降雨强度对松散堆积土斜坡破坏的模型试验研究
|
摘要
通过在室内构建泥石流源区松散堆积土体斜坡模型,采用三种不同降雨强度对其稳定性进行研究。得出了不同降雨强度下斜坡土体流失规律与斜坡的失稳方式。结果表明:在低雨强(26mm/h)作用下,松散斜坡的土体流失量最少,并以坡面侵蚀为主;在中、高雨强(51mm/h,68mm/h)作用下,首先表现为坡面侵蚀和沟道侵蚀,进而是大规模土体流滑破坏,在土体累积流失量与时间曲线上有突变点;在高雨强作用下,形成了阵性泥石流。
There are indoor artificial rainfall experiments in self-designed model under different rainfall intensity(26 mm/h,51 mm/h,68 mm/h)to study the mechanism of loose deposit slope stability in the debris region.The results showed that the soil loss under low rainfall intensities of 26mm/h is least,and the failure mode of slope is slope surface erosion;but under high rainfall intensities of 51 and 68mm/h,both failure modes of slope are slope surface erosion and gully erosion,and flowslide is the main failure mode,which are correspond to the mutation point of curve of cumulative soil loss vs time.Intermittent debris flow is formed under high rainfall intensities of 68 mm/h.
There are indoor artificial rainfall experiments in self-designed model under different rainfall intensity(26 mm/h,51 mm/h,68 mm/h)to study the mechanism of loose deposit slope stability in the debris region.The results showed that the soil loss under low rainfall intensities of 26mm/h is least,and the failure mode of slope is slope surface erosion;but under high rainfall intensities of 51 and 68mm/h,both failure modes of slope are slope surface erosion and gully erosion,and flowslide is the main failure mode,which are correspond to the mutation point of curve of cumulative soil loss vs time.Intermittent debris flow is formed under high rainfall intensities of 68 mm/h.
引文
[1]余斌,杨永红,苏永超,等.甘肃省舟曲8-7特大泥石流调查研究[J].工程地质学报,2010,18(4)
[2]崔鹏,庄建琦,陈兴长,等.汶川地震区震后泥石流活动特征与防治对策[J].四川大学学报(工程科学版),2010,42(5)
[3]许强.四川省8-13特大泥石流灾害特点、成因与启示[J].工程地质学报,2010,18(4)
[4]殷跃平,朱继良,杨胜元.贵州关岭大寨高速远程滑坡～碎屑流研究[J].工程地质学报,2010,18(4)
[5]陈中学,汪稔,胡明鉴,等.黏土颗粒含量对蒋家沟泥石流启动影响分析[J].岩土力学,2005,26(11)
[6]胡明鉴,汪稔,孟庆山,等.坡面松散砾石土侵蚀过程及其特征研究[J].岩土力学,2005,26(11)
[7]吴积善,康志成,田连权,等.云南蒋家沟泥石流观测研究[M].北京:科学出版社,1980
[8]魏厚振,汪稔,胡明鉴,等.蒋家沟砾石土不同含水率砾石土直剪强度特征[J].水土保持学报,2008,22(5)
[9]王志兵,汪稔,胡明鉴,等.蒋家沟砾石土的特性及其对斜坡失稳的意义[J].岩土力学,2010,31(增刊2)
[2]崔鹏,庄建琦,陈兴长,等.汶川地震区震后泥石流活动特征与防治对策[J].四川大学学报(工程科学版),2010,42(5)
[3]许强.四川省8-13特大泥石流灾害特点、成因与启示[J].工程地质学报,2010,18(4)
[4]殷跃平,朱继良,杨胜元.贵州关岭大寨高速远程滑坡～碎屑流研究[J].工程地质学报,2010,18(4)
[5]陈中学,汪稔,胡明鉴,等.黏土颗粒含量对蒋家沟泥石流启动影响分析[J].岩土力学,2005,26(11)
[6]胡明鉴,汪稔,孟庆山,等.坡面松散砾石土侵蚀过程及其特征研究[J].岩土力学,2005,26(11)
[7]吴积善,康志成,田连权,等.云南蒋家沟泥石流观测研究[M].北京:科学出版社,1980
[8]魏厚振,汪稔,胡明鉴,等.蒋家沟砾石土不同含水率砾石土直剪强度特征[J].水土保持学报,2008,22(5)
[9]王志兵,汪稔,胡明鉴,等.蒋家沟砾石土的特性及其对斜坡失稳的意义[J].岩土力学,2010,31(增刊2)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心