软弱结构面水流冲刷形成集中渗漏通道机制研究  

Mechanism Research on Concentrated Leakage Passage Formed by Water Flow Erosion in Weak Structure Plane

作　　者：叶合欣[1] 董明[2] 董海洲[3] 

机构地区：[1]广东省水利水电技术中心,广州510635 [2]广东省水利水电科学研究院,广州510610 [3]河海大学地球科学与工程学院,南京210098

出　　处：《防灾减灾工程学报》2011年第2期173-179,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(50809024)资助

摘　　要：软弱结构面塑性程度高、强度低,在地下水长期作用下,很易导致岩体产生变形、形成集中渗漏通道及渗透破坏。软弱结构面的渗透稳定性,一直是水利水电工程的重要工程地质及水文地质问题之一,目前对其渗透破坏机理的认识还存在不少尚未解决的问题。针对已有对基岩软弱结构形成集中渗漏通道研究的不足,本文在软弱结构面内讨论渗透变形问题,主要探讨了软弱结构面受水流冲刷发展的机制,以及土粒起动处于不同位置时的临界流速及相应隙宽。最后介绍了在适当地质等条件下,基岩软弱结构面可形成集中渗漏通道的实例。Weak structure plane is typically with high plasticity and low intensity, which provides possibility of bedrock deformation,causing concentrated leakage passage and eventually leading to seepage failure under the long-term effect of groundwater.The seepage stability of weak structure plane is one of the most important engineering and hydrogeological research topics.At present,there are still many unsolved problems about mechanism of the seepage failure.The research on concentrated leakage passage formed in weak structure is inadequate.Seepage deformation in weak structure plane was studied in this paper,focusing on developmental mechanism of leakage channels caused by water flow erosion and critical velocity of dust particles corresponding to their different starting locations and relative fissure width.A case was studied to indicate that the concentrated leakage passage can be formed in bedrock weak structure plane under proper geological conditions.

关 键 词：堤坝 软弱结构面 集中渗漏通道 渗透变形 

分 类 号：TV131.14[水利工程—水力学及河流动力学]