仰拱

tū shuǐ wèi zhi fā shēng zài yǎng gǒng huò qiáng jiǎo wèi zhi shí duì chèn qì jié gòu de shòu lì yǐng xiǎng xiǎn zhù

突水位置发生在仰拱或墙脚位置时，对衬砌结构的受力影响显著。

Mechanical behavior of lining structure change evidently when suddenly effluent water happen at inverted arch or foot of wall.