Research on improving stability of high and steep slopes of weathering tuff by anchor rod anchorage under different rainfall conditions
The texture of tuff is loose,with low shear strength and weathering resistance,making high and steep slopes of tuff prone to lo-cal collapse and even instability,resulting in landslides.To investigate the effect of different rainfall intensities on the stability of high and steep slopes of tuff next to the transportation road of an open-pit mine in Pingshuo,three rainfall intensities were selected and the stability and changes in pore water pressure of the tuff slope before and after anchor rod anchoring were compared and calculated,utili-zing the GeoStudio numerical analysis software.The results showed that under moderate rainfall conditions,the pore water pressure in-side the rock and soil mass decreased with the increase of rainfall time.After 5 hours of heavy rainfall and continuous heavy rainfall,the pore water pressure of rock and soil mass on the slope reached a stable state,and the rock and soil mass was balanced by rainwater infil-tration and the release of gas inside the pores.However,at the junction of moderately weathering tuff and strongly weathering tuff,the water flow was relatively large,this was due to the difference in permeability between the two layers of rock and soil mass,resulting in preferential seepage of rainwater,which means that slope sliding damage is likely to occur at this junction.After anchoring,the effective sliding arc area of the slope decreased,and the sliding arc safety coefficients of the silty sand layer and deep tuff bedrock increased,in-dicating that the anchors played a better anchoring role.This numerical simulation mainly considers the impact of rainfall on slopes,which can provide reference for similar structures of rock and soil mass slope engineering.
rainfall intensityanchor rod anchorageGeoStudiosafety coefficient
万方数据
维普
