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AMERICAti SOCIETY FOR TESTING AND MATERIALS - 1916 (lace St., Philadelphia. Pa. 19103 fitJ •n•m l • ; of fr r: .I... -, , A.T\. ..�� .fJ Standard AvIethod for PENETRATION TEST ANU SPLIT-B:1.R_R::L S.431PLING OF SOILS1 ASTM Designation: D 1586 - 57 -7 This Standud of the American Society for Testing and Materials is issued under the fixed designation D 1586; the number immediately following the designs- : lion indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the yeas of Lut rmpproval. 1. Scope 1.1 This method describes a procedure for using a split -barrel sampler to obtain representative samples of soil for identifi. cation purposes and other laboratory tests, and to obtain a measure of the resistance of the soil to penetration of tie sampler. 2. Apparatus 2.1 Drilling Equipmenl--Any drillin; equipment shaL be acceptable that pro- vides a reasonably clean hole before insertion of the sampler to ensure that the penetration test is performed or, un. disturbed soil, and that will permit the driving of the sampler to obtain the sample and penctration record in ac. cordance with the procedure described in J. Procedure. To avoid "whips" under the blows of the hammer, it is recom. mended that the drill rod have a stiffness equal to or greater than the A -roc:. An "A" rod is a hollow drill rod or "steel" having an outside diameter of ig in. or 41.2 rnm and an inside diameter of 11 io. or 28.5 mm, through which the rotary motion of drilling is transferred t Untler the standard! iation procedure or the Society, this method is under the jurisdiction of the ASTM Committee D-18 on Soil and Rock for Engineering Purposes. A list of members ma\- he lound in the ASTM Pent hook. Current edition accepted Opt. 20, 1967. Originally issued 1958, Rrplacns D 1586 - fib T. x 11vornlev, ;tl. J...Surjacs Erp(v,rlan one Sampling 01' Soils for Civil Enoitwering purpoua, The Engineering Foundation, 345 Last 47th St., New %*ork. N. Y. V017. from the drilling motor to the cutting bit. A stiffer drill rod is suggested for holes deeper than 50 it (13 m). The hole shall be limited in diameter to betwt:en 2; and 6 in. (57.2 and 152 mm) - 2.2 Split -Barrel Sampler --The sam. pler shall be constructed with dic dimen- sions indicated in Fig. 1. The drive shoe shall be of hardened steel and shall be replaced or repaired when it becomes dented or distorted. The coupling head shall have four $-in. (12.7-mm) (mini- mum diameter) vent ports and shah contain a baU check valve. If sizes other than the 2-in. (50.S-mm) sampler are permitted, the size shall be conspicuously noted on all penetration records. 2.3 Drive lVeighi Asstm6iv-,ne a:- sernhly sh;,ll consist of a 140-lb (63.3.'s,) weight, a driving head, and a guide permitting a free fall of 30 in. (0.76 m). Special precautions shall be taken to ensure that the energy of the falling weight is not reduced by friction be. tween the drive weight and the guides. 2.4 Accessory Equipment --- Labels, data sheets, sample jars, paraffin, and other necessary supplies should accom. pany the sampling equipment. 3. Procedure 3.1 Clear out the hole to sampling elevation using eq,iiprnent that will en. sure that the material to be sampied is not disturbed by the operation. In sat. urated sands and silts withdraw the drill bit slowly to prevent loosening of the soil around the hole. Maintain the water level in the hole at or above ground water level. 3.2 In nc case shall a bottom -dis- charge bit be permitted. (Side -discharge bits are permissible.) The process of jetting through an open -tube sampler and then sampling when the desired depth is czached shall not be permitted. tk-here casing is used, it may not be driven below sampling elevation. Record any loss of circulation or excess pressure in drilling I'.uid during advancing of holes. 3.3 With the sampler resting on the bottom of the, hole, drive the sampl;° with blows from the 140-lb (63.5-1-g) hammer falling 30 in. (0.76 m) un:11 either 18 in. (0.45 rn) have been pene- trated or 100 blows have been applied. 3.4 Repeat this operation at intervals not longer than 5 ft (1.5 m) in homogene- ous strata and at every change of strata. 3.5 Record the number of blows re- quired to effect each 6 in. (0.15 m) of penetration or fractions thereof. The first 6 in. (0.15 m) is considered to be a seating drive. The number of blows re- quired for the second and third 6 in. (0.15 m) of penetration added is termed the penetration resistance, N. If the sampler is driven less than 18 in. (0,45 m), the penetration resistance is that for the last 1 ft (0.30 m) of penetration (if less than 1 ft (0.30 m) is penetrated, the logs shall state the number of blots and the fraction of 1 ft (0,30 :n) penetrated). 3.6 Bring the suppler to the surface and open. Desco,be carefuUy typical