黏性泥石流沟床冲刷深度研究  

Study of gully bed erosion depth of viscous debris flow

作　　者：赵彦波[1,2,3] 游勇[1,2] 柳金峰[1,2] 陈兴长[4] 

机构地区：[1]中国科学院山地灾害与地表过程重点实验室,成都610041 [2]中国科学院水利部成都山地灾害与环境研究所,成都610041 [3]中国科学院大学,北京100049 [4]西南科技大学环境与资源学院,四川绵阳621010

出　　处：《岩土力学》2014年第6期1751-1755,共5页Rock and Soil Mechanics

基　　金：中国科学院重点部署项目(No.KZZD-EW-05-01-04);国家科技支撑计划课题资助(No.2012BAC06B02)

摘　　要：沟床冲刷深度是泥石流灾害防治工程设计最重要的参数之一,但到目前为止,关于黏性泥石流沟床冲刷的研究较少,沟床冲刷深度还没有权威可信的计算方法,是泥石流防治工程设计急需解决的技术问题。详细分析了黏性泥石流及可能冲刷沟床运动过程中受力情况,推导出黏性泥石流沟床最大冲刷深度计算公式。公式表明黏性泥石流沟床冲刷深度随泥石流泥深、泥石流重度和沟床纵比降及沟床堆积土体黏性的增大而增大,随沟床堆积土体内摩擦角的增大而减小。与现有计算方法相比,公式基于严格理论推导,计算结果更为精确,可用于计算已发生泥石流地区的不同频率的泥石流的冲刷深度,并举例说明了计算公式的实用价值,其结果为泥石流防治工程设计提供技术支撑。Gully bed erosion depth is one of the most important parameters for design of debris flow control works. So far, there arefew researches on gully bed erosion depth and there are no good methods for calculating the gully bed erosion depth. How tocalculate the gully bed erosion depth is also a technical problem which urgently needs to be solved for debris flow preventingengineering design. The driving forces of viscous debris flow and potential resistance which may take part in the motion are analyzed.And then the calculation formula of the maximum erosion depth is obtained. The formula shows that the erosion depth of gully bedincreases with the increasing of depth and density of debris flow, longitudinal slope of gully bed and viscosity of gully bed materials,while decreases with the increasing of internal frictional angle of gully bed materials. Comparing with the existing calculationmethods, the formula is based on a strict theoretical derivation, the calculation result is more accurate and can be used to calculate theerosion depth in the occurrence of debris flow area for different frequencies, and provides a technical support for the design ofviscous debris flow control works. The practical value of the calculation formula is illustrated.

关 键 词：黏性泥石流 沟床 冲刷深度 计算方法 

分 类 号：TV144[水利工程—水力学及河流动力学]