Research on Electrical Characteristics of Water Conducted Crack Zone in the Coal Seam
نویسندگان
چکیده
Water disaster is one of the five natural disasters in coal mines, and it badly threats the lives safety of miners. As well known, the main reason of evoked flooding is water conducted fractured zone in the coal seam. Based on the Maxwell equation, we try to study the relationship between apparent resistivity and stratigraphic dip as well as strata direction. The numerical results show that the apparent resistivity has a good indication of direction of fracture for the fractured formation. Finally, the rules which are between distribution of apparent resistivity and anisotropy of the earth are concluded. According to the rules, the anisotropic characters of crack zone can be analyzed.
منابع مشابه
Extension of Excavation Damaged Zone Due to Longwall Working Effect
In advance longwall mining, the safety of mine network, production rate, and consequently, economic conditions of a mine are dependent on the stability conditions of gate roadways. The gate roadway stability is a function of two important factors: 1) characteristics of the excavation damaged zone (EDZ) above the gate roadway and 2) loading effect due to the caving zone (CZ) above the longwall w...
متن کاملResearch on Chaos Characteristic of Crack Evolution in Coal-rock Fracturing
Precisely describing the formation and evolution rules of coal-rock fracturing crack have great value on reservoir fracturing improvement and highly efficient mining of coal bed methane well. In this paper, a non-linear dynamic method is used to study crack damage evolution behavior of coal-rock fracturing. Considering distribution characteristics of natural cracks in coal-rock, and based on da...
متن کاملElestoplastic Analysis of Barrier Pillars Above the Drifts in Inclined Seam (TECHNICAL NOTES)
In this paper, the effects of horizontal stress and dimensions of barrier pillars on the stability of drifts hr been investigated. An elastoplastic hybrid finite/boundary element program has been used. A plastic analysis of stresses in barrier pillars above the drifts in one of the underground coal mines with inclined seams is examined. Computed stresses and safety factor controur lines around ...
متن کاملFundamentals of 3D modelling and resource estimation in coal mining
The prerequisite of maintaining an efficient and safe mining operation is the proper design of a mine by considering all aspects. The first step in a coal mine design is a realistic geometrical modelling of the coal seam(s). The structural features such as faults and folding must be reliably implemented in 3D seam models. Upon having a consistent seam model, the attributes such as calorific val...
متن کاملDetermination of a suitable extraction equipment in mechanized longwall mining in steeply inclined coal seams using fuzzy analytical hierarchy method (Case study: Hamkar coal mine, Iran)
The longwall mining method is one of the most applied methods in extracting low-inclined to high-inclined coal seams. Selection of the most suitable extraction equipment is very important in the economical, safety, and productivity aspects of mining operations. There are a lot of parameters affecting the selection of an extraction equipment in mechanized longwall mining in steeply inclined coal...
متن کامل