㻌➨  ᅇᅵ◁⅏ᐖ࡟㛵ࡍࡿࢩ࣏ࣥࢪ࣒࢘ㄽᩥ㞟㸪 ᖺ  ᭶㻌୙㣬࿴ᾐ㏱ࢆ⪃៖ࡋࡓ↓㝈ᩳ㠃ἲ࡟࠾ࡅࡿ
ᾐ㏱ຊࡢィ⟬᪉ἲ࡟㛵ࡍࡿ୍⪃ᐹSTUDY ON CALCULATION METHOD OF SEEPAGE FORCE IN THE INFINITESLOPE METHOD CONSIDERING UNSATURATED SEEPAGE㻌᮰ඖ ኱௓ ࣭㓇ໝ ୍ᡂ ࣭ఀ⸨ ┿୍ Daisuke TSUKAMOTO䠈 Kazunari SAKO䠈 Shinichi ITO㮵ඣᓥ኱Ꮫ኱Ꮫ㝔⌮ᕤᏛ◊✲⛉㸦ࠛ 㮵ඣᓥᕷ㒆ඖ 㸧E-mail: k9804722@kadai.jp㮵ඣᓥ኱ᏛᏛ⾡◊✲㝔⌮ᕤᏛᇦᕤᏛ⣔㸦ࠛ 㮵ඣᓥᕷ㒆ඖ 㸧

E-mail: sako@oce䠊kagoshima-u.ac.jp㮵ඣᓥ኱ᏛᏛ⾡◊✲㝔⌮ᕤᏛᇦᕤᏛ⣔㸦ࠛ 㮵ඣᓥᕷ㒆ඖ 㸧E-mail: itou@oce䠊kagoshima-u.ac.jp
㻌Key Words: slope stability analysis䠈 unsaturated soil䠈 seepage force㻌㸬ࡣࡌࡵ࡟ࡓỈᅽἲࢆࡑࢀࡒࢀᥦ᱌ࡋ㸪ࡑࡢጇᙜᛶࢆ᳨ウࡋࡓ㸬ࡋ࠿ࡋ㸪ຊᏛⓗຠᯝࡀྠࡌ࡛࠶ࡿࡣࡎࡢయ✚ຊἲ㸦୙ ⌧ᅾ㸪඲ᅜⓗ࡟ከⓎࡍࡿᒁᡤⓗ࡞㇦㞵࡟ࡼࡗ࡚㸪㣬࿴ᅵ୰ࡢᾐ㏱ຊ࡜ᅽຊỈ㢌ᕪ࡟ࡼࡿయ✚ຊࢆ⪃៖㸧ᩳ㠃ᔂቯࡀ⏕ࡌ࡚࠸ࡿ㸬ᩳ㠃ᔂቯ࡟ࡼࡿேⓗ⿕ᐖࢆ࡜Ỉᅽἲ㸦୙㣬࿴ᅵ୰ࡢ㈇ࡢ㛫㝽Ỉᅽࢆ⪃៖㸧࠿ࡽ㍍ῶࡍࡿࡓࡵ࡟ࡣ㸪㝆㞵࡟కࡗ࡚᫬ࠎ้ࠎ࡜ኚ໬ࡍ⟬ฟࡉࢀࡿᏳ඲⋡ࡀ୍⮴ࡋ࡞࠸࡜࠸࠺ㄢ㢟ࡀ⏕ࡌࡓ㸬ࡿᩳ㠃ࡢᏳᐃᛶࢆᐃ㔞ⓗ࡟ホ౯ࡍࡿᚲせࡀ࠶ࡿ㸬ࡑࡑࡇ࡛㸪ࡑࡢㄢ㢟ࡢཎᅉࡢ୍ࡘ࡛࠶ࡿ㈇ࡢ㛫㝽Ỉᅽࡇ࡛㸪ࡇࢀࡲ࡛࡟㝆㞵᫬ࡢᩳ㠃Ᏻᐃゎᯒ࡟㛵ࡍࡿࡀస⏝ࡍࡿ᩿㠃✚ࡢᙳ㡪ࡀ᳨ウࡉࢀ࡚ࡁࡓ 7)㸬

ᵝࠎ࡞◊✲ࡀࡉࢀ࡚ࡁࡓ 1)㸪2)㸬1960 ᖺྎᚋ༙࡟ࡣ㸪ᮏㄽᩥ࡛ࡣ㸪య✚ຊἲ࡜Ỉᅽἲࡢィ⟬⤖ᯝࡢ⢭ᗘࣃ࣮ࢯࢼࣝࢥࣥࣆ࣮ࣗࢱ࣮ࢆ⏝࠸ࡓᩳ㠃Ᏻᐃゎᯒࡀྥୖࡢࡓࡵ㸪ᩳ㠃Ᏻᐃゎᯒ࡟࠾ࡅࡿ୙㣬࿴ᇦࡢᾐ㏱

ᩘከࡃ⾜ࢃࢀࡿࡼ࠺࡟࡞ࡾ㸪⌧ᅾࡣ㸪୙㣬࿴ᾐ㏱ゎຊࡢィ⟬᪉ἲ࡟ࡘ࠸࡚ぢ┤ࡍ㸬ලయⓗ࡟㸪୙㣬࿴ᇦᯒ࡜ᩳ㠃Ᏻᐃゎᯒࢆ⤌ࡳྜࢃࡏࡓゎᯒࡀከࡃ⏝࠸ࡽࡢᾐ㏱ຊࡣ㸪ࡍ࡭ࡾᅵሢࢆ㧗ࡉ᪉ྥ࡟➼㛫㝸࡛ศ๭3)㸪4)㸪5)

㸬ᴟ㝈ᖹ⾮ἲ࡟ᇶ࡙ࡃᩳ㠃Ᏻᐃゎᯒࡍࡿࡇ࡜࡛ィ⟬ࡉࢀࡿ㸬ࡋ࠿ࡋ㸪ศ๭ᩘࢆࡼࡾ⣽࠿ࡢᘧ࡛ࡣ㸪୍⯡࡟ᆅୗỈ఩௨ୗࡢ㣬࿴ᇦ࡟࠾ࡅࡿᾐࡃタᐃࡍࡿ࡜㸪୙㣬࿴ᇦࡢᾐ㏱ຊࡣ࠶ࡿ್࡟཰᮰ࡍ

