Shaking Table Model Tests for Composite Reinforced Slopes

Waste tires and triaxial geogrids can be used as new reinforcement materials in geotechnical engineering, with merits of excellent mechanical performance, economy and environmental friendliness. Shaking table tests were conducted to study the dynamic performances including distribution of acceleration amplification factor under various conditions such as different earthquake waves, peak ground accelerations(PGA)and reinforcement methods.The slope models include unreinforced slope,triaxial geogrid reinforced slope,triaxial geogrid-waste tire composite reinforced slope,waste tire-tire shred composite reinforced slope. The experimental results show that the seismic performance of the reinforced slopes is significantly improved.Compared with unreinforced slopes, the maximum decrease of acceleration magnification for triaxial geogrid reinforced slope is 37.5%, 30.0% for triaxial geogrid-waste tire composite reinforced slope and 21.0% for waste tire-tire shred composite reinforced slope under Wenchuan wave excitation. The average acceleration magnification reduction of triaxial geogrid reinforced slope is 1.4 and 2 times greater than those of the latter two types of the slopes. Acceleration amplification factor of the reinforced slopes increases with the seismic excitation in a nonlinear way. Compared with the unreinforced slopes,the increasing amplitude of acceleration amplification factor decrease with the input of PGA.Along the surface of the slope about 1/3 of the slope elevation,acceleration magnification factor of the reinforced slopes increase gradually with the elevation,and reaches the maximum at the slope top.The acceleration response induced by Qianan wave is significantly stronger than those induced by other three types of seismic excitations.