碎屑流堆积物粒度分布与运动特性的关系——以贵州纳雍普洒村崩塌为例  

Relationship between particle size distribution and movement characteristics of rock avalanche deposits: a case study of the Pusa village rock avalanche in Nayong of Guizhou

作　　者：彭双麒 许强[1] 郑光[1] 巨袁臻 周小棚 PENG Shuangqi;XU Qiang;ZHENG Guang;JU Yuanzhen;ZHOU Xiaopeng(State Key Laboratory of Geohazard Prevention and Geo-environment Protection,Chengdu University of Technology,Chengdu,Sichuan 610059,China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《水文地质工程地质》2018年第4期129-136,共8页Hydrogeology & Engineering Geology

基　　金：国家创新研究群体科学基金(41521002);国家自然科学基金重点项目(41630640);地质灾害防治与地质环境保护国家重点实验室自主研究课题(SKLGP2015Z023)

摘　　要：对碎屑流堆积物的研究能反应碎屑流动能的变化。文章在普洒村崩塌现场调查的基础上结合崩塌堆积体高分辨率数字地表模型(DSM),对崩塌碎屑流部分粒径进行统计分析,再结合谢德格尔公式估算崩塌碎屑流运动速度,对碎屑流运动过程进行初步分析,得到如下结论:(1)统计堆积体沿主滑方向的13个连续矩形区(A1~A13区)表面块石粒径,总结其规律为:越远离崩塌源区,小粒径含量越多,大粒径含量越少。(2)堆积物粒径和碎屑流运动动能有关,速度越大,其携带块石的能力越大,反之,块石含量越少。(3)根据块石堆积的不同特点,将堆积区域划分为初始堆积区、集中堆积区、平稳堆积区以及堆积减弱区。The study of rock avalanche deposits can reveal the changes in rock avalanche energy.Based on the survey of the collapse site in Pusa village,this paper combines the digital surface model(DSM)of the collapsible sedimentary body with the statistical analysis of the particle size of the collapsed rock avalanche to carry out a preliminary analysis of the rock avalanche movement process.By using the Scheidegger formula to estimate the velocity of the rock avalanche,we can draw the following conclusions.(1)Calculation the particle size of the blocks on the surface of 13 consecutive rectangular zones(A1~A13)along the main slip direction gets the rules as follows:the farther away from the collapse source area,the smaller the content of small particles,and the smaller the content of large particles.(2)The sediment particle size is related to the movement kinetic energy of rock avalanche.The greater the velocity,the greater its ability to carry rock masses.On the contrary,the rock mass content is less.(3)According to the different characteristics of the deposits,the accumulation area is divided into initial accumulation area,concentrated accumulation area,stable accumulation area and accumulation weakening area.

关 键 词：碎屑流 高分辨率数字地表模型 堆积体 粒度分布 运动特性 

分 类 号：P642.21[天文地球—工程地质学]