土木学会論文集Ｃ Vol.62 No.2, 471-487, 2006. 5

ๆ᳓ߦࠃࠆࠨ࡚ࠢࠪࡦߩᶖᄬ߇ૐ᜔᧤࿶ਅߩ
☼࿯ߩߖࠎᢿᒝᐲ․ᕈߦਈ߃ࠆᓇ㗀ട⮮ᱜม1࡮⼘↰ቁብ2࡮ᣂᶏඳਯ31ᱜળຬ ␹ᚭᄢቇഥᢎ᝼ Ꮏቇㇱᑪ⸳ቇ⑼㧔‫ޥ‬657-8501 ␹ᚭᏒἥ඙౐↲บ↸1-1㧕

E-mail:skato@kobe-u.ac.jp2ᱜળຬ ࿾ၞ࿾⋚ⅣႺ⎇ⓥᚲ ࿾⋚⸃ᨆࠣ࡞㧙ࡊ㧔‫ޥ‬550-0012 ᄢ㒋Ꮢ⷏඙┙ᄁၳ4-3-2㧕
3ᱜળຬ ᧲㇌ࠟࠬ ㇺᏒࠛࡀ࡞ࠡ࡯༡ᬺㇱ㧔‫ޥ‬456-8511 ฬฎደᏒᾲ↰඙᪉↰↸19-18㧕 ᧄ⎇ⓥߢߪ㧘㘻๺࡮ਇ㘻๺⁁ᘒߩࠞࠝ࡝ࡦ੍࿶ኒ⹜ᢱ෸߮ਇ߆ߊੂᴒⓍ☼࿯⹜ᢱࠍ↪޿ߡ㧘࿶❗࡮㒰⩄ᓟ㧘ߥࠄ߮ߦߘࠇߦๆ᳓ㆊ⒟ࠍട߃ߚ╬ᣇ࿶❗ㆊ⒟ᓟߩૐ᜔᧤࿶ਅߢߩ㕖ឃ᳓ߖࠎᢿ⹜㛎ࠍታᣉߒߚ㧚ߘߒߡ㧘⎕უߦ⥋ࠆ߹ߢߩ᦭ലᔕജ⚻〝㧘ߥࠄ߮ߦࡇ࡯ࠢᒝᐲ߿ᱷ⇐ᒝᐲߦᬌ⸛ࠍട߃ߚ㧚ߘߩ⚿ᨐ㧘ࡇ࡯ࠢᒝᐲ․ᕈ߿᦭ലᔕജ⚻〝ߦߪ㧘ࠨ࡚ࠢࠪࡦߦࠃࠆᒙ޿☸ሶ㑆ઃ⌕ജ߿㐳ᦼߩၸⓍㆊ⒟ߦࠃࠅᒻᚑߐࠇ㧘᭴ㅧࠍ↢ߓࠆᒝ޿☸ሶ㑆ઃ⌕ജ߇ᓇ㗀ߔࠆ௑ะ߇⹺߼ࠄࠇߚ㧚߹ߚᱷ⇐ᒝᐲ․ᕈߪ㧘ࠨ࡚ࠢࠪࡦᔕജࠍ⠨ᘦߒߚᐔဋၮᐩਥᔕജߦࠃࠅ㘻๺࡮ਇ㘻๺⁁ᘒߦ߆߆ࠊࠄߕ࡙࠾࡯ࠢߦᢛℂߐࠇࠆ௑ะࠍ␜ߒߚ㧚ߐࠄߦ㧘
ๆ᳓ㆊ⒟ߦࠃࠅࠨ࡚ࠢࠪࡦ߇ᶖᄬߔࠆ႐วߩߖࠎᢿᒝᐲૐਅ㊂ߩ੍᷹ᣇᴺߦߟ޿ߡᬌ⸛ࠍട߃ߚ㧚

Key Words : wetting process, shear strength, residual strength, suction, low confining pressure

1. ߪߓ߼ߦ

࡚ࡦߩᷫዋ࡮ᶖᄬߩߚ߼ᒝᐲૐਅࠍ↢ߓߡ޿ࠆߎߣ
ߦߥࠆ㧚ߒ߆ߒ㧘ߤߩ⒟ᐲߩᒝᐲૐਅࠍ↢ߓࠆ߆㧘 ᢳ㕙⴫ጀㇱߩ࿾⋚ߪਇ㘻๺⁁ᘒߣߥߞߡ޿ࠆ႐ว
߹ߚ㧘ߘߩᒝᐲૐਅᓟߩ࿯ߩߖࠎᢿ․ᕈߦ㑐ߒߡߪ߇ᄙߊ㧘ߘߩജቇ․ᕈߪࠨ࡚ࠢࠪࡦߩᓇ㗀ࠍฃߌߡᧂ⸃᣿ߥὐ߇ᄙ޿㧚ߎࠇࠄߩὐ߇⸃᣿ߐࠇࠇ߫㧘ជ޿ࠆ߽ߩߣ⠨߃ࠄࠇࠆ㧚߹ߚ㧘⥄ὼᢳ㕙ߦሽ࿷ߔࠆ
೥ᤨߦᣉᎿߐࠇࠆ࿯⇐߼Ꮏߥߤߩታോ⸳⸘ߦ߅޿ߡ㧘ፗ㍙ၸⓍ‛ߩ႐วߪ㧘㑆㓗Ყ߇ᄢ߈޿㧘ࠁࠆ޿࿯᭴
᦭↪ߥᖱႎߣߥࠆ߽ߩߣ⠨߃ࠄࠇࠆ㧚ㅧࠍᜬߟ႐ว߇޽ࠆ㧚ߎߩߚ߼㧘⽕㔎ᤨߦߪࠨࠢࠪ ᧄ⎇ⓥߢߪ㧘ਃゲ࿶❗⹜㛎ⵝ⟎ࠍ↪޿ߡ㧘੍࿶ኒ࡚ࡦߩᶖᄬߩᓇ㗀ߦࠃࠅࠁࠆ޿࿯᭴ㅧ߇፣უߒ㧘ߎ☼࿯⹜ᢱߥࠄ߮ߦਇ߆ߊੂ☼࿯⹜ᢱߦߟ޿ߡ㧘╬ᣇࠇ߇ᢳ㕙ో૕ߩ፣უේ࿃ߩ৻ߟߣߥߞߡ޿ࠆߎߣ߇
࿶❗㧘㒰⩄㧘ๆ᳓ㆊ⒟ࠍታᣉߒ㧘ૐ᜔᧤࿶ਅߢߩ㕖1㧕ផ᷹ߐࠇߡ޿ࠆ 㧚ߎߩ᭽ߥ⃻⽎ߪ㧘ਇ㘻๺⁁ᘒߩឃ᳓⁁ᘒߩߖࠎᢿ⹜㛎ࠍⴕߞߚ㧚ߘߒߡ㧘㒰⩄ᤨߦ᦭ߔࠆࠨ࡚ࠢࠪࡦ㧘ߥࠄ߮ߦๆ᳓ㆊ⒟ߦࠃࠆࠨࠢࠪ
ࠁࠆ޿᭴ㅧࠍᜬߟ࿯ߩ㧘ᶐ᳓ߦࠃࠆᒝᐲૐਅ໧㗴ߥ࡚ࡦߩᄌൻ߇㧘ૐ᜔᧤࿶ਅߦ߅ߌࠆߖࠎᢿᒝᐲ․ᕈ
ࠄ߮ߦࠦ࡜ࡊࠬ㧔ᶐ᳓ᤨߩ૕Ⓧ࿶❗⃻⽎㧕໧㗴ߣߒ
2 㧕 ,3 㧕ߡᝒ߃ࠄࠇ㧘ᓥ᧪,ᄙߊߩ⎇ⓥ߇ߥߐࠇߡ޿ࠆ㧚 ߦਈ߃ࠆᓇ㗀ߟ޿ߡᬌ⸛ࠍട߃ߚ㧚วࠊߖߡ㧘ๆ᳓ߦࠃࠆᒝᐲૐਅ㊂ߩផቯᣇᴺߦ㑐ߒߡᬌ⸛ࠍⴕߞߚ㧚৻ᣇ㧘ㇺᏒㇱߦ߅ߌࠆ࿾ਛ᭴ㅧ‛߅ࠃ߮ߘߩၮ␆ ߥ߅㧘એਅߢߪ․ߦᢿࠄߥ޿㒢ࠅ㧘ᰴߩᔕജ⸥ภ
ߩᑪ⸳ߩߚ߼ߩជ೥Ꮏ੐ߩ㓙ߦߪ㧘ជ೥࿾⋚ߩ⴫㕙ࠍ↪޿ࠆ㧚ઃㄭߪ㒰⩄ࠍฃߌߚ⁁ᘒߣߥࠆ㧚ជ೥㕙߇࿾ਅ᳓૏
 V1㧘V㧞㧘V㧟㧧ోᔕജ⴫␜ߩਥᔕജ㧘એਅߩ႐วߦߪ㧘㊍႐ឃ᳓ߥߤߩ࿾ਅ᳓ಣℂ߇ⴕߥࠊࠇ㧘ជ೥࿾⋚⴫㕙ߪ㘻๺ߦㄭ޿ਇ㘻๺⁁ᘒߢ㒰⩄ V c㧧╬ᣇ࿶❗ㆊ⒟ߢߩ࿶❗ᔕജ㧘ࠍฃߌࠆ㧚ߐࠄߦ㧘࿾ਅ㋕Ꮏ੐ߥߤߢ㐿೥Ꮏ੐߇ⴕ
ua㧘uw;㑆㓗ⓨ᳇࿶߅ࠃ߮㑆㓗᳓࿶㧘ࠊࠇࠆᤨߦߪ㧘ជ೥ߐࠇߚ࿾⋚⴫㕙ߪ㔎᳓ߥߤߩଏ
 V i㧙ua;ၮᐩਥᔕജ㧔i =1,2,3㧕5㧕,⛎ࠍฃߌࠆ㧚ߎߩᤨ㧘ជ೥㕙ઃㄭߩ࿾⋚ߪๆ᳓ߦࠃ 㨟㧩ua㧙uw㧧ࠨ࡚ࠢࠪࡦ㧘
4㧕ࠅᒝᐲૐਅࠍ↢ߓࠆ႐ว߇޽ࠆ 㧚ߎߩ᭽ߥࠤ࡯ࠬ p㧩㧔V 1+V㧞+V㧟㧕/3㧧ᐔဋਥᔕജ㧘ߢߪ㧘ၸⓍߦࠃࠅ↢ᚑߐࠇߚኒߥ࿯᭴ㅧࠍ᦭ߔࠆ࿯ p̉㧩p㧙uw㧧ᐔဋ᦭ലਥᔕജ㧘߇㧘㘻๺ߦㄭ޿ਇ㘻๺⁁ᘒߢ㒰⩄ߦࠃࠅ⽶ߩ㑆㓗᳓ pnet㧩p㧙 ua㧧ၮᐩਥᔕജߦࠃࠆᐔဋਥᔕജ㧘࿶㧔ࠨ࡚ࠢࠪࡦ㧕ࠍ↢ߓ㧘ߐࠄߦๆ᳓ߦࠃࠆࠨࠢࠪ
 q㧩V 1㧙V㧟㧧ߖࠎᢿᔕജ㧘471

土木学会論文集Ｃ Vol.62 No.2, 471-487, 2006. 5

 ps

S r  S r0
 s 㧧ࠨ࡚ࠢࠪࡦᔕജ 6㧕㧘ߚߛߒ㧘Sr,
100  S r 0䊜䊆䉴䉦䉴᳓

߹ߚ㧘એ਄ߩᔕജ⸥ภߩ೨ߦ⸥ภ'߇ઃ޿ߚ߽ߩߪ㧘ߘߩᔕജߩᄌൻ㊂ࠍ␜ߔ߽ߩߣߔࠆ㧚

2.ࠨ࡚ࠢࠪࡦᶖᄬ߇ߖࠎᢿᒝᐲ․ᕈߦਈ߃ࠆ
ᓇ㗀

ࠨ࡚ࠢࠪࡦ
䉰䉪䉲䊢䊮

Sr0 ߪ㧘㘻๺ᐲ߅ࠃ߮ᱷ⇐㘻๺ᐲ㧚

ਥឃ᳓ᦛ✢
ਥੇ῎ᦛ✢
ਥੇ῎ᦛ✢

⿛ᩏᦛ✢

ਥḨẢᦛ✢
ਥḨẢᦛ✢
ਥๆ᳓ᦛ✢
䊋䊦䉪᳓

(1) ๆ᳓ㆊ⒟ߦ߅ߌࠆࠨ࡚ࠢࠪࡦߩᄌൻ

ȀA ࿯႙ߩᜬߟࠨ࡚ࠢࠪࡦߣ᳓ಽ㊂ߩ㑐ଥߪ㧘᳓ಽ․ᕈᦛ✢ߣ๭߫ࠇࠆ㧔࿑ෳᾖ㧚ߥ߅㧘࿑ਛߩSr100ߪ㧘㘻๺⁁ᘒߩ㘻๺ᐲࠍ⴫ߔ㧚߹ߚ㧘࿑ਛߩࡔ࠾ࠬࠞࠬ
᳓㧘ࡃ࡞ࠢ᳓ߦ㑐ߒߡߪᢥ₂6)ࠍෳᾖߩߎߣ㧚㧕㘻๺⁁ᘒ߆ࠄࠨ࡚ࠢࠪࡦ߇Ⴧടߔࠆ႐วߣ㧘ࠨ࡚ࠢࠪࡦჇടᓟ㧘ᷫዋߔࠆ႐วߢߪ᳓ಽ․ᕈᦛ✢ߪ⇣ߥࠆᦛ✢ࠍឬ߈㧘ࡅࠬ࠹࡝ࠪࠬࠍ␜ߔ㧚ࠨ࡚ࠢࠪࡦჇട
ᤨߣᷫዋᤨߩ᳓ಽ․ᕈᦛ✢ࠍߘࠇߙࠇ㧘ឃ᳓ᦛ✢߅ࠃ߮ๆ᳓ᦛ✢ߣ๭߱㧚߹ߚ㧘᳓ಽ․ᕈᦛ✢ߩᒻ⁁ߩᄌൻὐߦ߅ߌࠆࠨ࡚ࠢࠪࡦߩ୯ࠍߘࠇߙࠇ㧘ⓨ᳇ଚ౉୯߅ࠃ߮᳓ଚ౉୯ߣ๭߱㧚ߐࠄߦ㧘㘻๺⁁ᘒ߆ࠄߩࠨ࡚ࠢࠪࡦߩჇടㆊ⒟ߣߘࠇߦ⛯ߊᷫዋㆊ⒟ߦࠃ
ࠅᓧࠄࠇࠆ᳓ಽ․ᕈᦛ✢ߪߘࠇߙࠇਥឃ᳓ᦛ✢㧘ਥๆ᳓ᦛ✢ߣ๭߫ࠇ㧘ㅜਛᲑ㓏߆ࠄߩࠨ࡚ࠢࠪࡦߩჇ
ട㧘޽ࠆ޿ߪᷫዋㆊ⒟ߦࠃࠅᓧࠄࠇࠆ᳓ಽ․ᕈᦛ✢ߪ⿛ᩏᦛ✢ߣ๭߫ࠇࠆ㧚ߥ߅㧘᳓ಽ․ᕈᦛ✢ߩᒻ⁁ߦ㑐ߒߡߪ㧘㑆㓗Ყ㧘࿯᭴ㅧߥࠄ߮ߦᔕജ⁁ᘒߩᄌൻ߇ᓇ㗀ࠍ෸߷ߔߎߣ߇⍮ࠄࠇߡ޿ࠆ7㧕㧘8㧕㧘9㧕㧚 㘻๺⁁ᘒߦ޽ࠆ࿾⋚ߩ࿾⴫㕙ࠍជ೥ߒߚ႐ว㧘ᔕജߩ㒰⩄ߦࠃࠅ⽶ߩ㑆㓗᳓࿶㧔ࠨ࡚ࠢࠪࡦ㧕ࠍ᦭ߒߚ⁁ᘒߣߥࠆ㧚ߘߩᓟ㧘㔎᳓ߥߤߩଏ⛎ࠍฃߌߡ⽶ߩ㑆㓗᳓࿶߇ᷫዋ࡮ᶖᄬߔࠆ႐วߦߪ㧘⽶ߩ㑆㓗᳓࿶ߢቯ⟵ߐࠇࠆࠨ࡚ࠢࠪࡦߣ᳓ಽ㊂ߩ㑐ଥߪ㧘⿛ᩏᦛ✢ࠍ⚻ߡਥๆ᳓ᦛ✢਄ࠍ⒖േߔࠆߎߣ߇੍ᗐߐࠇࠆ㧚 ࠨ࡚ࠢࠪࡦᶖᄬߦࠃࠆߖࠎᢿᒝᐲߩૐਅ ࿯႙ߦࠨ࡚ࠢࠪࡦ߇૞↪ߔࠆߣ㧘ࡔ࠾ࠬࠞࠬߦࠃ
ࠅ↢ߓࠆ☸ሶ㑆ઃ⌕ജߩߚ߼㧘࿯☸ሶ㑆ߩ៺ᡂᛶ᛫
߇Ⴧᄢߒ㧘ߖࠎᢿᒝᐲ߇Ⴧടߔࠆ㧚Fredlund et al. 10)ߪ㧘ਇ㘻๺࿯ߩߖࠎᢿᒝᐲࠍ⴫ߔᑼߣߒߡᰴᑼࠍឭ
᩺ߒߡ޿ࠆ㧚

Sǰr
r0

ǰs

૕Ⓧ฽᳓₸
㘻๺ᐲ
૕Ⓧ฽᳓₸

Sr100

࿑ ᳓ಽ․ᕈᦛ✢ߩ᭎ᔨ࿑     Inet㧦ၮᐩᔕജߦၮߠߊౝㇱ៺ᡂⷺ㧘     Ib㧦ࠨ࡚ࠢࠪࡦߩჇടߦ઻߁ߖࠎᢿᒝᐲ
ߩჇടࠍ⴫ߔࡄ࡜ࡔ࡯࠲࡯㧘       㧔ua 㧙 uw 㧕tanIb  ߩ㗄ߪ㧘ࠨ࡚ࠢࠪࡦߦࠃࠆ☼⌕ജჇಽࠍ⴫ߔ㧚߹ߚ㧘I㨎ߩᄢ߈ߐߪ㧘ࠨ࡚ࠢࠪࡦߩᄢ߈ߐ߇ⓨ᳇ଚ౉୯એਅߩ႐ว㧘 I㨎 㧩 Inet ߣߥࠅ㧘ⓨ᳇ଚ౉୯ࠃࠅ߽ ᄢ ߈ ߊ ߥ ࠆ ߣ I 㨎 㧨 Inet ߣ ߥ ࠆ 11) 㧚 㒙 ㇱ 12 㧕 㧘Vanapalliࠄ13㧕ߪ㧘ࠨ࡚ࠢࠪࡦߦࠃࠆߖࠎᢿᒝᐲჇಽ
ࠍ᳓ಽ․ᕈᦛ✢߆ࠄផቯߔࠆᣇᴺߦߟ޿ߡᬌ⸛ߒߡ
޿ࠆ㧚߹ߚ㧘Vanapalliࠄ13㧕߅ࠃ߮シㇱࠄ6㧕ߪ㧘ࠨ࡚ࠢࠪࡦߦࠃࠆߖࠎᢿᒝᐲჇಽ'Wfߣ㘻๺ᐲߩ㑐ଥࠍ␜ߒߡ޿ࠆ㧚ߘࠇࠄߪ㧘ᰴᑼߩࠃ߁ߦ߹ߣ߼ࠄࠇࠆ㧚'W f§ Sr  Sr 0 ·¨¨
 s ¸¸ tan Inet    (2)© 100  S r 0 ¹

