Frost-damage-prevention permeable blind ditch and construction method thereof

Abstract

The invention relates to a frost-damage-prevention permeable blind ditch and a construction method thereof. The permeable blind ditch is arranged below a frozen earth depth (9) and has a longitudinalslope gradient of 1%-2%, and comprises a gravel permeable layer (6), a medium-coarse sand filter layer (4), a supporting layer (2) and a mesh hole drainage pipe; besides, two layers of permeable geotechnical cloths are used for realizing a cylindrical structure with the central gravel permeable layer and the outer layer medium-coarse sand filter layer for wrapping the permeable layer; foundation water can permeates below a frozen earth line effectively and smoothly; underground filtration in a whole foundation zone is reduced, so that frost damage is effectively avoided; the foundation filtration water can be automatically drained along the ditch; soil particles around the permeable blind ditch can be effectively prevented from entering the blind ditch; and the blind ditch is prevented from being blocked, so that the blind ditch can be used for ever. Furthermore, the construction method is simple in procedures and can be finished in a short time, so that time is saved, and constructioncost is reduced; and the construction method can also be applied to filled foundation engineering foundation water drainage constructions, and is worth wide promotion.

Description

technical field [0001] The invention relates to the technical field of frost-heaving foundation treatment technology, in particular to a blind ditch for preventing freezing damage and seepage and a construction method thereof. Background technique [0002] With the rapid increase of my country's national comprehensive economic strength, long-term oil pipelines are playing an increasingly important role in economic construction. There are many pipelines passing through in Northwest my country, such as oil and gas pipelines used as supporting buildings for long oil pipelines. Light buildings such as stations also appear in large numbers. However, there is a wide range of permafrost in the northwest of my country. Due to the high moisture content of the permafrost as the foundation and the poor drainage of the foundation soil, the ice accumulation effect will occur during the freezing process, which will cause the volume of the soil to expand. , produce frost heaving force, defo...

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Problems solved by technology

[0004] According to previous engineering examples, the combination of drainage ditch and blind ditch will be used in the treatment of subgrade freezing damage, which has a certain anti-freezing effect on the subgrade, but its blind ditch settings include insulation boards, permeable geotextiles and waterproof geotextiles And buried drainage pipes in gravel, the structure is complex and the buried depth is relatively shallow. At the same time, the blind ditch is used for the subgrade structure and the side slope of the subgrade, and is not suitable for light building frost heaving foundation treatment

[0005] The traditional blind ditch is mostly composed of non-woven geotextile wrapped graded sand and gravel and drainage pipes embedded in the gravel, but its structure is too simple, it is easy for the upper soil particles to enter the blind ditch channel, and it is easy to cause blockage of drainage pipes over time. Blind ditch drainage is not smooth, affecting the treatment effect and service life

It can be seen that if the traditional blind ditch is used in the foundation treatment, not only the groundwater in the foundation cannot be effectively removed, but also the groundwater will be stored in the foundation over time, which will increase the moisture content of the foundation soil and aggravate the occurrence of freezing damage.

[0006] In view of the above, the existing frost-heave foundation treatment methods cannot reasonably solve the frost-heave foundation treatment for light buildings such as oil and gas stations.

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