No abstract

In the program, dynamic experiments were carried out on two scale models of the recycled tires-asphalt sands (RT-AS) base isolation device. The device consists of recycled tires and the mixture of asphalt and sand at the ratio of 3:1 in weight. Since the tires consists of rubber, the elastic deformation can consume energy, and for asphalt-sands , the friction between sands and the elastic deformation of the mixture of asphalt-sands can also consume energy, RT-AS base isolation device can help the superstructure consume part of energy from seismic wave. In this way, the device can not only can protect environment through recycling worn tires, but isolate the structure from the shaking ground and decrease the damage to the superstructure. To investigate the effectiveness of a new seismic isolation device (RT-AS),two scale models of one-storied masonry structure were built up according to the ratio of 1:12. During the experiment, The WE-Z30 Precise Mini-seismic Shaking Table System was employed with the seismic wave of the earthquake in Wen Chuan in 2008 according to the record of NS direction of Shifang seismographic observatory, The experiment was conducted under three level of vibrating load using vibration exciter, and the positive effect of RT-AS device on reducing the acceleration response of the building was discussed.

The purpose of the study is to implement a new model based on the Navier-Stokes equations for the characterization of landslide sediments interacting with a moving fluid. The model is implemented by combining Hypermesh, the LS-DYNA software and MATLAB. The results show that the main factors affecting the permeability of landslide sediments are the genetic mechanism, the structure and composition of materials, material lithology, and stress. The characteristics and mechanism of permeability changes are determined by adjusting the water levels of fluids. It is found that the permeability of landslide sediments increases at the front and decreases in the middle and at the rear of the considered domain. The magnitude of the internal flow for the whole system decreases first and then increases with a change in the water level during seepage.