ๆ᳓ㆊ⒟ߢ↢ߓࠆࠨ࡚ࠢࠪࡦߩᷫዋ߿ᶖᄬߦࠃࠆߖ
ࠎᢿᒝᐲૐਅࠍ⠨߃ࠆ႐ว㧘ๆ᳓ࠍ↢ߓࠆ೨ᓟߩ㘻๺ᐲߣࠨ࡚ࠢࠪࡦ߇ಽ߆ࠇ߫㧘ᑼ(2)ࠍ↪޿ߡࠨࠢࠪ
࡚ࡦᶖᄬߦࠃࠆߖࠎᢿᒝᐲૐਅ㊂ࠍ੍᷹ߔࠆߎߣ߇
น⢻ߣ⠨߃ࠄࠇࠆ㧚ߒ߆ߒ㧘ᓥ᧪㧘᳓ಽ․ᕈᦛ✢ߣࠨ࡚ࠢࠪࡦߦࠃࠆߖࠎᢿᒝᐲჇಽߩ㑐ଥߦ㑐ߔࠆ⎇ⓥߦ߅޿ߡߪ㧘ߘߩᄙߊ߇ࠨ࡚ࠢࠪࡦჇടᣇะߩឃ
᳓ᦛ✢ߦ㑐ߔࠆታ㛎ߦၮߠ޿ߡ⎇ⓥ߇ⴕࠊࠇߡ߈ߚ㧚ߎߩߚ߼㧘ࠨ࡚ࠢࠪࡦᷫዋᣇะߩๆ᳓ᦛ✢ߦ㑐ߒߡߪ㧘ᑼ㧔2㧕ߩㆡ↪ᕈ߽฽߼ߡචಽߥᬌ⸛߇ⴕࠊࠇ
ߡ޿ߥ޿ߩ߇⃻⁁ߢ޽ࠆ㧚

Wf = csat + (V㧙ua)tanInet㧗㧔ua㧙uw㧕tanIb (1)(3) ࠨ࡚ࠢࠪࡦᶖᄬᤨߩߖࠎᢿᒝᐲ․ᕈ

ߎߎߦ㧘Ǽf㧦⎕უ㕙਄ߩߖࠎᢿᒝᐲ㧘     V㧧ోᔕജ⴫␜ߩ⎕უ㕙਄ߩု⋥ᔕജ㧘     csat㧦㘻๺⁁ᘒߦ߅ߌࠆ☼⌕ജ㧘ਇ㘻๺࿯ߩᶐ᳓ᤨߩ᜼േߦ㑐ߒߡߪ㧘ࠦ࡜ࡊࠬࠍ
ਛᔃߣߒߚ૕Ⓧᄌൻ᜼േߦߟ޿ߡਥߦ⎇ⓥ߇ߥߐࠇ

472

土木学会論文集Ｃ Vol.62 No.2, 471-487, 2006. 5

200

Critical state line

KaolineAlluvialclay

U㨟 (g/cm3)

2.709

2.545

w㨜(%)

33.5

27.8

wL (%)

20.3

62.4

Ip (%)

13.2

34.6

Yield surface
100
Percent passing by weight (%)

Deviator stress q (kPa)⴫ ⹜ᢱߩ‛ℂ⊛ᕈ⾰Stress path
0

0

100

200

Mean effect ive st ress p' (kP a)࿑ ߖࠎᢿᔕജ৻ቯ᧦ઙਅߩ㑆㓗᳓࿶਄᣹⹜㛎ߢߩ᦭ലᔕജ⚻〝㧔ᢥ₂ 16㧕ਛߩ࿑㕙ࠍୃᱜ㧕2㧕

ߡ߈ߚ 㧚৻ᣇ㧘ᶐ᳓ߦࠃࠆᒝᐲૐਅߦ㑐ߒߡ߽޿ߊߟ߆ߩ⎇ⓥ߇ߥߐࠇߡ޿ࠆ㧚⑔↰ 3) ߪ㧘৻㕙ߖࠎᢿ⹜㛎ⵝ⟎ࠍ↪޿ߚታ㛎ߦࠃࠅ㧘ㆊ࿶ኒ⁁ᘒߩ࿯ߦߟ޿ߡᶐ᳓ߦࠃࠆᒝᐲૐਅߦߟ޿ߡᬌ⸛ࠍⴕߞߡ޿
ࠆ㧚߹ߚ㧘ቝ㊁࡮ችਅ14)߅ࠃ߮㒙ㇱ15)ߪ㧘✦࿕߼࿯ߩೋᦼੇ῎ኒᐲߦ⌕⋡ߒߡ㧘ᶐ᳓ᤨߩᒝᐲૐਅߦߟ
޿ߡ⠨ኤࠍⴕߞߡ޿ࠆ㧚ߒ߆ߒ㧘ߎࠇࠄߩ⎇ⓥߦ߅޿ߡߪ㧘ࠦ࡜ࡊࠬࠍ↢ߓߐߖࠆߚ߼ߦ㜞޿᜔᧤ᔕജ
ߩਅߢߩᶐ᳓⹜㛎ࠍⴕߞߡ޿ࠆ㧚ߘߒߡ㧘ᶐ᳓ᤨߩࠨ࡚ࠢࠪࡦᷫዋ࡮ᶖᄬߦࠃࠆᒝᐲૐਅ㊂ߦ㑐ߒߡߪࠦ࡜ࡊࠬߦࠃࠆ㑆㓗Ყᄌൻߩᓇ㗀߽฽߹ࠇߡ߅ࠅ㧘ᧄ⎇ⓥߢขࠅ਄ߍߡ޿ࠆࠃ߁ߥ㧘ૐ᜔᧤࿶ਅߩๆ᳓
ㆊ⒟ߢߩࠨ࡚ࠢࠪࡦᷫዋ࡮ᶖᄬߩߺߦࠃࠆߖࠎᢿ․ᕈ߳ߩᓇ㗀ࠍᬌ⸛ߒߚ߽ߩߢߪߥ޿ߣ⠨߃ࠄࠇࠆ㧚 ๆ᳓ߦࠃࠅ᦭ലᔕജ⚻〝߇ߤߩࠃ߁ߥᓇ㗀ࠍฃߌࠆ߆ࠍᛠីߔࠆߎߣߪ㧘ᶐ᳓ߦࠃࠆᢳ㕙፣უࡔࠞ࠾
࠭ࡓߥߤࠍᬌ⸛ߔࠆ਄ߢ㊀ⷐߢ޽ࠆ㧚ᄢႦࠄ 16 㧕 ߪ㧘⽕㔎ߦࠃࠅ↢ߓࠆᶐ᳓ᤨߩᒝᐲ․ᕈߦߟ޿ߡ⺞ߴࠆߚ߼ߦ㧘✵ࠅ㄰ߒߚ☼࿯⹜ᢱࠍ↪޿ߚਃゲ࿶❗⹜㛎ߦ߅޿ߡ㧘ߖࠎᢿᔕജ৻ቯ᧦ઙਅߦ߅ߌࠆ㑆㓗᳓࿶Ⴧട⹜㛎ࠍⴕ޿㧘ᓧࠄࠇߚ᦭ലᔕജ⚻〝ߦߟ޿ߡᬌ
⸛ࠍട߃ߡ޿ࠆ㧚ߘߒߡ㧘࿑ߦ␜ߔࠃ߁ߦ㧘᦭ലᔕജ⚻〝߇㒢⇇⁁ᘒ✢㧔Critical state line㧕ࠍ⿧߃ߚᤨὐ߆ࠄ㧘ㆊ࿶ኒ࿯ߦ⷗ࠄࠇࠆエൻ᜼േߣห᭽ߦߖ
ࠎᢿᔕജ߇ૐਅߒߡ㒢⇇⁁ᘒ✢ߦ㆐ߔࠆ⃻⽎ࠍႎ๔ߒߡ޿ࠆ㧚߹ߚ㧘Orenseࠄ17㧕ߪ㧘߆ߊੂߒߚࠪ࡞࠻
߹ߓࠅ⍾⾰࿯⹜ᢱࠍ↪޿ߡ㧘ૐ᜔᧤࿶ਅߢߩߖࠎᢿ
ᔕജ৻ቯ᧦ઙਅߦ߅ߌࠆᶐ᳓⹜㛎ࠍⴕ޿㧘᦭ലᔕജ⚻〝߇⎕უ✢ߦ㆐ߔࠆߎߣࠍႎ๔ߒߡ޿ࠆ㧚ߎࠇࠄߩ⎇ⓥߢߪ㧘ᶐ᳓ᤨߦ߅ߌࠆ᦭ലᔕജ⚻〝߳ߩᓇ㗀߇ᬌ⸛ߐࠇߡ߅ࠅ㧘޿ߕࠇ߽᦭ലᔕജ⚻〝߇ᦨ⚳⊛ߦ⎕უ✢ߦ㆐ߔࠆߎߣ߇ᜰ៰ߐࠇߡ޿ࠆߎߣ߇․ᓽ

473

100
80
60
40
20
0
0.001

0.01

0.1

Grain size ( mm )࿑ ࠞࠝ࡝ࡦ⹜ᢱߩ☸ᓘടⓍᦛ✢ߢ޽ࠆ㧚ߒ߆ߒ㧘ᧄ⎇ⓥߦ߅ߌࠆࠃ߁ߦ㧘ࠨ࡚ࠢࠪࡦᶖᄬߩߖࠎᢿᒝᐲ߳ߩᓇ㗀ߦ㑐ߒߡߪᬌ⸛ߐࠇߡ
޿ߥ޿߽ߩߣ⠨߃ࠄࠇࠆ㧚

3. ⹜ᢱ෸߮ታ㛎ᣇᴺ(1) ⹜ᢱ෸߮ଏ⹜૕ߩ૞⵾ᣇᴺ
a ࠞࠝ࡝ࡦ⹜ᢱߩ㘻๺ଏ⹜૕૞⵾ᣇᴺ
ᧄ⎇ⓥߢߪ㧘Ꮢ⽼ߩࠞࠝ࡝ࡦ⹜ᢱࠍ↪޿ߚ㧚⹜ᢱߩ‛ℂ⊛ᕈ⾰ࠍ⴫㧘☸ᓘടⓍᦛ✢ࠍ࿑ ߦ␜ߔ㧚᳇ੇ⁁ᘒߢ☳ᧃߩࠞࠝ࡝ࡦ⹜ᢱߦ㧘฽᳓Ყ߇ᶧᕈ㒢⇇ߩ 1.5 ୚ߣߥࠆࠃ߁ߦ⣕᳇᳓ࠍട߃ߡࠬ࡜࡝࡯ߣ
ߒߚ㧚ߘߩࠬ࡜࡝࡯ࠍኈེߦ౉ࠇߡ⌀ⓨ࠺ࠪࠤ࡯࠲
࡯ౝߦ⸳⟎ߒ㧘24 ᤨ㑆㧘90kPa એ਄ߩ⽶࿶ࠍਈ߃ߡ
⣕᳇ߒߚᓟߦ㧘࿶ኒኈེ(⋥ᓘ 14.5cm㧘㜞ߐ 14cm)
ߦ⒖ߒᦧ߃ߚ㧚ߘߩᓟ㧘ࡌࡠࡈ࡜ࡓࠪ࡝ࡦ࠳࡯ࠍ↪
޿ߚタ⩄ⵝ⟎ߢ਄タ࿶ 196kPa ߹ߢ৻ᰴర࿶ኒࠍⴕ
ߞߚ㧚࿶ኒ⚳ੌᓟ㧘࿶ኒኈེ߆ࠄࡉࡠ࠶ࠢࠨࡦࡊ࡞
ࠍᛮ߈಴ߒ㧘྾ಽഀߒߡࡄ࡜ࡈࠖࡦࠦ࡯࠻ࠍᣉߒ㧘࠺ࠪࠤ࡯࠲࡯ౝߦ଻▤ߒߚ㧚ߘߩ⹜ᢱࠍ⹜㛎⋥೨ߦ࠻࡝ࡑ࡯ߣࡢࠗࡗ࡯࠰࡯ࠍ↪޿ߡ⋥ᓘ⚂ 5cm㧘㜞ߐ⚂ 10cm ߩኸᴺߦᚑᒻߒߡ㧘ଏ⹜૕ࠍ૞⵾ߒߚ.ߎߩ
ࠃ߁ߦߒߡ૞⵾ߐࠇߚଏ⹜૕ߩ㘻๺ᐲߪ㧘ᓟឝ⴫
ߦ␜ߔࠃ߁ߦ 90㧑⒟ᐲߢ޽ߞߚ㧚ߎߩߚ߼෩ኒߦ
ߪ㘻๺ࠞࠝ࡝ࡦߣ๭߱ߎߣߪߢ߈ߥ޿߇㧘ᧄ⺰ᢥߢߪᰴߦㅀߴࠆਇ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ߣ඙೎ߔࠆߚ߼
ߦ㧘ߎߩࠃ߁ߦߒߡ૞⵾ߐࠇߚଏ⹜૕ࠍ‫ޟ‬㘻๺ࠞࠝ࡝ࡦଏ⹜૕‫ߣޠ‬๭ࠎߢ޿ࠆ㧚土木学会論文集Ｃ Vol.62 No.2, 471-487, 2006. 5

Bellofram

Vaccum desicator
Specimen
Load cell

Net

Vaccum pomp

Porous stone

Glass boad

Specimen
Ceramic disk࿑ ⌀ⓨ⫳⊒ᴺߦࠃࠆଏ⹜૕ߩਇ㘻๺ൻ 18㧕
Percent passing by weight (%)

