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Port Island

100

80

60

40

20

06004002000

PGA (cm/s2)6004002000

150

100

50

0

PGA (cm/s2) PGV (cm/s)

150

100

50

0150100500

Port Island Port Island

(a) =>��?PI&O

PGA (cm/s2)

50

40

30

20

10

04003002001000

Tonankai

100806040200

50

40

30

20

10

0

PGV (cm/s)4003002001000

100

80

60

40

20

0

PGA (cm/s2)

TonankaiTonankai

(b) ����?PD�&O

PGA (cm/s2)

Tomakomai50

40

30

20

10

04003002001000 50403020100

50

40

30

20

10

04003002001000

50

40

30

20

10

0

PGA (cm/s2) PGV (cm/s)

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Tomakomai

Time at PGA (s)

Port Island

1050

10

5

0

Time at PGA (s)

Tonankai250

200

150

100

50

0250200150100500

Time at PGA (s)

80

60

40

20

0806040200

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TomakomaiPort Island

Time at phase t. (s)

10

5

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Time at phase t. (s)

Tonankai250

200

150

100

50

0250200150100500

80

60

40

20

0806040200

Time at phase t. (s) '9( ��e������^��q

Tomakomai

Time at PT (s)

Port Island

10

5

01050

Time at PT (s)250200150100500

250

200

150

100

50

0

Time at PT (s)806040200

80

60

40

20

0

Tonankai

'10( ��rst23e��������^��q

Page 11: ˘ˇˆ˙˝ - jaee.gr.jpHZJKŽfV‘:L‡‡aW (2)aHƒgºìíî—ïIôdUg—HÆâ7Æ»T Þ

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Liquefy Nonliquefy

Port Island0.6

0.4

0.2

0.0

Number of cycles6543210

0.6

0.4

0.2

0.0

Liquefy Nonliquefy

Tonankai

706050403020100Number of cycles

Liquefy Nonliquefy

Tomakomai0.6

0.4

0.2

0.0

Number of cycles403020100

600

400

200

0

5040302010

0

150

100

50

0

Liquefy Nonliquefy

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Page 12: ˘ˇˆ˙˝ - jaee.gr.jpHZJKŽfV‘:L‡‡aW (2)aHƒgºìíî—ïIôdUg—HÆâ7Æ»T Þ

�39�

Average Std. dev.

Port Island

Ground number

2.0

1.5

1.0

0.5

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Average Std. dev.

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Ground number250200150100500

2.0

1.5

1.0

0.5

0.0

Average Std. dev.

2.0

1.5

1.0

0.5

0.0

Tomakomai

250200150100500Ground number

(a) ����|��|� 2.0

1.5

1.0

0.5

0.0

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Ground number250200150100500

Average Std. dev.

2.0

1.5

1.0

0.5

0.0

Ground number250200150100500

Tonankai Average Std. dev.

Average Std. dev.

Tomakomai

Ground number250200150100500

2.0

1.5

1.0

0.5

0.0

(b) }~{�|�

Average Std. dev.

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1.5

1.0

0.5

0.0250200150100500

Ground number

2.0

1.5

1.0

0.5

0.0

Average Std. dev.

Tonankai

Ground number250200150100500

Average Std. dev.

Port Island

Ground number

3

2

1

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(c) yz{�|�

3

2

1

0

Ground number250200150100500

Average Std. dev.

Port Island Average Std. dev.

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Ground number

4

3

2

1

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Tomakomai Average Std. dev.

Ground number

4

3

2

1

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Page 13: ˘ˇˆ˙˝ - jaee.gr.jpHZJKŽfV‘:L‡‡aW (2)aHƒgºìíî—ïIôdUg—HÆâ7Æ»T Þ

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Depth

(m)

SoilType

Vs

(m/s)

gt

(kN/m3)

Max. Excess PWP

100 200

Max. Stress(kPa)

20 40 60

(kPa)

19.1

19.1

20.1

20.6

19.1

17.1

18.1

18.1

18.117.119.1

190.5

145.4

141.2

225.8

166.4

127.0

217.2

172.4

220.7217.2294.7

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5.5

7.8

9.2

12.813.2

15.0

16.8

18.118.919.520.5

Depth

(m)

SoilType

Vs

(m/s)

gt

(kN/m3)

Max. Stress(kPa)

50 100

Max. Excess PWP

100

(kPa)50 150

17.6

18.620.619.618.6

19.6

18.619.1

19.1

19.620.6

19.6

20.6

19.6

144.2

160.0233.9251.3220.7

230.8

209.7256.6

227.5

328.4352.7

298.6

371.3

364.6

0.5

2.12.8

3.64.04.44.75.8

7.17.7

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12.8

14.815.2

Site 1

Site 77

Depth

(m)

SoilType

Vs

(m/s)

gt

(kN/m3)

Max. Stress(kPa)

20 40 60 80 100

Max. Excess PWP

100

181.6

271.3

19.6

18.6

0.5

2.0

9.9

12.1

13.7

15.5

17.9

(kPa)50 150

Depth

(m)

SoilType

Vs

(m/s)

gt

(kN/m3)

Max. Stress(kPa)

20 40 60 80

Max. Excess PWP

100

17.1

19.1

19.1

20.1

18.6

145.4

177.9

224.2

271.3

294.7

0.9

1.82.7

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£¤¥¦ 1) ;<=8`�H�5h��!�[¸çj>18�5h����2004�513pp. 2) ./ëìa� (2002): ëìíî�ï!µs? V b6�äc� (d)./ëìa� 3) ./�e��é2001ù¹�eAðÉÊ�äçè�2001õf 4) ghiñëìjk�ñë��ÜÝ#$-cé1999ù¹ñëÉÊËò�äóô!µs? b6�ä�lö

