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南海北部陆坡峡谷区海底沉积物工程地质特征及区域稳定性评价
引用本文:刘杰,刘乐军,李萍,高珊,高伟,徐元芹.南海北部陆坡峡谷区海底沉积物工程地质特征及区域稳定性评价[J].海洋学报(英文版),2019,38(11):91-98.
作者姓名:刘杰  刘乐军  李萍  高珊  高伟  徐元芹
作者单位:自然资源部第一海洋研究所 海洋沉积与环境地质国家海洋局重点实验室, 青岛266061;青岛海洋科学与技术国家实验室 海洋地质过程与环境功能实验室, 青岛266061,自然资源部第一海洋研究所 海洋工程与测绘研究中心, 青岛266061,自然资源部第一海洋研究所 海洋沉积与环境地质国家海洋局重点实验室, 青岛266061;青岛海洋科学与技术国家实验室 海洋地质过程与环境功能实验室, 青岛266061,自然资源部第一海洋研究所 海洋沉积与环境地质国家海洋局重点实验室, 青岛266061;青岛海洋科学与技术国家实验室 海洋地质过程与环境功能实验室, 青岛266061,自然资源部第一海洋研究所 海洋沉积与环境地质国家海洋局重点实验室, 青岛266061;青岛海洋科学与技术国家实验室 海洋地质过程与环境功能实验室, 青岛266061,自然资源部第一海洋研究所 海洋沉积与环境地质国家海洋局重点实验室, 青岛266061;青岛海洋科学与技术国家实验室 海洋地质过程与环境功能实验室, 青岛266061
基金项目:The National Natural Science Foundation of China under contract No. 41706065; the National Program on Global Change and Air-Sea Interaction of China under contract No. GASI-GEOGE-05; the Special Fund of Chinese Central Government for Basic Scientific Research Operations in Commonweal Research Institutes under contract No. 2015G08; the NSFC-Shandong Joint Fund for Marine Science Research Centers of China under contract No. U1606401.
摘    要:The upper part of the continental slope in the northern South China Sea is prone to submarine landslide disasters,especially in submarine canyons. This work studies borehole sediments, discusses geotechnical properties of sediments, and evaluates sediment stability in the study area. The results show that sediment shear strength increases with increasing depth, with good linear correlation. Variations in shear strength of sediments with burial depth have a significantly greater rate of change in the canyon head and middle part than those in the canyon bottom. For sediments at the same burial depth, shear strength gradually increased and then decreased from the head to the bottom of the canyon, and has no obvious correlation with the slope angle of the sampling site. Under static conditions, the critical equilibrium slope angle of the sediments in the middle part of the canyon is 10° to 12°, and the critical slope angle in the head and the bottom of the canyon is 7°. The results indicate that potential landslide hazard areas are mainly distributed in distinct spots or narrow strips on the canyon walls where there are high slope angles.

关 键 词:抗剪强度  边坡稳定性  海底峡谷  南海北部
收稿时间:2018/11/12 0:00:00

Geotechnical properties and stability of the submarine canyon in the northern South China Sea
Liu Jie,Liu Lejun,Li Ping,Gao Shan,Gao Wei and Xu Yuanqin.Geotechnical properties and stability of the submarine canyon in the northern South China Sea[J].Acta Oceanologica Sinica,2019,38(11):91-98.
Authors:Liu Jie  Liu Lejun  Li Ping  Gao Shan  Gao Wei and Xu Yuanqin
Institution:1.Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China;Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China2.Marine Engineering Environment & Geomatic Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
Abstract:The upper part of the continental slope in the northern South China Sea is prone to submarine landslide disasters, especially in submarine canyons. This work studies borehole sediments, discusses geotechnical properties of sediments, and evaluates sediment stability in the study area. The results show that sediment shear strength increases with increasing depth, with good linear correlation. Variations in shear strength of sediments with burial depth have a significantly greater rate of change in the canyon head and middle part than those in the canyon bottom. For sediments at the same burial depth, shear strength gradually increased and then decreased from the head to the bottom of the canyon, and has no obvious correlation with the slope angle of the sampling site. Under static conditions, the critical equilibrium slope angle of the sediments in the middle part of the canyon is 10° to 12°, and the critical slope angle in the head and the bottom of the canyon is 7°. The results indicate that potential landslide hazard areas are mainly distributed in distinct spots or narrow strips on the canyon walls where there are high slope angles.
Keywords:shear strength|slope stability analysis|submarine canyons|northern South China Sea
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