surrounding rock stability of deep roadways, the diversity of accident hazard sources in deep coal mining is statistically analyzed. To conduct an effective evaluation, first, the risk analysis of the factors affecting the rock mass accidents is …

(PDF) Failure Behavior and Damage Characteristics of Coal ...

The depth effect of coal mechanical behavior seriously affects the safety and efficiency of deep coal mining. To explore the differences in failure behavior and damage characteristics of coal ...

Experimental Study on the Mechanical Behavior of Coal ...

When mining-induced fractures reach overlying aquifers, water enters the mining area and the coal is under different natural water saturation conditions, which significantly affect the mechanical behavior of the coal. In this study, uniaxial compression tests were conducted on dry, partially saturated, quasi-saturated, and fully saturated coal samples. The mechanical …

Stability Evaluation of Highwall Slope in an Opencast …

production. In India, the demand for coal for 2016-17, was estimated to be 884.87 MT, whereas the domestic availability was estimated at 724.71 MT. The gap of 160.16 MT was projected to be met through imports (https://coal.nic.in/). Opencast mining is a …