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8) %&#$-�}%~½#$�mkjé1996ù¹hij��567Ò�:;<=!§;<=XY7AB`g;<=FGHT��Ù7�9:CD��ï

9) http://www.k-net.bosai.go.jp/k-net/quake/ 10) ;<=Ö++>�!ÍÎH\�äH7�9:¸mk�,�½þl�5h����1999�pp. 23-

24 11) 5h���é2000ù¹%«±²T�H\s?��Ú®õf���902pp. 12) 5hT5�st�Að�¡epdÀa��5h��!Að�¸çj>2�5h����2007�

152pp. 13) Hatanaka, M. and Uchida, A. (1996): Empirical correlation between penetration resistance and internal friction

angle of sandy soils, Soils and Foundations, Vol. 36, No. 4, pp. 1-9 14) %«���¹N|ÒÓÔ c!��¬­�\�dH��%«����1992�211pp. 15) Ishihara, K. and Takatsu, H. Effects of overconsolidation and K0 conditions on liquefaction characteristics of

sands, Soils and Foundations, Vol. 19, No. 4, pp. 597-682, 1979. 16) Seed, H. B., Idriss, I. M. and Arango, I (1981): Evaluation of liquefaction potential using field performance data,

J, of GT, Vol. 109, No. 3, pp. 458-482 17) ãa� ���x�¨��Ú�"��é1978ù¹·«5hT56R�5=TDEFGH\ÉdY��5®./56��¸mk�,�l�pp. 461-468

18) 5h���é1999ù¹;<=\8`�5h���m¸��.�5céL�,¼!��òó\8`ù 19) "����m�Ú������ m�@é1993ù¹SI|Id`g;<=ÍÎPH��28®%«��#$½þ��pp. 1325-1328

20) 12�u�"����������xé1998ù¹5hT56R¿]ûpqTDE´GH�%&��l�No. 610/III-45�pp. 83-96

21) Orense, R. P. (2005): Assessment of liquefaction potential based on peak ground motion parameters, Soil Dynamics and Earthquake Engineering, Vol. 25, pp. 225-240

22) ��ã����� �����%�oÞé2000ù¹565Tøþ|\5hT¿]û±�T�°�%&��l�No. 654/I-52�pp. 195-206

23) ���é2008ù¹5hT56R§�Çû5TÞ�\ÍÎ�56��#$�kj��No. 105��)�����pp. 35-47

24) ª#��"��é1975ù¹;<=7�¥9566Tåæ�Ù\�O ¡�T���%\Að�Vol. 23�No. 6�pp. 29-35

25) Þ�¼��������� �¡�¢�é1994ù¹1993b£ìe567Ó:Ê]5̼7�9:st�����9®./56��¸mk�,��pp. 763-768

26) P�¤¥é1993ù¹î¦56é1964bù7ÓvVJ§�fg¨óWsËa�g¡©�:5�ªÕ«�i#"+�¸ym��e¬­�Vol. 108, No. 1338, p.72

27) Seed, H. B. and Idriss, I. M. (1971): Simplified procedure for evaluating soil liquefaction potential, ASCE Journal of the Soil Mechanics and Foundations Division, Vol. 97, No. SM9, pp. 1249-1273

28) Schnabel, P. B., Lysmer, J. and Seed, H. B. (1972): SHAKE A Computer program for earthquake response analysis of horizontally layered sites, Report No. EERC72-12, University of California, Berkeley

é.�¹2008b8®27.ù é¯�ËG¹2009b4®9.ù

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Simplified procedure for evaluating liquefaction potential under ocean trench type long period earthquake

YOSHIDA Nozomu1)�OHYA Yousuke2), SAWADA Sumio3)�NAKAMURA Susumu4)

1) Member, Professor, Tohoku Gakuin University, Dr. Eng. 2) Member, Post graduate student, Tohoku Gakuin University

3) Member, Professor, Kyoto University, Dr. Eng. 4) Member, Professor, Nihon University, Dr. Eng.

ABSTRACT A simplified method for evaluating liquefaction potential under ocean trench type long period earthquakes. Since there is no experience on damage or liquefaction under this type of earthquake, effective stress analyses are made on more than 200 sites that are used in the past investigation on liquefaction damage. Accuracy or effectiveness of existing simplified methods is investigated, and is found that they are applicable to near field earthquake, but they result in dangerous evaluation under ocean trench type earthquakes such as artificial earthquake for coming Tonankai earthquake and recorded accelerogram during the Tokachi-oki earthquake of 2003. The reason is found to be effective number of loading cycles; it is about 10 times larger than that considered in the existing simplified procedure. Then a correction factor for liquefaction strength is proposed in order to evaluate liquefaction potential under this type of earthquakes. The factor is a half of the factor in the existing method; liquefaction strength is to be half of the conventional value when comparing maximum shear stress to evaluate FL value. This method works so that dangerous ratio (ratio of number of layers where onset of liquefaction is identified under effective stress analysis but is not identified under existing simplified procedure to the total number of layers) becomes small to be the same order under near field earthquake.

Key Words: Liquefaction, Simplified procedure, effective cycles, ocean trench type earthquake, near field earthquake