The Seismic Properties Of Waste Tire Reinforced Embankment

The earthquake disaster data of Taiwan set,China’s Yushu and Wenchuan earthquake, Japan’s Kobe earthquake and Northridge earthquake show that geosynthetic reinforced soil structure flexibility is good, can effectively improve the seismic performance. Waste tire reinforced soil structure is a new technology in the development of nearly 10 years,the principle is similar to the geosynthetic reinforced.Waste tire reinforced soil structure with high strength and toughness, deformation adaptability, long term stability, tensile modulus and its three dimensional interlocking structure is better, with good seismic and anti-collision performance, quick construction, low cost, no negative effect on the environment and groundwater, better durability. In this paper, through the shaking table model test and flac3 d systematic research the dynamic performance and reinforced effect of waste tires reinforced embankment slope under earthquake dynamic.(1) The dynamic performance of waste tires reinforced slopes is conducted under seismic action through shaking table tests. Some factours are considered including different earthquake waves, different peak ground accelerations and different vertical reinforcement spacing. The results show that waste tires reinforcement can effectively reduce the acceleration magnification of embankment slope. By different reinforcement methods, the crest acceleration magnification of waste tires reinforcement reduces to 32% in Wenchuan wave compared with the pure sand. Along the surface of the slope about 1/3 of the height, the difference of acceleration magnification between the waste tires reinforcement and pure sand slope becomes significant gradually with the increase of height, and the maximum difference reached on the top of the slopes. The vertical spacing between the reinforcement layer is smaller, the smaller the acceleration magnification of soil slope and the better seismic effect. Under various modes of reinforced, the acceleration response of embankment slope is universal, and the rule is consistent with different earthquake waves. Under the same modes of reinforced, acceleration magnification of reinforced slope decreases more obviously when horizontal acceleration is larger. Under different earthquake waves, acceleration response of embankment is different with the same modes of reinforced. The acceleration response produced by Qianan wave is significantly stronger than the other three types of seismic excitation.(2)Based on flac3 d study prime soil and reinforcement embankment slope with spacing 110 mm, 55 mm, 0mm under different intensity Wenchuan earthquake. The results show that slope face play seismic wave amplification effect, with the increasing of embankment height, the response peak of acceleration and displacement increase.The greater the intensity of the earthquake, the more obvious amplification effect of acceleration. Compared with the prime soil, waste tire can effectively block the earthquake transfer, reduce the amplification effect of earthquake acceleration, significantly reduce the extent of damage of soil under earthquake. The tire vertical reinforcement spacing is smaller, the smaller of embankment slope acceleration magnification, the better of the seismic reinforcement effect.(3)Through the contrast of the shaking table test of waste tires reinforced embankment slope and the flac3 d numerical simulation results, the results show that the acceleration responses are the change trend. However the acceleration response of flac3 d is significantly greater than the shaking table test, which may be due to the waste tire and soil be considered as a whole to simulation reinforced layers, but in the fact the soil and waste tire may occur dislocation and distortion. The results of flac3 d and the shaking table test show that the vertical spacing between the reinforcement layer is smaller, the smaller the acceleration magnification of soil slope and the better seismic effect.The results of shaking table test validate that the computational model and parameter selection of FLAC3 D numerical analysis are reasonable.We can use the computational model to study working mechanism and effects of waste tire.