不同结构顺层岩质滑坡运动过程风险性的实验研究

    EXPERIMENTAL RESEARCH OF RISK PARAMETERS IN PROCESS OF BEDDING ROCK LANDSLIDE MOTION

    • 摘要: 顺层岩质滑坡是常见的斜坡灾害,此类滑坡的灾害强度与岩体结构、地形等因素密切相关,为此,在滑坡风险评价和灾害评估中考虑滑坡的组成结构具有重要的理论意义。首先,分析了影响顺层岩质滑坡运动过程的结构要素,并提出了滑坡的常见地质结构模型; 然后,通过物理模型实验测试了不同滑体结构、坡角和初始速度组合下,滑坡的运动过程,并分析了不同结构滑坡运动学参数的基本规律; 最后,总结了滑坡风险计算模型的主要参数,并探讨了不同结构顺层岩质滑坡在滑体内和堆积区风险参数的建议值。结果表明:(1)考虑地形、岩体结构和控制性滑面3个因素,顺层岩质滑坡可划分为类散体结构、层状结构和块状结构3大类结构,层状结构进一步分为3个亚类; (2)物理模型实验所模拟的7类结构滑体,主滑段的末速度、堆积段影响范围(L1)和冲击强度(1)表现为板状岩体(Ⅱ)块状岩体(Ⅳ)类散体(Ⅶ); (3)主滑段末速度:多层含未贯通节理块状岩体(Ⅴ)多层板状岩体(Ⅱ)多层块状岩体(Ⅳ), Ⅳ类岩体影响范围最大, Ⅱ类岩体的冲击力最大; (4)滑体内的易损性作用强度块状岩体滑坡(Ⅳ和Ⅴ)多层板状岩体(Ⅱ和Ⅲ)类散体滑坡(Ⅶ)单层板状岩体滑坡(Ⅰ)。堆积区后部的作用强度指标:(Ⅱ、Ⅲ和Ⅴ)ⅣⅠⅦ; 堆积区中前部的作用强度指标: ⅡⅤⅣⅢⅠ。

       

      Abstract: Bedding rock landslide is a common slope disaster. The disaster strength of landslide is closely related to rock mass structure and terrain. It has important theoretical significance to assess its risk taking into consideration of the structure of the landslide. Firstly, the structural factors to the effect motion of bedding rock landslide are analyzed. The geological structure model of landside is put forward. Then, the basic law of the different structure landslide kinematics parameter is analyzed. The motion process of the different landslides that have different sliding body structures, slope angles and initial velocities is tested by the physical model. Lastly, the risk parameters of different structure bedding landslides is put forward by summarizing the tested data and risk calculation model of landslides. It indicates that:(1)Bedding rock landslide can be divided into three structures, similar granular, layer and block structure. When considering terrain, rock mass structure, slip surface, and layer structure can be divided into three subcategory in further; (2)Seven types of landslide structures are simulated by physical model test. The results manifest the following. The values of the terminal velocity of the active slide(vt),the influence range(L1) and impact strength(1) for the layer rock(Ⅱ), the blocky rock(Ⅳ), and the similar granular rock(Ⅶ) are ranked the highest, the second and the third; (3)The values of vt of the multilayer blocky rock with joints(Ⅴ),the multilayer rock(Ⅱ), and the multilayer blocky rock(Ⅳ) are ranked the highest, the second and the third. The rock Ⅳ has the largest of L1. The rock Ⅱ has the largest of 1;(4)The vulnerability strength of slide body for the blocky rock(Ⅳ and Ⅴ),the multilayer rock(Ⅱ and Ⅲ),the similar granular landslide(Ⅶ), and the single layer rock(Ⅰ) are ranked the No.1 to No.4 respectively. The strength indices of the back in accumulation area for(Ⅱ、Ⅲ and Ⅴ),the Ⅳ, Ⅰand Ⅶ are ranked the highest to the lowest, respectively. The strength index values of the front in the accumulation area for Ⅱ, Ⅴ, Ⅳ, Ⅲ and Ⅰ are ranked the highest to the lowest, respectively.

       

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