000018466 001__ 18466
000018466 005__ 20170118182223.0
000018466 04107 $$aeng
000018466 046__ $$k2017-01-09
000018466 100__ $$aNagao, Koichi
000018466 24500 $$aShake Table Tests on Quality Evaluation Procedure for An Unsaturation Method for Liquefaction Countermeasures

000018466 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018466 260__ $$b
000018466 506__ $$arestricted
000018466 520__ $$2eng$$aSince an unsaturation or desaturation construction method for liquefaction countermeasures is inexpensive and simple, its introduction specially to housing sites have been examined after the 2011 off the Pacific coast of Tohoku earthquake. Although the mechanism of injecting air bubbles for unsaturation is almost understood, in-situ quality evaluation procedure of its introduction effectiveness has not been established yet. For the contribution to developing the quality evaluation procedure in situ, the authors conducted a shake-table test of saturated and unsaturated model grounds and performed field investigation by a dynamic cone penetrometer to recognize ground condition before shaking. The test and following consideration in this paper are based on the results of investigation using the dynamic cone penetrometer with a piezo drive cone (PDC) carried out at the experimental site for an unsaturation method and at a model ground in a container. The cone penetration tests obtained excess pore water pressure change and dynamic cone resistance, employed to evaluate the condition and variation of saturation of ground. In addition, the liquefaction behavior observed by accelerometers and pore water pressure transducers during shaking in the grounds is compared. Throughout the test results, the behavior of excess pore pressure change induced by cone penetration in the saturated and unsaturated grounds before shaking is identified. The consideration in this paper indicates the applicability of the quality evaluation procedure based on the mechanism of excess pore water pressure change.

000018466 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018466 653__ $$asaturation condition, dynamic cone penetration, excess pore water pressure, shake table test

000018466 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018466 720__ $$aNagao, Koichi$$iTabata, Kentaro$$iMaeda, Sachio$$iSusami, Ayaka$$iJinguuji, Motoharu$$iNakazawa, Hiroshi
000018466 8560_ $$ffischerc@itam.cas.cz
000018466 8564_ $$s1441980$$uhttps://invenio.itam.cas.cz/record/18466/files/1509.pdf$$yOriginal version of the author's contribution as presented on USB, paper 1509.
000018466 962__ $$r16048
000018466 980__ $$aPAPER