A method for blocking basic seepage channel of negative pressure barrel

Abstract

The invention discloses a method for blocking a basic seepage channel of a negative pressure bucket, comprising the following steps: step 1, pumping water through a pump port to form a water pressure difference between inside and outside; and step 2, when the negative pressure bucket encounters seepage damage and cannot continue to sink, First stop water pumping, and then inject water through the grouting port; step 3, when the water pressure inside and outside the negative pressure barrel is balanced, stop water injection from the grouting port; step 4, grouting through the grouting port, when the slurry is discharged to the outside of the negative pressure barrel, Record the reverse internal and external water pressure difference P at this time 1 ; Step 5, stop grouting for a period of time, let the slurry in the seepage channel solidify; Step 6, inject water through the pump port and open the grouting port, so that the residual slurry is discharged to the outside of the negative pressure barrel, and the reverse internal and external water pressure difference is less than P 1 Step 7, repeat the above-mentioned steps 4 to 6 n times, so that the reverse internal and external water pressure difference is increased to P n >k×Pcr; Step 8: Re-pump water through the pump port to form a water pressure difference between inside and outside. The invention can effectively improve the penetration progress of the negative pressure barrel foundation.

Description

technical field [0001] The invention relates to a method for plugging a basic seepage channel of a negative pressure barrel. Background technique [0002] In marine engineering, compared with traditional pile foundations, negative pressure bucket foundations have several notable features: low material and manufacturing costs, short offshore installation periods, no need for piling equipment, excellent pullout resistance, and accurate positioning. The barrel press foundation has been favored by the marine community in recent years. However, the installation process control of the negative pressure barrel is the main problem that plagues marine engineering at present. [0003] Deep soft clay with high water content, high compressibility and low strength is distributed on the surface of my country's offshore waters. On this soft clay seabed foundation, the pile foundation needs to penetrate the soft soil layer and enter the deeper bearing layer, and the investment is huge. Con...

AI Technical Summary

Problems solved by technology

When the seepage destruction channel connects the inside and outside of the negative pressure barrel, it will affect the formation of the pressure difference between the inside and outside of the barrel, and then the barrel cannot continue to sink, nor can it be ejected by water injection, which affects the smooth progress of the sinking operation. In severe cases, the negative pressure barrel may be scrapped

In recent years, many foreign research institutions have conducted research on negative pressure barrels, and obtained many qualitative laws with practical value. However, there is still a lack of practical tests, especially the solution to the seepage damage of the foundation when the negative pressure barrel sinks. Program

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