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在长江中游干流和支流的河堤上建有众多的穿堤涵闸。因大多数河堤建在二元地层结构上 ,在粘土覆盖较薄、江河水位较高情况下 ,河堤背水坡坡脚附近容易发生渗透变形。在修建穿堤涵闸时 ,因开挖进、出水口 ,不仅削弱堤身且扰动了弱透水性的覆盖层 ,使穿堤涵闸在汛期比河堤更易发生渗透破坏。针对这种情况 ,介绍了几种常用的穿堤涵闸防渗加固措施 ,并论述了不同条件下穿堤涵闸防渗帷幕的设计方案。以湖北省公安县刘家湾闸为例 ,说明防渗帷幕方案及实施后效果。
In the middle reaches of the Yangtze River mainstream and tributaries of the embankment built a large number of embankment embankment gate. Due to the fact that most embankments are built on a dual stratigraphic structure, infiltration and deformation are prone to occur near the foot of the embankment at the back of the embankment due to the thin clay coverage and the high water level of rivers. During the construction of dikes and culverts, because of digging into or out of water outlets, not only weakened levees and disturbed the seepage of weakly permeable cover make the culvert and culvert of embankments more prone to seepage and destruction than embankments in flood season. In view of this situation, several commonly used anti-seepage and reinforcement measures for sluice culverts are introduced, and the design scheme of anti-seepage curtains for culverts and culverts piercing the embankment under different conditions is discussed. Take the case of Liujiawan Gate in Gong’an County, Hubei Province as an example to illustrate the effect of anti-seepage curtain scheme and its implementation.