A Study On Numerical Simulation And Optimization Of Rockbolt Mesh Shotcrete Support In Deep Roadway

This paper discusses the general laws of deformation in and after the process of deep roadway excavation. The main factors influencing the displacement of roadway are discussed. By analyzing the data of actual measurement from the roadway of Qian yingzi coal mine, the stress field and displacement field after the excavation of roadway are discussed, results of numerical modeling and field test are compared.As a result of the impact of excavation, the strength of intact rock is disturbed, so the strength input parameter in numerical analysis can't use the data directly from field test, a reduction is needed. For this purpose, a failure criterion--Hoek-Brown failure criterion whick can consider the strength reduction has been applied. As part of the criteria that affect the parameters of the degree of strength reduction—GSI index, has been discussed about the determination and application.Base on the quantitative parameter JV, a linear formula to attain the parameter a and s for Hoek-Brown criterion was established.In the numerical analysis of this paper, using the built-in Fish language of FLAC3D, accomplished the partial resin grout rockbolt by use of FISH language in FLAC3D, through the structure element function s_near( ), s_cid( ), etc. and user defined function create links between endpoint of rockbolt and node of concrete liner automatically, set the property of link and cableSel automatically. Achieve the partial anchored rockbolt in three dimension problem. So the analysis is more reasonable and reliable.Through the compare of data from field measurement and numerical simulation, a optimize proposal on the parameters of rockbolt mesh shotcrete support of Qian yingzi roadway is proposed. Proved by the practice that the optimization results are reasonable, the support is effective. The analysis in this paper provides a useful reference for other deep roadway of rockbolt mesh shotcrete support.