Closure method capable of avoiding deepwater dyke end slump

Abstract

The invention relates to a deepwater closure method of water conservancy and hydropower engineering, in particular to a closure method capable of avoiding deepwater dyke end slump. The closure method includes: determining the range of bedding course according to the cross section shape of reiver channels and cofferdam layout; determining location of a positioning ship according to water flow, water depth and type of throwing materials within the scope of the bedding course and then determining throwing position of a barge hopper according to the location of the positioning ship; throwing a great quantity of throwing materials underwater at one step at a throwing position by a large-tonnage barge hopper and throwing the materials in a staggered manner properly in a transverse direction and a longitudinal direction of the barge hopper; enabling the fill level of the bedding course within a range of a closure banquette to be higher than the fill level within a range of a cut-off wall of an upstream side weir body to form a high-and-low bucket structure until reaching a preset fill level, and so as to prevent water from scouring the throwing materials on the banquette directly and reduce loss of the throwing material during flooding. By the closure method, dyke end slump during attacking and filling process to the closure banquette and the weir body due to use of the direct attacking and filling method is avoided, safety of personnel and machinery is guaranteed, while the requirement of navigation during the construction period of the bedding course can be met.

Description

technical field [0001] The invention relates to a water closure method under deep water conditions of water conservancy and hydropower projects, in particular to a water closure method capable of avoiding embankment collapse under deep water conditions. Background technique [0002] In the diversion and interception of water conservancy and hydropower projects, for the interception under the condition of large flow and high water depth, if the dike is directly occupied, the dike head may collapse on a large scale. The main reason is that the water depth of Longkou is relatively large, and the dike The throwing and throwing materials cannot be thrown to the bottom of the slope at one time along the embankment head slope, and it is easy to form a critically stable slope. When encountering external disturbances such as occupation, the throwing and throwing materials will slide down and roll to cause collapse; another reason is that the throwing and throwing materials are under t...

AI Technical Summary

Problems solved by technology

[0002] In the diversion and interception of water conservancy and hydropower projects, for the interception under the condition of large flow and high water depth, if the dike is directly occupied, the dike head may collapse on a large scale. The main reason is that the water depth of Longkou is relatively large, and the dike The throwing and throwing materials cannot be thrown to the bottom of the slope at one time along the embankment head slope, and it is easy to form a critically stable slope. When encountering external disturbances such as occupation, the throwing and throwing materials will slide down and roll to cause collapse; another reason is that the throwing and throwing materials are under the action of the water body. , the change of the friction between the thrown blocks and the gradual compaction after wet water will form the embankment head "subsidence", resulting in sudden large-scale landslides

[0003] The dike collapse problem is a prominent phenomenon in large water depth and low flow rate closure. It not only affects the construction progress, but also endangers the safety of construction personnel and machinery, and becomes a prominent problem in deep water closure; For a long time, the problem of obstruction to navigation is very prominent for rivers that require navigation

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