关键词: 地下开采, 渗流, 锚杆支护, 弹塑性理论, 稳定性分析, FLAC3D

Abstract: The existence of groundwater poses a great threat to the stability of roadway surrounding rock. In order to study the influence of groundwater seepage on the support of deep roadway,based on the equivalent theory of seepage on rock mass volume force and the equivalent strength criterion of cavity-anchoring bolt,the theoretical solution of plastic stress field and plastic zone distribution of roadway surrounding rock under seepage action is derived by applying the elastic-plastic theory. The method of determining the parameters of the bolting scheme considering the field seepage is given by using the equivalent circle method. Taking a mine in southwest Shandong Province as an example,the parameters of bolt length,interrow distance and preload force of the main roadway of the mine return air are given,and the rationality of the supporting parameters is verified by FLAC3D numerical simulation. The results show that:① Considering the seepage effect,the plastic zone increases and the stability coefficient decreases,and the distribution of plastic zone can be effectively reduced by reducing the spacing between rows. ② The field parameters were determined by theoretical calculation, and the numerical simulation verification results showed that the field support scheme significantly improved the stability of the roadway,effectively reduced the range of plastic zone,and controlled the deformation of surrounding rock.

Key words: underground mining,seepage,bolt support,elastic-plastic theory,stability analysis,FLAC3D