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...

Examples

Embodiment 1

[0021] A method for setting up blind drainage ditches in large-scale filling sites in loess hilly and gully areas is as follows:

[0022] The design of the blind ditch route is based on the principle of not changing or destroying the original flow direction. According to the original topography and natural water system of the site, the primary and secondary blind ditch is set according to the surface catchment area and flow, and the main blind ditch is set in the valley with large catchment area and flow. For ditch, set secondary blind ditch in small gully, set drainage branch blind ditch at spring hole, structural water outlet or other seepage point, said primary, secondary and branch blind ditch are connected to form a complete drainage blind ditch system;

[0023] The stratum position of the blind ditch is selected to be set at the interface between the soil layer and the bedrock, the trench is excavated in the bedrock, and the excavation is cleaned to the moderately weathered be...

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...

Examples

Embodiment 1

[0021] A method for setting up blind drainage ditches in large-scale filling sites in loess hilly and gully areas is as follows:

[0022] The design of the blind ditch route is based on the principle of not changing or destroying the original flow direction. According to the original topography and natural water system of the site, the primary and secondary blind ditch is set according to the surface catchment area and flow, and the main blind ditch is set in the valley with large catchment area and flow. For ditch, set secondary blind ditch in small gully, set drainage branch blind ditch at spring hole, structural water outlet or other seepage point, said primary, secondary and branch blind ditch are connected to form a complete drainage blind ditch system;

[0023] The stratum position of the blind ditch is selected to be set at the interface between the soil layer and the bedrock, the trench is excavated in the bedrock, and the excavation is cleaned to the moderately weathered be...

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