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A new penetrometer shown in Figurę 18 is under development. It is called the Phono-sound-ing apparatus, which has been experimented by the Japanese National Railways (JNR)!^) This apparatus records frictional sound of a pene-trating cone in addition to the penctration rcsist-ance and enablcs to distinguish sand and gravel from clayey soils. According to the results so far obtained, this apparatus appears capable of detecting the prcsence of sand seams in weak cohesive soils and checking the continuity of sand drains and also for measuring the settle-ment.of embankments on weak cohesive soils.

Fig. - 17 Fujita S-l Cone Penetration Car ( Fujita CorP.)

Fig. - 18 Phono-Sounding Apparatus

( Railway Technical Research Inst., JNR.)

ACKNOWLEDGEMENTS:

This report has been prepared finally through the discussion by all members of The Committee for Standardizing Sounding Devices and Procedures of JSSMFE. Professor M. Fukuoka of Tokyo Univer3itv and The japanese National Committee on Soil Mechanics and Foundation Engineering revised it and gavc us uscful advices.

Authers also wish to acknowledge all those concerned for the references cited in this paper.

REFERENCES

1)    A.S.T.M.:    Tentative Mcthod of Penctra

tion Test and Split-barrel Samplers of Soils, ASTM Designation:    D1586-53T,

1958.

2)    Arr. by japanese Society of Soil Mech. & Found. Eng. (JSSMFE), Manuał on Subsurface Investigation Mcthod, lst, Revised Edition ( in Japanese), 1972.

3)    Terzaghi, K. & R. B. Pcck: Soil Mechanics in Engineering Practice, 1948.

4)    Mayerhof, G.G.; Penetration Test and Bearing Capacity of Cohensionlcss Soils, Proc. of the A.S.C.E., Journal of Soil Mech. and Found. Div., Vol. 82, No. SM1, 1956.

5)    Koizumi, Y.; Changes in Density of Sand Subsoil Caused by the Niigata Earthąuake, Soils and Foundations, Vol. 6, No. 2, 1966.

6)    Yoshinaka, R. ; The Modulus of Horizon-tal Subgrade Reaction and its Correction on the Loading Wide, ( in Japanese) Civil Engineering Journal, Vol. 10, No. 2, 1968.

7)    lmai, T. & M. Yoshimura; The Relation of Mechanical Properties of Soils to P- and S-Wave Vclocities, ( in Japanese) Butsuri Tanko (Geophysical exploration), Vol. 25, No. 6, 1972.

8)    Fujita, K.; Standard Penctration Test,

( in Japanese), Library of Soil Engineering, JSSMFE, Vol. 4, 1968.

9)    Inada, M.:    Application of Results of

Swedish Sounding Tests, ( in japanese), Tsuchi-to-Kiso, JSSMFE, Vol. 8, No. 1 1960.

10)    Ikeda, T., & T. Muromachi; Methods for Subsurface Exploration, ( in Japanese), Tetsudo-Gengyosha, 1967.

11)    Research data of the Committee for Standardizing Sounding Devices and Procedures (in Japanese), JSSMFE, 1973.

12)    Muromachi, T.; Experimental Study on Application of Static Cone Penetrometer to Subsurface lnvestigation of Soft Sub-soils, ( in Japanese), Railway Technical Research Report, J.N.R., No. 757, 1971.

13)    Fukuda , H.; On the In-situ Sounding Car of Continuous Recording Type, ( in Japanese), Tsuchi-to-Kiso (JSSMFE), Vol. 10, No. 10, 1962.

14)    Yano, K., & M. Kama ta; On the S-l Cone Penetration Car, ( in Japanese), Tsuchi-to-Kiso (JSSMFE), Vol. 11,

No. 4, 1963.

15)    Yasue, T., S. Ohkubo; Technical Guide to Slopc lnvestigation (in Japanese), Technical Memorundum of Public Works Research Inst., No.864, The Ministry of Construction, 1973.