
第30卷第3期 2018年6月
浙江水利水电学院学报
J. Zhejiang Univ of Wat. Res & Electric Pow.
D0I: 10.3969/j. issn.2095-7092.2018.03.007
双层堤基渗流变形特征分析及管涌防治黄旭,范尧,蔡家宏刘猛宋海波王俊鹏王其超
Vol.30No.3 Jun.2018
(1.山东省水利勘测设计院,山东济南250013;2.南水北调东线山东干线有限责任公司,山东济南250014)
摘要:道过对双层堤基地下水渗流条件及变形特征的探讨分析,得出双层提基地层岩性在下伏层细颗粒含量较多的时候,上覆粘性土层在一定条件下无法承受短时间内逐渐增大的地下水水压力时,粘性土层薄弱处将被高压水流顶穿发生管涌,下伏层中细颗粒不断地被地下水流带出土体,致使粘性土层产生渗透变形破坏.在初步分析了
双层堤基渗流变形特征分析的基础上,本文初步分析及探讨管涌险情的探别,并提出了合理的防治措施关键词:双层堤基;水文地质结构;渗流变形;管涌
中图分类号:TV139.16
文献标志码:A
文章编号:1008536X(2018)03-0035-04
AnalysisofSeepageDeformationCharacteristicsofDoubleLayerDyke
FoundationandPipingPrevention
HUANG Xu', FAN Yao', CAI Jia-hong”, LIU Meng”, SONG Hai-bo',WANG Jun-peng",WANG Qi-chao
(1. Shandong Survey and Design Institute of Water Conservancy , Jinan 250013, China :
2. South-to-North Water Diversion Route Eastern Shandong CO. , LTD. , Jinan 250014, China)
Abstract : Through the discussion and analysis of the seepage condition and deformation characteristics of underground water in the double-layer dike foundation it is concluded that the lithology of the double -layer embankment foundation is higher when the content of fine particles in the underlying bed is higher . When the overlying clay layer can not bear the pressure of groundwater water gradually increasing in a short period of time , the weak part of the viscous soil layer will be piped through by high pressure water flow , and the fine particles in the underlying layer will be continuously carried out by the groundwater flow out of the soil. Causes the clay soil to produce the seepage deformation destruction . On the hasis of pre-liminary analysis of seepage deformation characteristics of double -ayer embankment foundation , this paper preliminarily an-
alyzes and probes into the exploration of piping danger situation , and puts forward reasonable prevention measures . Key words : double layer dyke foundation ; hydrogeologic structure ; percolation and deformation ; piping erosion
水利工程构筑物双层堤基,是指堤基上覆地层由弱透水性的粘性土和透水性较强的下伏砂砾石组成的一种上细下粗的地质体,其具有明显的二元架构体系,该情况地质条件堤基的渗透破坏类型一般包括:泡泉、沙沸、土层隆起等,也就是通常所称的“管涌"[1]:汛期堤基上游水位升高,当水力梯度超过其临界水力梯度时,堤基地质体上覆弱透水层
收稿日期:2018-03-22
作者简伞:想1968-),男,山东菏泽人,高级工程师,从事水利水电工程地文地质勘察与研究工作。
薄弱处将会被高压水流顶冲,使堤基土层结构发生渗透破坏多出现管涌.据国内现有资料调查统计分析可以治.重大水利工程项目中堤坝溃决发生的基本原因,90%以上是由于堤基结构土体渗流变形不利等因素引发管涌破坏导致的2].目前,对双层堤基渗流变形特征的研究主要以下伏砂层的研究较多,而对堤基地质体渗透破坏后与之带来的上覆粘性土层的破坏情况研究较少,国内著名研究学者李宁新等在对双层堤基承压水“渗而不流”模式进行研究时发现了高压水头作用下的双层堤基土体破