㏱ຊࡸ㛫㝽Ỉᅽ࡟ࡼࡿຊࡣ⪃៖ࡉࢀ࡚࠸ࡿ㸬ࡋ࠿ࡋ㸪ࡿ࡜⪃࠼ࡽࢀࡿࡀ㸪᪤ ࡢ◊✲࡛ࡣ㐺ษ࡞ศ๭ᩘ࡟ᆅୗỈ఩௨ୖࡢ୙㣬࿴ᇦ࡟࠾࠸࡚㸪ࡍ࡭ࡾᅵሢࡢ㔜ࡘ࠸࡚ࡢ㆟ㄽࡣࡉࢀ࡚࠸࡞࠸㸬㔞ィ⟬ࡣ㣬࿴ᗘศᕸ࠿ࡽᐜ᫆࡟ィ⟬࡛ࡁࡿࡀ㸪୙㣬 ࡑࡇ࡛㸪ὠᒣࡽࡢᥦ᱌ࡍࡿ୙㣬࿴ᾐ㏱ࢆ⪃៖ࡋࡓ࿴ᅵ୰ࡢỈࡢὶࢀ࡟㛵ࡍࡿྲྀࡾᢅ࠸ࡀ୙᫂☜࡛࠶ࡿ㸬ᩳ㠃Ᏻᐃゎᯒࡢ↓㝈ᩳ㠃ἲ 7)࡟ࡘ࠸࡚㸪୙㣬࿴ᇦࡢࡑࡇ࡛㸪Sako ࡽ 6)ࡣ㸪୙㣬࿴ᅵ୰࡟స⏝ࡍࡿᾐ㏱

ᾐ㏱ຊࢆィ⟬ࡍࡿ㝿ࡢ㐺ษ࡞ศ๭ᩘ࡟ࡘ࠸࡚᫂ࡽ࠿ຊࡸᅽຊỈ㢌ᕪ࡟ࡼࡿయ✚ຊࢆᥦ᱌ࡋ㸪㠀෇ᘼࡍ࡭࡟ࡍࡿ㸬ࡑࡢࡓࡵ㸪᪤ ◊✲࡜ྠᵝࡢゎᯒ᮲௳ࢆ⏝ࡾἲࡢ Janbu ἲ࡬ࡢ㐺⏝ࢆヨࡳ࡚࠸ࡿ㸬ࡉࡽ࡟㸪ὠ࠸࡚㸪ศ๭ᩘࡢ㐪࠸ࡀ୙㣬࿴ᇦ࡟స⏝ࡍࡿᾐ㏱ຊࡢ

ᒣࡽ್ࡸయ✚ຊἲ࡜ỈᅽἲࡢᏳ඲⋡࡟୚࠼ࡿᙳ㡪ࢆ⪃ᐹࢀ࡚࠸ࡿ7)ࡣ㸪ᴟ㝈ᖹ⾮ἲࡢ୍ࡘ࡛࠶ࡿ↓㝈ᩳ㠃ἲ࡟࠾࠸࡚㸪୙㣬࿴ᅵ୰ࡢᾐ㏱ຊ࡜ᅽຊỈ㢌ᕪ࡟ࡼࡿయ✚ࡍࡿ㸬ຊࢆ⪃៖ࡋࡓయ✚ຊἲ࠾ࡼࡧ㈇ࡢ㛫㝽Ỉᅽࢆ⪃៖ࡋ― 37 ―㸬య✚ຊἲ࡜Ỉᅽἲ࡟࠾ࡅࡿ↓㝈ᩳ㠃ἲୖࡢ୙㣬࿴ᇦࡢᙳ㡪ࡣ㔜㔞 W ࡟཯ᫎࡉࢀ࡚࠸ࡿࡀ㸪㛫㝽Ỉᅽࡢྲྀࡾᢅ࠸ࡣ୙᫂☜࡛࠶ࡿ㸬ࡍ࡭ࡾ㛗ࡉࡀࡍ࡭ࡾ῝ࡉ࡟ᑐࡋ࡚༑ศ኱ࡁ࠸ࡼ࠺࡞ᩳ㠃࡟ᑐࡋ࡚㸪ࡍ࡭ࡾ㠃ࢆ┤⥺࡜௬ᐃࡍࡿ↓㝈ᩳ㸬↓㝈ᩳ㠃ἲ࡟࠾ࡅࡿ୙㣬࿴ᾐ㏱ࡢྲྀࡾᢅ࠸

㠃ἲࢆ⏝࠸ࡓᩳ㠃Ᏻᐃゎᯒࢆ⾜࠺㸬ᅗ-1 ࡣ㸪య✚ຊἲ࡜Ỉᅽἲ࡟࠾࠸࡚㸪㣬࿴ࡋࡓ↓㝈ᩳ㠃࡟స⏝ࡍࡿ୙㣬࿴ᅵ୰ࡢ㛫㝽Ỉ㒊ศ࡟࠾ࡅࡿ༢఩య✚ᙜࡓࡾຊࢆࡑࢀࡒࢀ♧ࡋ࡚࠸ࡿ㸬ࡇࡇ࡛ࡣ㸪ഴࡁ β ࡛㸪ᆅࡢᾐ㏱ຊࡣ㸪㣬࿴ᅵ࡜ྠࡌ࡜⪃࠼ࡽࢀࡿ㸬య✚ V ࡢୗỈ఩ࡀᆅ⾲㠃࡟୍⮴ࡍࡿࡼ࠺࡞ᐃᖖᾐ㏱ὶࡀ࠶ࡿ

㣬࿴ࡋࡓࡍ࡭ࡾᅵሢ࡟స⏝ࡍࡿᾐ㏱ຊ J ࡣ㸪༢఩యሙྜࢆ⪃࠼㸪ᗏ㠃ࡢ㛗ࡉ l ࡀ༢఩㛗ࡉ 1 ࡛࠶ࡿࡼ࠺

✚ᙜࡓࡾࡢᾐ㏱ຊ j ࡟స⏝ࡍࡿࡍ࡭ࡾᅵሢࡢయ✚ V࡞ࢫࣛ࢖ࢫ࡟ാ࠸࡚࠸ࡿຊࡢࡘࡾྜ࠸ᘧࢆ᳨ウࡍࡿ㸬ࢆ஌ࡌ࡚ィ⟬ࡉࢀࡿ㸬ࡋ࠿ࡋ㸪୙㣬࿴ᅵࡢሙྜࡣࡍࡣࡌࡵ࡟㸪య✚ຊἲ࡛⾲ࡉࢀࡿ↓㝈ᩳ㠃ἲ࡟ࡘ࠸࡭ࡾᅵሢ୰࡟✵Ẽࡀྵࡲࢀࡿࡓࡵ㸪ᾐ㏱ຊࡀస⏝ࡍ

࡚㏙࡭ࡿ㸬ᅗ-1(a)࡟♧ࡍࡼ࠺࡟㸪㣬࿴ࡋࡓ↓㝈ᩳ㠃ࡿయ✚ࢆᙳ㡪య✚ Vj ࡜ࡋ㣬࿴ᗘ࡟౫Ꮡࡍࡿ࡜௬ᐃࡋ

࡟࠾࠸࡚ࡣ㸪ᩳ㠃࡟ᑐࡋ࡚ᖹ⾜࡞᪉ྥ࡟ᾐ㏱ຊ J㸪

࡚࠸ࡿ 6 㸬ࡇࡢ࡜ࡁ㸪య✚ V ࡢ୙㣬࿴ᅵ࡟స⏝ࡍࡿ㖄┤ୖྥࡁ࡟ᾋຊ Pv ࡀస⏝ࡍࡿ࡜⪃࠼ࡽࢀࡿ㸬ᾐ㏱

ᾐ㏱ຊ Junsat ࡣ㸪ḟᘧ࡛⾲ࡉࢀࡿ㸬ຊ J ࡣࡍ࡭ࡾ㠃࡜Ỉ㠃࡟┤ゅ࡞➼࣏ࢸࣥࢩࣕࣝ⥺㛫ࡢỈ㢌ᕪࡼࡾᑟฟ࡛ࡁ㸪ࡍ࡭ࡾᅵሢࡢయ✚ V ࡟స⏝ࡍࡿయ✚ຊἲ࡜ࡋ࡚ḟᘧ࡛⾲ࡉࢀࡿ㸬Uw  g  i VJU w  g  i  cos E  l  hw

