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1 4.53 DVNED SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE Total Stress ( at Point ( sat Satrated Soil olmn (Figre 6.. Das FGE (005 Revised /03 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
2 Revised / DVNED SOIL MENIS EFFETIVE STRESS ONEPT Satrated Soil olmn (Figre 6.. Das FGE (005 NO SEEPGE Total Stress ( can be divided into Parts:. Portion carried by ater in void spaces. TIS IS TE PORE PRESSURE (.. Portion carried by soil solids at points of contact. TIS IS TE EFFETIVE STRESS (.
3 4.53 DVNED SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE Satrated Soil olmn (Figre 6.. Das FGE (005 Revised /03 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
4 4.53 DVNED 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 Revised /03
5 4.53 DVNED 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. Revised /03 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.
6 4.53 DVNED 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 Revised /03 Figre 6.. Das FGE (005 or TE EFFETIVE STRESS EQUTION
7 4.53 DVNED SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE TE EFFETIVE STRESS EQUTION ( sat Revised /03 Figre 6.. Das FGE (005 ' = Total Stress ( ( eigt of soil colmn sat = Pore Pressre ( sat = Sbmerged nit eigt of soil
8 4.53 DVNED 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 Revised /03
9 GIVEN SOIL PROFILE (NTS: Revised /03 L = 0 lb/ft 3 sat = 05 lb/ft 3 SM sat = 5 lb/ft DVNED 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
10 Revised / DVNED 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
11 Revised / DVNED 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
12 Revised / DVNED 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
13 DVNED SOIL MENIS EFFETIVE STRESS ONEPT NO SEEPGE: EXMPLE PROLEM 0 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 Revised /
14 Revised / DVNED SOIL MENIS Figre 6.3a. Das FGE ( sat sat sat ( ( ( ( Point : Point : EFFETIVE STRESS ONEPT UPWRD SEEPGE
15 Revised / DVNED 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 4.53 DVNED SOIL MENIS EFFETIVE STRESS ONEPT UPWRD SEEPGE RITIL YDRULI GRDIENT (i cr i cr i cr 0 NO EFFETIVE STRESS! Knon as oiling or Qick ondition Revised /03 Figre 6.3a. Das FGE (005. For Most Soils: i cr ranges from 0.9 to., it an average of
17 4.53 DVNED SOIL MENIS EFFETIVE STRESS ONEPT UPWRD SEEPGE Revised /03 Figre 6.3b. Das FGE (005.
18 Revised / DVNED SOIL MENIS Figre 6.4a. Das FGE ( sat sat sat ( ( ( ( Point : EFFETIVE STRESS ONEPT DOWNWRD SEEPGE Point :
19 Revised / DVNED 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 4.53 DVNED SOIL MENIS EFFETIVE STRESS ONEPT DOWNWRD SEEPGE Revised /03 Figre 6.4b. Das FGE (005.
21 4.53 DVNED 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. Revised /03
22 4.53 DVNED 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 Revised /03 Figre 8.9. Principles of Geotecnical Engineering, Das (006. T,, remain constant c d
23 4.53 DVNED SOIL MENIS PILLRY RISE IN SOILS c d Figre 8.0. Principles of Geotecnical Engineering, Das (006. Revised /03
24 4.53 DVNED 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 Revised /03
25 Revised / DVNED 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
26 4.53 DVNED 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 ' Revised /03 Figre 6.. Das FGE (005.
27 4.53 DVNED 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: Revised /03 P P P P (Soil Volme i i i
28 4.53 DVNED SOIL MENIS SEEPGE FORE SUMMRY NO SEEPGE UPWRD SEEPGE DOWNWRD SEEPGE Revised /03
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