Method for consolidating hydraulically-filled soft clay in hydraulic filling process by using vacuum preloading method

Abstract

The invention discloses a method for consolidating hydraulically-filled soft clay in the hydraulic filling process by using a vacuum preloading method. In the method, a drainage board with the length of 4-5m is artificially inserted in the original soft clay or hydraulically-filled soft clay, wherein the upper end of the drainage board is connected with a drain system which is connected with a water permeable pipe; soft clay is hydraulically filled, during which, the mode of hydraulically filling in blocks is adopted and a drain system is paved on the hydraulically-filled soft clay meeting the thickness requirement and is connected with the water permeable pipe; the drain system comprises a horizontal drainage board connected with the upper end of the drain board and a main drainage boardconnected with the horizontal drainage board; and the main drainage board is connected with the water permeable board. By using the invention, the thicker hydraulically-filled soft clay can be treated by vacuum preloading; by using loading upper-layer soft clay on lower-layer or original hydraulically-filled soft clay, so that the lower-layer hydraulically-filled soft clay starts to consolidate as early as possible and the settlement amount can be eliminated as early as possible; the drainage board can be reasonably inserted and paved in the hydraulically-filling process and the time is saved; and in addition, the invention saves money and reduces energy consumption.

Description

technical field [0001] The invention relates to a method for reinforcing blow-fill soft clay by adopting a vacuum preloading method in the process of blow-fill soil, and belongs to the technical field of foundation treatment engineering. Background technique [0002] At present, there are many ways to deal with dredging soft clay, but the main method is preloading: trying to insert drainage channels in the dredging soft clay, generally using plastic drainage boards, hereinafter referred to as drainage boards, and then applying pressure on them Or vacuum preloading, so that the moisture in the dredging soft clay is discharged out of the dredging soft clay through each drainage channel, reducing the water content of the dredging soft clay, thereby improving the characteristic value of the bearing capacity of the dredging soft clay and reducing the compressibility. That is to reduce the settlement of future buildings and structures, improve the physical and mechanical propertie...

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Problems solved by technology

[0002] At present, there are many ways to deal with dredging soft clay, but the main method is preloading: trying to insert drainage channels in the dredging soft clay, generally using plastic drainage boards, hereinafter referred to as drainage boards, and then applying pressure on them Or vacuum preloading, so that the moisture in the dredging soft clay is discharged out of the dredging soft clay through each drainage channel, reducing the water content of the dredging soft clay, thereby improving the characteristic value of the bearing capacity of the dredging soft clay and reducing the compressibility. That is to reduce the settlement of future buildings and structures, improve the physical and mechanical properties of dredging soft clay, and achieve the safety of various buildings and structures on it, but the above-mentioned foundation treatment methods have defects such as time-consuming and expensive.

[0003] Usually, in order to insert drainage boards into the soft clay, it is necessary to wait for the soft clay to have a certain strength, and then carry out foundation treatment, which takes about two years (naturally air-dried), and then carry out foundation treatment; although there are also some straight-drain types Vacuum preloading method is a technology for strengthening soft soil foundation, which can reduce the waiting time and does not require sand cushion after using some filter pipes. However, the thickness of soft clay is basically about 3m, and multiple vacuum filter pipes and inserting soft The drainage boards in the soil are connected, and then vacuum preloading is carried out. When the soft soil thickness of about 10m needs to be treated, a long drainage board needs to be inserted twice and the second vacuum preloading is performed, that is, the first vacuum preloading makes the blow-fill The soft clay has a little strength so that the machine for inserting the drainage board can be used, and the direct connection of the vacuum tube to the upper drainage board is time-consuming and difficult to ensure the quality. Although great progress has been made, it is time-consuming and expensive; Reinforcement according to depth

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