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...

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...

Top-coal caving technology is a productive and efficient method in modern mechanized coal mining, the study of coal-rock recognition is key to realizing automation in comprehensive mechanized coal mining. In this paper we propose a new discriminant analysis framework for coal-rock recognition. In the framework, a data acquisition model with vibration and acoustic signals is designed and the cav...

Abstract Discrete element calculations of the top-coal drawing process for different gangue-coal density ratios were conducted to investigate effect ratio on mechanism in longwall caving. The effects analyzed body, boundary, and recovery top coal. results show that increasing ratio, initial body goaf side is farther away from support its width volume gradually increase. upper part sickle-shaped...

With the increase of social demand on environmental quality, the clean coal technology (CCT) is one of the most effective measures for environmental control. It is an important means in CCT to decrease the gangue content. Targeting at distinguishing the top-coal and gangue, this paper discussed coalgangue interface detection on fully mechanised mining face. The Hilbert marginal spectrum based o...

In longwall top coal caving (LTCC), the resource recovery ratio of working face is directly determined by ratio. An investigation evolution drawing characteristics and revealing parameters necessary when providing guidance for parameter selection improving Based on in-situ measurements size distribution caved blocks in Wangjialing mine, a finite difference method (FDM)–discrete element (DEM) co...