{"_buckets": {"deposit": "5bdf6a55-4f25-42b0-9147-a2e7db08589b"}, "_deposit": {"id": "8902", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "8902"}, "status": "published"}, "_oai": {"id": "oai:kitami-it.repo.nii.ac.jp:00008902"}, "item_3_alternative_title_198": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "\uff08GRAVITY TYPE CONE PENETRATION TEST ON SEABED OFF EASTERN HOKKAIDO, THE SEA OF OKHOTSK\uff09"}]}, "item_3_biblio_info_186": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2018", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "2", "bibliographicPageEnd": "I_873", "bibliographicPageStart": "I_868", "bibliographicVolumeNumber": "74", "bibliographic_titles": [{"bibliographic_title": "\u571f\u6728\u5b66\u4f1a\u8ad6\u6587\u96c6B3\uff08\u6d77\u6d0b\u958b\u767a\uff09"}, {"bibliographic_title": "Journal of Japan Society of Civil Engineers, Ser. 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As a result, gas dissolved in the pore water will come out of solution and cause disturbance to the soil structure. Consequently, it is difficult to obtain the accuracy in-situ strength.\n Therefore, in this study, gravity type cone penetration test (CPT) was conducted off the coast of Eastern Hokkaido in the Sea of Okhotsk, where shallow methane hydrates existed, and tried a direct measurement of the sea ground strength. In addition, the influence of sample disturbance of core sample was evaluated in comparison with the onboard test results. As a result, it is found that the onboard test result is underestimated in the sample with high concentration of dissolved gas and with much sand content. On the other hand, the in-situ strength can be evaluated by the simple gravity type CPT. 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