A RATIONAL ANALOGY FOR SURFACE DEPOSIT RUPTURING PROBLEM

抄録

The 1999 ChiChi-Taiwan and Kocaeli-Turkey earthquakes, did great damage to a number of bridges along the trace of the surface rupture. With fault motion and induced deformation on surface deposit, consequently an embedded foundation will be shifted from its original location, and deformed even though it is located off the major rupture zone. Understanding the important factors of soft surface deposit shearing is an essential step for investigating its effect on the adjacent structure. In this paper with considering nonlinearity nature of problem, a simple conceptual model is introduced, then essential dimensionless groups are extracted. Using Material Point Method (MPM) together with plasticity, the validity of derived groups are checked by 2D numerical case studies. The derived similarity law is useful for understanding the effect of factors like elastic, strength distribution among depth and deposit thickness. Then the effects of horizontal and vertical fault motion are separately studied and later with proposed framework the effect of material dilatancy, initial stress, Normal-Reverse type and dip fault motions are explained.