U w  g  sin E  cos E 1  hwj V jU w  g  i  Sr  V(7)ࡇࡇ࡟㸪Junsat㸸య✚ V ࡢ୙㣬࿴ᅵ࡟స⏝ࡍࡿᾐ㏱ຊ㸪j㸸༢఩య✚ᙜࡓࡾࡢᾐ㏱ຊ㸪Sr㸸㣬࿴ᗘ㸬

(1)ࡇࡇ࡟㸪ρw㸸Ỉࡢᐦᗘ㸪g㸸㔜ຊຍ㏿ᗘ㸪iືỈ໙㓄㸪β㸸ᩳ㠃ࡢഴᩳゅ㸪hw㸸ᆅୗỈ఩㸬ᾋຊ Pv ࡣ㸪ḟᘧ࡟♧ࡍࡼ࠺࡟㸪ᆅୗỈ఩௨ୗ࡟࠶ࡿࡍ࡭ࡾᅵሢ࡟స⏝ࡍࡿᅽຊỈ㢌ᕪ࡟ࡼࡗ࡚ᑟฟࡍ

ᅗ-2 ࡣ㸪୙㣬࿴ᇦࡢࡍ࡭ࡾᅵሢࡢ࿘㠃࡟స⏝ࡍࡿ㛫㝽Ỉᅽࢆ♧ࡍ㸬୙㣬࿴ᇦࡢࡍ࡭ࡾᅵሢ࡟స⏝ࡍࡿ㛫㝽Ỉᅽࡣ㸪ᆅୗỈ఩࠿ࡽࡢ㧗ࡉ࡟ᛂࡌ࡚㈇ࡢ㛫㝽Ỉᅽࡀ┤⥺ⓗ࡟ኚ໬ࡍࡿࡶࡢ㸦ᖹ⾮≧ែ㸧࡜௬ᐃࡋࡓ㸬ࡲࡓ㸪ࡍ࡭ࡾᅵሢࢆᅽ⦰ࡍࡿ᪉ྥࢆṇ࡜ࡋ࡚࠸ࡿ㸬୙㣬࿴ᇦ࡟࠾࠸࡚ࡶ㸪ࡍ࡭ࡾᅵሢࡢୖ㠃࠾ࡼࡧୗ㠃࡟㈇ࡢ㛫㝽ỈᅽࡀⓎ⏕ࡋ࡚࠸ࡿ㸬ࡑࡢࡓࡵ㸪ᅽࡿࡇ࡜ࡀ࡛ࡁࡿ㸬Uw  g VPvJ unsat

U w  g  cos E  l  hw

U w  g  cos E 1  hwຊỈ㢌ᕪ࡟ࡼࡿయ✚ຊࡀ୙㣬࿴≧ែࡢࡍ࡭ࡾᅵሢ࡟
(2)ຊࡢࡘࡾྜ࠸ᘧࡼࡾ㸪య✚ຊἲ࡟࠾ࡅࡿᏳ඲⋡ Fb ࡀᘧ(3)࡛⾲ࡉࢀࡿ㸬Fbc  W  Pv cos E tan IJ  (W  Pv )sin E(3)ࡇࡇ࡟㸪c㸸ぢ࠿ࡅࡢ⢓╔ᡂศ㸪W㸸ࢫࣛ࢖ࢫ⮬㔜㸪ȭ㸸ෆ㒊ᦶ᧿ゅ㸬ḟ࡟㸪Ỉᅽἲ࡟ࡼࡿ↓㝈ᩳ㠃ἲ࡟ࡘ࠸࡚⪃࠼ࡿ㸬ᅗ-1(b)࡟♧ࡍࡼ࠺࡟㸪㣬࿴ࡋࡓ↓㝈ᩳ㠃࡟࠾࠸࡚ࡣ㸪㸦a㸧 య✚ຊἲ(b) Ỉᅽἲ

ᅗ-1 ↓㝈ᩳ㠃࡟స⏝ࡍࡿຊ 8)ࡍ࡭ࡾᅵሢഃ㠃࡟ാࡃỈᅽࡢྜຊ E1㸪E2 ࡜㸪ࡍ࡭ࡾᅵሢୗ㠃࡟ാࡃỈᅽࡢྜຊ U ࡀస⏝ࡍࡿ࡜⪃࠼ࡿ㸬

E1

E2U w  g 1 cos 2 E  hw2 1U w  g 1 cos E  hw 12U(4)(5)ຊࡢࡘࡾྜ࠸ࡼࡾ㸪Ỉᅽἲ࡟࠾ࡅࡿᏳ඲⋡ Fw ࡀ 
ᘧ(6)࡛⾲ࡉࢀࡿ㸬
Fwc  W cos E  U tan IW sin E(6)࡞࠾㸪ᘧ(3)㸪ᘧ(6)ࢆ⏝࠸ࡓᩳ㠃Ᏻᐃゎᯒ࡟࠾࠸࡚㸪ࡍ࡭ࡾᅵሢෆ࡟ᆅୗỈ఩ࡀ࠶ࡿሙྜ㸪ᆅୗỈ఩ࡼࡾ― 38 ―

ᅗ-2 ࡍ࡭ࡾᅵሢࡢ࿘㎶࡟స⏝ࡍࡿ㛫㝽Ỉᅽస⏝ࡍࡿ࡜⪃࠼ࡽࢀࡿ㸬ࡇࢀࡣ㸪ᘧ(2)࡟♧ࡍ㣬࿴≧࡞࠾㸪ࡍ࡭ࡾᅵሢ඲యࡀ㣬࿴ࡋࡓሙྜࡢᘧ(13)㸪ᘧែ࡛࠶ࡿࡍ࡭ࡾᅵሢ࡟స⏝ࡍࡿᾋຊ࡜≀⌮ⓗస⏝ࡣ(14)ࡣ㸪ᘧ(3)࠾ࡼࡧᘧ(6)࡜ྠࡌ࡟࡞ࡿ㸬ྠࡌࡶࡢ࡛࠶ࡿ㸬୙㣬࿴ᇦ࡟࠾ࡅࡿࡍ࡭ࡾᅵሢ࡟ാ

