Stability evaluation and rockfall trajectory analysis of the Baimagou dangerous rock mass in Mingshan County of Sichuan Province
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摘要:
危岩体是指由结构面切割形成的在一定诱发因素下失稳破坏的岩体，其作为常见的自然地质灾害之一，严重影响山区人类生命财产安全。对危岩体的勘查、稳定性评价、风险评价是地质灾害预防的研究难题。受人类工程活动影响，名山县新店镇白马沟内存在多处危岩体。通过对国内外研究文献的查阅分析并结合白马沟危岩体的分布特征、发育特征、崩塌落石运动特性进行分析与研究，初步总结出了白垩系上统灌口组(K2g)危岩体的形成、分布规律及成灾机理，并对该区4个危岩体利用Rockfall 进行数值模拟计算，计算其运动速度及运动轨迹，计算岩石弹跳高度及距离等。为此类工程地质条件下的的危岩体稳定性评价及运动轨迹的分析提供参考，同时对于崩塌危岩体灾害预防与减灾技术研究有积极意义 。
Abstract:Dangerous rock mass refers to the rock mass that is cut by the structural plane and fails under certain inducing factors. As one of the common natural geological disasters, it seriously affects the safety of human life and property in mountainous areas. The exploration, stability evaluation and risk evaluation of dangerous rock mass are difficult problems in the research of geological disaster prevention. Affected by human engineering activities, there are many dangerous rock masses in Baimagou, Xindian Town, Mingshan County. Based on the analysis and Research on the distribution and development characteristics of collapse dangerous rock mass in baimagou, this paper preliminarily summarizes the formation, distribution law and disaster mechanism of dangerous rock mass in Guankou formation (K2g) of Upper Cretaceous system, and carries out numerical simulation calculation for four collapse dangerous rock bodies in this area by using Rockfall, calculates their movement speed and trajectory, and calculates the rock bounce height and distance, It provides a reference for the stability evaluation and motion trajectory analysis of dangerous rock mass under such engineering geological conditions.
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Key words:
- dangerous rock mass /
- structural plane /
- stability evaluation /
- Rockfall /
- path of particle
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表 1 危岩体稳定性定性评价统计表
Table 1. Statistical table for qualitative evaluation of stability of dangerous rock mass
编号 体积
/m3破坏
模式稳定性评价 天然工况 暴雨工况 地震工况 W2-1危岩体 250.8 坠落 基本稳定 欠稳定 欠稳定 W3-1危岩体 37.3 坠落 基本稳定 欠稳定 欠稳定 W4-1危岩体 270.3 坠落 基本稳定 欠稳定 欠稳定 W4-2危岩体 53.9 倾倒 基本稳定 欠稳定 欠稳定 
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表 2 勘查区岩石力学性质指标
Table 2. Mechanical property indexes of rocks in the exploration area
岩土名称 天然容重/
（kN·m−3）天然抗压
强度
/MPa抗拉强度
/MPa黏聚力
（饱和）
/MPa内摩擦角（饱和）
/（°）承载力特征值
/kPa基底摩擦系数 强风化泥质粉砂岩 22.0* 14.3* 0.20* 3.5* 35.0* 450 0.40 注：上述表中*根据地方经验取值。
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表 3 各危岩单体稳定性计算统计表
Table 3. Stability calculation statistics of each dangerous rock mass
编号 体积/m3 破坏模式 稳定系数 安全系数 稳定性评价 天然 暴雨 地震 天然 暴雨 地震 W2-1 250.8 坠落 1.333 1.198 1.191 1.4 基本稳定 欠稳定 欠稳定 W3-1 37.3 坠落 1.236 1.192 1.196 1.4 基本稳定 欠稳定 欠稳定 W4-1 270.3 坠落 1.336 1.192 1.193 1.4 基本稳定 欠稳定 欠稳定 W4-2 53.9 倾倒 3.326 1.256 1.192 1.3 稳定 欠稳定 欠稳定
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表 4 各危岩体坡段参数的取值
Table 4. Values of slope parameters of dangerous rock mass
危岩体
编号坡段岩性 法向阻尼
系数Rn切向阻尼
系数Rt滚动摩擦
系数滚动摩擦
角/（°）W2-1 强风化泥质粉砂岩 0.35 0.85 0.48 35 W3-1 强风化泥质粉砂岩 0.35 0.85 0.48 35 W4-1 强风化泥质粉砂岩 0.35 0.85 0.48 35 W4-2 强风化泥质粉砂岩 0.35 0.85 0.48 35
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表 5 各危岩体运动路径与弹跳高度、总动能、速度的关系表
Table 5. Relationship between movement path of each dangerous rock body and jumping height, total kinetic energy and speed
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