Research On Support Technology Of Soft Rock Roadway In Deep Mining Of Coal Mine

On a national energy consumption increases unceasingly, led directly to the coal mining enterprises, but also strengthened led to increased coal mining depth, leaving some coal mining depth, leaving some coal mining depth has more than kilometers. Deep roadway increase in stress level appeared in the roadway and mine pressure is serious and violent, surrounding rock deformation shows soft rock surrounding rock deformation characteristics, roadway support became more and more difficult. The traditional roadway support structure and support parameters already can not adapt to the deep mine high stress deformation law of soft rock roadway, and the existing deep roadway control countermeasures immature, this makes the stability of surrounding, rock roadway without effective control and roadway constantly repair even abandoned, caused a huge economic losses. How to effectively control high stress soft rock roadway surrounding rock deformation in deep mine, has become urgent problems.This paper is depends on LaoShidan coal mining deep roadway supporting project, through the theoretical analysis, field measurement and laboratory research, numerical simulation of the mechanical characteristics of surrounding rock of deep soft rock tunnel excavation has carried on the experimental study, and analyzes the characteristics of weak surrounding rock deformation and destruction. Through the field investigation found that the sides and the roof of the roadway is the main part, With the help of Flac3D I built the model of the roadway and discussed the stress of the roadway surrounding and damage distribution of plastic zone. Through existing bolt support theory, introduces the new way of supporting and let pressure pre stressed bolting device on the large deformation of deep soft rock tunnel excavation control role, and put forward a new understanding of coal roadway support. Then established on the basis of the original support way by adjusting the supporting parameters, analysis under different support scheme of roadway roof and two for the size of the displacement, and compared with the original support scheme, finally chooses the best supporting scheme, effectively constrained deformation of roadway surrounding rock, similar to the geological environment for the future of weak surrounding rock supporting control provides a reliable reference value.