{"_buckets": {"deposit": "9578d89d-f171-4552-9cd4-f395e8e8baff"}, "_deposit": {"id": "7900", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "7900"}, "status": "published"}, "_oai": {"id": "oai:kitami-it.repo.nii.ac.jp:00007900", "sets": ["1"]}, "item_3_alternative_title_198": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "Soil properties of sediments obtained from sea and lake-bottom shallow type gas hydrate province- Evaluation of sample disturbance due to exsolution of dissolved gas in pore water -"}]}, "item_3_biblio_info_186": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2012", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "4", "bibliographicPageEnd": "516", "bibliographicPageStart": "503", "bibliographicVolumeNumber": "7", "bibliographic_titles": [{"bibliographic_title": "\u5730\u76e4\u5de5\u5b66\u30b8\u30e3\u30fc\u30ca\u30eb"}]}]}, "item_3_description_184": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "\u8868\u5c64\u578b\u30ac\u30b9\u30cf\u30a4\u30c9\u30ec\u30fc\u30c8\u304c\u5b58\u5728\u3057\u3066\u3044\u308b\u30aa\u30db\u30fc\u30c4\u30af\u6d77\u30b5\u30cf\u30ea\u30f3\u5cf6\u6c96\u304a\u3088\u3073\u30ed\u30b7\u30a2\u30fb\u30d0\u30a4\u30ab\u30eb\u6e56\u306b\u304a\u3044\u3066\uff0c\u6d77\u5e95\u30fb\u6e56\u5e95\u8868\u5c64\u5730\u76e4\u304b\u3089\u5806\u7a4d\u571f\u3092\u63a1\u53d6\u3057\u305f\u3002\u63a1\u53d6\u3057\u305f\u5806\u7a4d\u571f\u306b\u5bfe\u3057\u3066\uff0c\u8abf\u67fb\u8239\u4e0a\u3067\u5c0f\u578b\u306e\u30d9\u30fc\u30f3\u305b\u3093\u65ad\u8a66\u9a13\u3068\u30b3\u30fc\u30f3\u8cab\u5165\u8a66\u9a13\u3092\u884c\u3044\u5806\u7a4d\u571f\u306e\u529b\u5b66\u7279\u6027\u3092\u8abf\u3079\u305f\u3002\u307e\u305f\uff0c\u8a66\u6599\u5f15\u304d\u4e0a\u3052\u6642\u306e\u9593\u9699\u6c34\u5727\u6e1b\u5c11\u306b\u3088\u308a\uff0c\u6eb6\u5b58\u30ac\u30b9\u304c\u6c17\u6ce1\u5316\u3057\u8a66\u6599\u306b\u4e71\u308c\u304c\u751f\u3058\u308b\u3053\u3068\u304b\u3089\uff0c\u30ac\u30b9\u6fc3\u5ea6\u3068\u5f37\u5ea6\u3068\u306e\u95a2\u4fc2\u306b\u3064\u3044\u3066\u3082\u8abf\u3079\u305f\u3002\u3055\u3089\u306b\uff0c\u8a66\u6599\u63a1\u53d6\u304b\u3089\u5ba4\u5185\u8a66\u9a13\u306b\u81f3\u308b\u307e\u3067\u306e\u5fdc\u529b\u6761\u4ef6\u3092\u518d\u73fe\u3057\u305f\u5b9f\u9a13\u3092\u884c\u3063\u305f\u3002\u305d\u306e\u7d50\u679c\uff0c\u9593\u9699\u6c34\u4e2d\u306e\u6eb6\u5b58\u30ac\u30b9\u306e\u6fc3\u5ea6\u304c\u9ad8\u3044\u307b\u3069\uff0c\u8239\u4e0a\u8a66\u9a13\u306b\u304a\u3044\u3066\u3082\u518d\u73fe\u5b9f\u9a13\u306b\u304a\u3044\u3066\u3082\u5f37\u5ea6\u4f4e\u4e0b\u304c\u5927\u304d\u304f\u306a\u308b\u50be\u5411\u306b\u3042\u3063\u305f\u3002\u307e\u305f\uff0c\u6eb6\u5b58\u30ac\u30b9\u306e\u6c17\u6ce1\u5316\u306b\u3088\u308a\u4e71\u308c\u305f\u8a66\u6599\u304b\u3089\u3082\uff0c\u4e71\u308c\u306e\u5f71\u97ff\u306e\u306a\u3044\u5f37\u5ea6\u3092\u3042\u308b\u7a0b\u5ea6\u63a8\u5b9a\u53ef\u80fd\u3067\u3042\u308b\u3053\u3068\u3082\u793a\u3055\u308c\u305f\u3002\nCore samplings were conducted in offshore Sakhalin Island, Sea of Okhotsk, and in Lake Baikal, Russia, where shallow gas hydrates existed. To examine the mechanical properties of sea and lake bottom sediments, the handy vane shear and cone penetration tests were performed for the core samples on board. To evaluate the sample disturbance due to the exsolution of dissolved gas during sampling, the relations between the concentration of dissolved gas in the pore water and the strength were also examined. Moreover, laboratory tests which simulate the stress relief from bringing the samples to the sea or lake surface were also performed. Test results showed that the strength of soils become lower with the increase in degree of gas saturation on both on-board and laboratory tests. 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