Vc

100

Valve

80

To double tube burette

60

Drain measuring
device by weight

Pore waterpressure transducer40࿑ ਃゲ࠮࡞ࠍ↪޿ߚታ㛎ⵝ⟎ߩ᭎ⷐ

20
0
0.001

‛ℂ⊛ᕈ⾰ࠍ⴫ ߦ␜ߔ㧚
0.01

0.1

Grain size ( mm )(2) ታ㛎ⵝ⟎ ⹜㛎ߦߪ࿑ ߦ␜ߔਇ㘻๺࿯↪ਃゲ࠮࡞ࠍ↪޿ߚ㧚ࡍ࠺ࠬ࠲࡞ㇱߦߪ㧘ࡐ࡯࡜ࠬࠬ࠻࡯ࡦߩઍࠊࠅb  ⌀ⓨ⫳⊒ᴺߦࠃࠆਇ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ߩ૞⵾ߦⓨ᳇ଚ౉୯ AEV=500kPa ߩ࠮࡜ࡒ࠶ࠢ࠺ࠖࠬࠢ߇
ᣇᴺၒ߼ㄟ߹ࠇߡ޿ࠆ㧚ታ㛎ਛߪ࠮࡜ࡒ࠶ࠢ࠺ࠖࠬࠢߦ ೨㗄ߢㅀߴߚ੍஻࿶ኒᓟߩࡉࡠ࠶ࠢࠨࡦࡊ࡞߆ࠄ㧘ㅢߓߚឃ᳓⚻〝┵ㇱߦขࠅઃߌߚ㑆㓗᳓࿶⸘ߦࠃࠅ㧘੗਄ࠄߦࠃࠆ⌀ⓨ⫳⊒ᴺ 18㧕ࠍෳ⠨ߦ㧘એਅߩࠃ߁
࠮࡜ࡒ࠶ࠢ࠺ࠖࠬࠢࠍㅢߓߡ࿯ਛߩ㑆㓗᳓࿶ࠍ᷹ቯ
ߦߒߡਇ㘻๺ଏ⹜૕ࠍ૞⵾ߒߚ㧚߹ߕ㧘ᦨ⚳⊛ߥଏߒߚ㧚ଏ⹜૕ߩࠨ࡚ࠢࠪࡦߩᄢ߈ߐߪ㧘᷹ቯߐࠇߚ
⹜૕ߩࠨࠗ࠭㧔⋥ᓘ 5cm㧘㜞ߐ 10cm㧕ࠃࠅ߽ዋߒ
⽶ߩ㑆㓗᳓࿶ߩᄢ߈ߐߣ╬ߒ޿߽ߩߣߒߚ㧚ᄢ߈ߥࠨࠗ࠭ߩ౞ᩇᒻߦᚑᒻߒߚ⹜ᢱࠍ⌀ⓨ࠺ࠪࠤ࠮࡞ߦㅢߓࠆឃ᳓⚻〝ߩవ┵ㇱಽߦ㔚ሶᄤ⒊ᑼߩ࡯࠲㧙ߦ౉ࠇ㧘720mmHg ⒟ᐲߩ⽶࿶ࠍਈ߃ߚ(࿑ឃ᳓㊂᷹ቯེࠍធ⛯ߒߡ㧘࠮࡞ౝㇱ߳ߩๆឃ᳓㊂ࠍෳᾖ)㧚ߘߒߡ㧘ᚲቯߩタ⩄ᤨ㑆߇⚻ㆊߒߚᓟߦ⌀᷹ቯߒߚ㧚࠮࡞࿶ߩタ⩄ߪ㧘ឃ᳓㊂᷹ቯེౝߦᚲቯⓨ࠺ࠪࠤ࡯࠲ౝߩ⽶࿶ࠍ⸃㒰ߒߡ 6 ᤨ㑆એ਄᡼⟎ߒ㧘ߩⓨ᳇࿶ࠍਈ߃ࠆߎߣߦࠃࠅⴕߞߚ㧚ਇ㘻๺ࠞࠝ࡝⹜ᢱౝߩ฽᳓ᲧಽᏓ߇ߢ߈ࠆߛߌဋ৻ߣߥࠆߩࠍᓙ
ࡦଏ⹜૕ࠍ↪޿ߚ⹜㛎ᤨߦߪ㧘᷹ቯߐࠇߚ࠮࡞߳ߩ
ߞߚ㧚ߎߩࠃ߁ߦߒߡ૞⵾ߐࠇߚଏ⹜૕ౝߩ฽᳓Ყ
ๆឃ᳓㊂ߦኻߒߡ㧘࠮࡞ౝㇱ߳ߩࡇࠬ࠻ࡦ⽾౉㊂߅ಽᏓߪ㧘߶߷ဋ৻ߢ޽ߞߚߣႎ๔ߐࠇߡ޿ࠆ 18㧕㧚ࠃ߮એਅߩ 3.(2)b)㗄ߢㅀߴࠆ࠮࡞ߩౝ૕Ⓧᄌൻ㊂ߩߥ߅㧘⽶࿶ߩタ⩄ᤨ㑆ߪ㧘੍஻⹜㛎ߣߒߡ 24 ᤨ㑆⵬ᱜࠍⴕߞߡ㧘ଏ⹜૕ో૕ߩ૕Ⓧᄌൻࠍ᳞߼ߚ㧚⽶࿶ࠍタ⩄ᓟ㧘ଏ⹜૕ߩ㘻๺ᐲࠍ᳞߼ߡ߅߈㧘タ⩄ࡇࠬ࠻ࡦߪタ⩄ࠠࡖ࠶ࡊߣ೰⚿ߐࠇߡ߅ࠅ㧘ଏ⹜ᤨ㑆ߣ㘻๺ᐲߩૐਅ㊂㑐ଥ߇✢ᒻ㑐ଥࠍ␜ߔߣ޿߁૕ߩゲᄌ૏ߪࡇࠬ࠻ࡦࠍㅢߓߡ࠮࡞ᄖㇱߢ߭ߕߺࠥ
੗਄ࠄߩታ㛎⚿ᨐ 18㧕ࠍෳ⠨ߦ㧘⚂ 50㨪60㧑ߩ㘻๺࡯ࠫᑼߩᄌ૏⸘ߦࠃࠅ᷹ቯߒߚ㧚⩄㊀⸘ߪ࠮࡞ౝㇱᐲ߇ᓧࠄࠇࠆᤨ㑆ࠍ್ᢿߒߡ᳿ቯߒߚ㧚ߎߩࠃ߁ߦ
ߦ⸳⟎ߐࠇߡ޿ࠆߚ߼㧘ߖࠎᢿᤨߩࡇࠬ࠻ࡦ⽾౉ߦߒߡਇ㘻๺ൻߒߚ⹜ᢱࠍ࠻࡝ࡒࡦࠣᓟ㧘ଏ⹜૕ߣߒ
઻߁៺ᡂജߩᓇ㗀ߪήⷞߢ߈ࠆ߽ߩߣߒߚ㧚ߡ↪޿ߚ㧚ߥ߅㧘㘻๺ଏ⹜૕ࠍ↪޿ߡๆ᳓ㆊ⒟(ᓟឝ࿑ ෳc ਇ߆ߊੂᴒⓍ☼࿯⹜ᢱߦࠃࠆଏ⹜૕૞⵾ᣇᴺᾖ)ࠍⴕ߁႐วߪ㧘࠮࡞⚵ߺ┙ߡᤨߦタ⩄ࠠࡖ࠶ࡊ ᧄ⎇ⓥߦ↪޿ߚਇ߆ߊੂᴒⓍ☼࿯⹜ᢱߪ㧘ᄢ㒋Ꮢౝߩឃ᳓⚻〝ࠍ޽ࠄ߆ߓ߼⣕᳇᳓ߢḩߚߒߚ⁁ᘒߢౝߩជ೥Ꮏ੐⃻႐߆ࠄ࿕ቯࡇࠬ࠻ࡦᑼࠪࡦ࠙ࠜ࡯࡞
ੑ㊀▤ࡆࡘ࡟࠶࠻ࠍㅪ⚿ߒߡ⸳⟎ߒߚ㧚ߘߒߡ㧘࿶ࠨࡦࡊ࡜࡯ߢណขߐࠇ㧘ࡄ࡜ࡈࠖࡦࠦ࡯࠻ࠍᣉߐࠇ
ኒㆊ⒟ߪߎߩឃ᳓⚻〝ࠍ↪޿ߡឃ᳓ࠍⴕߞߚ㧚ߥ߅㧘
ߚ 2 ⒳㘃ߩਇ߆ߊੂ⹜ᢱߢ޽ࠆ㧚ߎߩ⹜ᢱࠍ࠻࡝ࡒ
ๆ᳓ㆊ⒟ࠍⴕ߁႐วߪଏ⹜૕਄┵ㇱࠃࠅឃ᳓⚻〝ࠍࡦࠣߒߡ⋥ᓘ⚂ 5cm㧘㜞ߐ⚂ 10cm ߦᚑᒻߒߚ߽ߩ
ㅢߓߡ⣕᳇᳓ࠍଏ⛎ߒߚ㧚ߘߒߡ㧘ߖࠎᢿㆊ⒟ߢߪ㧘ࠍଏ⹜૕ߣߒߚ㧚⹜ᢱߩ☸ᓘടⓍᦛ✢ࠍ࿑ ߦ㧘タ⩄ࠠࡖ࠶ࡊౝߩឃ᳓⚻〝ߩࡃ࡞ࡉࠍ㐽ߓߡ㧘㕖ឃ࿑ ਇ߆ߊੂᴒⓍ☼࿯⹜ᢱߩ☸ᓘടⓍᦛ✢474

measured wit h back pressure
measured wit hout back pressure

3

Pore water pressure ( kPa )40

Displacement into cell‫(ޓ‬cm )土木学会論文集Ｃ Vol.62 No.2, 471-487, 2006. 5

20
Reduct ion of applied pressure
0

-20

20

Displacement without specimen
Displacement in triaxial test

10

0

10

20

30

40

50

60

Cell pressure (kPa)

-40

0

50
T ime‫(ޓ‬min)࿑ ࠮࡞࿶ߣ࠮࡞ౝ߳ߩᵹ౉㊂㑐ଥ

100ࠆᔅⷐ߇޽ࠆ㧚ㅢᏱߩਇ㘻๺࿯ߩਃゲ࿶❗⹜㛎ߢߪ㧘ߎߩߚ߼ߦᄖ࠮࡞ߣౝ࠮࡞ࠍ᦭ߔࠆੑ㊀࠮࡞ᣇᑼ 5㧕߇↪޿ࠄࠇࠆߎߣ߇ᄙ޿㧚ߒ߆ߒ㧘ᧄ⎇ⓥߢߪ࿑
ߦ␜ߒߚਃゲ࠮࡞㧔ᄖ࠮࡞㧕ߩߺࠍ↪޿ߡ޿ࠆ㧚ߘߒߡ㧘╬ᣇ࿶❗ㆊ⒟ߢߩ࠮࡞࿶ߩᄌൻߦ઻޿࠮࡞ౝ
૕Ⓧ߇ᄌൻߔࠆ㧚ߎߩߚ߼㧘એਅߩᣇᴺߦࠃࠅ╬ᣇ࿶❗ㆊ⒟ߢߩਇ㘻๺ଏ⹜૕ో૕ߩ࿶❗㊂ࠍ᳞߼ߚ㧚࿑ ਛߩ ٤⸥ภߩࡊࡠ࠶࠻ߪ㧘ଏ⹜૕߇ߥ޿⁁ᘒߢߩ࠮࡞࿶ߩᄢ߈ߐߣߘߩᤨߩ࠮࡞߳ߩᵹ౉᳓㊂ߩ㑐ଥࠍ␜ߒߡ޿ࠆ㧚ߎߩᵹ౉᳓㊂ߪ㧘࠮࡞ߩ⤘ᒛ㊂ߣᱷ⇐ⓨ᳇ߩ࿶❗㊂╬ߦ⋧ᒰߔࠆߣ⠨߃ࠄࠇࠆ㧚߹ߚ㧘࿑ ਛߩٌ⸥ภߩࡊࡠ࠶࠻ߪ㧘ਇ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ࠍ⸳⟎ߒߡⴕߞߚߖࠎᢿㆊ⒟ߩ৻଀ߦ߅ߌ
ࠆ㧘࠮࡞࿶ࠍჇടߒߚタ⩄ߒߚ႐วߩ࠮࡞߳ߩᵹ౉
᳓㊂ࠍ␜ߒߡ޿ࠆ㧚࠮࡞࿶ߩჇടߦࠃࠆଏ⹜૕ߩ૕
Ⓧ࿶❗㊂ߪ㧘ਔᵹ౉᳓㊂ߩᏅߢਈ߃ࠄࠇࠆ߽ߩߣ⠨߃ࠄࠇࠆ㧚ᧄ⎇ⓥߢߪ㧘ਇ㘻๺ଏ⹜૕ࠍ↪޿ߚ႐วߦߪ㧘ߎߩ㊂ࠍ᷹ቯߒߡ╬ᣇ࿶❗ㆊ⒟ߢߩଏ⹜૕ో
૕ߩ࿶❗㊂ߣߒߚ㧚࿑ 㒰⩄೨ᓟߩ㑆㓗᳓࿶ᄌൻߩᲧセ᳓⹜㛎ࠍⴕߞߚ㧚߹ߚ㧘ਇ㘻๺ଏ⹜૕ࠍ↪޿ߡๆ᳓
ㆊ⒟(ᓟឝ࿑ ෳᾖ)ࠍⴕ߁႐วߦߪ㧘㘻๺ଏ⹜૕ߣห᭽㧘⣕᳇᳓ߢḩߚߒߚ⁁ᘒߢੑ㊀▤ࡆࡘ࡟࠶࠻
ࠍㅪ⚿ߒߡ⸳⟎ߒߚ㧚ߘߒߡ㧘࿶❗ㆊ⒟ߢߪ㧘ੑ㊀▤ࡆࡘ࡟࠶࠻ߩࡃ࡞ࡉࠍ㐽ߓߚ⁁ᘒߢ㧘࠮࡜ࡒ࠶ࠢ
࠺ࠖࠬࠢࠍㅢߓߡឃ᳓ࠍⴕߞߚ㧚ๆ᳓ㆊ⒟ߢߪ㧘࠮࡜ࡒ࠶ࠢ࠺ࠖࠬࠢ஥ߩࡃ࡞ࡉࠍ㐽ߓߡ㧘ੑ㊀▤ࡆࡘ࡟࠶࠻஥߆ࠄๆ᳓ࠍⴕ޿㧘ߖࠎᢿㆊ⒟ߢߪタ⩄ࠠࡖ࠶ࡊౝߩឃ᳓⚻〝஥ߩࡃ࡞ࡉࠍ㐽ߓߡ㧘㕖ឃ᳓⹜㛎ࠍⴕߞߚ㧚a ⽶ߩ㑆㓗᳓࿶᷹ቯߩߚ߼ߩ⢛࿶タ⩄ߦߟ޿ߡ
ᧄ⹜㛎ߢߪ㧘117.6kPa ߹ߢߩ╬ᣇ࿶ኒㆊ⒟߇⚳ੌߒߚᓟ㧘タ⩄࿶ജࠍ 19.6kPa ߹ߢᷫዋߔࠆ㒰⩄ㆊ⒟ࠍⴕߞߚ(ᓟឝ࿑ ෳᾖ)㧚ߘߩ㓙ߦ㑆㓗᳓࿶⚻〝ౝߦ⊒↢ߔࠆ᳇ᵃߩᓇ㗀ࠍዊߐߊߒߡ㧘ࠃࠅ♖ᐲߩ㜞޿⽶ߩ㑆㓗᳓࿶ߩ᷹ቯࠍน⢻ߦߔࠆߚ߼㧘㒰⩄೨ߦ
50kPa ߩⓨ᳇࿶ࠍ㧘࠮࡞࿶߅ࠃ߮タ⩄ࠠࡖ࠶ࡊౝߩ
ឃ᳓⚻〝ߦㅪ⚿ߒߚੑ㊀▤ࡆࡘ࡟࠶࠻ߦ⢛࿶ߣߒߡ(3) ታ㛎ᣇᴺ
ਈ߃ߚ㧚࿑ ߪ⢛࿶ࠍタ⩄ߒߚ႐วߣタ⩄ߒߡ޿࠮࡞ᐩ⋚ౝㇱߩ㑆㓗᳓࿶⸘ߦ⥋ࠆ߹ߢߩឃ᳓⚻〝ߥ޿႐วߦ߅޿ߡ㧘㒰⩄೨ᓟߩ㑆㓗᳓࿶ࠍ᷹ቯᲧセࠍ⣕᳇᳓ߢḩߚߒ㧘࠮࡜ࡒ࠶ࠢ࠺ࠖࠬࠢࠍขࠅઃߌ
ߒߚ߽ߩߢ޽ࠆ㧚⢛࿶ࠍタ⩄ߒߡ޿ߥ޿႐วߪ㧘᳓ߚࡍ࠺ࠬ࠲࡞ࠍ⸳⟎ߒߚᓟ㧘ട ࿶ ᣇ ᑼ ߩ 㘻 ๺ ᣇ࿶⚻〝ౝߩ᳇ᵃߩ⊒↢ߩᓇ㗀ߦࠃࠅ㧘᷹ቯߐࠇߚ⽶࿶߇ᄢ߈ߊߥߞߡ޿ࠆߎߣ߇ࠊ߆ࠆ㧚ߎߩ⚿ᨐ߆ࠄ㧘 ᴺ 19㧕ߦࠃࠅ࠮࡜ࡒ࠶ࠢ࠺ࠖࠬࠢࠍ㘻๺ߒߚ㧚ߥ߅㧘⢛࿶ࠍタ⩄ߔࠆߎߣߦࠃࠅ㧘㒰⩄ᤨߦ⊒↢ߔࠆ⽶ߩ࠮࡜ࡒ࠶ࠢ࠺ࠖࠬࠢ߅ࠃ߮㑆㓗᳓࿶⸘ߦ⛯ߊឃ᳓⚻㑆㓗᳓࿶ߩ᷹ቯ♖ᐲࠍࠃࠅ㜞߼ࠆߎߣ߇ߢ߈ߚ߽ߩ
〝ߩ㘻๺⁁ᘒߩ⏕⹺ߪ㧘ଏ⹜૕⸳⟎೨ߦ࠮࡜ࡒ࠶ࠢ
ߣ್ᢿߐࠇࠆ㧚࠺ࠖࠬࠢ⴫㕙ࠍ࠹ࠖ࠶ࠪࡘࡍ࡯ࡄ࡯ߢ᜞޿㧘ㅦ߿߆b ╬ᣇ࿶❗ㆊ⒟ߦ߅ߌࠆਇ㘻๺ଏ⹜૕ߩ૕Ⓧ࿶❗
ߦ⚂ 30kPa ߩ⽶࿶߇⊒↢ߔࠆߩࠍ⏕߆߼ࠆߎߣߦࠃ
㊂ߩ᷹ቯᣇᴺࠅⴕߞߚ 5㧕㧚 એਅߩ 3.(4)▵ߢㅀߴࠆࠃ߁ߦਇ㘻๺⁁ᘒߩࠞࠝ࡝
ଏ⹜૕ࠍࡍ࠺ࠬ࠲࡞ߦ⸳⟎ߒߡෘߐ 0.2mm ߩࡔࡦࡦଏ⹜૕ࠍ↪޿ߡ╬ᣇ࿶❗ㆊ⒟ࠍⴕ߁႐ว㧘࠮࡞࿶ࡉ࡟ࡦࠍⵍߖ㧘タ⩄ࠠࡖ࠶ࡊߣ O ࡝ࡦࠣߢࠪ࡯࡞ߒ
ߩჇടߦࠃࠅଏ⹜૕ౝߦሽ࿷ߔࠆ㑆㓗ⓨ᳇ߩ૕Ⓧ߇ߚ⁁ᘒߢ㧘ଏ⹜૕ߩೋᦼࠨ࡚ࠢࠪࡦߩ᷹ቯࠍⴕߞߚ㧚࿶❗ߔࠆ㧚ߎߩߚ߼㧘ߖࠎᢿ೨ߩਇ㘻๺ଏ⹜૕ߩ૕
ೋᦼࠨ࡚ࠢࠪࡦ᷹ቯᓟߦ࠮࡞ࠍ⚵ߺ┙ߡ㧘࠮࡞ౝㇱ
Ⓧࠍᱜ⏕ߦ᳞߼ࠆߦߪ㧘╬ᣇ࿶❗ㆊ⒟ߢߩଏ⹜૕ో
ߦ⣕᳇᳓ࠍḩߚߒߚ㧚࠮࡞߆ࠄߩឃ᳓㊂ࠍ᷹ቯߔࠆ
૕ߩ࿶❗㊂ࠍឃ᳓㊂ߣߪ೎ߩ૗ࠄ߆ߩᣇᴺߢ᷹ቯߔߚ߼ߩ㔚ሶᄤ⒊ߦㅢߓࠆឃ᳓⚻〝ࠍ㧘᳇ᵃࠍᏎ߈ㄟ475土木学会論文集Ｃ Vol.62 No.2, 471-487, 2006. 5

