Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

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“Step Out From the Old to the New”

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“The Right to Information, The Right to Live”

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“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 4968-1 (1976): Method for subsurface sounding for soils,Part 1: Dynamic method using 50 mm cone without bentoniteslurry [CED 43: Soil and Foundation Engineering]

Gr 3

IS : 4968 ( Part I ) - 1976

Indian Standard Reaffirmed 2007

METHOD FORSUBSURFACE SOUNDING FOR SOILS

PART I DYNAMIC METHOD USING 50 mm CONEWITHOUT BENTONITE SLURRY

( First Revision)

Third Reprint DECEMBER 1994

UDC 624.131.381

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

May 1977

© Copyright 1977

IS I 4968 ( Part I ) • 1976

Indian StandardMETHOD FOR

SUBSURFACE SOUNDING FOR SOILS

PART I DYNAMIC METHOD USING SO mm CONEWITHOUT BENTONITE SLURRY

( First Revision)Soil Engineering Sectional Committee, BDC 23

ChairmallPliOI' DINESH MOHAN

RepresentingCentral Building Research Institute (CSIR).

Roorkee

In personal capacity (P.820, 'P", New .A/ipoTl.Calcutta 700053 )

In personal capacity (5, Hrmf(erjord Court, 12{IHungerford Stmt, Calcutta 700017)

Irrigation Research Insutute, Khagaul PatnaIrrigation Department, Government of Punjab

SaRI A. G. DASTIDAR

MembersADDITION"" DIJtEOTOR RESEARCH Railway Board ( Ministry of Railways )

( RDSO)DEPUTY DIRECTOR RESEARCH

( RDSO ) ( Alternate)Paol' ALAM SINOH Univenity ofJodhpur, JodhpurL'r-CoL tiVTAR SINon Engineer-in-Chiefs Branch Army Headquarters

MA-J R. R. SODJlINDRA ( .AltlTnate )DR A. BANERJEJo; Cementation Co Ltd, Calcutta

SaRI S. GUP'rA ( Alternat, )SHRI K. N. DADlNA

Radio Foundation Engineering Ltd; and H~zarat &:Co, Bombay

SaRI A. N. JANoT.E ( Altemal, )Da SJlASBl K. GULIl."TI Indian Institute of Technology, New Delhi

DR G. V. RAO ( AlttmlJu )SaN V. G. HEODE National Buildings Organi:tation. New Delhi

SBln S. H. BALCHANJ)ANI ( Alternate)

SIIRI R. L. DEWAN-DR o. S. DIIILLON

RESEARCH OFFICJl:R ( SOILS)( IPRI) ( Altnna', )

SaRI A. H. DIVANJI

( Contimud onpOle2 )

-AJaorepresents Indian Geotechnj~1Society, New Delhi

C> Co/I.1ri,h, 1977

BUREAU OF INDIAN STANDARDSThd publicatioD I. protected under tbe IruliQII CA,",",ltt Ad ( XIV or 1957) aDdreprodue:tiOD iD whole or iD part by aDy IDeaDiexcept witb writteD perrai..ioD of thepub1iaher aball be deeIDed to be aD iDfrilllCIDent of copyrigbt UDder tbe laid Act.

IS I 4968 ( Part I ) • 1976

( Conti_dj,,,m ~a" I )

MnnbIrsSHRI O. P. MALJlOTRASaRI J. S. MARYA

IUfJr'Stflti",Public Works Depll:rtment, Government of PunjabR'Ollds Wingt Ministry of Shipping and Transport,

New Dell1iSH1I.I N. SRI( (AUnnat, )

SHRI G. D. MATHUR Public Works Department, Government of UttarPradesb

SOl D. C. CHATl1.RVlI:Dr ( AUcrtaat, )SHRI R. S. MELItOTE Central Water Commission, New ~lhi

SHlU C. SUDHINDRA ( Altcma/' )SHIn T. K. NATARAJAN Central Road Research Institute I CSIR), New DelhiRURESENTATIVIIl Hindustan Construction Co Ltd, BomhayRESuReR OJTIOER Building and Roads Research Laboratory,

ChandigarhDR K. R. Sn:ENA Engineering Research Laboratories, HyderabadSEORETARY Central Board of Irrigation 8t Power. New Delhi

DEPUTY SEOItETARY ( Alt,mau )-DR SBAII8HEB PRAKASH University of Roorkee, Roorkee

DB GOPAL RANJAN ( Alternau )SHIn H. D. SHABMA Irrigation Research Institute, RoorkeeSUPE1UNTENDUfO ENoINEEB Public Works Department, Government of Tamil

NaduEXEOUTIVE ENOINEER ( All""",t, )

SHBI B. T. UNWALLA Concrete Association oflndia, BombaySaRI T. M. MOON (AIa,mat.)

