| Liu Jie,Liu Lejun,Li Ping,Gao Shan,Gao Wei,Xu Yuanqin. 2019. Geotechnical properties and stability of the submarine canyon in the northern South China Sea. Acta Oceanologica Sinica, 38(11):91－98 |
| Geotechnical properties and stability of the submarine canyon in the northern South China Sea |
| 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 |
| Received:November 12, 2018 |
| DOI：10.1007/s13131-019-1501-8 |
| Key words:shear strength|slope stability analysis|submarine canyons|northern South China Sea |
| 中文关键词: 抗剪强度 边坡稳定性 海底峡谷 南海北部 |
| 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. |
| Author Name | Affiliation | E-mail | | Liu Jie | 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, China | liping@fio.org.cn | | Liu Lejun | Marine Engineering Environment & Geomatic Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Li Ping | 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, China | | | Gao Shan | 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, China | | | Gao Wei | 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, China | | | Xu Yuanqin | 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, China | |
|
| Hits: 850 |
| Download times: 595 |
| 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. |
| 中文摘要: |
| 南海北部陆坡是海底滑坡灾害的易发区，尤其是在海底峡谷区，海底滑坡仍存在发生的可能，本文利用在南海北部荔湾深水陆坡区获取的柱状沉积物样品，对研究区沉积体工程力学性质的分布特征进行探讨，并对区域沉积物的稳定性进行评价。结果表明：钻孔沉积物抗剪强度随埋深的增加而逐渐增大，二者具有较好的线性相关关系，峡谷区头部和中部沉积物抗剪强度随埋深的变化率明显大于峡谷区底部；对于相同埋深沉积物而言，从峡谷区头部到峡谷区底部，沉积物的抗剪强度呈先逐渐增大后逐渐变小的趋势，且与钻孔所在位置的坡度没有明显的相关关系；静力条件下，峡谷区中部沉积物的临界平衡坡度角在10-12°之间，峡谷区头部和底部处的临界坡度角在7°左右；根据区域沉积物稳定性分析结果，潜在的滑坡危险区主要分布在峡谷两侧谷壁坡度较大的位置，且呈明显的点状或小范围条带状分布。 |
|
HTML
View Full Text
View/Add Comment Download reader |
| Close |
|
|
|
