2009 Japan-Russia Energy and Environment Dialogue in Niigata S2-6 TANAKA ERINA

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1 Importance of the Site Investigation for Development of Methane Hydrate Hokkaido University Hiroyuki Tanaka

2 Civil Engineer My Background Site Investigation Soil Parameters for Design Very Soft Clay and Loose Sand Mining VS Civil Engineering

3 Difference in the ground condition for usual mining Usual mining Rock (Consolidated) Methane Hydrate Unconsolidated material Deep sea

4 Open Cut Mining Hard Rock

5 Oilrig Deep Sea, Foundation

6 Geotechnical Problems of MH Deep Sea Slope Failure: Explosion of MH Tsunami Design: Stability, Settlement Methane Hydrate Unconsolidated Soils (Very Soft, High Compressibility)

7 How to obtain design parameters In Situ Testing (Sounding) Physical Methods (Acoustic) Dynamic Penetration (SPT) Static Penetration (CPT) Vane Testing Laboratory Testing Sampling

8 Acoustics Method (Ocean) Developed for Oil Exploration Source (Frequency high: accurate, shallow low: deep) (multi receivers) Recently, this method is widely used to detect active faults.

9 Standard Penetration Test (SPT) Height = 76 cm Hammer (Mass = 63.5 kg) Knocking Head Definition of N value How many blows for penetration of 30 cm Raymond sampler

10 Static Cone Penetration Measurement of penetration force Friction Point Resistance Development of Dutch Cone

11 Vane Test Soft Clay

12 Sampling in the Lake Baikal Gravity Core

13 CPT Memory Cone: No cable

14 Influence of Sample Quality Unconfined Compression Test Ariake Clay

15 Samplers used at the site

16 Kansai International Airport III Phase I Phase II Phase

17 8(ky BP) 270 Improved by Vertical Drain Ma-2 Ma-1 Ma Marine Clay Lacustrine Clay Lacustrine Sand

18 Sampling Procedure (Wire-Line)

19 Wire-Line method The stage for sampling

20 Hydraulic Sampler Extension Rods Hydraulic Sampler (Osterberg)

21 Rotary core sampler

22 Summaries Precise soil parameters required for MH development Deep Sea water Development of CPT and Samplers

Geotechnical Measurements and Explorations Prof. Nihar Ranjan Patra Department of Civil Engineering Indian Institute of Technology, Kanpur

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