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1 4.330 SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE Total Stress ( at Point ( sat Satrated Soil olmn (Figre 6.. Das FGE (005 from Water from Soil Were: = Unit Weigt of Water sat = Satrated Unit Weigt of Soil = eigt of ater above Soil = Dept of Point belo ater table Slide of 8
2 4.330 SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE Total Stress ( can be divided into Parts:. Portion carried by ater in void spaces. TIS IS TE PORE PRESSURE (. Satrated Soil olmn (Figre 6.. Das FGE (005. Portion carried by soil solids at points of contact. TIS IS TE EFFETIVE STRESS (. Slide of 8
3 4.330 SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE Satrated Soil olmn (Figre 6.. Das FGE (005 Forces acting at Soil Particle Points of ontact at level of Point (i.e. along Line a-a Figre 6.. Das FGE (005 ( along Line a-a P ( P( v P3( v... P v n( v Slide 3 of 8
4 4.330 SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE ( along Line a-a Were: P ( P( v P3( v... P v n( v P (v = Vertical omponent of P Forces acting at Soil Particle Points of ontact at level of Point (i.e. along Line a-a Figre 6.. Das FGE (005 = ross-sectional rea of Soil Mass Under onsideration Slide 4 of 8
5 4.330 SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE Total Stress ( along Line a-a ( a s ( a Were: a s = ross-section rea of Soil s Forces acting at Soil Particle Points of ontact at level of Point (i.e. along Line a-a Figre 6.. Das FGE (005. ontacts = a +a +a 3 + +a n = ross-sectional rea of Soil Mass Under onsideration a s = a s / = Fraction of nit crosssectional area of soil mass occpied by solid to solid contacts. Slide 5 of 8
6 4.330 SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE Total Stress ( along Line a-a ( a s ( a a s 0 (i.e. very small, so terefore: s Figre 6.. Das FGE (005 or TE EFFETIVE STRESS EQUTION Slide 6 of 8
7 4.330 SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE TE EFFETIVE STRESS EQUTION ( sat Figre 6.. Das FGE (005 ' = Total Stress ( ( eigt of soil colmn sat = Pore Pressre ( sat = Sbmerged nit eigt of soil Slide 7 of 8
8 4.330 SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE: EXMPLE PROLEM GIVEN SOIL PROFILE (NTS: FIND: L = 0 lb/ft 3 sat = 05 lb/ft 3 5ft 9ft Total and es at Pts.,,, & D. SM sat = 5 lb/ft 3 6ft ft D Slide 8 of 8
9 GIVEN SOIL PROFILE (NTS: L = 0 lb/ft 3 sat = 05 lb/ft 3 SM sat = 5 lb/ft SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE: EXMPLE PROLEM D 6ft 5ft 9ft ft FIND: Total and es at Pts.,,, & Point : L Z 0 lb (5 ft 3 ft 50 lb ft 0 50 lb ft Slide 9 of 8
10 4.330 SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE: EXMPLE PROLEM GIVEN SOIL PROFILE (NTS: L = 0 lb/ft 3 sat = 05 lb/ft 3 SM sat = 5 lb/ft 3 D 6ft 5ft 9ft Point : ( sat,l X4 ft 50 lb lb 05 (4 ft 3 3 ft ft 930 lb ft 4 ft 6.4 lb lb 4 ft 50 3 ft ft 930 lb lb 50 ft ft 680 lb ft Slide 0 of 8
11 4.330 SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE: EXMPLE PROLEM GIVEN SOIL PROFILE (NTS: L = 0 lb/ft 3 sat = 05 lb/ft 3 SM sat = 5 lb/ft 3 D 6ft 5ft 9ft Point : ( sat,sm 6 ft 930 lb lb 5 (6 ft 3 3 ft ft 60 lb ft 0 ft 6.4 lb lb 0 ft 64 3 ft ft 60 lb lb 64 ft ft 996 lb ft 000 lb (rond to nearest 5 psf ft Slide of 8
