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震区砾石土泥石流起动临界状态与力学性状
Alternative TitleThe Mechanical Property of Gravel Soil in Seismic Area and Its Critical State in Initiating Debris Flow
廖丽萍1,2,3; 朱颖彦4; 杨志全5; 杨云川1,2,3; 胡进6; 邹代华7; 罗晓宏8
Corresponding Author朱颖彦
2017
Source Publication山地学报
ISSN1008-2786
Volume35Issue:4Pages:506-516
Other Abstract

虽然汶川震区的松散砾石土历经近10年的自然固结过程,坡面植被恢复良好,但灾后持续活跃的泥石流等地质灾害告诉我们,了解这类因地震产生的砾石土的力学性状,仍然是理解灾区地质灾害肆虐的最重要的方面之一。本文以汶川县映秀镇牛圈沟泥石流源区的砾石土为研究对象,采用人工水槽模型试验与三轴测试,观察泥石流起动时砾石土的宏细观现象,分析粗细颗粒含量变化对砾石土干密度的影响,并从临界状态土力学角度,探讨了泥石流起动时砾石土的力学性状,提出砾石土临界状态数学表达式。结果表明:(1)泥石流起动时间、模式与初始干密度密切相关,其过程伴随着干密度和孔隙比的变化;(2)细颗粒迁移与粗细颗粒含量调整引起土体内部细观结构重组是干密度与孔隙比变化的主要原因;(3)相同级配的砾石土在等同围压条件下排水剪切,会近似达到一个临界孔隙比;(4)砾石土力学性状可根据其状态参数(e,p’)与e_c-p’平面临界状态线的相对位置来判断;(5)砾石土边坡在降雨淋溶下失稳形成泥石流,坡体内同时存在剪胀与剪缩两种力学性状,且以剪胀为主。本文研究成果一方面能对泥石流起动机理的理论体系进行完善与补充,另一方面能为震区砾石土泥石流的防治预警预报提供初步依据。

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Although gravel soils generated by seismic shaking in Wenchuan earthquake area have subjected to natural consolidation process for nearly ten years,geological hazards,such as slope failures with ensuing debris flows,frequently are haunting the area. To understand the nature of geohazard initiation,in this paper,artificial flume experiments and triaxial tests were used to make close observation on gravel soil samples,which were collected at Niujuan valley,Yingxiu Town of Wenchuan County,Sichuan Province,China. Based on the mechanical property analysis of gravel soil samples,some results relevant to the micro-macro property,action of coarse-fine particles content on dry density,and critical state of gravel soils in the process of motivating debris flow were confirmed: ( 1) The timing and patterns of debris flow initiations were closely related to their initial dry densities,and initiation processes were accompanied with a variation of dry density and void ratio; ( 2 ) Fine particle migration in soil and coarse-fine particle content rearrangement contributed to the internal micro structure
reorganization,which was supposed to be the main reason for variation of dry density and void ratio; ( 3) Gravel soils with unchanged grain compositions,if under the same hydrostatic compression,they approached to an identical critical void ratio theshold to fail; ( 4) The mechanical state of certain sort of gravel soil can be identified by its relative position between state parameter ( e,p') and ec - p' planar critical state line; ( 5) Gravel soil slope failed and then evolved into debris flow under lasting rainfall leaching,while in gravel slope there co-existed soil dilatation and contraction,but the dilatation was dominant. Above research findings not only could be used to interpret debris flow initiation but also would provide an insight for debris flow warning forecast of gravel slope in seismic area.

Keyword汶川震区 砾石土 泥石流 临界状态 力学性状
Subject AreaP642.23
DOI10.16089/j.cnki.1008-2786.000248
Indexed ByCSCD ; 北大中文核心
Language中文
CSCD IDCSCD:6066143
Funding Organization国家自然科学基金项目(41071058、41402272、51609041) ; 广西科技厅基金(2015 GXNSFBA139222) ; 广西防灾减灾与工程安全重点实验室项目(2016 ZDX09)
Citation statistics
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/19116
Collection管理与支撑系统
山地灾害与地表过程重点实验室
Affiliation1.广西大学土木建筑工程学院
2.工程防灾与结构安全教育部重点实验室
3.广西防灾减灾与工程安全重点实验室
4.中国科学院成都山地灾害与环境研究所
5.昆明理工大学国土资源工程学院
6.苏州市伟基基础工程有限公司
7.Department of Civiland Resource Engineering,Dalhousie University
8.湖北交通职业技术学院
Recommended Citation
GB/T 7714
廖丽萍,朱颖彦,杨志全,等. 震区砾石土泥石流起动临界状态与力学性状[J]. 山地学报,2017,35(4):506-516.
APA 廖丽萍.,朱颖彦.,杨志全.,杨云川.,胡进.,...&罗晓宏.(2017).震区砾石土泥石流起动临界状态与力学性状.山地学报,35(4),506-516.
MLA 廖丽萍,et al."震区砾石土泥石流起动临界状态与力学性状".山地学报 35.4(2017):506-516.
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