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现有一些土坝工程往往存在溢洪道容量偏小而无法排泄其最大洪水的缺陷。为此,人们考虑采用费用低廉的柔性薄膜作为护层的非常溢洪道。这类形式溢洪道过去主要用于低水头水工建筑物上,随着经验的累积,目前可考虑将其应用于高水头水工建筑物中。该种溢洪道的基本结构是在现有堤坝或新建堤坝上修建一个由土工薄膜衬砌的溢洪道;而在运行时,薄膜将起到不透水屏障的作用而使堤坝免遭冲刷。溢洪道在未启用
Some existing dam projects often have the shortcomings of spillway capacity is too small to discharge its maximum flood. To this end, people consider the use of inexpensive flexible film as a very spillway spillway. In the past, such forms of spillways were mainly used in low-head hydraulic structures. With the accumulation of experience, it is currently considered to be applied to high-head hydraulic structures. The basic structure of this type of spillway is to construct a spillway lined with geotextile on an existing dyke or a new dyke; in operation, the membrane will act as a water impermeable barrier to protect the dam from erosion. Spillway is not activated