摘要
为探究震后及复杂地质山区土石混合体崩塌运动规律,采用离散元法分析崩塌运动过程,研究含石量和坡度变化下崩塌体崩塌运动速度、最远运距、冲击力及运动形式。结果表明:同一坡度下,含石量越大崩塌速度峰值越大,其运动时间越短;相同含石量,随坡度的增大速度峰值越大其运动时间逐渐缩短;细颗粒和块石的最大水平运距与含石量和坡度变化成正相关;含石量变化对崩塌体的冲击力影响较小,坡度变化对崩塌体的冲击力影响较大,其中坡度65°各含石量崩塌体出现滑动冲击阶段、动态冲击阶段、稳定堆积阶段;崩塌体崩塌演化经历了变形滑动、高速滑滚、准静态堆积三个运动阶段,运动形式以滑动为主。研究结果将为土石混合体崩塌灾害预测与治理提供参考。
In order to explore the law of the collapse movement in the soil-rock accumulation in mountainous area after earthquake,the discrete element numerical simulation analysis was carried out,and the average collapse velocity,the farest transport distance,the impact force and the movement form of the collapse body were studied.The results show that,the larger the rock content is,the greater the peak value of the average landslide velocity is,while the slope is constant,and the shorter the movement time is while the rock content is constant.With the same rock content,the peak value of average velocity increases with the increase of slope,whereas the movement time decreases gradually.The maximum horizontal transport distance of fine particles and blocks is positively correlated with the change of rock content and slope.The change of rock content has little effect on the impact force of the collapse,while the slope has great effect on the impact force of the collapse.The impact force of collapse with a slope of 65°and different rock contents presents three stages including sliding impact stage,dynamic impact stage and stable accumulation stage.The evolution of the accumulation body has undergone three motion stages including deformation sliding stage,high speed roller stage and quasi-static accumulation stage.Sliding is the main form of motion.The results of this study will provide reference for the prediction and management of landslide disaster.
作者
成浩
韩培锋
苏有文
CHENG Hao;HAN Peifeng;SU Youwen(School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China;Research Center on Mountain Torrent and Geologic Disaster Prevention, Ministry of Water Resources, Wuhan, Hubei 430010, China)
出处
《中国地质灾害与防治学报》
CSCD
2020年第4期11-23,共13页
The Chinese Journal of Geological Hazard and Control
基金
国家重点研发计划项目(2018YFC1505401)
水利部山洪地质灾害防治工程技术研究中心开放基金(CKWV2019759/KY)
国家自然科学基金资助项目(41877524,41971214)
四川省科技厅重点研发项目(2018SZ0345)
住房和城乡建设部科技计划(2018-K9-049,2018-K9-059)
西南科技大学研究生创新基金(19ycx0087)。
关键词
土石混合体
崩塌运动
平均速度
运距比
soil-rock mixed accumulation
collapse movement
the average velocity
the distance ratio
