shear strength of soil - kkw.rmutr.ac.th strength of soil.pdf · unconsolidated undrained (uu) test...
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil1
RMUTRRMUTR--KKW CampusKKW Campus
กําลงัตานทานแรงเฉือนของดิน
บรรยายโดย ผูชวยศาสตราจารยชูศกัด์ิ คีรรีัตน
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil2
RMUTRRMUTR--KKW CampusKKW Campus
แรงเคนเฉือนและแรงเคนตั้งฉากตามระนาบแรงเคนเฉือนและแรงเคนตั้งฉากตามระนาบ
Normal and Shear Stress along Plane
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil3
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Normal Stress along Plane (σn)
Shear Stress along Plane (τn)
Principal Plane (τn = 0)
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil4
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แรงเคนหลักแรงเคนหลัก (Principal Stress)(Principal Stress)
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil5
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วงกลมมอรวงกลมมอร (Mohr (Mohr ’’s Circle)s Circle)
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil6
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ขั้นตอนการวาดวงกลมมอร
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil7
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วิธีหาจุดวิธีหาจุดโพลโพล (Pole (Pole ’’s Method or Origin of Plane)s Method or Origin of Plane)
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil8
RMUTRRMUTR--KKW CampusKKW Campus
การหาความเคนท่ีระนาบใดๆดวยวิธีจุดโพล
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil9
RMUTRRMUTR--KKW CampusKKW Campus
การหาทิศทางที่แรงเคนหลักกระทําการหาทิศทางที่แรงเคนหลักกระทํา (Principal Plane)(Principal Plane)
การหาทิศทางที่แรงเคนหลักกระทํา
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil10
RMUTRRMUTR--KKW CampusKKW Campus
ExampleExample
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil11
RMUTRRMUTR--KKW CampusKKW Campus
1. วิธีจุดโพล (Pole Method)
σ1 = 44.1 kN/m2
σ3 = 15.9 kN/m2
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil12
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2. ใชสมการ (Equation Method)
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil13
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil14
RMUTRRMUTR--KKW CampusKKW Campus
เงื่อนไขการวิบัติของเงื่อนไขการวิบัติของมอรมอร -- คูคูลอมบลอมบ
φσn
τf
R
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil15
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σftanφ
c
τf
Shear Strength consist of 2 components : Cohesion and Frictional
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil16
RMUTRRMUTR--KKW CampusKKW Campus
c and φ are called “Shear Strength Parameters” that measures of shear strength test.
Higher the values, higher the shear strength.
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil17
RMUTRRMUTR--KKW CampusKKW Campus
ระนาบเอียงของการวิบัติเนื่องจากการเฉือนระนาบเอียงของการวิบัติเนื่องจากการเฉือน
σ3 σ1
σ3 σ1
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil18
RMUTRRMUTR--KKW CampusKKW Campus
เงื่อนไขกําลังตานทานตอแรงเฉือนของดินเงื่อนไขกําลังตานทานตอแรงเฉือนของดิน
ดิน φ - soil ดิน c - soil
ดิน c - φ soil
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil19
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ExampleExample
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil20
RMUTRRMUTR--KKW CampusKKW Campus
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil24
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil25
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil26
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil27
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil28
RMUTRRMUTR--KKW CampusKKW Campus
การหาคาพารามิเตอรกําลังตานทานแรงเฉือนการหาคาพารามิเตอรกําลังตานทานแรงเฉือน 1. Direct Shear Test
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil29
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil30
RMUTRRMUTR--KKW CampusKKW Campus
แผนภาพการทดสอบ
ลักษณะการเฉือน
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil31
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ผลการทดสอบ
(OC - Soil)
(NC - Soil)
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil32
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil33
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การหาคา Shear Strength Parameters
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil34
RMUTRRMUTR--KKW CampusKKW Campus
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil36
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ExampleExample
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil37
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil41
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2. Triaxial Compression Test
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil42
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การเตรียมตัวอยางดินเหนียว
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil44
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การเตรียมตัวอยางดินทราย
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil45
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ตัวอยางดินที่เตรียมเสร็จแลว
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil46
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil47
RMUTRRMUTR--KKW CampusKKW Campus
1. Consolidated Drained (CD) test2. Consolidated Undrained (CU) test3. Unconsolidated Undrained (UU) test
ชนิดของการทดสอบแรงอัดแบบสามแกน
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil48
RMUTRRMUTR--KKW CampusKKW Campus
Granular soils have no cohesion.c = 0 & c’= 0
For normally consolidated clays, c’ = 0 & c = 0.
For unconsolidated undrained test, in
terms of total stresses, φu = 0
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil49
RMUTRRMUTR--KKW CampusKKW Campus
no excess pore pressure throughout the test
very slow shearing to avoid build-up of pore pressure
Consolidated Drained (CD) Test
gives c’ and φ’
Can be days!∴ not desirable
Use c’ and φ’ for analysing fully drainedsituations (e.g., long term stability, very slow loading)
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil50
RMUTRRMUTR--KKW CampusKKW Campus
pore pressure develops during shear
faster than CD (∴preferred way to find c’ and φ’)
Consolidated Undrained (CU) Test
gives c’ and φ’
Measure σ’
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil51
RMUTRRMUTR--KKW CampusKKW Campus
pore pressure develops during shear
very quick test
Unconsolidated Undrained (UU) Test
analyse in terms of σ gives cu and φu
Not measured∴σ’ unknown
= 0; i.e., failure envelope is horizontal
Use cu and φu for analysing undrainedsituations (e.g., short term stability, quick loading)
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil52
RMUTRRMUTR--KKW CampusKKW Campus
Consolidated – drained (CD) triaxial test
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil53
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil54
RMUTRRMUTR--KKW CampusKKW Campus
ExampleExample
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil55
RMUTRRMUTR--KKW CampusKKW Campus
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RMUTRRMUTR--KKW CampusKKW Campus
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RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil58
RMUTRRMUTR--KKW CampusKKW Campus
Consolidated – undrained (CU) triaxial test
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil59
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil60
RMUTRRMUTR--KKW CampusKKW Campus
ExampleExample
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil61
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil62
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil63
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil64
RMUTRRMUTR--KKW CampusKKW Campus
Unconsolidated – undrained (UU) triaxial test
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil65
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil66
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เสนทางของหนวยแรง (Stress Path)
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil68
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ExampleExample
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil69
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil70
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil71
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil72
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3. Unconfined Compression Test
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil73
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil74
RMUTRRMUTR--KKW CampusKKW Campus
45°
σ3 = 0
= Su
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil75
RMUTRRMUTR--KKW CampusKKW Campus
Quick Clay
ความไวตัว (Sensitivity)
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil76
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ExampleExample
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil77
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil78
RMUTRRMUTR--KKW CampusKKW Campus
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4. Field Vane Shear Test
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil80
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil81
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5. Pocket Penetrometer
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil83
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil84
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6. Torvane Shear
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil85
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ExampleExample
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil86
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil87
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil88
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil89
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil90
RMUTRRMUTR--KKW CampusKKW Campus
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Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil91
RMUTRRMUTR--KKW CampusKKW Campus
Soil Mechanics (Soil Mechanics (Asst.Prof..ChusakAsst.Prof..Chusak Kererat)Kererat)Shear Strength of SoilShear Strength of Soil92
RMUTRRMUTR--KKW CampusKKW Campus
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