ᚑ᮶ࡢᆅୗỈ఩௨ୗࡢ Jsat㸪Pv,sat㸪Usat ࡟ࡘ࠸࡚ࡣ㸪ࡃᅽຊỈ㢌ᕪ࡟ࡼࡿయ✚ຊ Pv,unsat ࡣ㸪ࡍ࡭ࡾᅵሢࡢ

ᅗ-3 ࡟♧ࡍࡼ࠺࡞ຊࡢ୕ゅᙧࡀ㛢ࡌࡿࡇ࡜࡛㸪య✚ୖ㠃࠾ࡼࡧୗ㠃࡟స⏝ࡍࡿ㛫㝽Ỉᅽࡢྜຊ Uunsat ࡜ຊἲ࡜ỈᅽἲࡢຊᏛⓗຠᯝࡀ➼ࡋࡃ࡞ࡾ㸪Ᏻ඲⋡ࡀḟᘧࡢࡼ࠺࡞㛵ಀ࡟࠶ࡿ㸬୍⮴ࡍࡿࡇ࡜ࡀ☜ㄆࡉࢀ࡚࠸ࡿ 8)㸬ࡋ࠿ࡋ㸪ᘧ(13)࡟

Pv ,unsat

U unsatcos E࠾ࡅࡿయ✚ຊἲ㸦୙㣬࿴ᅵ୰ࡢᾐ㏱ຊ࡜ᅽຊỈ㢌ᕪ
(8)ࡇࡇ࡟㸪Pv,unsat㸸୙㣬࿴ᇦ࡟࠾ࡅࡿࡍ࡭ࡾᅵሢ࡟ാࡃ࡟ࡼࡿయ✚ຊࢆ⪃៖㸧࡜ᘧ(14)࡟࠾ࡅࡿỈᅽἲ㸦୙㣬࿴ᅵ୰ࡢ㈇ࡢ㛫㝽Ỉᅽࢆ⪃៖㸧࠿ࡽ⟬ฟࡉࢀࡿᏳ඲⋡ࡀ୍⮴ࡋ࡞࠸࡜࠸࠺ㄢ㢟ࡀ⏕ࡌࡓ 7)㸬ࡑࡢཎᅉࡢᅽຊỈ㢌ᕪ࡟ࡼࡿయ✚ຊ㸪Uunsat㸸ࡍ࡭ࡾᅵሢࡢୖ㠃୍ࡘ࡜ࡋ࡚㸪ᘧ(12)࡟♧ࡉࢀࡿᙳ㡪㠃✚ࡢỴᐃ᪉ἲ࠾ࡼࡧୗ㠃࡟స⏝ࡍࡿ㛫㝽Ỉᅽࡢྜຊ㸬ࡀ⪃࠼ࡽࢀࡿ㸬ᙳ㡪㠃✚ࡢỴᐃࡍࡿಀᩘ࡛࠶ࡿ α ࡣ㸪ᅗ-2 ࡟♧ࡉࢀࡿࡍ࡭ࡾᅵሢࡢഃ㠃࡟ാࡃỈᅽࡢྜຊ E1㸪E2 ࡣ㸪㣬࿴ᇦ㸦ᅗ-1(b)㸧࡜ྠᵝ࡟┦ẅࡉࢀࡿ㣬࿴ᗘ࡟౫Ꮡࡍࡿಀᩘ࡜ᛮࢃࢀࡿࡀ࡝ࡢࡼ࠺࡞್࡛
࠶ࡿ࠿ࡣᮍゎ࡛᫂࠶ࡿ㸬ࡑࡇ࡛㸪ᮏㄽᩥ࡛ࡣ㸪ὠᒣࡇ࡜ࡀࢃ࠿ࡿ㸬ࡲࡓ㸪ᩳ㠃Ᏻᐃゎᯒ࡟ᙳ㡪ࡍࡿࡍ࡭ࡽ 7)ࡀᥦ᱌ࡍࡿᘧ(15)࡟♧ࡍࡼ࠺࡞㸪య✚࡜㠃✚ࡢẚࡾᅵሢࡢୖ㠃࠾ࡼࡧୗ㠃࡟స⏝ࡍࡿ㛫㝽Ỉᅽࡢྜຊ⋡࡟╔┠ࡋࡓ 2 ஌ 3 ஌ἲ๎࡟ࡼࡿᘧࢆ⏝࠸ࡓ㸬

Uunsat ࡣḟᘧ࡛⾲ࡉࢀࡿ㸬

Uunsat1  Uunsat 2

UunsatD(9)ࡇࡇ࡟㸪Uunsat1㸸ࡍ࡭ࡾᅵሢୗ㠃࡟స⏝ࡍࡿ㛫㝽Ỉᅽ㸪
Uunsat2㸸ࡍ࡭ࡾᅵሢୖ㠃࡟స⏝ࡍࡿ㛫㝽Ỉᅽ㸬3

Sr2(15)ࡇࡢ α ࡣ㸪㣬࿴ᗘࡢᣢࡘయ✚ࡢẚ⋡ࢆᙳ㡪㠃✚ࡢᣢỈᅽࡢྜຊࡣ㸪Ỉᅽ࡜Ỉᅽࡀస⏝ࡍࡿ㠃✚ࢆ஌ࡌࡘ㠃✚ࡢẚ⋡࡟ኚ᥮ࡋࡓࡶࡢ࡛࠶ࡾ㸪α ࢆ㣬࿴ᗘ࡜ࡿ࡜ᚓࡽࢀࡿࡓࡵ㸪ࡍ࡭ࡾᅵሢࡢୗ㠃࡜ୖ㠃࡟స⏝ࡍࡿሙྜࡼࡾࡶయ✚ຊἲ࡜ỈᅽἲࡢᏳ඲⋡ࡢᕪࡀᑠࡍࡿྜຊ Uunsat1 㸪Uunsat2 ࡣࡑࢀࡒࢀḟᘧࡢࡼ࠺࡟⾲ࡉࡃ࡞ࡿࡇ࡜ࡀሗ࿌ࡉࢀ࡚࠸ࡿ 7)㸬ࡋ࠿ࡋ㸪୙㣬࿴ࡉࢀࡿ㸬

Uunsat1

uunsat1 u Aw1(10)

Uunsat 2

uunsat 2 u Aw2(11)

ᾐ㏱ࢆ⪃៖ࡋࡓయ✚ຊἲ࡜Ỉᅽἲࡢィ⟬⤖ᯝࡀ୍⮴ࡋ࡚࠸࡞࠸ࡓࡵ㸪ಀᩘ α ࡟ࡘ࠸࡚ࡉࡽ࡞ࡿᨵⰋࡀᚲせࡔ࡜⪃࠼ࡿ㸬ᮏㄽᩥ࡛ࡣ㸪α ࡢᨵⰋࢆ᳨ウࡍࡿ๓࡟㸪୙㣬࿴ᇦࡇࡇ࡟㸪uunsat1㸸ࡍ࡭ࡾᅵሢୗ㠃࡟స⏝ࡍࡿ㛫㝽Ỉᅽ㸪