߹ߥ޿ࠃ߁ߦᵈᗧߒߥ߇ࠄធ⛯ߒߚ㧚╬ᣇ࿶ኒㆊ⒟ߪ࠮࡞࿶߇ 117.6kPa ߣߥࠆ߹ߢᲑ㓏⊛ߦⴕߞߚ㧚޽ࠄ߆ߓ߼⣕᳇᳓ߢḩߚߐࠇߚଏ⹜૕
਄㕙ߦㅢߓࠆឃ᳓⚻〝߆ࠄ࿶ኒᤨߩឃ᳓ࠍⴕߞߚ㧚╬ᣇ࿶ኒ⚳ੌᓟߦឃ᳓⚻〝ߩࠦ࠶ࠢࠍ㐽ߓ⁁ᘒߢ᜔᧤࿶ߩ㒰⩄ࠍⴕ߁ߎߣߦࠃࠅ㧘ଏ⹜૕ౝߦ↢ߓࠆ⽶࿶ࠍ᷹ቯߒߚ㧚ๆ᳓ㆊ⒟ࠍⴕ߁႐วߦߪߘߩᓟ㧘ࠦ࠶ࠢࠍ㐿߈ଏ⹜૕߳ߩๆ᳓ࠍⴕߞߚ㧚╬ᣇ࿶ߩタ⩄ㆊ⒟߿㒰⩄ㆊ⒟ߦ߅ߌࠆଏ⹜૕߆ࠄߩๆឃ᳓㊂ߪ㧘ੑ㊀▤ࡆࡘ࡟࠶࠻ߦធ⛯ߒߚ㔚ሶᄤ⒊ᑼឃ᳓㊂᷹ቯⵝ⟎㧔࿑ ਛߩ Drain measuring device by weight㧕ߦࠃߞߡ᷹ቯߒߚ㧚ߥ߅㧘ਇ㘻๺ଏ⹜૕ࠍ↪޿ߡๆ
᳓ㆊ⒟ࠍⴕࠊߥ޿႐วߪ㧘࠮࡞⚵ߺ┙ߡᤨ߆ࠄଏ⹜
૕਄㕙ߦㅢߓࠆឃ᳓⚻〝ߪ᳓ߩߥ޿⁁ᘒߢᄢ᳇࿶ߦ
㐿᡼ߒߡ޿ࠆ㧚ߖࠎᢿਛߪ㧘࠮࡞᳓ߩๆឃ᳓㊂ࠍ᷹ቯߒ㧘ߘࠇߦኻߒߡࡇࠬ࠻ࡦ⽾౉૕Ⓧࠍ⵬ᱜߔࠆߎߣߦࠃࠅ㧘ߖ
ࠎᢿㆊ⒟ߢߩଏ⹜૕ߩ૕Ⓧᄌൻ㊂ࠍ᳞߼ߚ㧚ታ㛎ਛߩฦ⹜㛎࠺࡯࠲ߩ᷹ቯߪ㧘࠺࡯࠲ࡠࠟ࡯ࠍ↪޿ߡ⥄േ⸘᷹ߒߚ㧚ߥ߅㧘ߖࠎᢿᤨߩ߭ߕߺㅦᐲߪ 0.4%/
ಽߣߒߚ㧚ߎߩ߭ߕߺㅦᐲߪ㧘ㆊ෰ߦ⪺⠪ߩ৻ੱ߇ⴕߞߚ✦࿕߼ߚਇ㘻๺ࠪ࡞࠻⾰࿯ߩ৻ゲ࿶❗⹜㛎ߩ⹜㛎⚿ᨐ 20㧕㧔ߖࠎᢿ߭ߕߺㅦᐲ 0.2㧑/ಽ㧕ߣ੹࿁ⴕߞߚਇ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ߩ⹜㛎⚿ᨐ߇ኻᔕߔࠆ
ࠃ߁ߦ㧘ߘߩ߭ߕߺㅦᐲࠍෳ⠨ߦߒߡ᳿ቯߒߚ㧚ࠞࠝ࡝ࡦ⹜ᢱߦኻߒߡߪᓟឝ࿑ ߦ␜ߔࠃ߁ߦ㧘੹࿁ߩ߭ߕߺㅦᐲߦࠃࠅᓧࠄࠇߚߖࠎᢿᒝᐲ㧔ࡇ࡯ࠢᒝᐲ㧕ߪ㧘ㆊ෰ߦⴕࠊࠇߚ߭ߕߺㅦᐲ 0.07㧑/ಽߩਃゲ࿶❗ߖࠎᢿ⹜㛎⚿ᨐߣኻᔕߒߡ޿ࠆߎߣ߇ࠊ߆
ࠆ㧚ਇ߆ߊੂᴒⓍ☼࿯⹜ᢱߦኻߒߡߪ㧘‫ޟ‬࿯ߩ㕖࿶ኒ㕖ឃ᳓㧔UU㧕ਃゲ࿶❗⹜㛎ᣇᴺ‫ޟ߮ࠃ߅ޠ‬࿯ߩ࿶ኒ㕖ឃ᳓㧔CU㧕ਃゲ࿶❗⹜㛎ᣇᴺ‫ⷙߦޠ‬ቯߐࠇߡ޿ࠆ߭ߕߺㅦᐲߩ⋡቟ 21 㧕 ߢ޽ࠆ 1㧑/ಽ߅ࠃ߮
0.05㧑/ಽߩਛ㑆⊛ߥ߭ߕߺㅦᐲߣߥߞߡ޿ࠆ㧚

Setting of specimen
Loading to 㱟䌣 䋽 19.6 kPa

Unconsolidation
䋨㕖࿶ኒ)

Loading to 㱟䌣 䋽 117.6 kPa

Consolidation
䋨㱟3=117.6kPa䋩

Applying back pressure
Unloading to 㱟䌣 䋽 19.6 kPa

Absorption

No swelling(ήๆ᳓)

Incompletely swelling)(ਛㅜๆ᳓)

Completely swelling(ቢోๆ᳓ )
࿑ ታ㛎ᚻ㗅ࡈࡠ࡯࠴ࡖ࡯࠻ߣ⹜㛎ߩ⒳㘃
㧔㘻๺ࠞࠝ࡝ࡦ߅ࠃ߮ਇ߆ߊੂᴒⓍ☼࿯ଏ⹜૕ߩ႐ว㧕ߢᲑ㓏⊛ߦ࿶ኒߒߚ㧚ߘߒߡ㧘㕖ឃ᳓᧦ઙߢ஥࿶
V 3㧩117.6kPaࠍタ⩄ߒߚ⁁ᘒߢ㧘⽶ߩ㑆㓗᳓࿶߅ࠃ߮ଏ⹜૕૕Ⓧᄌൻࠍ᷹ቯߒߥ߇ࠄߖࠎᢿㆊ⒟ࠍⴕߞ
ߚ㧚ߎߩ⹜㛎ࠍV 3 㧩117.6kPa⹜㛎㧔Consolidation㧕ߣ๭߱㧚࠮࡞ౝߦ⸳⟎ߒߚ⹜ᢱࠍV㨏㧩117.6kPaߩ࿶ኒ࿶ജ߹ߢᲑ㓏⊛ߦ࿶ኒߒߚᓟ㧘50kPaߩ⢛࿶ࠍട߃ߚ㧚ߘߩᓟ㧘㕖ឃ᳓⁁ᘒߢV 㨏 㧩19.6kPaߩ࿶ኒ࿶ജ߹ߢ㒰⩄ࠍⴕߞߚ㧚ߘߒߡ㧘⽶ߩ㑆㓗᳓࿶߅ࠃ߮
ଏ⹜૕૕Ⓧᄌൻࠍ᷹ቯߒߥ߇ࠄߖࠎᢿㆊ⒟ࠍⴕߞߚ㧚ߎߩ⹜㛎ࠍήๆ᳓⹜㛎(No swelling)ߣ๭߱㧚ήๆ᳓⹜㛎ߣห᭽ߦ㕖ឃ᳓⁁ᘒߢ㒰⩄ߒߚᓟ㧘ๆ᳓⚻〝ࠍ㐿޿ߡๆ᳓ㆊ⒟ࠍታᣉߒߚ㧚ߎߩᤨ㧘ଏ⹜૕߳ߩๆ
᳓㊂ߩ⚻ᤨᄌൻࠍ᷹ቯߒ㧘޽ࠆ㘻๺ᐲߦ㆐ߒߚᤨὐ
ߢๆ᳓ࠍᱛ߼ߚ㧚ߘߒߡ㧘㕖ឃ᳓᧦ઙߢV 3㧩
19.6kPaࠍタ⩄ߒߚ⁁ᘒߢ㧘⽶ߩ㑆㓗᳓࿶߅ࠃ߮ଏ

(4) ታ㛎᧦ઙ 3.(1)▵ߢㅀߴߚᚻ㗅ߦࠃࠅ૞⵾ߒߚ㘻๺ࠞࠝ࡝ࡦ

⹜૕૕Ⓧᄌൻࠍ᷹ቯߒߥ߇ࠄߖࠎᢿㆊ⒟ࠍⴕߞߚ㧚ߎߩ⹜㛎ࠍਛㅜๆ᳓⹜㛎(Incompletely swelling)ߣ๭

ଏ⹜૕㧘ਇ㘻๺ࠞࠝ࡝ࡦଏ⹜૕߅ࠃ߮ਇ߆ߊੂᴒⓍ☼࿯ଏ⹜૕ߩ3⒳㘃ߩଏ⹜૕ࠍ↪޿ߡ㧘એਅߦㅀߴ
ࠆታ㛎ࠍⴕߞߚ㧚࿑ߪ㧘㘻๺ࠞࠝ࡝ࡦଏ⹜૕߅ࠃ߮ਇ߆ߊੂᴒⓍ☼࿯ଏ⹜૕ࠍ↪޿ߚ႐วߩታ㛎ᚻ㗅ߩࡈࡠ࡯࠴ࡖ࡯
࠻ࠍ␜ߒߡ޿ࠆ㧚⹜ᢱࠍ࠻࡝ࡒࡦࠣᓟ㧘࠮࡞ౝߦ⸳
⟎ߒߚ㧚ߘߒߡ㧘㕖ឃ᳓᧦ઙߢ஥࿶V 3 㧩19.6kPaࠍタ⩄ߒߚ⁁ᘒߢ㧘⽶ߩ㑆㓗᳓࿶߅ࠃ߮ଏ⹜૕૕Ⓧᄌൻࠍ᷹ቯߒߥ߇ࠄߖࠎᢿㆊ⒟ࠍⴕߞߚ㧚ߎߩ⹜㛎ࠍ㕖࿶ኒ⹜㛎㧔Unconsolidation㧕ߣ๭߱㧚࠮࡞ౝߦ⸳
⟎ߒߚ⹜ᢱࠍV 㨏 㧩60kPa߅ࠃ߮117.6kPaߩ࿶ኒ࿶ജ

߱㧚߹ߚ㧘ๆ᳓ㆊ⒟ࠍ⛮⛯ߒߡ㧘ๆ᳓㊂ߩ⚻ᤨᄌൻ߇⪭ߜ⌕޿ߚᤨὐߢ⽶࿶߇ᶖᢔߒߚߩࠍ⏕⹺ߒߡๆ᳓ࠍᱛ߼ߚ㧚ߘߒߡ㧘ห᭽ߦߖࠎᢿㆊ⒟ࠍⴕߞߚ㧚⽶ߩ㑆㓗᳓࿶߇ᶖᢔߒߡๆ᳓ㆊ⒟߇⚳ੌߒߚߣ್ᢿ
ߐࠇࠆߩߢ㧘ߎߩ⹜㛎ࠍቢోๆ᳓⹜㛎㧔Completely
swelling㧕ߣ๭߱㧚࿑ߪ㧘ਇ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ࠍ↪޿ߚ႐วߩ
ታ㛎ᚻ㗅ߩࡈࡠ࡯࠴ࡖ࡯࠻ࠍ␜ߒߡ޿ࠆ㧚ଏ⹜૕ࠍ⸳⟎ᓟ㧘࿶ኒ࿶ജV 㨏 㧩19.6kPaࠍタ⩄ߒߡ࿶❗ㆊ⒟ࠍⴕߞߚ㧚ߘߒߡ㧘ឃ᳇㕖ឃ᳓᧦ઙߢ஥࿶V 3 㧩476

土木学会論文集Ｃ Vol.62 No.2, 471-487, 2006. 5

19.6kPaࠍタ⩄ߒߚ⁁ᘒߢ㧘ࠨ࡚ࠢࠪࡦ߅ࠃ߮ଏ⹜

ߘߩᓟ㧘ឃ᳇㕖ឃ᳓᧦ઙߢ஥࿶V 3 㧩19.6kPaࠍタ⩄
૕૕Ⓧᄌൻࠍ᷹ቯߒߥ߇ࠄߖࠎᢿㆊ⒟ࠍⴕߞߚ㧚ߎߒߚ⁁ᘒߢ㧘ࠨ࡚ࠢࠪࡦ߅ࠃ߮ଏ⹜૕૕Ⓧᄌൻࠍ᷹ࠇࠄߩ⹜㛎ߪSr=53%,63%ߣߒߡ␜ߐࠇߡ޿ࠆ㧚߹ߚ㧘 ቯߒߥ߇ࠄߖࠎᢿㆊ⒟ࠍⴕߞߚ㧚⴫ߪታᣉߒߚ⹜㛎ߣ㧘ೋᦼ⁁ᘒ߅ࠃ߮ߖࠎᢿㆊ
೎ߩታ㛎ߣߒߡ㧘╬ᣇ࿶❗ᓟߦๆ᳓ㆊ⒟ࠍታᣉߒߚ㧚⒟೨ߩଏ⹜૕ߩ⻉రࠍ␜ߒߡ޿ࠆ㧚ߎߎߢ㧘╬ᣇ࿶ߎߩๆ᳓ㆊ⒟ࠍㅜਛߢ⚳߃ߚ߽ߩ߇㧘Sr =53%ψ66%❗ㆊ⒟ߩV㨏㧩19.6kPaߪ㧘࿾⴫㕙ਅ⚂1㨙ߢߩ᦭ല࿯
ߣߒߡ␜ߐࠇߡ޿ࠆ㧚߹ߚ㧘ๆ᳓᜼േ߇߶ߣࠎߤᐔ
߆߱ࠅ࿶ࠍ⋡቟ߣߒߚ㧚߹ߚ㧘╬ᣇ࿶❗ㆊ⒟ߢߩ࿶
ⴧߣߥࠆ߹ߢⴕߞߚ߽ߩ߇㧘Sr =53%ψ80%߅ࠃ߮Sr=62%ψ78%ߣߒߡ␜ߐࠇߡ޿ࠆ㧚ߎࠇࠄߩଏ⹜૕ߪ
ኒᔕജV㨏㧩117.6kPaߪ㧘ᴒⓍ☼࿯⹜ᢱߩណขᷓᐲߦ
߅ߌࠆ᦭ല࿯߆߱ࠅ࿶ࠍ⋡቟ߣߒߚ㧚߹ߚ㧘⴫ਛߢߪ㧘ਇ߆ߊੂᴒⓍ☼࿯ଏ⹜૕ߩೋᦼ㘻๺ᐲࠍ100㧑
Setting of specimenߣ⴫␜ߒߡ޿ࠆ㧚ߒ߆ߒ㧘ታ㓙ߦߪ㧘ଏ⹜૕㊀㊂㧘฽᳓Ყ߅ࠃ߮૕Ⓧ߆ࠄ⸘▚ߐࠇߚ㘻๺ᐲߪ100㧑ࠍ
Sr=53%
ࠊߕ߆ߦ⿥߃ߡ޿ߚ㧚
Loading to 㱟䌣 䋽 19.6 kPa

Sr= 63䋦

4. ⹜㛎⚿ᨐ߅ࠃ߮⠨ኤ

Sr=53㸢66䋦(ਛㅜๆ᳓)

Absorption 㘻๺ࠞࠝ࡝ࡦଏ⹜૕ࠍ↪޿ߚታ㛎⚿ᨐ ࿑ ߪ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ߩቢోๆ᳓⹜㛎ߦ߅ߌࠆ㑆㓗Ყ㧘฽᳓Ყ߅ࠃ߮ࠨ࡚ࠢࠪࡦߩ⚻ᤨᄌൻࠍ␜ߒߡ޿ࠆ㧚ߎߩ࿑߆ࠄ㧘㑆㓗Ყ㧘฽᳓Ყ߅ࠃ߮ࠨ
࡚ࠢࠪࡦߣ߽ߦๆ᳓ㆊ⒟㐿ᆎ߆ࠄ 40 ಽ⒟ᐲߢᐔⴧ
⁁ᘒߣߥߞߡ޿ࠆߎߣ߇ࠊ߆ࠆ㧚࿑ ߪ㧘ๆ᳓ㆊ⒟ਛߦ᷹ቯߐࠇߚ⽶ߩ㑆㓗᳓࿶

Sr=53㸢80䋦
Sr=62㸢78䋦(ቢోๆ᳓ )
࿑ ታ㛎ᚻ㗅ࡈࡠ࡯࠴ࡖ࡯࠻ߣ⹜㛎ߩ⒳㘃
㧔ਇ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ߩ႐ว㧕⴫ ⹜㛎᧦ઙߣଏ⹜૕⻉ర

Initial state

MaxiumLateral stressisotropic
in shearing
compression
processstress(kPa)(kPa)

Test name

Void
raio

Degree ofsaturation(%)

ı3=117.6kPa

0.900

89

117.6

Completely swelling 0.901
Saturated
Incompletely swelling 0.904
kaolineNo swelling
0.902

90

SampleUnsaturated
kaolineAlluvialclay

State before shearing process
Void
ratio

Degree ofsaturation(%)

Suction
(kPa)

117.6

0.873

88

0

117.6

19.6

0.875

88

0

88

117.6

19.6

0.872

88

41

90

117.6

19.6

0.874

88

72

Unconsolidation

0.904

88

19.6

19.6

0.881

88

0

Sr=53%

0.849

53

19.6

19.6

0.849

53

49

Sr=53%㸢66%

0.837

53

19.6

19.6

0.847

66

5

Sr=53%㸢80%

0.871

53

19.6

19.6

0.969

80

0

Sr=63%

0.912

63

19.6

19.6

0.912

63

44

Sr=62%㸢78%

0.918

62

19.6

19.6

0.931

78

5

Completely swelling

1.345

100

117.6

19.6

1.360

100

0

Incompletely swelling 1.341

100

117.6

19.6

1.334

100

36

No swelling

1.331

100

117.6

19.6

1.310

100

54

Unconsolidation

1.345

100

19.6

19.6

1.345

100

0

477

土木学会論文集Ｃ Vol.62 No.2, 471-487, 2006. 5

300
(a)

0.878

Suction (kPa)

Void ratio (%)

0.880

200

0.876
0.874

100

0.872
0.870

0

100
200
300
Elapsed t ime (min)400

Water content (%)

Measured value
for wetting process

0
60

70
80
90
100
Degree of saturation㧔㧑㧕࿑ 㘻๺ࠞࠝ࡝ࡦଏ⹜૕ࠍ↪޿ߚቢోๆ᳓⹜㛎ߩ
ๆ᳓ㆊ⒟ߢߩ⽶ߩ㑆㓗᳓࿶㧔ࠨ࡚ࠢࠪࡦ㧕㨪㘻๺ᐲ㑐ଥߣ᳓ಽ․ᕈᦛ✢ߣߩᲧセ

29.0
(b)

28.8

SWCC for drying process

28.6
28.4
28.2
28.0

0

100

200

300

400

Elapsed t ime (min)Suction (kPa)

60

(c)

40
20
0
0

100
200
300
Elapsed t ime (min)400࿑ 㘻๺ࠞࠝ࡝ࡦଏ⹜૕ࠍ↪޿ߚቢోๆ᳓⹜㛎ߩ
ๆ᳓ㆊ⒟ߦ߅ߌࠆ㑆㓗Ყ㧘฽᳓Ყ㧘ࠨ࡚ࠢࠪࡦߩ⚻ᤨᄌൻ

ߣ㘻๺ᐲߩ㑐ଥࠍ᳓ಽ․ᕈᦛ✢ߣᲧセߒߚ߽ߩߢ޽
ࠆ㧚࿑ਛߩታ✢߇ๆ᳓ㆊ⒟ਛߦ᷹ቯߐࠇߚ⽶ߩ㑆㓗᳓࿶㧔ࠨ࡚ࠢࠪࡦ㧕㨪㘻๺ᐲ㑐ଥߢ޽ࠅ㧘٨⸥ภߩࡊࡠ࠶࠻ߪㆊ෰ߦⴕࠊࠇߚ㧘หߓ⹜ᢱߩ੍࿶ኒଏ⹜
૕ߦࠃࠅᓧࠄࠇߚឃ᳓ᦛ✢ 22㧕ࠍ␜ߒߡ޿ࠆ㧚ߎߩ࿑߆ࠄ㧘ๆ᳓ㆊ⒟ߢߩ᜼േ߇ଏ⹜૕ߩⓨ᳇ଚ౉୯㧔⚂ 250kPa㧕એਅߩᄢ߈ߐߩࠨ࡚ࠢࠪࡦߩ▸࿐ߢ↢ߓߡ޿ࠆߎߣ߇ࠊ߆ࠆ㧚࿑ C D ߪߘࠇߙࠇ㧘㘻๺ࠞࠝ࡝ࡦଏ⹜૕ߩ
ߖࠎᢿㆊ⒟ߦ߅ߌࠆߖࠎᢿᔕജ㨪ゲ߭ߕߺ㑐ଥ㧘߅ࠃ߮㑆㓗᳓࿶㨪ゲ߭ߕߺ㑐ଥࠍ␜ߒߡ޿ࠆ㧚ߖࠎᢿᔕജ㨪ゲ߭ߕߺ㑐ଥߦ߅޿ߡゲ߭ߕߺ߇⚂ 5%ઃㄭ߹ߢߒ߆࠺࡯࠲߇ሽ࿷ߒߥ޿ߩߪ㧘ߘߩઃㄭߢᕆỗߦߖࠎᢿᔕജ߇ૐਅߒߡ㧘ଏ⹜૕߇⎕უߒߚߚ߼ߢ
޽ࠆ㧚࿑ C ߩߖࠎᢿᔕജ㨪ゲ߭ߕߺ㑐ଥߢߪ㧘ήๆ᳓ ⹜ 㛎 (No swelling) ߣ V 3 㧩 117.6kPa ⹜ 㛎(Consolidation)ߢߪ㧘ᦨᄢߖࠎᢿᔕജߩᏅߪ௖߆ߒ
߆⷗ࠄࠇߥ޿㧚ߎߩߎߣߪ㧘ήๆ᳓⹜㛎ߦ߅ߌࠆ㕖ឃ᳓᧦ઙߦ߅ߌࠆ㒰⩄߇㧘࿯ߩ㛽ᩰ᭴ㅧߦߪ߶ߣࠎ
ߤᓇ㗀ࠍਈ߃ߥ߆ߞߚߎߣࠍᗧ๧ߒߡ޿ࠆ㧚৻ᣇ㧘

