Deformation mechanism of stope slope and control effect of NPR anchor cable under rainfall conditions
The existence of weak interlayers in slope can lead to the deterioration of rock mass proper-ties,and the slope can slip along the weak structural plane in bad geological conditions.Taking the slope of a certain open-pit mining area as the research background,the mechanism of slope instability and the control effect of NPR anchor cable were studied by in-situ geological investigation,indoor phys-ical model test and numerical simulation.The results show that:The rear edge of the slope is dominated by tension cracks and shear cracks,mainly L01 and L08;The development depth of the L01 crack is a-bout 22～26 m,and the L08 crack is located at the junction of the slope top and back edge,with a total length of 233 m,which has the risk of slope instability;When rainfall causes surface seepage and the moisture content of weak interlayers is 5%,10%,15%,and 20%,the sliding of the slope is centimeter level,with maximum horizontal displacements of 14.9,18.9,21.9,and 18.5 cm,and maximum verti-cal displacements of 35.8,51.7,101.8,and 291.0 cm,respectively;Seepage has obvious influence on the rock mass on the slope,and the risk of slope sliding is greater.NPR anchor cable has a strong com-pensatory mechanical effect on sliding slope,and the average preload is about 300 kN,which has more advantages than the traditional anchor cable to resist the slide of surrounding rock.The compensatory mechanical behavior of NPR anchor cable to landslide can provide scientific basis for the treatment of other slopes.
slopeseepagestressstrainnumerical simulationphysical model
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