Yuuki Yamaguchi
Vibration table model experiment concerning unequal settling of residential foundation by liquidizing
Satoru Otsuka and Koichi Isobe
Damage in the stratum boundaries such as the low grounds (dune hinterland) between the dune and the dune
and deltas has expanded in Chuetsu and the Chuetsu coast earthquake. In the present study, it aims to clarify
the mechanism of the unequal settling of the detached house by liquidizing in the vicinity of the stratum boundary,
and to examine, and to propose the liquidizing measures worker that is appropriate for the detached house. Moreover,
because the Shinano river that flows Niigata inside a prefecture is wider than present width of a rivers, repeats
the flood on countless occasions, and has been done the reclamation construction for the flood control on countlessoccasions,
Chuetsu coast earthquake see Kashiwazaki Ichimatsu wave apartment of a housing complex kariwa son housing lot ground
large-scale liquidize detached house unequalsettling future generation worryabout Nagaoka plains west edge fault belt epicenter
do earthquake large-scale generate possibility high presentstudy social meaning very high especially Chuetsu region role large.
The non-liquidizing ground of the relative density 100% was made for the experiment soil tank by the underwater fall method by
using the sand having been gathered by the Kariwa-son. And, the liquidizing ground of the relative density 30% and 10% compared
with the included water was made by the soil compaction method. 1/40 of the real models is assumed, and the model ground and the
house model are made. The sine wave of 8Hz 32 wave and 600 gallons of the Chuetsu coast earthquake corresponding were excited.
As a result, the shearing resistance power of the ground decreases by exciting a water level high, loose sand deposit, and the
ground is liquidized. The house model on the liquidized ground attenuates. Relative density Dr = As for the model on the ground
of 100%, the amplification of the response acceleration spectrum is remarkable though the subsidence phenomenon by liquidizing
is not generated. The dependence of strangeness in the housing lot ground should also raise strength of the house for this case.
The pore water pressure tends to decrease in the ground where [noa] of the house model hangs while exciting it momentarily.
A relative distance of the house model and the inclining non-liquidizing layer gives the unequal settling the influence.
Dissimilarity relatively subsides to the house model if the house model is parallel to non-liquidizing layer.
When the eccentric load hangs to the house model, the eccentric load influences direction where the house model inclines. The finding was obtained.
Please use "previous botton" to return the previous page