| 位移-应力协同分析在新近纪软岩质滑坡监测中的应用——以陕西宝鸡市北坡滑坡为例 |
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| 关键词:rainfall landslides displacement-stress monitoring soft tock |
| 基金项目:中国地质科学院地质力学研究所科研项目(编号: 22);中国地质调查局项目(编号: DD20190717);国家自然科学基金项目(编号: 41402281) |
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| The Application of Displacement-stress Synergetic Analysis to Landslide Monitoring: A Case Study of Beipo Landslides in Baoji City,Shaanxi Province |
| Heavy rainfall always induces gradual deformation of landslides and eventually leads to large-scale sliding of landslides. Since 1955, more than ten large landslides have been induced by rainfall on the northern slope of the Weihe River in Baoji, Shaanxi Province. On September 19, 2011, extremely heavy rainfall occurred again in Baoji City, with total rainfall amount of 332 mm in 72 hours. Cracks and deformations occurred in Jindingsi landslide, Bojishan landslide and Gaojiaya landslides in Baoji City. For the purpose of judging the stability of these three landslides, real-time monitoring of rainfall, groundwater level, pore water pressure, stress and displacement of landslides was carried out from 2012 to 2015. Their frequency, intensity and cumulative variation laws were analyzed, and the displacement expansion model of landslides was put forward. Data analysis showed that the frequency and intensity of physical parameters such as rainfall, groundwater level, pore water pressure, displacement and stress were not synchronized. The rainfall, groundwater level and pore water pressure showed seasonal and periodic changes. The difference is that the displacement and stress of the landslide had a cumulative effect. The deformation of the slip zone in Bojishan landslide controlled the deformation of the sliding body, and its displacement was gradually increased with two stages of creep and rapid slip. Rainfall would trigger accelerated changes in the physical quantity of landslide. The fluctuation range of groundwater level was 0.27~1 m, the variation range of pore water pressure was 10 kPa, and the variation range of horizontal stress in the shallow layer of landslide body was 5.6 kPa. In the process of judging whether rainfall can induce the rapid slide of landslide, it is necessary not only to monitor and analyze the periodic variation regularity and strength of groundwater level, pore water pressure, stress and displacement in the landslide body, but also to test and analyze the material composition and mechanical properties of sliding-controlled strata. |
| XIN Peng,HU Le,WANG Tao,FAN Li,WU Shu-ren,SHI Ju-song.2020.The Application of Displacement-stress Synergetic Analysis to Landslide Monitoring: A Case Study of Beipo Landslides in Baoji City,Shaanxi Province[J].Acta Geoscientica Sinica,41(1):37-48. |
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