Drainage and anti-seepage method of cofferdam space in high water content dredged mud yard

Abstract

The invention discloses a water-draining and anti-seepage method for high-water-content dredged mud storage yard cofferdam space. The method includes the following steps that (1), a side wall water-draining and anti-seepage composite body is manufactured, geotechnical cloth and a filter screen are connected to the two faces of a plastic seal film in a heated mode, a plurality of non-adhesion strips are arranged at intervals when the filter screen and the seal film are connected in the heated mode, the portion, with a certain length, of the filter screen is reserved in the non-adhesion strip area perpendicular to the length direction of the non-adhesion strips to form a tube bag, and a porous permeable plate is inserted in the tube bag to form the side wall water draining anti-seepage composite body; (2) the side wall water-draining and anti-seepage composite body obtained in the step (1) is laid along the side wall of a cofferdam, and rivets are arranged on the porous permeable plate to fix the a side wall water draining anti-seepage composite body and the like.

Description

technical field [0001] The invention relates to a space drainage and anti-seepage method for a cofferdam of a dredged mud stockyard with a high water content, and belongs to the technical field of water conservancy and waterway engineering. Background technique [0002] The dredging of rivers and lakes and the construction of ports and waterways will inevitably produce a large amount of dredging mud. In domestic dredging projects, hydraulic methods such as cutter suction are usually used for dredging. The dredged silt has a high moisture content and is in a state of thin mud. The disposal method for this kind of dredged mud with high moisture content is usually to requisition the nearby land, build cofferdams, and discharge it into the storage yard for storage. The high moisture content of the dredged mud will inevitably bring hidden dangers to the anti-seepage safety of the cofferdam. First, due to the shortage of land resources, in order to store more mud and reduce land ...

AI Technical Summary

Problems solved by technology

Due to the high water content of the dredged mud, it will inevitably bring hidden dangers to the anti-seepage safety of the cofferdam

First, due to the shortage of land resources, in order to store more mud and reduce land acquisition, the cofferdams of dredged mud yards are often built very high. The water head will easily cause seepage damage to the cofferdam; second, when the yard cofferdam is actually filled, it is often difficult to meet the design requirements due to earthwork compaction, and seepage channels are likely to exist in the cofferdam. The use of silty soil with better permeability to fill the cofferdam will undoubtedly increase the instability of seepage in the cofferdam

Third, the dredged mud often contains more fine particles, and its drainage performance is poor

[0003] For storage yards where the seepage safety of the cofferdam cannot be satisfied in the design, in actual engineering, an impermeable sealing layer is generally laid on the inner slope and bottom of the cofferdam to meet the seepage safety of the cofferdam cofferdam, but this method is not used in practical applications There are the following problems. First, while the sealing layer prevents the seepage of water into the cofferdam, it also closes the channel for the dredged mud to drain downward in the stockyard, making the stockyard a "mud" with a closed bottom and higher than the ground. Pool", this kind of treatment method that only pays attention to waterproofing and does not pay attention to drainage makes the storage yard cofferdam a long-term safety hazard, and does not fundamentally solve the problem of seepage stability in the storage yard; the second is that the sealing layer is usually 1 to 2 layers Very thin plastic film, under the conditions of large-scale construction, the site conditions are generally more complicated, and it is difficult to ensure that the sealing layer will not be punctured to form water seepage concentration points

[0004] Through the search of existing literature, it is found that in order to do a good job of anti-seepage treatment in landfills, drainage is generally taken into account while anti-seepage is done well. Usually, anti-seepage liners and diversion layers are combined. However, it needs to be explained that , due to the particularity of the landfill, its anti-drainage system includes a complex multi-layer combination, and the anti-seepage and drainage materials used are all anti-corrosion special materials. Not only the process is complicated, but also the price is expensive, so it is not suitable for Anti-seepage Treatment of Cofferdam in Large Area Dredged Mud Storage Yard

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