| 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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| 引用本文：辛鹏,胡乐,王涛,范力,吴树仁,石菊松.2020.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[J].地球学报,41(1):37-48. |
| DOI：10.3975/cagsb.2019.040801 |
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| 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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| 中文摘要:强降雨可诱发新近纪软岩质滑坡滑移变形。1955年至今, 降雨在陕西宝鸡诱发超过十起大型滑坡灾害。2011年9月19日, 宝鸡市区72 h内的降雨量达到332 mm, 北坡金鼎寺、簸箕山与高家崖滑坡出现裂缝, 威胁市区居民安全。为分析滑坡的变形机制与降雨触发的滑体内地下水位的波动关系, 2012—2015年, 开展了降雨量、地下水位、孔隙水压力、滑坡应力与位移等物理量的实时监测, 统计分析了它们的频率、活动强度及累积变化规律, 提出了滑坡的位移扩展模型。研究显示: (1)地下水的活动会影响新近纪软岩质滑坡的变形, 但降雨量、地下水位、孔隙水压力、滑坡体应力与位移等物理量变化机制有差异, 地下水位、孔隙水压力呈周期性变化, 滑坡体的应力、位移的变化具有累积效应; (2)宝鸡市北坡滑坡运动变形具有蠕变、快速滑移两个阶段。降雨会触发的滑坡体各物理量出现加速变化, 地下水位波动幅度为0.27~1 m, 孔隙水压力的变化幅度为10 kPa, 滑体浅层的水平应力变化幅度为5.6 kPa; (3)在判断降雨能否诱发滑坡快速滑移过程中, 既需分析滑体应力、位移变化的累积效应, 又需分析新近纪软岩质滑带的摩擦破坏机制。 |
| 中文关键词:降雨 滑坡 监测 位移-应力 软岩 |
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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 |
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| Abstract: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. |
| keywords:rainfall landslides displacement-stress monitoring soft tock |
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