subsurface investigation
DESCRIPTION
Subsurface Investigation. Building structure system. FIELD TESTING. Soil Boring Machine. Flight Auger system Wash Boring. Rotary Drilling. Undisturbed Machine Require. Wash Boring. Rotary Drilling Percussion Drilling. Thin wall (Shelby tube). Split Sampler. Sampling. - PowerPoint PPT PresentationTRANSCRIPT
Subsurface Investigation
Building structure system
FIELD TESTING
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Soil Boring Machine
• Flight Auger system
• Wash Boring
Rotary Drilling
•Undisturbed•Machine Require
Wash Boring
•Rotary Drilling•Percussion Drilling
Sampling
Thin wall (Shelby tube)
Split Sampler
PHYSICAL PROPERTIES ATTERBERG LIMITS ENGINEERING PROPERTIES
Wn g LL PL PI Su Su from Ncor N Ncor
From To % t/m3 #4 #200 % % % t/m2 t/m2 blows/ft blows/ft
1.50 2.00 31.17
3.00 3.50 33.32 1.83 37.00 15.69 21.31 CL 3.88
4.50 5.00 41.71
6.00 6.50 59.40 1.67 63.60 27.52 36.08 CH 0.37
7.50 8.00 80.10
9.00 9.50 76.08 1.53 88.00 36.78 51.22 CH 0.13
10.50 11.00 57.31
12.00 12.50 68.26
13.50 14.00 63.05 79.40 33.28 46.12 CH 0.50
15.00 15.50 24.12
16.50 16.95 26.90 1.98 14.70 33 24
18.00 18.45 27.62 1.83 83.20 26.18 57.02 CH 15.31 35 25
19.50 19.95 26.96 1.85 16.53 39 27
21.00 21.45 19.15 2.21 100.00 76.01 35.80 17.21 18.59 CL 13.17 28 22
22.50 22.95 19.14 1.95 18.38 45 30
24.00 24.45 20.08 1.88 20.51 52 34
25.50 25.95 21.30 1.91 100.00 60.11 31.20 18.80 12.40 CL 14.70 33 24
27.00 27.45 17.59 82 48
28.50 28.95 24.57 100.00 30.17 SM 100 58
30.00 30.45 24.28 180 98
31.50 31.95 25.94 1.97 68.10 22.31 45.79 CH 20.21 51 33
33.00 33.45 26.14 1.86 15.92 37 26
34.50 34.95 23.21 1.95 15.00 34 25
36.00 36.45 20.79 2.08 59.20 14.47 44.73 CH 32.00 90 53
37.50 37.95 18.58 2.00 29.32 81 48
39.00 39.45 23.92 2.20 100.00 68.43 38.60 16.10 22.50 CL 32.15 90 53
40.50 40.95 16.56 2.02 27.50 75 45
42.00 42.45 20.13 2.00 100.00 91.55 46.40 9.46 36.94 CL 22.97 60 38
43.50 43.95 13.85 100.00 51.38 25.30 14.96 10.34 CL 86.26 267 141
45.00 45.45 26.57 2.04 37.67 108 62
46.50 46.95 23.05 2.29 45.42 133 74
48.00 48.45 27.83 1.87 77.60 31.36 46.24 CH 14.09 31 23
49.50 49.95 35.75 1.82 12.56 26 21
51.00 51.45 24.34 75 45
52.50 52.95 20.25 100.00 27.45 SM 113 64
54.00 54.45 21.93 63 39
55.50 55.95 24.44 100 58
57.00 57.45 23.70 100.00 25.11 SM 150 83
58.50 58.95 19.00 240 128
60.00 60.45 15.45 100.00 25.30 SM 200 108
ST-03
ST-04
ST-05
ST-06
Sample No. Depth, m Soil
Class.% passing
ST-02
ST-07
ST-08
ST-09
ST-10
ST-01
SS-15
SS-16
SS-17
SS-18
SS-11
SS-12
SS-13
SS-14
SS-23
SS-24
SS-25
SS-26
SS-19
SS-20
SS-21
SS-22
SS-31
SS-32
SS-33
SS-34
SS-27
SS-28
SS-29
SS-30
SS-35
SS-36
SS-37
SS-38
SS-39
SS-40
Standard Penetration test
Field TestingStandard Penetration Test (SPT)
ASTM D1586 –140 lb (63.5 kg)- Falling 30 inches (0.76 cm)Test in 3 interval @ 150 mmUse only the 2 last 2 interval =150x2 =300 mm = 1 ftThe unit is Blow per foot
Interpretation
•Classify soil to be clay or sand• C for clay• f for sand•Calcuate the strength parameter
-Correction for SPT-Calculate the strength parameter
Strength parameter for sand (Peck’s Approach)15 0.5( 15)corrected measuredN N
35f
•No effective stress calculation•Empirically correlation
Parry (1977)
Adjustment with overburden pressure
60 1 N 60(N ) C N
0.5
N '0
a
1C
p
N '0
a
2C1
p
Correction for N-value according overburden pressure
Correlation qu vs N (Sambhandharaksa, 1985)
Strength parameter for clay
corc 6N (kPa)
15 0.5( 15)corrected measuredN N
Procedure for classify soil
•Start with water content and unit weight•Check strength parameter with index properties•Divide soil layer
¦³Á£ ·� � � � ·ÁºÉ°¤Ân� � � � � (Cohesive Soil) ·Å¤nÁºÉ°¤Ân� � � � � (Cohesionless Soil)
SPT N-value Consistency UC-test (kPa) SPT N-value Consistency Dr (%) 0-2 Very Soft 0-25 0-5 Very Loose 0-5 2-5 Soft 25-50 5-10 Loose 5-30 5-10 Medium 50-100 10-30 Medium 30-60 10-20 Stiff 100-200 30-50 Dense 60-95 20-30 Very Stiff 200-400 >30 Hard >400
Soil Boring
•Number of Boring•Depth of boring
ThailandDepth of Boring is 30 or 60 m.