长江流域资源与环境 >> 2011, Vol. 20 >> Issue (09): 1149-.

• 自然灾害 • 上一篇    

泥石流暴发频率与其形成区块石粒径的关系

韩林,余斌|鲁科   

  1. (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;2.黑龙江省大庆市第九采油厂规划设计研究所|黑龙江 大庆 163853;3.四川省地质工程勘察院|四川 成都 610072
  • 出版日期:2011-09-20

RELATIONSHIP OF FREQUENCY OF DEBRIS FLOWS AND THE PARTICLE SIZE IN THE CHANNEL

HAN Lin1,2, YU Bin1, LU Ke1,3   

  1. (1.State Key Laboratory of Geohazards Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China;2.Planning and Design Institute of No. 9 Oil Extraction Factory of Daqing,Heilongjiang Province,Daqing 163853,China;3.Sichuan Institute of Geological Engineering Investigation,Chengdu 610072,China
  • Online:2011-09-20

摘要:

泥石流是山区常见的地质灾害之一,重大的泥石流灾害往往是由低频率泥石流造成的。通过对四川省西部地区17条泥石流沟的野外实地考察,测量了泥石流沟道内不同位置的块石粒径,研究了泥石流形成区、堆积区粗大块石粒径与泥石流暴发频率之间的关系。通过统计调查研究,得出坚硬岩石地区的块石粒径较大,泥石流暴发频率较低的结论,并初步给出由块石岩性、粒径来判定泥石流暴发频率的方法。用块石岩性和块石的平均粒径推测该泥石流沟的暴发频率,在低频泥石流的判断上简单可行,较为实用:可以通过查询地质图、判断主要岩性、对块石粒径赋值、选取影响因素进行修正、判定泥石流暴发频率。为深入研究低频率泥石流的形成机理提供了基础数据,为有效地预测和防治低频率泥石流提供了依据

Abstract:

Debris flow is one of geological disasters in Mountains. Significant damages and losses were often caused by low frequency debris flow.In western region of Sichuan Province 17 debris flow gullies were investigated and particle sizes were measured in the catchments of debris flows.The relationship between coarse particles size and the frequency of debris flows was studied.From the analysis of the characteristics of rock,the coarse particle size and the frequency of debris flows, the conclusions were obtained:(1) the coarse particle size in the formation area is almost the same as the coarse particle size in the deposition area of debris flow catchment. So the coarse particle size in the formation area can be replaced by the coarse particle size in the deposition area;(2) The mean size of coarse particle in middle and high frequency debris flow gullies is less or equal to 20 cm,and the mean size of coarse particle in low and extremely low frequency debris flow gullies is more or equal to 25 cm;(3) The harder rock, the larger coarse particle size is, and the lower frequency of debris flow is;(4) The frequency of debris flow was primarily determined by the characteristics of rock and the size of coarse particles. It is easily and useful to predict the frequency of debris flow by use the characteristics of rock and the coarse particle size in the low frequency debris flow gully:referring to the geological map,judgment the main characteristics of rock,assignment the size of coarse particle,choosing the effected factors,frequency of debris flow could be determined.These works could help to understand and predict the low frequency debris flows

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