COMPLIANCE INFO_NL STDY - Laserfiche WebLink

Home Browse Search

D 3385 Dj jau ocaficn.TD�1H0-4l Qit..✓l�l// Cm — °G �'.. u_trl LtStu4 l.blflll _ ° i ;'R. ' go ./7Ve.Tem,f+." 14L0 L1"3" �a l� �1 i YC _j 5o,"/Prate/• i ! d O.� _1LO ' to DGscrrp F►a7r �t h I Sl I 1' +�! � '! f Irk f' _ .Inn w rir�p ��f ✓,f � ' h ' ":l:' _444. fJnJr,Jar �Pa.c¢� �r � 5•,u�fa(`s��_ -� ... _� 'i; Wye}ded, -- Ih k ' ' 3 ' acv ym S$ L 6 layAfed r.M' 41-jAp. _t&22— f FIG.4 Report Form for trifittratlon Test With Sample Data center of the ring with the rubber mallet, as slight tamping 8.6.2 When manually controlling the flow of liquid, a depth vibrations will reduce hang-ups and.tilting of the ring. gage is required to assist the investigator visually in maintain- 8.4.3 Add additional weight to the truck if needed to ing a constant head. Use a depth gage such as a steel tape or Lclop sufficient force to drive the ring. rule for soils having a relatively high permeability; for soils AA Check the rings with'the level, correcting the attitude having a relatively low permeability use a hook gage or simple €the rings to be vertical, ashneeded. point gage. Rg 5 Tamping Disturbed Soil: 8.6.3 Install the depth gages,constant-level valves,or Mari- 5.1 if the surface of the;soil surrounding.the wall of the Otte tubes as shown in Fig. 2, and in such a manner that the (s} is excessively disturbed (signs of extensive cracking, reference head will be at least 25 mm {1 in_} and not greater xcessive heave, and the like), reset the ring(s) using a than 150 mm (6 in.). Select the head on the basis of the L5.2 nique that will minimizelsuch disturbance, permeability of the soil, the higher heads being required for if the surface of the�Isoil surrounding the wall.of the lower permeability soils. Locate the depth gages near the ing(s) is only slightly disturbed, tamp the disturbed soil center of the center ring and midway between the two rings. Ajacent to the inside and outside wall of the ring(s) until the 8.6.4 Cover the soil surface within the center ring and II is as firm as it was prionto disturbance. between the two rings with splash guards (150-mm (6-in.) 6 Maintaining Liquid Level: square pieces of burlap or rubber sheet) to prevent erosion of 8.6.1 There are basically three ways to maintain a constant the soil when the initial liquid supply is poured into the rings. ad (liquid level) within t1le inner ring and annular space 8.6.5 Use a pail to fill both rings with liquid to the same [ween the two rings: manuilly controlling the flow of liquid, desired depth in each ring-Do not record this initial volume of he use of constant-level float valves, or the use of a Mariotte liquid. Remove the splash guards. a=be. 8.6-6 Start flow of fluid from the graduated cylinders or L 375