STUDY OF DOUBLE-CABLE-TRUSS CONTROLLING SYSTEM FOR LARGE SECTION COAL ROADWAY OF DEEP MINE AND ITS PRACTICE

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Abstract Aiming at the controlling problem of the large deformations in the roof and coal sides in the process of surrounding rock support in large section coal roadways of deep mine，combining with the field investigation，numerical simulation，theoretical analysis，field test and field monitoring，the deformation failure characteristics of surrounding rock are analyzed. Then，a surrounding rock controlling system for large section roadway called double-cable-truss(DCT) is put forward. The composition structure，controlling mechanism and supporting superiority of DCT，stress field distribution characteristics of surrounding rock and key supporting parameters，etc. are researched systematically. The research results are as follows：(1) The deformation characteristics of large section coal roadways of deep mine are of large displacement，high sensitivity coefficient，continuous deformation and strong pertinence of failure. (2) Thick load bearing layer and rundle anchor structure in the surrounding rock of roadway are formed when using the new double-cable-truss controlling system. It could improve tensile and shear strength and ensure the surrounding rock and supporting structure to be stable. (3) The simulation results show that the vertical and uniform prestressed belts to the roof or two sides can be formed by the DCT. The stress dispersion degree is low and the effect range is 3–5 m. (4) A typical successful case of DCT application to large section coal roadway of deep mine is introduced in detail. The research achievements are applied to Xingdong mining area，which have great theoretical and practical values to similar roadway supports.

Key words： mining engineering deep mine double-cable-truss controlling system coal roadway

Received: 16 April 2012

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http://www.rockmech.org/EN/Y2012/V31/I11/2248

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