Stability Analysis of Surrounding Rock of Bolt Supporting Roadway Considering Seepage

To study the stability of bolt support roadway under seepage field, using the equivalent analysis method, the support effect of the bolt is considered as a set of clamping force acting on both sides of the anchor and the strengthening parameters of the surrounding rock. What’s more, the seepage field is transformed into a set of one-dimensional radial volume force uniformly distributed in the surrounding rock. At the same time, the effects of bolt support and seepage on surrounding rock are considered. Based on the elastoplastic theory, the stress distribution of the surrounding rock of the roadway is derived, and the radius equation of the plastic zone of the coordinated deformation of the anchor and the surrounding rock under the seepage is obtained. Finally, the evaluation method of the surrounding rock stability is proposed. The results show that the influence of bolt support parameters on the stability of surrounding rock under the effect of seepage and without seepage is compared and analyzed by numerical examples. Under the same conditions, the bolt is required to provide greater support when seepage is considered.