ࡢᾐ㏱ຊࡢィ⟬᪉ἲࡢ⢭ᗘ࡟ࡘ࠸࡚෌᳨ウࡍࡿ㸬≉uunsat2㸸ࡍ࡭ࡾᅵሢୖ㠃࡟స⏝ࡍࡿ㛫㝽Ỉᅽ㸪Aw1㸸ࡍ࡟㸪୙㣬࿴ᇦࡢᾐ㏱ຊࢆィ⟬ࡍࡿ㝿ࡢศ๭ᩘ࡟╔┠࡭ࡾᅵሢୗ㠃࡛㛫㝽Ỉᅽࡀస⏝ࡍࡿ㠃✚㸪Aw2㸸ࡍ࡭ࡋ᳨࡚ウࡍࡿ㸬ࡾᅵሢୖ㠃࡛㛫㝽Ỉᅽࡀస⏝ࡍࡿ㠃✚㸬୙㣬࿴ᅵࡢሙྜࡣỈᅽࡀస⏝ࡍࡿ㠃✚࡟✵Ẽࡢ㒊ศࡶྵࡲࢀࡓࡵ㸪୙㣬࿴ᇦ࡟࠾࠸࡚㛫㝽Ỉᅽࡀస⏝ࡍࡿ㠃✚ࢆᙳ㡪㠃✚ Aw ࡜ࡋ࡚࠸ࡿ㸬ᙳ㡪㠃✚ Aw ࡜ࡍ࡭ࡾᅵሢࡢୖ㠃࠾ࡼࡧୗ㠃ࡢ᩿㠃✚ A ࡢ㛵ಀࡀḟᘧࡢࡼ࠺࡟⾲ࡉࢀࡿࡶࡢ࡜௬ᐃࡍࡿ㸬

AwDuA(12)ࡇࡇ࡟㸪α㸸㣬࿴ᗘ࡟౫Ꮡࡍࡿಀᩘ㸬
ᘧ(7)㸪ᘧ(8)㸪ᘧ(9)ࢆ⏝࠸ࡿࡇ࡜࡛㸪୙㣬࿴ᾐ㏱ࢆ
⪃៖ࡋࡓయ✚ຊἲ࠾ࡼࡧỈᅽἲ࡟ࡼࡿ↓㝈ᩳ㠃ἲࡢᏳᐃゎᯒࡀྍ⬟࡜࡞ࡿ㸬య✚ຊἲ࡟ࡼࡿᏳ඲⋡ Fb ࡀᘧ(13)㸪Ỉᅽἲ࡟ࡼࡿᏳ඲⋡ Fw ࡀᘧ(14)࡟♧ࡉࢀࡿ㸬
FbFwc  W  Pv ,unsat cos E tan I
J unsat  W  Pv ,unsat sin Ec  W cos E  U unsat tan I
W sin E

(13)

(14)

ᅗ-3 㣬࿴᫬ࡢᾐ㏱ຊ㸪ᅽຊỈ㢌ᕪ࡟ࡼࡿయ✚ຊ㸪㛫㝽Ỉᅽࡢྜຊࡢຊࡢከゅᙧ― 39 ―

1.0m㸪㖄┤ୖྥࡁ࡟+1.0m ࡜㧗ࡉࢆỴᐃࡋࡓ㸬ᮏゎ㸬୙㣬࿴ᇦࡢᾐ㏱ຊࡢศ๭ᩘ࡟㛵ࡍࡿ᳨ウᯒࡢᆅୗỈ఩ࡣ㸪ᅗ-7 ࡟♧ࡍࡼ࠺࡟ᩳ㠃ࡢഴᩳゅ࡜ྠࡌゅᗘ࡛Ꮡᅾࡋ㸪㧗ࡉ-1.0m ࡟ᅛᐃࡋ࡚ィ⟬ࢆ⾜ᅗ-4 ࡣ㸪୙㣬࿴ᇦ࡟స⏝ࡍࡿᾐ㏱ຊࢆ♧ࡋ࡚࠸ࡿ㸬ࡗࡓ㸬ヨᩱ᮲௳ࡣ㸪ᕝෆࡋࡽࡍࢆ⏝࠸ࡓ㸬ᘧ(7)࡟♧ࡍࡼ࠺࡟㸪୙㣬࿴ᇦࡢᾐ㏱ຊࡣ㣬࿴ᗘ࡟ᛂࡲࡓ㸪ぢ࠿ࡅࡢ⢓╔ᡂศࡣ㸪㣬࿴ᗘ࡟ࡼࡗ࡚ኚ໬ࡌ࡚኱ࡁࡉࡀỴᐃࡉࢀ㸪ᆅୗỈ఩࠿ࡽࡍ࡭ࡾᅵሢୖ
㠃࡟㏆࡙ࡃ࡜㸪㣬࿴ᗘࡀᑠࡉࡃ࡞ࡿࡓࡵᾐ㏱ຊࡶᑠ
ࡉࡃ࡞ࡿࡇ࡜ࡀ⪃࠼ࡽࢀࡿ㸬ࡑࡇ࡛㸪Ᏻᐃゎᯒࡢィ⟬࡛ࡣ㸪୙㣬࿴ᇦ࡟࠶ࡿࡍ࡭ࡾᅵሢࢆ㧗ࡉ᪉ྥ࡟➼㛫㝸࡛ n ศ๭ࡍࡿ࡜㸪ḟᘧࡢࡼ࠺࡟ồࡵࡽࢀࡿ㸬J unsat