478ਛㅜๆ᳓⹜㛎㧔Incompletely swelling㧕ߩ႐วߪࠊߕ
߆ߦૐ޿ૐ޿ᦨᄢߖࠎᢿᔕജࠍ␜ߒߡ޿ࠆ㧚߹ߚ㧘ቢోๆ᳓⹜㛎㧔Completely swelling㧕ߩ႐ว㧘ๆ᳓ߦࠃࠆࠨ࡚ࠢࠪࡦᶖᄬߩᓇ㗀ࠍฃߌߡૐ޿ᦨᄢߖࠎ
ᢿᔕജࠍ␜ߒߡ޿ࠆ㧚㕖࿶ኒ⹜㛎(Unconsolidation)ߣߘࠇએᄖߩଏ⹜૕ࠍᲧセߔࠆߣ㧘ᦨᄢߖࠎᢿᔕജ
ߩᄢ߈ߐ߇ᄢ߈ߊ⇣ߥߞߡ޿ࠆߩ߇ࠊ߆ࠆ㧚ߘߩේ࿃ߣߒߡߪ㧘╬ᣇ࿶ኒㆊ⒟ߩᓇ㗀߇⠨߃ࠄࠇࠆ㧚࿑ D ߩ㑆㓗᳓࿶㨪ゲ߭ߕߺ㑐ଥߢߪ㧘㕖࿶ኒ⹜㛎ߣV 3㧩117.6kPa ⹜㛎ߪ࿶ኒㆊ⒟ߩᓇ㗀ߦࠃࠅ௑ะ߇⇣ߥߞߡ޿ࠆ㧚ଏ⹜૕ࠍ૞⵾ߒߚࡉࡠ࠶ࠢࠨࡦ
ࡊ࡞߇਄タ࿶ 196kPa ߢ૞⵾ߐࠇߚߎߣࠍ⠨ᘦߔࠇ߫㧘㕒ᱛ࿯࿶ଥᢙ K0ѳ0.5 ࠍ઒ቯߔࠇ߫వⴕ࿶ኒᔕ
ജߪ⚂ 100kPa ߣ⠨߃ࠄࠇࠆ㧚ߎߩߚ߼㧘㕖࿶ኒ⹜㛎ߩ႐วߩᣇ߇㧘V 3㧩117.6kPa ⹜㛎ࠃࠅ߽ࠃࠅㆊ࿶
ኒߥ⁁ᘒߦ޽ࠅ㧘㑆㓗᳓࿶㨪ゲ߭ߕߺ㑐ଥ߽ߎࠇߦ
ኻᔕߒߡ޿ࠆ߽ߩߣ⠨߃ࠄࠇࠆ㧚৻ᣇ㧘ਛㅜ࿶ኒ⹜
㛎ߣήๆ᳓⹜㛎ߪ㧘㑆㓗᳓࿶ߩೋᦼ୯ߦ㆑޿ࠍ↢ߓߡ޿ࠆ㧚ߎࠇߪ㧘ήๆ᳓⹜㛎ߦ߅ߌࠆ㒰⩄ㆊ⒟ߩᓇ
㗀ߢ޽ࠆ㧚ߒ߆ߒ㧘ߖࠎᢿਛߩ᜼േߪ߶߷หߓ௑ะ
ࠍ␜ߒߡ޿ࠆߣ⠨߃ࠄࠇࠆ㧚ήๆ᳓㧘ਛㅜๆ᳓㧘ቢోๆ᳓ߩ 3 ⒳㘃ߩ⹜㛎ࠍᲧセߔࠆߣ㧘ๆ᳓ㆊ⒟ߦ߅
ߌࠆๆ᳓㊂ߩ㆑޿ߦࠃࠅߖࠎᢿೋᦼߩ㑆㓗᳓࿶ߩᄢ߈ߐ߇⇣ߥࠆߦ߽㑐ࠊࠄߕ㧘ߖࠎᢿ߇޽ࠆ⒟ᐲㅴ߻
ߣ㧘㑆㓗᳓࿶㨪ゲ߭ߕߺ㑐ଥߪหߓ௑ะࠍ␜ߒߡ޿
ࠆߩ߇․ᓽ⊛ߢ޽ࠆ㧚࿑ ߪ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ࠍ↪޿ߚ⹜㛎ߢߩߖ
ࠎᢿㆊ⒟ߦ߅ߌࠆ᦭ലᔕജ⚻〝ࠍ␜ߒߡ޿ࠆ㧚ήๆ᳓⹜㛎ߩᔕജ⚻〝ߪ࿑ਛߩ M =1.64 ߩ⋥✢ߦᴪߞߚ⚻〝ࠍ␜ߒߡ޿ࠆ㧚߹ߚ㧘V 3㧩117.6kPa ⹜㛎ߩᔕജ⚻〝ߪ㧘ߖࠎᢿ㐿ᆎߣߣ߽ߦᔕജ⚻〝߇߶߷ု⋥ߦ┙ߜ਄߇ߞߡ࿑ਛߩ M 㧩1.64 ߩ⋥✢㆐ߒߚᓟ㧘⋥✢ߦᴪߞߚ⚻〝ࠍ␜ߒߡ޿ࠆ㧚ߎߩࠃ߁ߥ௑ะߦߪ㧘㑆㓗᳓࿶߇ᶖᢔߒߚ⁁ᘒߢߩ᦭ല᜔᧤࿶ߣࠨ࡚ࠢࠪ
ࡦߦࠃࠆ᦭ല᜔᧤࿶ߩᄢ߈ߐ߇หߓߢ޽ࠆߎߣ߇ᓇ

土木学会論文集Ｃ Vol.62 No.2, 471-487, 2006. 5
600

600
M=1.64

(a)

500

500
400
q (kPa)

300

200

200

100

100

0

Pore water pressure uw (kPa)Symbols are t he sameas Figure (b).

300

0

0

1

(b)

100

2
3
4
Axial st rain H a (%)

5

6

Unconsolidat ion
V 3=117.6kP a
Complet ly swelling
No swelling
Incomplet ely swelling
0

100

200

300 400p' (kP a)

500

600

࿑ 㘻๺ࠞࠝ࡝ࡦଏ⹜૕ࠍ↪޿ߚ⹜㛎ߦ߅ߌࠆ ᦭ലᔕജ⚻〝Unconsolidat ion
V 3=117.6kP a
Complet ly swelling
No swelling
Incompletely swelling2000
M=1.640

q (kPa)q (kPa)

400

1000

-100

0

1

2
3
4
Axial st rain H a ( % )5Anisot ropic consolidat ion
Isot ropic consolidat ion

60࿑ 㘻๺ࠞࠝ࡝ࡦଏ⹜૕ߩߖࠎᢿㆊ⒟ߦ߅ߌࠆ
ߖࠎᢿᔕജ㧘㑆㓗᳓࿶㨪ゲ߭ߕߺ㑐ଥ

01000
p' (kP a)

2000࿑ 㘻๺ࠞࠝ࡝ࡦଏ⹜૕ࠍ↪޿ߚਃゲ࿶❗⹜㛎 ⚿ᨐߣẋㄭ✢ߣߩᲧセ㗀ߒߡ޿ࠆ߽ߩߣ⠨߃ࠄࠇࠆ㧚ਛㅜๆ᳓߅ࠃ߮ቢో
ๆ᳓⹜㛎ߢߪ㧘ๆ᳓ߦࠃࠅ↢ߓߚࠨ࡚ࠢࠪࡦߩૐਅ
ߩ࠺࡯࠲ࠍ㒰޿ߚ㧘ẋㄭ✢਄ߦઃㄭߩٌ⸥ภߩ࠺࡯
ߩߚ߼㧘ߖࠎᢿೋᦼߩ᦭ല᜔᧤࿶߇ᷫዋߒߡ޿ࠆ㧚࠲㧘߅ࠃ߮٨⸥ภߢ␜ߐࠇࠆ⇣ᣇ࿶ኒᓟߩਃゲ࿶❗
ߒ߆ߒ㧘ߖࠎᢿ߇ㅴ߻ߣ㧘೨ㅀߩ 2 ߟߩ⹜㛎ߣหߓߖࠎᢿ⹜㛎࠺࡯࠲ߪ㧘ẋㄭ✢ઃㄭߦಽᏓߒߡ޿ࠆ㧚⋥✢⁁ߦẋㄭߒߡ޿ߊ௑ะ߇⷗ࠄࠇࠆ㧚࿑ਛߩ⋥✢ߎߩ⚿ᨐߪ㧘੹࿁ߩ৻ゲ࿶❗⹜㛎⚿ᨐߦࠃࠆẋㄭ✢ߪ㧘௑߈ M =1.64 ࠍᜬߟẋㄭ✢ࠍ␜ߒߡ޿ࠆ㧚ߥ߅㧘 ߇ਃゲ࿶❗ߖࠎᢿ⹜㛎ߢᓧࠄࠇࠆ⎕უ✢ߦኻᔕߔࠆ
㕖࿶ኒ⹜㛎ߩ᦭ലᔕജ⚻〝ߪ㧘ߎߩẋㄭ✢ࠃࠅࠊߕߎߣࠍ␜ߔ߽ߩߣ⠨߃ࠄࠇࠆ㧚࿑ ߅ࠃ߮࿑
߆ߦ਄஥ࠍㅢࠆ௑ะࠍ␜ߒߡ޿ࠆ㧚ߩ⚿ᨐࠍวࠊߖߡ್ᢿߔࠆߣ㧘㜞㘻๺ᐲߩਇ㘻๺࿯࿑ ߪ㧘ㆊ෰ߦหߓ⹜ᢱࠍ↪޿ߡⴕࠊࠇߚਃゲߦኻߔࠆ⹜㛎ߦ߅޿ߡ㧘᦭ലᔕജ⚻〝߇ߖࠎᢿߩㅴ
࿶❗ߖࠎᢿ⹜㛎 22㧕ߦ߅ߌࠆ⎕უᔕജ㧔ᦨᄢߖࠎᢿ
ⴕߣߣ߽ߦ⎕უ✢਄ߦ㆐ߒߚᓟߦ⎕უ✢ߦᴪߞߡ⒖ᔕജ㧕⁁ᘒߣ࿑ ਛߩẋㄭ✢㧔M =1.64㧕ࠍᲧセߒേߔࠆ௑ะߦ޽ࠆߎߣࠍᗧ๧ߒߡ޿ࠆ㧚ߎߩࠃ߁ߥ
ߚ߽ߩߢ޽ࠆ㧚࿑ਛߩ⍫ශࠍߟߌߚٌ⸥ภߩ⚿ᨐߪ௑ะߪ㧘࿑ ߦ␜ߔ Toll 㧒 Ong23㧕ߦࠃࠆਃゲ࿶❗
ẋㄭ✢߆ࠄᄖࠇࠆ௑ะࠍ␜ߒߡ޿ࠆ㧚ߎࠇࠄߩ࠺࡯
⹜㛎ߦ߅ߌࠆ⚿ᨐ߿㧘Shimizu & Tabuchi24)ߦࠃࠆࠨ
࠲ߦߟ޿ߡߪ㧘ᱜⷙൻߒߚᔕജᲧ㧔q/p㧕㨪ゲ߭ߕ࡚ࠢࠪࡦࠍ᷹ቯߒߚ৻ゲ࿶❗⹜㛎⚿ᨐߦ߅޿ߡ߽ⷰ
ߺ㑐ଥߩ௑ะ߇ẋㄭ✢਄ߦሽ࿷ߔࠆ࠺࡯࠲ߣߪ⇣ߥኤߐࠇߡ޿ࠆ㧚ߞߡ޿ߚ㧚ߎߩ᭽ߥ௑ะࠍ␜ߔℂ↱ߣߒߡߪ㧘⍫ශࠍߟߌߚٌ⸥ภߩ࠺࡯࠲ߦ㑐ߒߡߪ㧘࠻࡝ࡒࡦࠣᤨ
ߩੂࠇ╬ߩᓇ㗀߇⃻ࠇߚ߽ߩߣផኤߐࠇࠆ㧚ߎࠇࠄ

479

600

Degree of saturation (%)

土木学会論文集Ｃ Vol.62 No.2, 471-487, 2006. 5

Failure line
Const ant wat er cont ent t est
Drained t est

q (kPa)

500
400
300

Sr=62%ψ78%

70

Sr=53%ψ80%
Sr=53%ψ66%

50

0

(a)

1000 2000 3000 4000

Time (min)

200
100

0.92
100

200 300 400(kP a)p’p(kPa)

500

Void ratio

0
0

600

࿑ 㜞㘻๺ᐲߩਇ㘻๺࿯ߦኻߔࠆਃゲ⹜㛎⹜㛎ߦ߅ߌࠆ᦭ലᔕജ⚻〝 17㧕

Sr=62%ψ78%
Sr=53%ψ80%

0.88

(b)
Sr=53%ψ66%

0.84

Water content (%)

01000 2000 3000 4000(2) ਇ㘻๺ൻߒߚࠞࠝ࡝ࡦଏ⹜૕ࠍ↪޿ߚታ㛎⚿ᨐ
Time (min)࿑ ߪๆ᳓ㆊ⒟ࠍⴕߞߚଏ⹜૕ߦ߅ߌࠆ㘻๺ᐲ㧘
26
Sr=62%ψ78%㑆㓗Ყ߅ࠃ߮฽᳓Ყߩ⚻ᤨᄌൻࠍ␜ߒߡ޿ࠆ㧚
Sr=53%ψ80%ଏ⹜૕㧘Sr =62%ψ78%ଏ⹜૕ߦ߅޿ߡ
22 Sr=53%ψ80%
Sr=53%ψ66%ߪ㧘ๆ᳓ㆊ⒟㐿ᆎ⋥ᓟ㧘ᕆỗߦଏ⹜૕ౝ߳ߩๆ᳓߇
↢ߓ㧘㘻๺ᐲ߅ࠃ߮฽᳓Ყ߇⍴ᤨ㑆ߦჇടߒߡ޿ࠆ㧚(c)18ߘߩᓟ㧘㘻๺ᐲ߅ࠃ߮฽᳓ᲧߩჇടߪ✭߿߆ߣߥࠅ㧘
01000 2000 3000 4000᷹ቯ⚳ੌઃㄭߢߪᐔⴧ⁁ᘒߦ⥋ߞߡ޿ࠆߣ್ᢿߐࠇ
Time (min)ࠆ㧚Sr =53%ψ66%ଏ⹜૕ߩ႐วߪ㧘ߎࠇࠄߣߪ௑ะ
߇⇣ߥࠅ㧘ๆ᳓ㅦᐲ߇߆ߥࠅㆃߊߥߞߡ޿ࠆ㧚ߎߩ࿑ ਇ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ࠍ↪޿ߚ⹜㛎ߩ
ๆ᳓ㆊ⒟ߦ߅ߌࠆ㘻๺ᐲ㧘㑆㓗Ყ㧘
ℂ↱ߪਇ᣿ߢ޽ࠆ߇㧘ℂ↱ߣߒߡߪ㧘ታ㛎㐿ᆎᤨߩ฽᳓Ყߩ⚻ᤨᄌൻ
࠮࡜ࡒ࠶ࠢߩ⁁ᘒߩ㆑޿╬߇ᓇ㗀ߒߚ߽ߩߣផ᷹ߐ
ࠇࠆ㧚㑆㓗Ყߩ᜼േߪ㧘ๆ᳓㊂ߣኻᔕߒߚᒻߢჇട
ᕈ⊛ߥ௑ะࠍ␜ߔߎߣߪ㧘☸ሶ㑆ઃ⌕ജߩᄢ߈ߐࠍ
ࠍ␜ߒߡ޿ࠆ㧚⥄↱ߦ⸳ቯߒߚ୘೎ⷐ⚛ᴺߦࠃࠆੑᰴర☸⁁᧚ᢱߩ࿑ C  D ߪߘࠇߙࠇ㧘ߖࠎᢿㆊ⒟ߦ߅ߌࠆߖੑゲ࿶❗⹜㛎ߦ߅ߌࠆ⚿ᨐ 25㧕ߦ߅޿ߡ߽⏕⹺ߐࠇࠎᢿᔕജ㧘૕Ⓧ߭ߕߺ㨪߭ߕߺ㑐ଥ߅ࠃ߮㑆㓗᳓࿶
ߡ޿ࠆ㧚Sr =53%ଏ⹜૕ߦ⷗ࠄࠇࠆ⣀ᕈ⊛ߥ᜼േߪ㧘㨪ゲ߭ߕߺ㑐ଥࠍߘࠇߙࠇ␜ߒߡ޿ࠆ㧚ߔߴߡߩଏ
Sr㧩53ψ66㧑ଏ⹜૕ߦ߅޿ߡߪ㧘ๆ᳓ㆊ⒟ߦࠃࠅࡔ
⹜૕ߩ࠺࡯࠲߇㧘ゲ߭ߕߺ 4㨪5㧑߹ߢߒ߆⴫␜ߐ
࠾ࠬࠞࠬ᳓ߩᓇ㗀߇ᶖᄬߒߚߚ߼ߦ↢ߓߡ޿ߥ޿߽
ࠇߡ޿ߥ޿ߩߪ㧘೨㗄ߢㅀߴߚ㘻๺ࠞࠝ࡝ࡦଏ⹜૕
ߩߣ⠨߃ࠄࠇࠆ㧚ߒ߆ߒ㧘Sr㧩53ψ80㧑ଏ⹜૕ߦߟ
ߩ႐วߣห᭽ߦ㧘ଏ⹜૕߇ᕆỗߦ⎕უࠍ↢ߓߚߚ߼޿ߡߪ㧘૕Ⓧ࿶❗ࠍ↢ߓ㧘ᱜߩ㑆㓗᳓࿶߇⊒↢ߒߡߢ޽ࠆ㧚ๆ᳓ㆊ⒟ࠍⴕߞߡ޿ߥ޿ Sr =53%ଏ⹜૕ߣ޿ࠆ㧚ߐࠄߦ㧘ߖࠎᢿᔕജ㨪ゲ߭ߕߺ㑐ଥߦࡇ࡯ࠢ
Sr =63%ଏ⹜૕ࠍᲧセߔࠆߣ㧘Sr =53%ଏ⹜૕ߢߪ㧘߇⷗ࠄࠇࠆ㧚ߎߩ⣀ᕈ⊛ߥ᜼േߦ㑐ߒߡߪ㧘ߖࠎᢿߖࠎᢿᔕജ㨪ゲ߭ߕߺ㑐ଥߦ߅޿ߡࡇ࡯ࠢ᜼േ߇⷗
೨ߩ㘻๺ᐲߩᄢ߈ߐ㧘߅ࠃ߮㑆㓗᳓࿶߇߶߷࠯ࡠߢ
ࠄࠇࠆߩߦኻߒߡ㧘Sr =63%ଏ⹜૕ߢߪߖࠎᢿᔕജ
޽ࠆߎߣ߆ࠄ⠨߃ࠆߣ㧘ࡔ࠾ࠬࠞࠬߩᓇ㗀ߢߪߥߊ㧘߇Ⴧടࠍ⛯ߌߡ⎕უߦ⥋ߞߡ޿ࠆ㧚߹ߚ㧘ߎߩ 2 ߟ㘻๺ൻߦࠃࠆ೰ᕈߩᷫዋ╬߇ᓇ㗀ߒߡ޿ࠆ߽ߩߣផ
ߩଏ⹜૕ߪ(b)࿑ߦ␜ߐࠇߡ޿ࠆࠃ߁ߦ㑆㓗᳓࿶ߩᄌ᷹ߐࠇࠆ㧚ൻ௑ะ߇߶߷หߓߢ޽ࠆ㧚ߎߩࠃ߁ߦߖࠎᢿᔕജ㨪
Sr㧩63㧑ଏ⹜૕ߣ Sr㧩62ψ78㧑ଏ⹜૕ࠍᲧセߔࠆゲ߭ߕߺ㑐ଥߩ௑ะ߇ᄢ߈ߊ⇣ߥߞߡ޿ࠆߩߪ㧘Sr
ߣ㧘Sr㧩62ψ78㧑ߩߖࠎᢿ೨ߩ㑆㓗᳓࿶ߩ୯ߪ㧘ๆ
=53%ଏ⹜૕ߩ߶߁߇㘻๺ᐲ߇ૐߊ㧘ࡔ࠾ࠬࠞࠬ᳓
᳓ㆊ⒟ߩᓇ㗀ߦࠃࠅ߶߷࠯ࡠߣߥߞߡ޿ࠆ㧚૕Ⓧ߭ߩᓇ㗀߇ᄢ߈ߊ⃻ࠇߚߚ߼ߣ⠨߃ࠄࠇࠆ㧚ࡔ࠾ࠬࠞߕߺ㨪ゲ߭ߕߺ㑐ଥߢߪ㧘Sr =63%ଏ⹜૕ߩᣇ߇߿
ࠬ᳓ߪ☸ሶ㑆ઃ⌕ജࠍ߽ߚࠄߔ㧚ߎߩ☸ሶ㑆ઃ⌕ജ߿࿶❗஥ߦ߭ߕߺ߇↢ߓߡ޿ࠆߎߣ߇ಽ߆ࠆ㧚߹ߚ㧘߇Ⴧടߔࠆߣ㧘ߖࠎᢿᔕജ㨪ゲ߭ߕߺ㑐ଥ߇ࠃࠅ⣀480

