| 青海西宁—民和新近纪泥岩盆地菜子沟大型平推式滑坡形成机制研究 |
| |
| 关键词:Xining–Minhe Neogene mudstone basin translational landslide forming mechanism |
| 基金项目:国家自然基金项目(编号: 41402281; 41572313);中国地质调查局项目(编号: 1212011220144) |
|
| 摘要点击次数: 2569 |
| 全文下载次数: 1720 |
| 摘要: |
| A Study of the Formation Mechanism of Caizigou Large-scale Translational Gliding Landslide in Neogene Mudstone Basin of Xining–Minhe, Qinghai Province |
| Translational sliding is one of the major movement types of large landslide in Xining–Minhe Basin of Qinghai Province. The on-going deformation of the large landslide at Caizigou, Huzhu County, Qinghai is threatening the lives of over 350 villagers with its relatively high risk of disasters. In this paper, the authors systematically analyzed the material composition, hydraulic characteristics and mechanical property of the strata of the gliding mass, and discussed the coordinated changing process between the Neogene mudstone structure and mechanical process to further explain the translational movement mechanism of the landslide. Some preliminary conclusions have been reached: (1) Gulang earthquake triggered the first translation of the slide against a weak layer of 25 cm thickness. The recent deformation was influenced both by infiltration of rain water during the flood season and the earthquake. The flatly inclined Neogene mudstone served as the control stratum of Caizigou landslide. (2) The Neogene mudstone of Xining Basin is clay rock with a clay content between 21.84% and 51.44%. The formation of the sliding belt resulted from shear localization, whose gradual expansion was controlled by substance structure, stress environment and mechanical response mechanism. The sliding belt tended to expand at the positions with higher content of clay, lower content of calcium carbonate and less cementing force, where the clay content is between 63% and 68%, the calcium carbonate content is between 5.27% and 4.12%, and the angle of internal friction is 6.8°. (3) Caizigou landslide is located in an arid area with seldom extreme heavy rainfall, so the earthquake and underground water infiltration and hydrolysis seem to be the major contributors for the present creep deformation, and this process is likely to continue. |
| XIN Peng,WANG Tao,WU Shu-ren.2018.A Study of the Formation Mechanism of Caizigou Large-scale Translational Gliding Landslide in Neogene Mudstone Basin of Xining–Minhe, Qinghai Province[J].Acta Geoscientica Sinica,39(3):342-350. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|