1 n¦ Uw  g  i  Sr ,k Vknk 1

U w  g  i  Sr  V(16)ࡇࡇ࡟㸪n㸸ศ๭ᩘ㸪Vk㸸ศ๭ࡉࢀࡓᅵࡢయ✚㸪Sr,k㸸
ᅗ-4 ୙㣬࿴ᇦ࡟స⏝ࡍࡿᾐ㏱ຊ

ศ๭ࡉࢀࡓᅵࡢ㣬࿴ᗘ㸬
ᅗ-5 ࡣ㸪୍౛࡜ࡋ࡚㸪ࡍ࡭ࡾᅵሢࢆ 10 ศ๭ࡋࡓ㝿ࡢ㟼Ỉᅽศᕸ࡜㣬࿴ᗘศᕸࢆ♧ࡋ࡚࠸ࡿ㸦㣬࿴ᗘࡢ್ࡣ㸪h=1.0m㸪β=40rࡢሙྜ㸧㸬ᅗ-5 ࡟♧ࡍ㟼Ỉᅽศᕸࡣ㸪ᆅୗỈ఩࠿ࡽࡢ㧗ࡉ࡟ᛂࡌ࡚㈇ࡢ㛫㝽Ỉᅽࡀ┤⥺ⓗ࡟ኚ໬ࡍࡿࡶࡢ㸦ᖹ⾮≧ែ㸧࡜ࡋ࡚࠸ࡿ㸬ᅗ-6 ࡣ㸪㛫㝽ࣔࢹࣝ 9)࡛᥎ᐃࡉࢀࡓỈศ≉ᛶ᭤⥺ࢆ♧ࡋ࡚࠸ࡿ㸬㛫㝽ࣔࢹࣝ࡜ࡣ㸪☜⋡⤫ィㄽࢆ᥼⏝ࡋࡓࣔࢹ࡛ࣝ㸪⢏ᚄຍ✚᭤⥺࠾ࡼࡧ㛫㝽ẚࡢᐇ್࠿ࡽ㸪㛫㝽ᚄศᕸࢆ᥎ᐃࡋ㸪㣬࿴ᗘ㸪Ỉศ≉ᛶ᭤⥺㸪୙㣬࿴࣭㣬࿴㏱Ỉಀᩘࢆ⟬ᐃࡍࡿࣔࢹ࡛ࣝ࠶ࡿ㸬ᅗ-5 ࡍ࡭ࡾᅵሢ୰ࡢ㣬࿴ᗘタᐃࡢ୍౛௒ᅇࡢゎᯒ࡛ࡣ㸪ศ๭ࡉࢀࡓࢫࣛ࢖ࢫࡈ࡜࡟㟼Ỉᅽศᕸ࠿ࡽ㈇ࡢ㛫㝽Ỉᅽࢆ⟬ฟࡋ㸪ࡑࡢ್ࢆᅗ-6 ࡟♧ࡍỈศ≉ᛶ᭤⥺࡟௦ධࡍࡿࡇ࡜࡛㣬࿴ᗘࢆỴᐃࡋࡓ㸬ࡉࡽ࡟㸪ࡑࡢ㣬࿴ᗘࢆᘧ(7)࡟௦ධࡍࡿࡇ࡜࡛ྛ
ࢫࣛ࢖ࢫࡈ࡜ࡢᾐ㏱ຊࢆỴᐃࡍࡿࡇ࡜ࡀ࡛ࡁ㸪ࡑࢀࡽࡢྜຊࡀ୙㣬࿴ᇦࡢᾐ㏱ຊ࡜࡞ࡿ㸬ࡲࡓ㸪ᘧ(16)ࡢ
ࡼ࠺࡟㸪ᖹᆒ㣬࿴ᗘ Sr ࢆᘧ(7)࡟௦ධࡍࡿ᪉ἲ࡛ࡶ୙
㣬࿴ᇦࡢᾐ㏱ຊࢆồࡵࡿࡇ࡜ࡀ࡛ࡁࡿ㸬ࡋ࠿ࡋ㸪ࡇ
ࢀࡽࡢᾐ㏱ຊࡢ⟬ฟ᪉ἲ࡛ࡣ㸪ᾐ㏱ຊࡀࡍ࡭ࡾᅵሢ
ࡢศ๭ᩘࡢタᐃ࡟ࡼࡗ࡚ኚ໬ࡍࡿ࡜⪃࠼ࡽࢀࡿ㸬᪤ ࡢ◊✲ 7)࡛ࡣ㸪୙㣬࿴ᇦࡢࡍ࡭ࡾᅵሢࢆ 10 ศ๭㸦10cm 㛫㝸㸧࡟タᐃࡋ࡚࠸ࡿࡀ㸪ศ๭ᩘࢆࡼࡾ⣽࠿ࡃタᐃࡍࡿࡇ࡜࡛㸪ᾐ㏱ຊࡀ࠶ࡿ್࡟཰᮰ࡍࡿ࡜⪃ᅗ-6 㛫㝽ࣔࢹ࡛ࣝ᥎ᐃࡉࢀࡓỈศ≉ᛶ᭤⥺࠼ࡽࢀࡿ㸬ࡑࡇ࡛㸪ᮏㄽᩥ࡛ࡣ㸪୙㣬࿴ᇦࡢᾐ㏱ຊ
ࡢ್ࡀ཰᮰ࡍࡿ㐺ษ࡞ศ๭ᩘ࡟ࡘ࠸᳨࡚ウࡋࡓ㸬ࡉࡽ࡟㸪ศ๭ᩘࡢ㐪࠸ࡀᩳ㠃Ᏻᐃゎᯒࡢ⤖ᯝ࡟୚࠼ࡿ
ᙳ㡪࡟ࡘ࠸࡚ࡶ⪃ᐹࢆ⾜࠺㸬(1) ゎᯒ᮲௳
ᅗ-7 ࡣ㸪ᮏ◊✲ࡢ඲࡚ࡢゎᯒ࡛⏝࠸ࡓᩳ㠃ᙧ≧࡜ヨᩱ᮲௳ࢆ♧ࡋ࡚࠸ࡿ㸬ᩳ㠃ᙧ≧ࡣ㸪ࡍ࡭ࡾ㠃㸦ࡍ࡭ࡾᅵሢୗ㠃㸧ࡢ఩⨨ࢆ 0m ࡜ࡋ࡚㖄┤ୗྥࡁ࡟-― 40 ―

ᅗ-7 ᩳ㠃ᙧ≧࡜ヨᩱ᮲௳ࡍࡿࡀ㸪ᮏㄽᩥ࡛ࡣ㸪୙㣬࿴ᇦࡢᾐ㏱ຊࡢỴᐃ᪉ἲ࡜ᩳ㠃Ᏻᐃゎᯒࡢ⤖ᯝ࡬ࡢᙳ㡪ࢆ㆟ㄽࡍࡿࡓࡵ㸪ぢ࠿ࡅࡢ⢓╔ᡂศࢆ୍ᐃ࡜ࡋ࡚ィ⟬ࢆ⾜ࡗࡓ㸬ぢ࠿ࡅࡢ⢓╔ᡂศࡢ㣬࿴ᗘኚ໬࡟࠾ࡅࡿᩳ㠃Ᏻᐃゎᯒ࡬ࡢᙳ㡪࡟㛵ࡋ࡚ࡣ㸪ཧ⪃ㄽᩥ 10)ࢆཧ↷࠸ࡓࡔࡁࡓ࠸㸬୙㣬࿴ᇦ࡟࠶ࡿࡍ࡭ࡾᅵሢࡢ㔜㔞ࡣ㸪ᖹᆒ㣬࿴ᗘ

Sr ࢆ⟬ฟࡍࡿࡇ࡜࡛Ỵᐃ࡛ࡁࡿ㸬ࡇࡇ࡛ࡢᖹᆒ㣬࿴ᗘ Sr ࡣ㸪୙㣬࿴ᇦࡢᾐ㏱ຊࡢ⟬ฟࡉࢀࡓࡶࡢ࡜ྠࡌ್࡛࠶ࡿ㸬(2) ୙㣬࿴ᇦࡢᾐ㏱ຊ࡟୚࠼ࡿศ๭ᩘࡢᙳ㡪ᮏ⠇࡛ࡣ㸪ศ๭ᩘࢆ 10 ศ๭㸦10cm 㛫㝸㸧࠿ࡽ 500