12 4.330 SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE: EXMPLE PROLEM GIVEN SOIL PROFILE (NTS: L = 0 lb/ft 3 sat = 05 lb/ft 3 SM sat = 5 lb/ft 3 D 6ft 5ft 9ft Point D: D ( sat,sm ft D 930 lb lb 5 ( ft 3 3 ft ft D 30 lb ft D D D D 6 ft 6.4 lb lb 6 ft ft ft D D D 30 lb lb 998 ft ft D 3 lb ft D 30 lb (rond to nearest 5 psf ft Slide of 8
13 SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE: EXMPLE PROLEM 0 TOTL STRESS ( PORE PRESSURE ( EFFETIVE STRESS (' L = 0 pcf sat = 05 pcf Dept from Existing Grond Srface (ft SM sat = 5 pcf D Use Use Dept from Existing Grond Srface (ft Slide 3 of 8
14 Slide 4 of SOIL MENIS Figre 6.3a. Das FGE ( sat sat sat ( ( ( ( Point : Point : EFFETIVE STRESS ONEPT UPWRD SEEPGE
15 Slide 5 of SOIL MENIS Flo Water Lengt of ange in ead i sat sat ( ( Point : NOTE: i Figre 6.3a. Das FGE (005. EFFETIVE STRESS ONEPT UPWRD SEEPGE
16 4.330 SOIL MENIS EFFETIVE STRESS ONEPT UPWRD SEEPGE RITIL YDRULI GRDIENT (i cr i cr 0 NO EFFETIVE STRESS! Knon as oiling or Qick ondition i cr Figre 6.3a. Das FGE (005. For Most Soils: i cr ranges from 0.9 to., it an average of Slide 6 of 8
17 4.330 SOIL MENIS EFFETIVE STRESS ONEPT UPWRD SEEPGE Figre 6.3b. Das FGE (005. Slide 7 of 8
18 Slide 8 of SOIL MENIS Figre 6.4a. Das FGE ( sat sat sat ( ( ( ( Point : EFFETIVE STRESS ONEPT DOWNWRD SEEPGE Point :
19 Slide 9 of SOIL MENIS Flo Water Lengt of ange in ead i sat sat ( ( Point : i Figre 6.4a. Das FGE (005. EFFETIVE STRESS ONEPT DOWNWRD SEEPGE NOTE:
20 4.330 SOIL MENIS EFFETIVE STRESS ONEPT DOWNWRD SEEPGE Figre 6.4b. Das FGE (005. Slide 0 of 8
21 4.330 SOIL MENIS EFFETIVE STRESS ONEPT PRTILLY STURTED SOIL a ( a Were: a = Pore ir Pressre = Pore Water Pressre = Fraction of nit cross-sectional area of soil occpied by ater. = 0 for dry soil; for satrated soil. Figre 6.6. Das FGE (005. depends on degree of satration (S. lso inflenced by soil strctre. Slide of 8
22 4.330 SOIL MENIS PILLRY RISE IN SOILS Smming Forces in Vertical Direction d c dt cos 4 4T cos c d Were: T = Srface Tension = ngle of ontact d = apillary Tbe Diameter Figre 8.9. Principles of Geotecnical Engineering, Das (006. T,, remain constant c d Slide of 8
23 4.330 SOIL MENIS PILLRY RISE IN SOILS c d Figre 8.0. Principles of Geotecnical Engineering, Das (006. Slide 3 of 8
24 4.330 SOIL MENIS PILLRY RISE IN SOILS aen (930 ed 0 Were: D 0 = Effective Sie (mm e = Void Ratio = onstant (ranging from 0 mm to 50 mm Slide 4 of 8
25 4.330 SOIL MENIS PILLRY RISE IN SOILS Table 8. (Das, PGE 006. pproximate Range of apillary Rise in Soils. Soil Type Range of apillary Rise m ft oarse Sand Fine Sand Silt lay EFFETIVE STRESS IN PILLRY ZONE Satrated: Partially Satrated: S 00 Slide 5 of 8
26 4.330 SOIL MENIS SEEPGE FORE WIT NO SEEPGE (i.e. STTI ONDITIONS ' ( ( eigt of soil colmn = sat ( sat = Sbmerged nit eigt of soil : Effective Force: Were: = rea ' P ' Figre 6.. Das FGE (005. Slide 6 of 8
27 4.330 SOIL MENIS SEEPGE FORE: UPWRD SEEPGE EFFETIVE STRESS EFFETIVE FORE NO SEEPGE: W/ SEEPGE: P i P ( i ' DERESE OF TOTL FORE DUE TO SEEPGE: SEEPGE FORE PER UNIT VOLUME: P P P P (Soil Volme i i i Slide 7 of 8
28 4.330 SOIL MENIS SEEPGE FORE SUMMRY NO SEEPGE UPWRD SEEPGE DOWNWRD SEEPGE Slide 8 of 8
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