土木学会論文集Ｃ Vol.62 No.2, 471-487, 2006. 5

Sr=53%
Sr=53%ψ66%
Sr=53%ψ80%
Sr=63%
Sr=62%ψ78%

M=1.22(a)1q‫(ޓ‬kPa)

200

100

(a)

0

0.5

100

Hv (%)

q (kPa)

200

300

0

0

Sr=53%
Sr=53%ψ66%
Sr=53%ψ80%
Sr=63%
Sr=62%ψ78%
0

100
200
p' = p - uw (kP a)

300

300

M =1.6401

Pore water pressure uw (kPa)

100

2
3
4
Axial st rain Ha (%)
Sr=53%
Sr=53%ψ66%
Sr=53%ψ80%
Sr=63%
Sr=62%ψ78%

5

6

(b)

-0.5
200
q‫( ޓ‬kPa)

-100

(b)

100

0

0

-100

Sr=53%
Sr=53%ψ66%
Sr=53%ψ80%
Sr=63%
Sr=62%ψ78%
0

100

200
p + ps (kP a)

300࿑ ਇ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ࠍ↪޿ߚ⹜㛎ߦ߅ߌࠆ᦭ലᔕജ⚻〝

0

1

2
3
4
5
Axial st rain Ha (%)߿ࡇ࡯ࠢߩᔕജ⁁ᘒߩᔕജὐࠍㅢࠆ㧘௑߈M =1.22ߩ⋥✢ࠍ␜ߒߡ޿ࠆ㧚߹ߚ㧘࿑ D ߩ࿑ਛߩታ
✢ߪ㧘࿑ߦ␜ߒߚ㘻๺ࠞࠝ࡝ࡦ⹜ᢱߩ⎕უ✢ߣห ߓ 㧘 ௑ ߈ M =1.64 ߩ ⋥ ✢ ࠍ ␜ ߒ ߡ ޿ ࠆ 㧚 ࿑  C  D ࠍᲧセߔࠆߣ㧘Sr =53%ଏ⹜૕ߩᱷ⇐ᔕജ

6࿑ ਇ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ࠍ↪޿ߚ⹜㛎ߩߖࠎ
ᢿㆊ⒟ߦ߅ߌࠆߖࠎᢿᔕജ㧘㑆㓗᳓࿶㨪ゲ߭ߕߺ㑐ଥ⁁ᘒ߅ࠃ߮ઁߩଏ⹜૕ߩࡇ࡯ࠢᔕജ⁁ᘒߪ㧘(b)࿑ߩ
ᣇ߇ࠃࠅታ✢ઃㄭߦಽᏓߔࠆ௑ะࠍ␜ߒߡ޿ࠆߎߣ
߇ࠊ߆ࠆ㧚ߎߩ⚿ᨐߪ㧘ਇ㘻๺࿯ߩᒝᐲߦኻߔࠆࠨ
࡚ࠢࠪࡦᔕജߩᓇ㗀㧘߅ࠃ߮ࠨ࡚ࠢࠪࡦᔕജࠍ⠨ᘦߒߚᒝᐲߩᢛℂᣇᴺߩ᦭ലᕈࠍ␜ߒߡ޿ࠆ߽ߩߣ⠨߃ࠄࠇࠆ㧚࿑ ߦ␜ߒߚ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ߩ⚿ᨐ߅ࠃ߮࿑ߦ␜ߒߚਇ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ߩ⚿ᨐࠍวࠊߖߡ⠨ኤߔࠆߣ㧘ਇ㘻๺⁁ᘒߣߥߞߡ߽㘻๺ᐲ߇㜞޿㜞޿⁁ᘒߢ㑆㓗ਛߩⓨ᳇߇ኽ౉ߐࠇࠆࠃ߁ߥ㧘ࡔ࠾ࠬࠞࠬߩ⊒㆐ߒߥ޿႐วߪ㧘⎕უᔕജ⁁ᘒߪ㘻๺࿯ߩ⎕უ✢਄ࠍ⒖േߒߚᓟߦ⎕უߦ㆐ߒߡ޿ࠆߎߣ
߇ࠊ߆ࠆ㧚߹ߚ㧘㘻๺ᐲ߇ૐߊ࿯☸ሶធὐߢߩࡔ࠾
ࠬࠞࠬ߇⊒㆐ߒߚਇ㘻๺⁁ᘒߩ႐วߪ㧘⎕უ✢ࠍ⿥߃ߡࡇ࡯ࠢᒝᐲߦ㆐ߒߚᓟ㧘⎕უ✢߹ߢᔕജ⁁ᘒ߇ᚯߞߡ޿ࠆ߽ߩߣ⠨߃ࠄࠇࠆ㧚ߎߩࠃ߁ߥ᜼േߩ㆑
޿ߪ㧘᳓ߩࡔ࠾ࠬࠞࠬߦࠃࠅ↢ߓࠆ☸ሶ㑆ઃ⌕ജߩߖࠎᢿᔕജ㨪ゲ߭ߕߺ㑐ଥߪ㧘ਔ⠪ߣ߽න⺞ߥჇടࠍ␜ߒߡߘߩ௑ะߪ߶߷หߓߢ޽ࠅ㧘ࡔ࠾ࠬࠞࠬ᳓
ߩ⊒㆐ߒߚ Sr =53%ଏ⹜૕ߣ Sr㧩53ψ66㧑ଏ⹜૕ߩ႐วߩࠃ߁ߥ㧘ᄢ߈ߥ௑ะߩᄌൻߪ⷗ࠄࠇߥ޿㧚ߎߩߎߣ߽㧘Sr =63㧑ଏ⹜૕ߩ㑆㓗᳓ߩಽᏓ⁁ᘒ߇㧘ࡔ࠾ࠬࠞࠬ᳓߇⊒㆐ߒߚ⁁ᘒߢ޽ߞߚߎߣࠍ␜ߒߡ
޿ࠆ߽ߩߣ⠨߃ࠄࠇࠆ㧚ߥ߅㧘ߎߩࠃ߁ߦផ᷹ߐࠇ
ࠆଏ⹜૕ౝㇱߢߩࡔ࠾ࠬࠞࠬߩ⁁ᴫߩ㆑޿ߪ㧘࿑ D ߩ㑆㓗᳓࿶᜼േߦ߽ᓇ㗀ࠍਈ߃ߡ޿ࠆ߽ߩߣ
⠨߃ࠄࠇࠆ㧚
࿑ C  D ߪਇ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ࠍ↪޿ߚ⹜㛎ߦ߅ߌࠆ᦭ലᔕജ⚻〝ࠍ㧘ߘࠇߙࠇᮮゲߦ(a)p 㧙
uw 㧘(b) p + ps ࠍขߞߡ␜ߒߚ߽ߩߢ޽ࠆ㧚ߥ߅㧘
3.(4)▵ߢㅀߴߚࠃ߁ߦ㧘ߖࠎᢿㆊ⒟ߢߪឃ᳇㕖ឃ᳓᧦ઙߢ޽ࠆߩߢ㧘pnet = p ߣߥࠆ㧚࿑ C ߩ࿑ਛߩታ✢ߪ㧘Sr =53ψ66%ଏ⹜૕ࠍ㒰ߊଏ⹜૕ߩᱷ⇐481

土木学会論文集Ｃ Vol.62 No.2, 471-487, 2006. 5

Void ratio

1.38

1.35

1.34
1.3

1.30

1.25

10

log p (kP a)

(a)
0

1000

2000

3000

Time (min)Complet ely swelling
Unconsolidat ion
No swelling
Incomplet ely swelling

Water content‫( ޓ‬%)Void ratio

1.40

100

54
(b)
52

Pore water pressure (kPa)࿑ ਇ߆ߊੂᴒⓍଏ⹜૕ߩ࿶❗ᦛ✢ᓇ㗀ߦࠃࠆ߽ߩߢ޽ࠅ㧘ਇ㘻๺࿯ౝߩ㑆㓗᳓ಽᏓߩᓇ㗀ࠍ␜ߔ߽ߩߢ޽ࠆ㧚߹ߚ㧘ߎߩ႐วߩ᳓ߩࡔ࠾
ࠬࠞࠬߦࠃࠆ☸ሶ㑆ઃ⌕ജߪ☸ሶߩࠊߕ߆ߥ⒖േߦ
ࠃࠅࡔ࠾ࠬࠞࠬ߇ᶖᄬߔࠆߎߣ߽⠨߃ࠄࠇ 26 㧕 㧘޿ࠊ߫㧘ᒙ޿㧘უࠇ߿ߔ޿☸ሶ㑆ઃ⌕ജߢ޽ࠆ㧚ߘߩᓇ㗀ߪ㧘ᰴ▵ߢ␜ߔਇ߆ߊੂᴒⓍ☼࿯⹜ᢱߩ႐วߩ
ࠃ߁ߥᒝ޿☸ሶ㑆ઃ⌕ജߣߪ㧘ߘߩਈ߃ࠆᓇ㗀߇⇣ߥࠆ߽ߩߣ⠨߃ࠄࠇࠆ㧚

0

1000

2000

3000

Time (min)
0
(c)

-40

-80

0

1000

2000

3000

Time (min)࿑ ਇ߆ߊੂᴒⓍ☼࿯ଏ⹜૕ࠍ↪޿ߚቢోๆ᳓
⹜㛎ߩๆ᳓ㆊ⒟ߢߩ㑆㓗Ყ㧘฽᳓Ყ㧘㑆㓗᳓࿶ߩ⚻ᤨᄌൻ

(3) ਇ߆ߊੂᴒⓍ☼࿯ଏ⹜૕ࠍ↪޿ߚታ㛎⚿ᨐ ࿑㧙 ߪਇ߆ߊੂᴒⓍ☼࿯ଏ⹜૕ߩ╬ᣇ࿶ኒㆊ⒟ߦ߅ߌࠆ࿶❗ᦛ✢ࠍ␜ߒߡ޿ࠆ㧚ᦨᄢ࿶ኒᔕജ
࿑ C  D ߪ㧘ߖࠎᢿㆊ⒟ߦ߅ߌࠆߖࠎᢿᔕജ㧘
117.6kPa ߩᔕജ᧦ઙਅߦ߅޿ߡߪ㧘ଏ⹜૕ߪᱜⷙ࿶
㑆㓗᳓࿶㨪ゲ߭ߕߺ㑐ଥࠍ␜ߒߡ޿ࠆ㧚(b)࿑ߩ㑆㓗ኒ⁁ᘒߦ޽ࠆ߽ߩߣ⠨߃ࠄࠇࠆ㧚᳓ ࿶ ߩ ᜼ േ ࠍ ߺ ࠆ ߣ 㧘 㕖 ࿶ ኒ ଏ ⹜ ૕࿑ C  D  E ߪߘࠇߙࠇ㧘ๆ᳓ㆊ⒟ߩ᜼േߩ
㧔Unconsolidation㧕ߢߪೋᦼߦ㑆㓗᳓࿶ߪ↢ߓߡ߅଀ߣߒߡ㧘ቢోๆ᳓ଏ⹜૕ߩๆ᳓ㆊ⒟ߦ߅ߌࠆ㑆㓗Ყ㧘฽᳓Ყ߅ࠃ߮㑆㓗᳓࿶ߩ⚻ᤨᄌൻࠍ␜ߒߡ޿ࠆ㧚 ࠄߕ㧘ߖࠎᢿߩㅴⴕߣߣ߽ߦᱜߩ㑆㓗᳓࿶߇↢ߓߚᓟߦᷫዋߒߡࠁ߈㧘ゲ߭ߕߺ 3㧑ࠍ⿧߃ߚ޽ߚࠅ߆
࿶ኒᔕജ 117.6kPa ߆ࠄ 19.6kPa ߹ߢߩ㒰⩄ߦࠃࠅ㧘ࠄ㧘⽶ߩ㑆㓗᳓࿶߇⊒↢ߒߡ 15kPa ⒟ᐲߦ⪭ߜ⌕ߊๆ᳓ㆊ⒟೨ߦ⚂ 60kPa ߩ⽶ߩ㑆㓗᳓࿶߇ଏ⹜૕ౝߦ
௑ะࠍ␜ߒߡ޿ࠆ㧚ήๆ᳓ଏ⹜૕㧔No swelling㧕ߢ⊒↢ߒߡ޿ࠆߎߣ߇ࠊ߆ࠆ㧚ߎߩ⊒↢ߒߚ⽶ߩ㑆㓗ߪ⚂ 52kPa ߩ⽶ߩ㑆㓗᳓࿶߇⊒↢ߒ㧘ߖࠎᢿߩㅴⴕ
᳓࿶ߩᄢ߈ߐ߇ዊߐ޿ߩߪ㧘ଏ⹜૕ߩ㘻๺ᐲ߇
ߣߣ߽ߦ⽶ߩ㑆㓗᳓࿶߇ᷫዋߒߡ޿ࠆ㧚߹ߚ㧘ਛㅜ
80㧑⒟ᐲߣૐ޿ߚ߼ߢ޽ࠆߣ⠨߃ࠄࠇࠆ㧚ߎߩ㑆㓗ๆ᳓ଏ⹜૕(Incompletely swelling)ߢߪೋᦼߦ 37kPa
᳓࿶ߪ㧘ๆ᳓㐿ᆎ߇ᆎ߹ࠆߣ⚻ㆊᤨ㑆 500 ಽ⒟ᐲ߹⒟ᐲߩ⽶ߩ㑆㓗᳓࿶߇⊒↢ߒ㧘ቢోๆ᳓ଏ⹜૕
ߢᕆỗߦᷫዋߒߡ޿ࠆ㧚એᓟ㧘㑆㓗᳓࿶ߪ✭߿߆ߦ(Completely swelling)ߢߪೋᦼߩ㑆㓗᳓࿶ߪ࠯ࡠߣߥ
ᷫዋࠍ⛯ߌ㧘ๆ᳓ㆊ⒟⚳ੌઃㄭߦߪ߶߷࠯ࡠߣߥߞ
ߞߡ޿ࠆ㧚ਔ⠪ߣ߽㧘ߖࠎᢿߩㅴⴕߣߣ߽ߦ⽶ߩ㑆ߡ޿ࠆߎߣ߇ࠊ߆ࠆ㧚 ߎߩๆ᳓ㆊ⒟ਛ㧘㑆㓗Ყ㧘㓗᳓࿶߇ᷫዋߒߡᱜߩ㑆㓗᳓࿶ߦߥߞߚᓟ㧘ᱜߩ㑆฽᳓Ყߣ߽ߦ㧘㑆㓗᳓࿶ߩᷫዋഀวߩᄢ߈޿⚻ㆊᤨ㓗᳓࿶߇ᷫዋߔࠆᣇะߦᄌൻߒߡ޿ࠆ㧚ߐࠄߦ㧘ή
㑆 500 ಽ⒟ᐲ߹ߢߪᄌൻ㊂ߪᄢ߈ߊ㧘એᓟߩᄌൻ㊂ๆ᳓㧘ਛㅜๆ᳓㧘ቢోๆ᳓ߩฦଏ⹜૕ߪ㧘ゲ߭ߕߺߪዊߐߊߥߞߡ޿ࠆ㧚ๆ᳓ㆊ⒟㐿ᆎ߆ࠄ⚻ㆊᤨ㑆
3㧑ࠍ⿧߃ߚ޽ߚࠅ߆ࠄ㕖࿶ኒଏ⹜૕ߣหߓ௑ะࠍ
500 ಽઃㄭ߹ߢߩ฽᳓Ყᄌൻ㊂ߪ 0.8㧑⒟ᐲߢ㧘ๆ᳓ࠍ␜ߒߡ޿ࠆߎߣ߇ࠊ߆ࠆ㧚(a)࿑ߩߖࠎᢿᔕജ㨪ゲㆊ⒟⚳ੌᤨ߹ߢߢ߽ 1.2㧑⒟ᐲߢ޽ࠆ㧚ߎߩ⒟ᐲߩ
߭ߕߺ㑐ଥߢߪ㧘ήๆ᳓ଏ⹜૕߇⽶ߩ㑆㓗᳓࿶ߩᓇ฽᳓Ყᄌൻߦࠃࠅ㧘㑆㓗᳓࿶߇ᶖᄬߒߡ޿ࠆߎߣߦ
㗀ߦࠃࠅ㧘Ყセ⊛㜞޿ߖࠎᢿᒝᐲࠍ␜ߒߡ޿ࠆ㧚߹
ߥࠆ㧚