ᅗ-8 ศ๭ᩘኚື᫬ࡢ୙㣬࿴ᇦࡢᾐ㏱ຊ

ศ๭㸦0.2cm 㛫㝸㸧ࡲ࡛㸪10 ศ๭ࡈ࡜࡟⟬ฟࡋ㸦ィ
50 ࢣ࣮ࢫ㸧㸪୙㣬࿴ᇦࡢᾐ㏱ຊࡢ್ࡢኚ໬ࢆ☜ㄆࡍࡿ㸬ࡉࡽ࡟㸪ᾐ㏱ຊࡢ್ࡀ μ㸦ᖹᆒ್㸧±σ㸦ᶆ‽೫ᕪ㸧ࡢ⠊ᅖෆ࡟཰ࡲࡿ㝿㸪ࡑࡢ᫬ࡢศ๭ᩘࡣ୙㣬࿴
ᇦࡢᾐ㏱ຊࢆ༑ศ࡟ホ౯࡛ࡁࡿ࡜௬ᐃࡋ᳨࡚ウࡍࡿ㸬࡞࠾㸪50 ࢣ࣮ࢫࡢศ๭ᩘ࡛ᚓࡽࢀࡓᾐ㏱ຊࢆ⏝࠸࡚ᖹᆒ್࡜ᶆ‽೫ᕪࢆ⟬ฟࡋ࡚࠸ࡿ㸬
ᅗ-8 ࡣ㸪ศ๭ᩘኚື᫬ࡢ୙㣬࿴ᇦࡢᾐ㏱ຊࡢ್ࢆ
♧ࡋ࡚࠸ࡿ㸬ᐇ⥺ࡀ୙㣬࿴ᇦࡢᾐ㏱ຊ㸪Ⅼ⥺ࡣࡑࡢμ㸪◚⥺ࡣ μ±σ ࡢ⠊ᅖࢆ♧ࡋ࡚࠸ࡿ㸬୙㣬࿴ᇦࡢᾐ㏱
ຊࡢ್ࡣ㸪ศ๭ᩘࡀ 50 ศ๭㸦2cm 㛫㝸㸧ࡲ࡛ࡢ⠊ᅖࡲ࡛ྑ⫪ୖࡀࡾ࡛ୖ᪼ࡋ࡚࠾ࡾ㸪ࡑࡇ࠿ࡽ࠾࠾ࡼࡑ

ᅗ-9 ศ๭ᩘኚື᫬ࡢయ✚ຊἲ࡟࠾ࡅࡿᏳ඲⋡200 ศ๭㸦0.5cm 㛫㝸㸧ࡲ࡛ᑡࡋࡎࡘ್ࡀቑຍࡋ࡚࠸
ࡿ㸬200 ศ๭㸦0.5cm 㛫㝸㸧࠿ࡽ㸪࠾࠾ࡼࡑ 500 ศ๭
㸦0.2cm 㛫㝸㸧ࡲ࡛ࡢ⠊ᅖ࡛ࡣ୙㣬࿴ᇦࡢᾐ㏱ຊࡢ್ࡀ୍ᐃ್࡟཰᮰ࡋ࡚࠸ࡿ㸬ࡲࡓ㸪50 ศ๭㸦2cm 㛫㝸㸧௨㝆ࡢ୙㣬࿴ᇦࡢᾐ㏱
ຊࡢ್ࡣ㸪μsσ ࡢ⠊ᅖ࡟཰ࡲࡿࡇ࡜࠿ࡽ㸪ศ๭ᩘࡀ50 ศ๭㸦2cm 㛫㝸㸧௨ୖ࡛ࡣ㸪ᾐ㏱ຊࢆ༑ศ࡟ホ౯࡛ࡁࡿྍ⬟ᛶࡀ♧၀ࡉࢀࡓ㸬(3) ศ๭ᩘࡢ㐪࠸ࡀᩳ㠃Ᏻᐃゎᯒ࡟୚࠼ࡿᙳ㡪ᅗ-9 ࡣ㸪ศ๭ᩘኚື᫬ࡢయ✚ຊἲ࡟࠾ࡅࡿᏳ඲⋡㸪
ᅗ-10 ࡣ㸪ศ๭ᩘኚື᫬ࡢỈᅽἲ࡟࠾ࡅࡿᏳ඲⋡ࢆ

ᅗ-10 ศ๭ᩘኚື᫬ࡢ࡟࠾ࡅࡿỈᅽἲࡢᏳ඲⋡♧ࡋ࡚࠸ࡿ㸬ᐇ⥺ࡀయ✚ຊἲ࡜ỈᅽἲࡢᏳ඲⋡㸪Ⅼ⥺ࡣࡑࡢ μ㸪◚⥺ࡣ μ±σ ࡢ⠊ᅖࢆ♧ࡋ࡚࠸ࡿ㸬ᅗ-9
࡜ᅗ-10 ࡼࡾ㸪10 ศ๭㸦10cm 㛫㝸㸧࡟࠾ࡅࡿయ✚ຊἲ࡜ỈᅽἲࡢᏳ඲⋡ࡣ㸪Ᏻ඲⋡ࡢᖹᆒ್±σ ࡢ⠊ᅖࡼࡾࡶ኱ࡁ࠸ࡇ࡜ࡀࢃ࠿ࡿ㸬୍᪉࡛㸪50 ศ๭㸦2cm 㛫㝸㸧௨ୖࡢయ✚ຊἲ࡜ỈᅽἲࡢᏳ඲⋡ࡣ㸪Ᏻ඲⋡ࡢᖹᆒ್࠿ࡽ±σ ࡢ⠊ᅖ࡟཰ࡲࡿࡇ࡜ࡀ☜ㄆ࡛ࡁࡓ㸬
ᅗ-11 ࡣ㸪ศ๭ᩘኚື᫬࡟࠾ࡅࡿỈᅽἲࡢᏳ඲⋡Fw ࡜య✚ຊἲࡢᏳ඲⋡ Fb ࡢᕪ㸦Fw-Fb㸧ࢆ♧ࡋ࡚࠸ࡿ㸬ᐇ⥺ࡀయ✚ຊἲ࡜ỈᅽἲࡢᏳ඲⋡ࡢᕪ㸪Ⅼ⥺ࡣࡑࡢ μ㸪◚⥺ࡣ μ±σ ࡢ⠊ᅖࢆ♧ࡋ࡚࠸ࡿ㸬ᅗ-11 ศ๭ᩘኚື᫬࡟࠾ࡅࡿᏳ඲⋡ࡢᕪ― 41 ―ࡵ࡟㸪ᙳ㡪㠃✚ࢆỴᐃࡍࡿಀᩘ α ࡢỴᐃ᪉ἲ࡟

ᅗ-11 ࡟♧ࡍࡼ࠺࡟㸪య✚ຊἲ࡜ỈᅽἲࡢᏳ඲⋡ࡘ࠸࡚ࡶ᳨ウࡍࡿ㸬ࡢᕪ㸦Fw-Fb㸧ࡣ㸪ศ๭ᩘࡀ 50 ศ๭㸦2cm 㛫㝸㸧௨ୖ࡛ᖹᆒ್࠿ࡽ±σ ࡢ⠊ᅖ࡟཰ࡲࡿࡇ࡜ࡀ☜ㄆ࡛ࡁࡿ㸬ࡲࡓ㸪ศ๭ᩘࢆቑࡸࡋ࡚࠸ࡃ࡜Ᏻ඲⋡ࡢᕪࡀ୍ཧ⪃ᩥ⊩ᐃࡢ್࡟཰᮰ࡍࡿࡓࡵ㸪య✚ຊἲ࡜ỈᅽἲࡢᏳ඲⋡1) Duncan, J. M.: State of the art: Limit equilibrium andࡀ୍⮴ࡋ࡞࠸࡜࠸࠺ㄢ㢟࡟ࡣศ๭ᩘࡀᙳ㡪ࡋ࡞࠸ࡇ

