矩形断面是坑探工程中的一个名词，是指巷道横断面为矩形者。适于稳定围岩，不需支护。
压水室设计采用矩形断面、半螺旋形涡室。
The pressurized-water chamber design adopts rectangular section and half-spiral vortex chamber.
结果表明，与圆管、板材等型材的压弯相比，薄壁矩形断面管压弯更容易产生严重的截面畸变；
The results show that the severe cross section distortion takes place much easier in the thin-walled rectangular tubes than that in the circular tubes and plank stuff.
当小流量时水流动力轴线的位置取决于主槽的位置，当大流量时水流动力轴线的变化规律接近矩形断面的情形。
The position of power axis of flow is determined by main channel when runoff is small, while the change law conforms with the law of rectangular section when runoff is large.
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