| Because of the Theological characteristics of soft rock, the Theological characteristics of rock must be considered in support and design of soft rock roadway bearing long-time load, this paper tries to do this. According to the local conditions of rapid deformation rate, large deformation, long deformation time and difficult support of Henan Yima Chang village mine, this paper studies and develops 2D elasto-visco-plastic finite element numeric simulation software with the Bingham model after analyzing 2D elasto-visco-plastic finite element theory, solutions and steps of 2D elasto-visco-plastic problems thoroughly. This paper studies the pre-mining and relieving test of No.21 pan extending dipheads of Chang village mine, the following contents are included: distribution law of abutment pressure in gob and floor rock mass and relieving area prediction, rational position of extending dipheads, reasonable parameters and position of relieving face, deformation law of surrounding rock of rock dipheads, rational support-time of rock dipheads roadway, support and control of rock dipheads roadway, test result analysis of pre-mining and relieving. As to the choosing index of roadway position, this paper brings forward a new concept, that is effective strength coefficient. Combining the floor-distribution index with the index of effective strength coefficient must be more consistent with practice. It has great significance. The result of local relieving and support test are good.
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