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㝸㸧௨ୖ࡟タᐃࡍࡿ࡛㸪య✚ຊἲ࡜ỈᅽἲࡢᏳ඲⋡2) Kitamura, R., Sako, K.: Contribution of “Soils andࡢ್ࡣ㐺ษ࡟ホ౯࡛ࡁࡿྍ⬟ᛶࡀ࠶ࡿ㸬ࡋ࠿ࡋ㸪௒foundation” to studies on rainfall-induced slopeᅇࡢゎᯒ࡛ࡣ㸪ᆅୗỈ఩ࡢ㧗ࡉ-1.0m ࡢࡳࡢ᳨ウ࡛

failure, Soils and Foundations, Vol.50, No.6, pp.955-࠶ࡿࡓࡵ㸪␗࡞ࡿᆅୗỈ఩ࡢ㧗ࡉ࡟࠾ࡅࡿ᳨ウࡶ⾜964, 2010.

࠺ᚲせࡀ࠶ࡿ㸬ࡉࡽ࡟㸪ᅵヨᩱࡢ㐪࠸࡟ࡼࡿᙳ㡪࡞3) Zhang, L.L., Fredlund, D.G., Zhang, L.M. and࡝ࢆ⪃ᐹࡍࡿࡇ࡜࡛㸪ᾐ㏱ຊࡸᏳ඲⋡ࡢ್ࢆ㐺ษ࡟

Tang,W.H.: Numerical study of soil conditions underホ౯࡛ࡁࡿศ๭ᩘࢆỴᐃࡋ࡚࠸ࡁࡓ࠸㸬

which matric suction can be maintained. Canadian㸬࠾ࢃࡾ࡟

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4) Collins, B.D. and Znidarcic, D.: Stability analyses ofᮏㄽᩥ࡛ࡣ㸪య✚ຊἲ࡜Ỉᅽἲࡢィ⟬⤖ᯝࡢ⢭ᗘrain-fall induced landslides, ASCE Journal ofྥୖࡢࡓࡵ㸪ᩳ㠃Ᏻᐃゎᯒ࡟࠾ࡅࡿ୙㣬࿴ᇦࡢᾐ㏱Geotechnicalຊࡢィ⟬᪉ἲ࡟ࡘ࠸࡚ぢ┤ࡋ㸪ศ๭ᩘࡢ㐪࠸࡟ࡼࡿ
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1)୙㣬࿴ᇦࡢᾐ㏱ຊࡢ್ࡣ㸪ศ๭ᩘ࡟ᛂࡌ࡚ࡑࡢ

6) Sako, K., Tabata, M., Kitamura, R., Niisaka, M.:್ࡀኚ໬ࡍࡿࡇ࡜ࡀࢃ࠿ࡗࡓ㸬ศ๭ᩘࡀᑡ࡞࠸

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seepage force in unsaturated slope, Proc. of the sixthࡉࡃ࡞ࡾᾐ㏱ຊࡢ್ࡀ㐣ᑠホ౯ࡉࢀࡿࡇ࡜ࡀ☜International Conference on Unsaturated Soilsㄆࡉࢀࡓ㸬ࡲࡓ㸪ᮏㄽᩥࡢ⠊ᅖ࡛ࡣ㸪ศ๭ᩘࡣ(UNSAT2014), pp.1279-1285, 2014.

ᑡ࡞ࡃ࡜ࡶ 50 ศ๭㸦2cm 㛫㝸㸧࠶ࢀࡤ୙㣬࿴ᇦ7) ὠᒣ㞞ᚨ㸪㓇ໝ୍ᡂ㸪ఀ⸨┿୍㸪໭ᮧⰋ௓㸸 ୙ࡢᾐ㏱ຊࡢ್ࡣ኱ࡁࡃኚ໬ࡋ࡞࠸ࡇ࡜ࡀศ࠿ࡗ㣬࿴ᅵ୰ࡢ㛫㝽Ỉᅽࡢᙳ㡪ࢆ⪃៖ࡋࡓ↓㝈ᩳ㠃ࡓ㸬ἲࡢᨵⰋ࡟㛵ࡍࡿ᳨ウ. ᅵᮌᏛ఍ㄽᩥ㞟 A2㸦ᛂ⏝ຊᏛ㸧
㸪Vol.75㸪No.2(ᛂ⏝ຊᏛㄽᩥ㞟 Vol.22)㸪

2) ୙㣬࿴ᾐ㏱ࢆ⪃៖ࡋࡓ↓㝈ᩳ㠃ἲ࡟࠾࠸࡚㸪ศ๭ᩘࢆኚືࡉࡏ࡞ࡀࡽᩳ㠃Ᏻᐃゎᯒࢆ⾜ࡗࡓ㸬ᮏㄽᩥࡢ⠊ᅖ࡛ࡣ㸪య✚ຊἲ࡜Ỉᅽἲࡢ࡝ࡕࡽ

I_371-I_378㸪2019.
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࡟࠾࠸࡚ࡶ㸪ศ๭ᩘࡀᑡ࡞࠸ሙྜࡣ⣽࠿ࡃタᐃࡋࡓሙྜ࡟ẚ࡭࡚㸪Ᏻ඲⋡ࡀ኱ࡁࡃ࡞ࡗࡓ㸬ࡲ9) Sako,K., Kitamura,R. : A practical numerical modelࡓ㸪Ᏻ඲⋡ࡢィ⟬࡟࠾࠸࡚ࡶ㸪ศ๭ᩘࡣᑡ࡞ࡃ

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⋡ࡢ್ࡀ཰᮰ࡍࡿࡇ࡜ࡀࢃ࠿ࡗࡓ㸬ࡉࡽ࡟㸪ศ10) Uto, R., Sako, K. and Kitamura, R.: A study on slope๭ᩘࡢ㐪࠸ࡣయ✚ຊἲ࡜ỈᅽἲࡢᏳ඲⋡ࡀ୍⮴

stability analysis considered seepage force, buoyanceࡋ࡞࠸࡜࠸࠺ㄢ㢟࡟ࡣᙳ㡪ࡋ࡞࠸ࡇ࡜ࡶ♧၀ࡉandࢀࡓ㸬௒ᚋࡢᒎᮃ࡜ࡋ࡚㸪␗࡞ࡿᆅୗỈ఩ࡢ㧗

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ἲࡢᏳ඲⋡ࡀ୍⮴ࡋ࡞࠸࡜࠸࠺ㄢ㢟ࡢゎỴࡢࡓ

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apparentcohesionofunsaturated

soils,㸦㸬㸬 ཷ௜㸧