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土木学会論文集Ｃ Vol.62 No.2, 471-487, 2006. 5
200

200

M= 1.67

q (kPa)q (kPa)(a)100Complet ely swelling
Unconsolidat ion
No swelling
Incomplet ely swelling

100

Completely swelling
Unconsolidat ion
No swelling
Incomplet ely swelling0

Pore water pressure uw (kPa)

50

0

1

2
3
4
Axial st rain H a (%)

5

0

6

100
p' (kP a)200࿑ ਇ߆ߊੂᴒⓍ☼࿯ଏ⹜૕ࠍ↪޿ߚ⹜㛎ߦ߅ߌࠆ᦭ലᔕജ⚻〝(b)㕖࿶ኒଏ⹜૕㧔Unconsolidation㧕ߪߖࠎᢿ㐿ᆎߣߣ߽ߦᔕജ⚻〝߇┙ߜ਄߇ࠅ㧘৻ቯߩߖࠎᢿᔕജߦ
㆐ߒߚᓟ㧘ߘߩߖࠎᢿᔕജࠍ଻ߞߚ߹߹㧘㒢⇇⁁ᘒ0✢ߦ㆐ߒߡ޿ࠆߎߣ߇ࠊ߆ࠆ㧚ߎߩࠃ߁ߥ᜼േߦߪ㧘
ၸⓍߦࠃࠅ☼࿯ౝߦ↢ᚑߐࠇߚ᭴ㅧ߇ᓇ㗀ࠍਈ߃ߡ޿ ࠆ ߽ ߩ ߣ ⠨ ߃ ࠄ ࠇ ࠆ 㧚 ৻ ᣇ 㧘 ή ๆ ᳓ 㧔 No
swelling 㧕 ߅ ࠃ ߮ ਛ ㅜ ๆ ᳓ ଏ ⹜ ૕ (Incompletely-50
swelling)ߢߪ㧘ߖࠎᢿೋᦼߦ᦭ߔࠆࠨ࡚ࠢࠪࡦߩᓇ
0
1
2
3
4
5
6
㗀߆ࠄ㧘㕖࿶ኒଏ⹜૕ࠃࠅ߽ᄢ߈ߥᐔဋ᦭ലਥᔕജ
Axial st rain Ha (%)ߩ⁁ᘒ߆ࠄᔕജ⚻〝߇┙ߜ਄߇ࠅ㧘ࡇ࡯ࠢߩߖࠎᢿ
࿑ ਇ߆ߊੂᴒⓍ☼࿯ଏ⹜૕ߩߖࠎᢿㆊ⒟ߦ
ᔕജࠍ␜ߒߚᓟ㧘ߖࠎᢿᔕജ߇ᷫዋߒߥ߇ࠄ㒢⇇⁁߅ߌࠆߖࠎᢿᔕജ㧘㑆㓗᳓࿶㨪ゲ߭ߕߺᘒ✢ߦ㆐ߒߡ޿ࠆ㧚㑐ଥ㕖࿶ኒଏ⹜૕ߣᲧセߔࠆߣ㧘ߎࠇࠄߩଏ⹜૕ߩ႐
ߚ㧘ਛㅜๆ᳓ଏ⹜૕ߪήๆ᳓ଏ⹜૕ߣ߶߷หߓᄢ߈
ว㧘࿶ኒㆊ⒟ߩᓇ㗀ߦࠃࠅ㧘⹜ᢱណขᤨߦ଻ᜬߒߡ
ߐߩߖࠎᢿᒝᐲࠍ␜ߒߚᓟߦ㧘㑆㓗᳓࿶߇ᷫዋߒᆎ
޿ߚ࿯᭴ㅧ߇⎕უߒ㧘ᣂߚߦࠁࠆ޿᭴ㅧ߇ᒻᚑߐࠇ߼ࠆゲ߭ߕߺ 1.5㧑ઃㄭࠃࠅߖࠎᢿᔕജ߽ᷫዋߒߪ
ߚ߇㧘ߖࠎᢿㆊ⒟ߦࠃࠅߘߩ᭴ㅧߪ⚛ᣧߊ⎕უߐࠇߓ߼㧘ᦨ⚳⊛ߦߪ㕖࿶ኒଏ⹜૕ߣ߶߷หߓᄢ߈ߐߩ
ߚ߽ߩߣ⠨߃ࠄࠇࠆ㧚ߔߥࠊߜ㧘㕖࿶ኒଏ⹜૕ߣߩ
ߖࠎᢿᔕജࠍ␜ߒߡ޿ࠆ㧚ቢోๆ᳓ଏ⹜૕ߪ㧘ઁߩ᜼േߩᏅߪ㧘᭴ㅧࠍᒻᚑߔࠆ࿯☸ሶ㑆ઃ⌕ജߩᒝߐଏ⹜૕ࠃࠅ߽߆ߥࠅૐ޿ߖࠎᢿᒝᐲࠍ␜ߒߡ޿ࠆߎ
ߩᏅߣ⠨߃ࠄࠇࠆ㧚㕖࿶ኒଏ⹜૕ߢߪ㧘ၸⓍߦࠃࠅߣ߇ࠊ߆ࠆ㧚ߥ߅㧘࿑ C ߦ߅޿ߡ㧘ਛㅜๆ᳓ଏ
ᒻᚑߐࠇߚᒝ޿☸ሶ㑆ઃ⌕ജ߇૞↪ߒߡ޿ࠆ߽ߩߣ
⹜૕ߩ᜼േ߇ઁߦᲧߴߡ⣀ᕈ⊛ߦ⷗߃ࠆߩߪ㧘એਅ⠨߃ࠄࠇࠆ㧚ߎߩଏ⹜૕ߩ᜼േߪ㧘ήๆ᳓ଏ⹜૕߿
ߩࠃ߁ߦ⠨߃ࠄࠇࠆ㧚ߔߥࠊߜ㧘ήๆ᳓ଏ⹜૕ߦ⷗
ਛㅜๆ᳓ଏ⹜૕ߥߤߩ㧘ၸⓍߦࠃࠆ᭴ㅧ߇⎕უߐࠇࠄࠇࠆ✭߿߆ߥエൻ᜼േ߇㧘ๆ᳓ߦࠃࠆ⽶ߩ㑆㓗᳓ߚᓟߦ㧘⍴޿࿶ኒᤨ㑆ߢᒻᚑߐࠇߚᒙ޿☸ሶ㑆ઃ⌕࿶ߩᶖᄬߦࠃߞߡᄢ߈ߥᒝᐲૐਅߦߟߥ߇ࠆ႐วߪ㧘ജࠍᜬߟ႐วߣߪ᜼േ߇⇣ߥߞߡ޿ࠆ߽ߩߣ⠨߃ࠄቢోๆ᳓ଏ⹜૕ߩࠃ߁ߥ᜼േߣߥࠆ߇㧘ๆ᳓ㆊ⒟߇
ࠇࠆ㧚ቢోๆ᳓ଏ⹜૕ߦ߅޿ߡߪ㧘ၸⓍߦࠃࠅ↢ᚑㅜਛߢ޽ࠆߚ߼㧘ߘߩ⒖ⴕ⁁ᘒߦ޽ࠆߚ߼ߢ޽ࠆߣ
ߐࠇߚ᭴ㅧ߇࿶ኒߦࠃߞߡࠁࠆ޿᭴ㅧߣߥࠅ㧘ߘߩផኤߐࠇࠆ㧚
ᓟߩๆ᳓ㆊ⒟ߦࠃࠅߘߩ᭴ㅧ߇߶ߣࠎߤᶖᄬߒߚ⁁࿑ ߪ㧘ߖࠎᢿㆊ⒟ߦ߅ߌࠆ᦭ലᔕജ⚻〝ࠍᲧᘒߦߥߞߡ޿ࠆ߽ߩߣ⠨߃ࠄࠇࠆ㧚セߒߚ߽ߩߢ޽ࠆ㧚࿑ਛߩ⋥✢ߪ㧘㕖࿶ኒ㧘ቢోๆ߹ߚ㧘⍴޿࿶ኒᤨ㑆ߦࠃࠅᒻᚑߐࠇߚᒙ޿☸ሶ㑆᳓߅ࠃ߮ਛㅜๆ᳓ଏ⹜૕ߩᦨ⚳ᔕജ⁁ᘒߣቢోๆ᳓
ജࠍ᦭ߔࠆߣ⠨߃ࠄࠇࠆήๆ᳓ߥࠄ߮ߦਛㅜๆ᳓ଏ
ଏ⹜૕ߩࡇ࡯ࠢᔕജ⁁ᘒ߆ࠄ᳿ቯߒߚ㧘௑߈ M⹜૕߿㧘ၸⓍߦࠃࠆᒝ޿☸ሶ㑆ജࠍ᦭ߔࠆߣ⠨߃ࠄ
=1.67 ߩ㒢⇇⁁ᘒ✢ߢ޽ࠆ㧚ߥ߅㧘ߎߩ௑߈ M =1.67
ࠇࠆ㕖࿶ኒଏ⹜૕ߩᱷ⇐⁁ᘒߦ߅ߌࠆᔕജὐ߇㧘ๆߪ,ౝㇱ៺ᡂⷺ I 㧩sin-1{(3M)/(6+M)}ߣߔࠆ㑐ଥߦၮ᳓ߦࠃࠅ߶ߣࠎߤ࿯᭴ㅧ߇ᶖᄬߒߚߣ⠨߃ࠄࠇࠆቢ
ߠߊߣ㧘I㧩40.7 ᐲߦ⋧ᒰߔࠆ㧚

483

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150๭߱ߎߣߦߔࠆ㧚'q ߪ㧘ᧄ⎇ⓥߦ߅ߌࠆታ㛎⚿ᨐߦၮߠ߈㧘એਅߩࠃ߁ߦߒߡផቯߔࠆߎߣ߇಴᧪ࠆ
߽ߩߣ⠨߃ࠄࠇࠆ㧚ଏ⹜૕߇ࠨ࡚ࠢࠪࡦࠍᜬߟ႐ว㧘ࠨ࡚ࠢࠪࡦߪ᜔
᧤࿶ߣߒߡ૞↪ߒ㧘ߖࠎᢿᒝᐲࠍჇടߔࠆ㧚࿑ߦ␜ߒߚ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ߩ႐ว㧘ߎߩࠃ߁ߥࠨ
࡚ࠢࠪࡦߩലᨐ߇⃻ࠇߡ㧘ᒝᐲ߇Ⴧടߒߡ޿ࠆ߽ߩ
ߣ⠨߃ࠄࠇࠆ㧚৻ᣇ㧘㘻๺ᐲ߇ૐਅߒߡਇ㘻๺ൻߒߚ႐ว㧘ଏ⹜૕ౝㇱߦߪࡔ࠾ࠬࠞࠬ߇⊒㆐ߔࠆ㧚ߘߩࡔ࠾ࠬࠞࠬߦࠃࠅ↢ߓࠆ☸ሶ㑆ઃ⌕ജߩᓇ㗀ߦࠃࠅଏ⹜૕ߪ᭴ㅧࠍᜬߟߣ⠨߃ࠄࠇ㧘࿑ ߦ␜ߒߚࠃ߁ߦ㧘᦭ലᔕജ⚻〝ߪࡇ࡯ࠢᒝᐲࠍ␜ߒߚᓟߦ⎕უᒝᐲ✢ߦ㆐ߔࠆ㧚߹ߚ㧘ਇ߆ߊੂᴒⓍ☼࿯ଏ⹜૕ߦ߅޿ߡߪ㧘ၸⓍߦࠃࠆ႐วߣ࿶ኒㆊ⒟ߦࠃࠆ႐ว
ߦࠃࠅ᭴ㅧߩᒝߐߩ㆑޿߇޽ࠆ߇㧘࿑ ߦ␜ߒߚࠃ߁ߥ⚿ᨐ߇ᓧࠄࠇߡ޿ࠆ㧚એ਄ߩ⚿ᨐ߆ࠄ್ᢿߒ
ߡ㧘ᰴߩࠃ߁ߥ઒ቯࠍ⠨߃ࠆ㧚ߔߥࠊߜ㧘ήๆ᳓ଏ⹜૕ߩᦨᄢߖࠎᢿᔕജὐߣᱷ⇐ᒝᐲߣߩᏅࠍ⹜ᢱ߇
ᜬߟ᭴ㅧߩᶖᄬߦࠃߞߡ⿠ߎࠆᒝᐲૐਅ㊂'q㨏ߣߒ㧘ήๆ᳓ߩߖࠎᢿ⚳ੌᤨߩᒝᐲߣቢోๆ᳓ߩᦨᄢߖࠎ
ᢿᔕജὐߩᏅࠍ㑆㓗᳓࿶(ࠨ࡚ࠢࠪࡦ)ߩᶖᄬߦࠃࠆ
ᒝᐲૐਅ㊂'q㨟ߣߔࠆߎߣߦࠃࠅ㧘'q ߪᰴᑼߢ⴫ߐ
ࠇࠆ߽ߩߣߔࠆ㧚'q 'qs  'qc    (3)'qc

q (kPa)'qs 'q
100(a)Pore water pressure uw (kPa)50
50Completely sw elling
No sw elling

0

'u w

(b)

-50
0

2

4

6

8

Axial strain H a (%)
200
M=1.67q (kPa)'qc
100

'q s'qߚߛߒ㧘 'qs ߪ㘻๺⁁ᘒߦኻߒߡߪ㧘 

'qs

(c)
0

100
p' (kPa)

200

M 'p c§ 'V·
M ¨ 1  'uw ¸    (4)3©
¹߹ߚ㧘ਇ㘻๺⁁ᘒߩߣ߈ߪ㧘 'qs࿑ ᒝᐲૐਅ㊂ߩផቯᣇᴺߩ⠨߃ᣇోๆ᳓ଏ⹜૕ߩࡇ࡯ࠢᤨߩᔕജὐߣߣ߽ߦ㧘p̉㨪q㕙਄ߢ৻ߟߩ⋥✢਄ߦಽᏓߔࠆ௑ะࠍ␜ߒߡ޿ࠆ㧚ߎߩ⚿ᨐߪ㧘ᱷ⇐⁁ᘒߦ߅޿ߡ☸ሶ㑆ജߦࠃࠆ᭴ㅧ
߇ᶖᄬߒߚߎߣࠍ␜ߒߡ޿ࠆ߽ߩߣ⠨߃ࠄࠇࠆ㧚M ' p  ps§ 'V·
M ¨ 1  'ps ¸   (5)© 3¹એ਄߆ࠄ㧘ᑼ(3)ߦၮߠ޿ߡๆ᳓ߦࠃࠆᒝᐲૐਅ㊂ߩ▚ቯࠍએਅߦ⹜ߺࠆ㧚ߥ߅㧘ᑼ(3)ਛߩ'q㨏ߪㅢᏱ㧘✵ࠅ㄰ߒߚ㘻๺⹜ᢱߢߪ࠯ࡠߦߥࠆߣ⠨߃ࠄࠇࠆ㧚ߒ߆ߒ㧘࿑ ߦ⷗ࠄࠇࠆࠃ߁ߦ㧘ࠬ࡜࡝࡯⁁ᘒ߆ࠄ࿶ኒߒߚ㘻๺⹜ᢱߢ޽ߞߡ߽వⴕᔕജࠍਈ߃ࠆߎߣߦࠃߞߡㆊ࿶ኒൻ
߇↢ߓߚࠅ㧘ੇ῎ߔࠆߎߣߢࡔ࠾ࠬࠞࠬ߇⊒㆐ߒߡ㧘☸ሶ㑆ઃ⌕ജߩᓇ㗀ߦࠃࠅ᭴ㅧࠍᜬߟ႐ว߇޽ࠆ㧚ߎߩ᭽ߥ႐วߦߪ㧘'q㨏߇ሽ࿷ߔࠆ߽ߩߣ⠨߃ࠄࠇࠆ㧚ߘߩ႐วߪ㧘'q㨏ߪߖࠎᢿᔕജ㨪ゲ߭ߕߺᦛ✢ࠃࠅታ᷹ߔࠆ߽ߩߣߔࠆ㧚⴫ ߪ㧘੹࿁ߩ⹜㛎⚿ᨐߦߟ޿ߡๆ᳓ߦࠃࠆᒝ
ᐲૐਅ㊂ߩផቯࠍ⹜ߺߚ⚿ᨐߢ޽ࠆ㧚޿ߕࠇߩଏ⹜
૕߽ቢోๆ᳓ଏ⹜૕ߦኻߔࠆᒝᐲૐਅ㊂ࠍ▚ቯߒߡ(4) ๆ᳓ߦࠃࠆᒝᐲૐਅ㊂ߩផቯ࿑ ߪ㧘ਇ߆ߊੂᴒⓍ☼࿯ଏ⹜૕ߩߖࠎᢿㆊ⒟ߦ߅ߌࠆ㧘ߖࠎᢿᔕജ㧘ࠨ࡚ࠢࠪࡦ߅ࠃ߮᦭ലᔕജ⚻〝ࠍᲧセߒߚ߽ߩߢ޽ࠆ㧚࿑ਛߩٌශߪ╬ᣇ࿶ኒᓟߦ㕖ឃ᳓ߢ㒰⩄ࠍⴕ߁ߎߣߦࠃࠅ⊒↢ߒߚ⽶ߩ㑆㓗᳓࿶߇᜔᧤࿶ߣߒߡ૞↪ߒߡ޿ࠆήๆ᳓ଏ⹜૕
(No swelling) ߩ㧘ٖශߪ⽶ߩ㑆㓗᳓࿶߇ቢోߦߥߊ
ߥࠆ߹ߢๆ᳓ࠍⴕߞߚቢోๆ᳓ଏ⹜૕(Completely
swelling)ߩ⚿ᨐࠍߘࠇߙࠇ␜ߒߡ޿ࠆ㧚ߎߎߢ㧘ฦଏ⹜૕㑆ߦ߅ߌࠆߖࠎᢿᔕജߩᦨᄢ୯ߩᏅࠍ'q ߣ484

