Method for setting up drainage blind ditches in large-scale landfill site in loess hilly and gully region

Abstract

The invention particularly relates to a method for setting up drainage blind ditches in a large-scale landfill site in a loess hilly and gully region. A primary blind ditch is set up in a valley withbig catchment area and large flow volume, a secondary blind ditch is set up in a small gully, and drainage branch blind ditches are set up at spring eyes, structure water outlet points or other percolation points. The stratum positions of the blind ditches are set at the interface between a soil layer and a bedrock; the terrain positions of the blind ditches are selected based on that the primaryblind ditch should be set up along the bottom of the valley and the secondary blind ditch and the branch blind ditches should be prevented from excessive changes in slope as much as possible. The slope of the blind ditches is set to not less than 0.5%, and for a steep part with a big slope, vertically connected blind ditches are adopted. A geotextile covers the full cross-sections at the inlets ofthe blind ditches, and at the same time, stones are filled within 2m of the inlets of the blind ditches. The outlets of the blind ditches are subjected to special reinforcement according to the terrain. The method can guide the design and construction of the blind ditches in more detail and is more suitable for the large-scale landfill site in the loess hilly and gully region.

Description

Technical field [0001] The invention relates to a method for setting drainage blind ditch in a high-fill project, in particular to a method for setting a drainage blind ditch on a large-scale filling site in a loess hilly and gully area. Background technique [0002] With the rapid development of my country's economy, more and more cities and industrial construction land have turned to mountainous and hilly areas, and a large number of high filling projects have been formed. Blind ditch plays a vital role as the underground drainage system of high filling project, especially in the loess area. Only by designing and constructing the underground drainage blind ditch well to ensure the smooth drainage of groundwater can we reduce groundwater seepage. The settlement deformation ensures the smooth progress of project construction. [0003] Drainage blind ditch can be divided into whole gravel blind ditch, tubular blind ditch, tunnel-type infiltration ditch, supporting infiltration ditc...

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the technical problem that it is difficult to choose the blind ditch layout position and the structure is difficult to rationally design in the high filling site, and provides a method for setting the drainage blind ditch of the large filling site in the loess hilly gully area

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