SHIn H. C. VUJU All India Instruments Manufacturers 8t Dealer.Association, Bombay

SHRI V. K. V....UDEVAN ( Alumau)SRRI D. AmRA SIMHA, Director General, lSI ( Ex-officio M,mbt, )

Director (Civ Engg )

&""'a,,SaRI G. RAMAN

Deputy Director (Civ Engg), lSI

Site Exploration and Investigation for FoundationsSubcommittee, BDC 23 : 2

COII_'SSRI R. S. MRLKOTII Central Water Commission, New Delhi

M'mHrISHill C. SUDRI14DBA ( Alt,,"'" to

Shri R. S. Mellr.ote)PaOI' ALA. SINOII UniVCI'llity ofJodhpur, JodhpurLr-CoL AVTAB SmGlI Engineer.in-Cbief'1 Branch, Army Headquarten

MAl R. R. StrollInu ( At",." )

( CottIinwtl_IG" 9 )

-Also repreleDta Irutiturion of En,iDeen ( ladla ). Delhi Centre.

2

AMENDMENT NO. 1

TO

OCTOBER 1987

IS:4968(Part 1)-1976 METHOD FOR SUBSURFACESOUNDING FOR SOILS

PART 1 DYNAMlr METHOD USING 50 IDID CONE WITHOUTUENTON1TE SLURRY

(First Revision)

(Pages 3 and 4) - Substitute '15:2131-1981'for '15:2131-1963'.

(Pages 3 ~~_ 4, footnote with '*' mark)Substitute the following fn~ the existinp fn~tnote:

'*Method of standard penetration test for solIs(first revision).'

(Pages 4 _~ 6, clause 2) - Substitute thefollowing for the existing clause:

"2. EQUIPMENT

2.1 The cone driving rods, driving head, hoistingequipment shall conform to 15:10589-1983'Specification for equipment for determination ofsubsurface Bounding of soils'."

(Pages 5 and 7) - Delete Fig. 1 and 2.

(BDC 23)

Repr og raphy Unl t, BIS, New Delhi, India

IS & 4968 ( Part I ) • 1976

Indian StandardMETHOD FOR

SUBSURFACE SOUNDING FOR SOILS

PART I DYNAMIC METHOD USING 50 mm CONEWITHOUT BENTONITE SLURRY

(First Revision)

O. FOR E W 0 R D

0.1 This Indian Standard (Part I ) ( First Revision) was adopted bythe Indian Standards Institution on 22 December 1976, after the draftfinalized by the Soil Engineering Sectional Committee had been approvedby the Civil Engineering Division Council.

0.2 The resistance Ned (see Note) to penetration of the cone in terms ofnumber of blows per 300 mm of penetration may be correlated with thebearing capacity of cohesionless soils and also possibly with the loadcarrying capacity of piles. The correlations are qualitative rather thanquantitative in nature and are influenced by the character of the soils,such as grain-size distribution, surcharge pressure, permeability, anddegree of saturation. The extra work required to determine the pene­tration reslstance is small compared to the value of the data obtained,but these data only provide a rough indication of the consistency orrelative density of the soil.

NOTIlI- The resistance to penetration in the standard penetration teat (IS: 2131.1963- ) ahall be designated as N. tbat to a 50 mm cone as Ned and that to a 62'5 mmcone using bentonite Ilurry al Ncbr (IS: 4968 ( Part n )-1976t ].

0.2.1 Correlation between cone penetration values (Ned) andpenetration values obtained by other methods may be developed for agiven site by conducting the latter tests adjacent ( about 3 to 5 m) tothe location of the Cone test ( see Note ).

NO'J'lI- However for the 62'S mm cone driven dry up to a depth of 9 m ( withoutbentonite slurry) [SII IS: 4968 (Part II ).1976t ], for medium to fine aanda, thefollowing relatiolllhiJIII have ~ ,deve1opecl I;( the Central B~il~ing R.eaearchIDItitute, Roorkee. These relauonships, when utilieed, lhall be used With caution.

