A curtain grouting method suitable for both sides of the dam

Abstract

The invention discloses a curtain grouting method suitable for both sides of a dam. The curtain grouting method comprises the following steps of: a) arranging a first row of grouting adits on both sides of the dam, and arranging a second row of grouting adits on a position, below the first row of grouting adits, of an area with great curtain baseline depth; b) arranging branch holes; c) performing vertical curtain grouting in the first row of grouting adits to form a first screen; d) performing vertical curtain grouting in the second row of grouting adits to form a second screen; e) drilling towards the first screen in the second row of grouting adits, and performing curtain grouting, thereby forming a lateral lap-joint curtain; f) performing inclined curtain grouting towards the first row of grouting adits along the axes of the branch holes in the branch holes; and g) performing vertical curtain grouting in the branch holes to form a third curtain. According to the scheme adopted by the invention, secondary excavation of the grouting adits is avoided; and the first curtain, the second curtain, the lateral lap-joint curtain, the inclined curtain and the third curtain are combined to form a sealed anti-seepage structure, so that the anti-seepage effect is good.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower, and in particular relates to a curtain grouting method suitable for both banks of a dam. Background technique [0002] In water conservancy and hydropower projects, the curtain grouting on both sides of the dam is usually carried out in the grouting flat hole. When the curtain is deep, several rows of grouting flat holes are usually arranged, and the axes of each row of grouting flat holes are parallel and staggered for a certain distance. [0003] In actual construction, due to reasons such as unclear geological conditions in the early stage, a certain row of grouting flat holes is often set too short, resulting in "blind spots" in grouting. Such as figure 1 As shown, the second row of grouting flat holes 2 should have been excavated to the bottom line 10 of the grouting flat hole curtain, but due to the previous survey, it only reached figure 1 location shown. In th...

AI Technical Summary

Problems solved by technology

However, this method will cause secondary excavation for the well-supported grouted flat hole, which will increase the amount of excavation and support, and will affect the construction progress

Images