Shaking table test on the dynamic property of solidified ground considering the spatial locality of liquefaction

摘要

In order to evaluate effects of spatial variability of ground improvement on the seismic behavior of improved ground, a series of shaking table tests in 1g gravitational field has been carried out through investigating the seismic behavior of partially improved ground. Following conclusions were obtained: (1) The increase in excess pore water pressure was restrained by the existence of improved element around un-improved element. From the test result in this study, it is suggested that the excess pore water pressure in un-improved area can be greatly reduced as long as 60% of ground is rightly improved enough not to cause liquefaction. (2) Average vertical ground displacement after seismic loading can be greatly reduced, which suggested that partial existence of un-improved area in improved ground is allowable for practical liquefaction countermeasure. (3) An additional effect for reducing ground settlement by the improved element is considered based on the percolation theory.