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⴫ ๆ᳓ߦࠃࠆᒝᐲૐਅ㊂ߩផቯ

SaturatedkaolineUnsaturated
kaoline

ǻqs
=ǻq

ǻqc
ǻq
ǻı1䋯3 ǻqcmeasured - measured +M(ǻı1䋯3-ǻuw)䋨䌫Pa) 䋨䌫Pa)
(kPa)
ǻqc
(kPa)
䋨䌫Pa)

ǻqc
ǻps
+M(ǻı1䋯3+ǻps)
(kPa)
(kPa)

Test name

ǻuw
䋨䌫Pa)

Incompletely
swelling

-16.7

27.5

0.0

82.4

82.4

72.4

-

-

No swelling

-12.8

33.5

11.2

100.4

111.6

87.1

-

-

Sr=53%

-73.7

43.8

28.5

131.5

160.0

-

28.70

147.5

Sr=63%

-43.8

30.2

0.0

90.6

90.6

-

12.10

69.4

No swelling

-15.5

13.7

8.0

41.0

49.0

56.7

-

-

Unconsolidation

-5.3

10.7

0.0

32.1

32.1

26.7

-

-

Ǎq c+M(Ǎǻ 1㧛3-Ǎu w), Ǎq c+M(Ǎǻ 1㧛3+Ǎp s)(kPa)

Alluvial clay

5.⚿⺰

200
Saturated kaoline
Unsaturated kaoline
alluvial clayᧄ⎇ⓥߢߪ㧘ๆ᳓ㆊ⒟߇ਇ㘻๺࿯ߩᒝᐲߦਈ߃ࠆ
ᓇ㗀ࠍ⺞ߴࠆߚ߼ߦ㧘ࠬ࡜࡝࡯⁁ᘒ߆ࠄਈ࿶ኒߒߚ
ࠞࠝ࡝ࡦ⹜ᢱ߅ࠃ߮ਇ߆ߊੂᴒⓍ☼࿯⹜ᢱࠍ↪޿ߡ㧘ๆ᳓ㆊ⒟ࠍ฽߼ߚૐ᜔᧤࿶ਅߦ߅ߌࠆ㕖ឃ᳓ߖࠎᢿ
⹜㛎ࠍⴕߞߚ㧚ᧄ⎇ⓥߦࠃߞߡᓧࠄࠇߚ⚿ᨐߪ㧘એਅߩࠃ߁ߦ߹ߣ߼ࠄࠇࠆ㧚1. ࠨ࡚ࠢࠪࡦࠍ᦭ߔࠆ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ߩ᦭ല
ᔕജ⚻〝ߪ㧘ᦨᄢߖࠎᢿᔕജߢ␜ߐࠇࠆ⎕უ✢ߦ㆐ߒߚᓟߦ⎕უ✢ߦᴪߞߡ਄᣹ߒߡߖࠎᢿᒝ
ᐲࠍჇടߒߚᓟߦ⎕უߔࠆߣ޿߁௑ะࠍ␜ߒߚ㧚ߥ߅㧘ߎߩ᭽ߥ௑ะߪ㧘ㆊ෰ߩ⹜㛎⚿ᨐߣห᭽ߢ޽ࠆߣ⠨߃ࠄࠇࠆ㧚2. 㘻๺ࠞࠝ࡝ࡦଏ⹜૕ߪ㧘⌀ⓨ⫳⊒ᴺߦࠃࠅੇ῎ߒߡ㘻๺ᐲ߇ૐਅߔࠆߣ㧘ߖࠎᢿㆊ⒟ߢߩᔕജ
㨪߭ߕߺ㑐ଥߩ௑ะ߇ᄌൻߒߡ᣿ࠄ߆ߥࡇ࡯ࠢ
ᒝᐲࠍ␜ߒߚ㧚ߎࠇߪ㧘ࡔ࠾ࠬࠞࠬ᳓ߦࠃࠅ↢ߓࠆ☸ሶ㑆ઃ⌕ജߩᓇ㗀ߢ޽ࠅ㧘㑆㓗᳓ಽᏓߩ㆑޿߇᜼േߦᓇ㗀ࠍਈ߃ߚ߽ߩߣ⠨߃ࠄࠇࠆ㧚3. వⴕ࿶ኒᔕജࠍਈ߃ߡ㒰⩄ߒߚᓟ㧘ๆ᳓ߐߖߚ
ਇ߆ߊੂᴒⓍ☼࿯ଏ⹜૕ߢߪ㧘ߖࠎᢿㆊ⒟ߢ⎕უ✢ࠍ⿧߃ࠆࡇ࡯ࠢᒝᐲࠍ␜ߐߥ߆ߞߚ㧚ߎߩ⃻⽎ߪ㧘ๆ᳓ߦࠃߞߡ࿕⚿ᚑಽߦࠃࠆ᭴ㅧ߇፣
უߒߚߚ߼ߢ޽ࠆߣ⠨߃ࠄࠇࠆ㧚4. ๆ᳓ጁᱧߩ⇣ߥࠆଏ⹜૕ߩߖࠎᢿᒝᐲࠍᲧセᬌ⸛ߒߚ⚿ᨐ㧘ๆ᳓ߦࠃߞߡ↢ߓࠆᒝᐲૐਅ㊂ߪ㧘࿕⚿ᚑಽߦࠃࠆ᭴ㅧ߇፣უߔࠆߎߣߦࠃࠆᒝᐲ
ૐਅ㊂ߣࠨ࡚ࠢࠪࡦߩૐਅߦࠃࠆᒝᐲૐਅ㊂ߦಽߌߡ⠨߃ࠆߎߣ߇น⢻ߢ޽ࠆߎߣ߇ಽ߆ߞߚ㧚5. ਇ߆ߊੂᴒⓍ☼࿯⹜ᢱߩ㕖࿶ኒଏ⹜૕ߩ᦭ലᔕ
ജ⚻〝ߪ㧘ήๆ᳓ଏ⹜૕߿ਛㅜๆ᳓ଏ⹜૕㧘ߥ

100

0

0

100

200

Ǎq‫ޓ‬measured (kPa)࿑ ᒝᐲૐਅ㊂'q ߩታ᷹୯ߣ⸘▚୯ߩᲧセ߅ࠅ㧘⴫ਛߩ'uw㧘'V 1/3㧘'q㨏ߥࠄ߮'q measured ߪ㧘ታ᷹୯ࠍߘࠇߙࠇ␜ߒߡ޿ࠆ㧚߹ߚ㧘'q 㨏+M ('V 1㧛3-'uw) ߥࠄ߮ߦ 'q㨏+ M ('V 1㧛3+'ps) ߪ㧘ታ᷹୯ߦၮߠߊᑼ㧔 3 㧕ߩ⸘▚୯ࠍ␜ߒߡ޿ࠆ㧚࿑ߪ㧘ᑼ (3) ࠍㆡ↪ߒߡᓧࠄࠇߚᒝᐲૐਅ㊂ߩ▚ቯ୯'q ߣ㧘ታ㛎⚿ᨐ߆ࠄ⋥ធ᳞߼ߚᒝᐲૐਅ㊂'q measuredࠍᲧセߒߚ߽ߩߢ޽ࠆ㧚ߥ߅㧘࿑ਛߩὐ✢ߪ⺋Ꮕ
r10% ࠍ⴫ߒߡ޿ࠆ㧚ߎߩ⚿ᨐ߆ࠄ㧘 ᑼ㧔3㧕ߦၮߠ߈㧘ๆ᳓ߦࠃࠆᒝᐲૐਅ㊂ߩផቯ߇ r10% ⒟ᐲߩ
♖ᐲߩ߽ߣߢน⢻ߢ޽ࠆߎߣ߇␜ߐࠇߚ߽ߩߣ⠨߃
ࠄࠇࠆ㧚

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6.

7.

ࠄ߮ߦਇ㘻๺ࠞࠝ࡝ࡦଏ⹜૕ߣ⇣ߥࠆ௑ะࠍ␜
ߒߚ㧚ߎࠇߪ㧘㕖࿶ኒଏ⹜૕ߦߪၸⓍߦࠃࠅᒻᚑߐࠇߚᒝ޿☸ሶ㑆ઃ⌕ജ߇૞↪ߒ㧘ᓟ⠪ߩ 3ࠤ࡯ࠬߩ႐วߪ㧘ᒙ޿☸ሶ㑆ઃ⌕ജ߇૞↪ߒߚߚ߼ߣ⠨߃ࠄࠇࠆ㧚ࠨ࡚ࠢࠪࡦࠍ᷹ቯߒߚ㕖ឃ᳓ߖࠎᢿ⹜㛎ࠍⴕ߁ߎߣߦࠃߞߡ㧘㘻๺࡮ਇ㘻๺⁁ᘒߦ߆߆ࠊࠄߕ,ૐ᜔᧤࿶ਅߦ߅ߌࠆๆ᳓ߦࠃࠆᒝᐲૐਅ㊂ࠍ▚ቯߢ߈ࠆน⢻ᕈ߇޽ࠆߎߣ߇␜ߐࠇߚ㧚ᱷ⇐ᒝᐲ․ᕈߪ㧘ࠨ࡚ࠢࠪࡦᔕജࠍ⠨ᘦߒߚᐔဋ᦭ലਥᔕജߦࠃࠅ㘻๺࡮ਇ㘻๺⁁ᘒߦ߆߆ࠊ
ࠄߕ࡙࠾࡯ࠢߦᢛℂߐࠇࠆ௑ะࠍ␜ߒߚ㧚90, 2000.
10) Fredlund, D.G., Morgenstern, N.R. and Widger, R.A.: The
shear strength of unsaturated, Canadian Geotechnical
Journal, Vol.15, pp.313- 321, 1978.
11) Fredlund, D.G. and Rahardjo, H.: Soil mechanics forunsaturated soils, John Wiley & Sons, p.220, 1993.
12) 㒙ㇱᑝผ㧦ਇ㘻๺࿯ߩജቇ․ᕈߩ⹏ଔᣇᴺߦ㑐ߔࠆታ㛎⊛⎇ⓥ㧘᧲੩ᄢቇቇ૏⺰ᢥ, pp. 202-221, 1994.
13) Vanapalli, S.K., Fredlund, D.G., Pufahl, M.D. and Clifton,
A.W.: Model for prediction of shear strength with respect
to soil suction, Canadian Geotechnical. Journal, Vol.33,
No.3, pp379-392, 1996.
14) ቝ㊁ዏ㓶㧘ችਅ㜞ᤘ㧦ᶐ᳓ߦࠃࠆਇ㘻๺࿯ߩᒝᐲૐ

⻢ㄉ㧦ᧄ⺰ᢥߩ૞ᚑߦ㑐ߒߡᓮഥ⸒޿ߚߛ߈߹ߒߚ
␹ᚭᄢቇᎿቇㇱ ᷦ⼱ ໪ ᢎ᝼ߦᗵ⻢⥌ߒ߹ߔ㧚߹ߚታ㛎ߦᓮදജ޿ߚߛ߈߹ߒߚ㧘␹ᚭᄢቇㇺᏒ቟ో⎇ⓥ࠮ࡦ࠲࡯ 㘵Ⴆ ᢕ ᢎ᝼㧘ߥࠄ߮ߦ␹ᚭᄢቇᎿቇㇱᴡ੗సਯ ഥᚻߦᗵ⻢⥌ߒ߹ߔ㧚ਅߦߟ޿ߡ㧘࿯ߣၮ␆㧘Vol.29, No.6, pp.41-48㧘1981.
15) ห਄ 12)㧘pp.134-144.
16) ᄢႦ ᖗ㧘ች↰ༀ㇚㧘ጤㇱ ม㧦㑆㓗᳓࿶タ⩄⹜㛎ߦࠃࠆ☼ᕈ࿯ߩߖࠎᢿ⎕უᯏ᭴㧘࿾ߔߴࠅ㧘Vol.37,
No.4, pp.10-17, 2001.
17) Orense, R., Farooq, K. and Towhata, I.: Deformation

ෳ⠨ᢥ₂
1)

behavior of sandy slopes during rainwater infiltration, Soils
and Foundations, Vo.44, No.2, pp.15-30, 2004.

ዊᯅẴᴦ㧘૒‫ޘ‬ᕶੑ㧦࿾ߔߴࠅ࡮ᢳ㕙ἴኂࠍ㒐ߋߚ߼ߦ㧘ጊᶏၴ㧘pp.49-55, 1990.

2)18) ੗਄෹ඳ㧘᪢ፒஜᄦ㧘ᴡ᧛ 㓉㧦⌀ⓨ⫳⊒ᴺߢ૞⵾଀߃߫Jennings, J.E. and Bnrland, J.B.: Limitations to theߒߚਇ㘻๺☼࿯ଏ⹜૕ߩ࿶ኒ࡮ᒝᐲ․ᕈ㧘╙38࿁࿾

use of effective stresses in partly saturated soils,⋚Ꮏቇ⎇ⓥ⊒⴫ળᐔᚑ15ᐕᐲ⊒⴫⻠Ṷ㓸㧘࿾⋚Ꮏቇ

Geotechnique, Vol.12, No.2, pp.125-144, 1962.
3)

ળ㧘462㧘pp.923-924, 2003.
19) ࿾⋚Ꮏቇળ✬:ਇ㘻๺࿾⋚ߩ᜼േߣ⹏ଔ㧘⾗ᢱ✬2.3.1

଀߃߫⑔↰ ⼔㧦ᶐ᳓ߦ઻߁࿯ߩߖࠎᢿᛶ᛫ߩૐਅ
ߣ⋓࿯ᢳ㕙ߩ቟ቯ⸃ᨆ㧘࿯ᧁቇળ⺰ᢥႎ๔㓸㧘Vol.18,

ਃゲ࿶❗⹜㛎㧘pp.206-208㧘2004.

No.3, pp.155-168, 1978㧚
4)20) ട⮮ᱜม㧘ศ᧛ఝᴦ㧘ᴡ੗సਯ㧘ኸ↰ ਗ਼㧦ਇ㘻๺Hashimoto, T., Nagaya, J., Kishio, T. and Shiotani,࿯ߩ৻ゲ࿶❗⹜㛎ᤨߩᒝᐲ․ᕈߦ෸߷ߔࠨ࡚ࠢࠪࡦ

T.:Investigation of Strength Degrading due to Swelling ofߩᓇ㗀㧘࿯ᧁቇળ⺰ᢥ㓸, No.687/III-56, pp.201-218㧘

then

2001.

Groundin

Excavation,

Proceeding

International Conference on Foundation

of

the

Failures,21) ห਄ 5)㧘╙7✬ 3.3╬ᣇᔕജࠍട߃ߚ࿯ߩਃゲ⹜㛎㧘

pp.393-397, 1997.
5)

6)

7)

pp.462-500.

࿾⋚Ꮏቇળ✬:࿯⾰⹜㛎ߩᣇᴺߣ⸃⺑㧙╙৻࿁ᡷ

㧙㧘 22) ἑญဋ㧦⇣ᣇ࿶ኒߐࠇߚਇ㘻๺☼ᕈ࿯ߩജቇ․ᕈ㧘╙ 7 ✬  3.5 ਇ 㘻 ๺ ࿯ ߩ ਃ ゲ ࿶ ❗ ⹜ 㛎 㧘 pp.524-541,

␹ᚭᄢቇᄢቇ㒮⥄ὼ⑼ቇ⎇ⓥ⑼㧘ඳ჻೨ᦼ⺖⒟ቇ૏

2000.

⺰ᢥ㧘2000.

シㇱᄢ⬿㧘ട⮮ᱜม㧘ᵿ↰⠹৻㧘ᧄ↰㆏⼂㧦ਇ㘻๺23) Toll, D.G. and Ong, B.H.:Critical-state parameters for an࿯ߩ㑆㓗᳓ߩ⁁ᘒߣ࿯႙ߩജቇ⊛᜼േߩ㑐ଥߦߟ޿

unsaturated residual sandy clay, Geotechnique, Vol.53,

ߡ㧘࿯ᧁቇળ⺰ᢥ㓸㧘No.535/III-34㧘pp.83-92㧘1996.

No.1, pp.93-103, 2003.
24) Shimizu, M. and Tabuchi, T.:Effective stress behavior of

Sugii, T. Yamada, K. and Kondou, T. Relationshipbetween soil-water characteristic curve and void ratio,

clays in unconfined compression

Proceedings

Foundations, Vol.33, No.3, pp.28-39, 1993.

of

3rd

Iinternational

Conferenceontests, Soils

and25) ട⮮ᱜม㧘ጊᧄୃ৻㧘㊁ਗ ⾫㧦☸ሶ㑆ઃ⌕ജࠍข

Unsaturated Soils, Vol.1, pp.209-214, 2002.
8)᧲ጊ ാ㧘⍹↰᦮㕏㧦pFߩၮᧄ⊛ᗧ๧ (ߘߩ2㧕㧘࿯ࠅ౉ࠇߚ୘೎ⷐ⚛ᴺߦࠃࠆੑゲ࿶❗⹜㛎ࠪࡒࡘ࡟࡯

ߣၮ␆㧘Vol.34, No.12, pp.71-76㧘1986.

࡚ࠪࡦߣਇ㘻๺࿯ߩਃゲ࿶❗⹜㛎ߩᲧセ㧘࿯ᧁቇળ

9)

Kato, S. and Kawai, K.: Deformation characteristics of aᔕ↪ജቇ⺰ᢥ㓸, Vol.2, pp.419-426㧘2000.

compacted clay in collapse under isotropic and triaxial

26) ട⮮ᱜม㧘᭏ේㄖ㓶㧘⇌ਛᙗᒾ㧦ਃゲ⹜㛎ᤨߩਇ㘻

stress state, Soils and Foundations, Vol.40, No.5, pp.75-

๺⍾ߩᄌᒻᒝᐲ․ᕈߦਈ߃ࠆࠨ࡚ࠢࠪࡦߩᓇ㗀ߦ㑐

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土木学会論文集Ｃ Vol.62 No.2, 471-487, 2006. 5

ߔ ࠆ ၮ ␆ ⊛ ⎇ ⓥ 㧘 ࿯ ᧁ ቇ ળ ⺰ ᢥ 㓸 , No.785/III-70,
pp.93-106㧘2005.

㩿㪉㪇㪇㪌㪅㩷㪍㪅㩷㪉㪈㩷 ฃઃ㪀㩷

EFFECT OF SUCTION REDUCTION CAUSED BY WETTING PROCESS ON
SHEAR STRENGTH CHARACTERISTICS UNER LOW CONFINING PRESSURE
Shoji KATO, Takahiro KONDA and Hiroyuki SHINKAI
In this study, triaxial compression test under low confining pressure and undrained state were carriedout for saturated and unsaturated kaoline specimens and undisturbed sample, to study the effect of suction
reduction caused by wetting process, and effective stress path shear and strength characteristics were
examined. From the test results, it was found that the intergranular adhesive force between soil particles
affects on the peak strength, and that the residual strengths were arranged uniquely for the effective meanstress taking the suction stress as confining pressure. And we proposed one prediction method for thestrength reduction caused by decrease of suction during wetting process.

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