Stability analysis and motion prediction of dangerous rockmasses along the slope at Kongyu in Kangding Country,Sicuan
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摘要: 危岩带位于乡政府后山斜坡,裂隙发育、岩体成块状,完整性较差。受地震和强降雨影响,局部危岩脱落形成危岩单体,沿斜坡滚落至坡脚,严重威胁坡脚乡政府所在地居民生命财产安全。文章对危岩进行了定性和定量的稳定性分析,综合判断各危岩体的稳定性情况。利用离散元软件UDEC建立模型,在裂隙水压力不同的情况下进行数值模拟,分析其稳定性情况。根据现场具体情况,选择典型危岩体,对其运动特征进行理论计算分析,利用Rockfall软件进行模拟,其结果对治理工程设计具有一定的指导意义。Abstract: The dangerous rock belt of Cunda River is located on the back mountain slope of the township government, with developed fissures and massive rock mass and poor integrity. Affected by the earthquake and heavy rainfall, partial dangerous rocks fell off to form dangerous rock monoliths, which rolled down the slope to the foot of the slope, seriously threatening the life and property safety of the residents in the location of Pojiao township government. In this paper, qualitative and quantitative stability analysis of the dangerous rock mass is carried out to comprehensively judge the stability of each dangerous rock mass. The discrete element software UDEC is used to establish a model, conduct numerical simulation under different fracture water pressures, and analyze its stability. According to the specific situation of the site, the typical dangerous rock body is selected, its motion characteristics are theoretically calculated and analyzed, and simulated by Rockfall software. The results have certain guiding significance for the design of governance engineering.
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Key words:
- unstable rock /
- stability /
- UDEC /
- movement characteristics /
- Rockfall
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图 5 倾倒式危岩计算模型(后缘有陡倾裂隙)[12]
Figure 5. Dumping dangerous rock calculation model (trailing edge steep fissure)
表 1 结构面抗剪强度指标标准值
滑坡分期 滑源区
长度/m加速区
长度/m减速堆积
区/m滑动距离
/m平均速度
/(m·s−1)最大速度
/(m·s−1)黄土泥
岩滑坡99 221 115 336 4.2 9.3 第一次黄土
碎屑流137 230 122 342 5.71 15.0 第二次黄土
碎屑流186 290 335 625 6.01 18.6 黄土泥流 155 277 184 461 10.7 13.2 表 2 通道2#恢复系数表
Table 2. Recovery factor table of the channel 2 #
位置 法向恢复系数Rn 切向恢复系数Rt 动摩擦系数k 均值 标准偏差 均值 标准偏差 均值 标准偏差 AB 0.40 0.04 0.89 0.04 33.0 2 BC 0.38 0.04 0.88 0.04 30.0 2 CD 0.38 0.04 0.88 0.04 30.0 2 DE 0.40 0.04 0.80 0.04 31.0 2 EF 0.40 0.04 0.80 0.04 31.0 2 FG 0.40 0.04 0.80 0.04 31.0 2 GH 0.35 0.04 0.82 0.04 32.0 2 HI 0.36 0.04 0.82 0.04 31.0 2 IJ 0.38 0.04 0.88 0.04 33.0 2 JK 0.35 0.04 0.82 0.04 28.0 2 KL 0.40 0.04 0.89 0.04 33.0 2 LM 0.32 0.04 0.82 0.04 30.0 2 MN 0.32 0.04 0.82 0.04 30.0 2 NO 0.40 0.04 0.90 0.04 0 0 -
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