Ncbr - 1·5 Nup to a depth of 4 mNcbr - 1'75 N for depths of 4 to 9 m,

-Method (or standard penetration teat (or lOill.tMetbod (or lubaurface lOunding (or IOUI: Part II Dynamic method uling cone and

bentonite Ilurry (/irs' flllisi.. ).

3

18 I 4968 ( Part I ) • 1976

where

Ncbr - cone reslstance obtained with a 62'5 mm cone driven dry ( number ofblows for 300 mm penetration ); and

N - resistance to penetration in the .tandard penetration test ( in accord­ance with IS: 2131.1963·), (number of blow. for 300 mmpenetration ).

0.3 This standard was first published in 1968. In this revision severalchanges have been made taking into consideration the experience gainedin conducting the test and in the manufacture of the equipment. Themajor changes made relate to the material of the cone and -the hammercriteria for stopping of driving of the cone and the limitations. Referencehas also been made to the automatic arrangement for controlling thedrop of the hammer.

0.4 In the formulation of this standard due weightage has been given tointernational co-ordination among the standards and practices prevailingin different countries in addition to relating it to the practice in the fieldin this country.

0.5 In reporting the result of a test or analysis made in accprdance withthis standard, if the final value, observed or calculated, is to be roundedoff, it shall be done in accordance with IS : 2-1960t.

1. SCOPE

1.1 This standard covers the procedure for determining the resistanceof different soil strata to dynamic penetration ofa So-mm cone and therebyobtaining an indication regarding their relative strengths or density orboth. The method helps reconaissance survey of wide areas in a shortertime which will enable selective in situ testing or sampling for typicalprofile. It can provide useful data for local conditions where rebablecorrelations have been established.

2. EQ.U1PMENT

2.1 CODe ~ The cone with threads (recoverable) shall be of suitablesteel with the tip hardened. The cone without threads (expendable)may be of mild steel. The dimensions an~ shape of the cone shall be asgiven in Fig. IA and l B, For the cone Without threads, a cone adopteras shown in Fig. Ie shall be provided.

NOTE - The cone without threadJ will be left in the ground after the completion ofthe test.

• Method for standard penetration test for will. ,tKules for rounding off numerical valua ( "fts,d).

4

IS I t968 ( Part I ) • 1976

~22~.S~-,40

.iu..&o"t 15'

SQUARE THREADS OF

'It. ROD COUPLING

......-~...-so ±0·05 t/) 50 t 0·05 t/)

1A CONE 1B THREADED CONE

~32t1J

~ S~~ARE THREADS OF

40 A ROD COUPL~G

'~,.a.-.t-......,

43

Lj

1C CONE ADOPTER

All dimensionl in millimetres.

Flo. 1 CONK AND CoNE ADoPTER

5

[S I f968 ( Part I ) • 1976

2.2 DrivlDI Rod. - The rods used for the test should be A rods ofsuitable lengths with threads for joining A rod coupling at either end.The rods should be marked at every 100 mm.

NOTE - The outer and internal diameters of If rods are 41'27 mm and 28'57 mmrespectively.

2.3 DrivlDI Head - The driving head shall be of mild steel withthreads at either end for a rod coupling ( see Note under 2.2). It shallhave a diameter of 100 mm and a length of 100 to 150 mm..

2.4 Hoiadag EqalpmeDt - Any suitable hoisting equipment, such asa tripod may be used. The equipment shall be designed to be stable underconditions of impact of the hammer over the driving head when the coneis driven during the test. Provision shall be made to enable the operatorto climb up the equipment for fixing the pulley, ropes, etc. A typicalset-up using a tripod is shown in Fig. 2. Suitable guides shall be providedto keep the driving rod vertical.

2.5 Hammel' - The hammer used for driving the cone sh,all be of mildsteel or cast iron with a base of mild steel. It shall be 250 mm high andof suitable diameter. The weight of the hammer together with the chainshall be 65 kg. It shall have a hole at the centre running throughout itslength and of suitable diameter for A rod (Sit Note under 2.2) and/orguide to pass freely through it. The clearance between the rod and/orguide and the hole in the hammer shall be about 5 mm,

NOTE - An automatic arrangement for controlling the drop of the hammer may bepreferred. if available.

