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.