Study On Dynamic Response And Interaction Of Soil Slope And Its Anchoring Structure Subjected To Earthquake

Slope stability under earthquake is an important topic in geotechnical engineering and earthquake engineering. Some views about slope stability design methods have not been to an agreement because some theories are still very tentative. In this report, shaking table test and numerical simulation method are applied to analyze dynamic response and mechanics characteristic of soil slope and its supporting structures subjected to earthquake. Results show that:(1) PGA amplification factor is cited to analyze the acceleration response of soil slope strengthen by anchors and lattice beams. The PGA amplification factor is very high and rise from the the bottom when the dynamic loads with low frequency are input. The value is lower when the dynamic loads with high frequency are input, and the value of the wrest is lowest.(2) Anchors are bent under dynamic loads and stresses in them are very high. Under weak dynamic loads, the stresses of middle row anchors are the hightest and the values of bottom anchors are the lowest. If the dynamic loads are stronger, the stresses of bottom anchors are the highest and the values of top anchors are the lowest. Yet the pulled-out-lenth of top anchors is the longest and the lenth of bottom anchors is the shortest, so the axial force is the highest.(3) The instantaneous horizontal displacement around the crest of the slope is the largest, and the value is decline with the depth from the crest. The permanent horizontal displacement at the toe of the slope is the largest, and the vertical displacement happened at the top of the slope. During dynamic loading, the deformation type of the active part was rotation and horizontal displacement.(4) The strain values of anchors and lattice beams change up and down between positive and negative values. When the load is so high to destroy the slope and its supporting structures, the strain values will change beyond any law.(5) The strain level of the horizontal lattice beam is the same as that of the vertical lattice beam under the same incentives. For the same row horizontal lattice beams, the strains of the middle beams are larger than those of both sides. For those vertical lattice beams, the strains of them show difference at the initial stage and at the end of the loding. For every beam, the stress value at the middle is higher at the initial of loading, and the values are higher at the point where the beam is joined with anchors.(6) The highest values of the velocity, acceleration of the slope and the stress of anchors occure at the initial loading stage, and then keep in a stable value.(7) The peak stresses of anchors increased with dynamic loading time. The longer the duration of the earthquake, the adhesive force between the anchors and the soil would easily are weakened, and the damage to anchors would be more serious.