:J.PROCEDURE

3.1 The 50 mm diameter 60° cone shall be fitted loosely to the drivingrod ( A rod ) (SII Note under 2.2 ) through a cone adopter or the threadedcone shall be screwed to the driving rod. The hammer head shall bejoined to the other end of the A rod with A rod coupling. A guide rod150 em long shall be connected to the hammer head. This assembly shallbe kept vertical, with the cone resting on the ground to be tested. Thecone shall then be driven into the soil by allowing the 65 kg hammerto fan freely through a heightof750 mm each time. The number of blowsfor every 100 mm penetration of the cone shall be recorded. The processshall be repeated till the cone is driven to the required depth (see Noteand ••1).

NOT. - To ave the equipment frOID dama~, driving may be stopped when thenumber of bloWi exceeda !IS for 100DUD penetrataon.

6

IS &4968 (Part I) -1976

IDRIVING HEAD

DRIVING ROD 'A'

A~RANGENENT

FOR KEEPINGROD VERTICAL

CONEADOPTER

65 kg HANNER

GL

Flo. 2 TYPICAL AssEMBLY OF EQ.UJPIoIENT FOilCONE PENETRATION TEn

7

IS I 4968 ( Part I ) • 1976

4. LIMITATIONS

4.1 The maximum depth to which the cone should be driven will dependupon the type of soil, the position of the water table and the purpose ofthe test. If correlations of cone penetration values obtained by othermethods is desired in interpretation, in cohesionless soils the depth maybe limited to 5 m; in mixed soil with some binding material the depthmay be 10m. If the test is used for obtaining a general qualitative ideaof the strata, the cone may be driven to any convenient depth.

5. REPORT

5.1 The number of blows ( Ned) as a continuous record for every 300 mmof penetration shall be shown in a tubular statement or shown as a graphbetween Ned and depth. Records of the test shall also include thefollowing:

a) Date of probing;b) Location;c) Elevation of ground surface;d) Depth of water table and its likely variation, from available

information;e) Total resistance-at the required levels;f) Any interruption in probing, with reasons;g) Any other information available, for example, type of soil; andh) Diameter of the cone used in the test.

8

IS I 4968 ( Part I ) • 197.

/UJ1rlSlll'illlCementation Co Ltd, BombayPublic Worb Department, Government of UUIt!'

PradeshRodio Foundation Engineering Ltd; and Hazarat lit

Co, BombayRBllIlABOU Railway Board ( Ministry of Railways)

Central Building Research Institute ( CSIR ),Roorkee

SRal V. S. AGGARWAL ( Allmud,)SIIBI H. C. VUIIA Auoclated Instrwnents Manufacturers India Pvt Ltd,

New Delhi

Hindustan Construction Co Ltd, BombayRoad. Wing, MiniJtry of Shipping & Transport,

New DelhiSUI P. K. TUOIIAI ( AltmlQu)

SUPBJUNTBNDINO SURVEYOR 0" Central Public Worb Department, New DelhiWoalts (I)

Ssal D. SIlABIIA

( (Anlm-d/r,,,, 141' 2 )

M"n6",DB A. s.ullaJDDB A. K. CJIA'l'TIIBlBlI

SUIlI R. C. DUAl

DBPCTY' DIRIIOTOB(FE)( RDSa)

AIII8TAlfT D I B II 0 T a aREIIlABOk (SoILI)( RDSO ) ( Al,.",.,. )

DIRECTOR Maharashtra Engineering Research Institute, NasikRallAROS OJ'l'IOEB ( Al"""'" )

DIRECTOR Gll:lfBRAL Geological Survey of IndiaSllaI S. K. SUOIIB ( Altmlal')SURI P. N. MEHTA ( AII,rnall )

EXBOUTIVJI ENOIlfBEa (SOIL Public Works Department, Government of TamilMJlCUA.lfIC8 DIVISION) Nadu

SBBI T. K. NATABAJ'AN Central Road Research Institute (CSrR ), New DelhiSur H. R. PJlAIIANlJ[ River Research Institute, West Bengal

SUI H. L. SABA. (Allmlillf)RJCJ'aE8ZN'rATlVBSBBI N. SEN

Pac .. T. S. NAGARU ( AIIl1"llilU )

9

BUREAU OF INDIAN STANDARDS

261 71

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