Method for rapidly treating soft foundation through high vacuum densification

Abstract

The invention provides a method for rapidly treating soft foundation through high vacuum densification. The method comprises the following steps: 1. respectively inserting a plastic drainage board and a vacuum well point tube into the soft foundation needing to be treated, wherein the plastic drainage board is covered by a geotextile; the upper end of the plastic drainage board is sealed by a cover; the cover is provided with a connector for connecting the cover with a hose and is connected to a vacuum-pumping system via the hose; and the vacuum well point tube is connected to the vacuum-pumping system via the hose; 2. covering the connector connecting the hose with the cover at the upper end of the plastic drainage board with clay to ensure the connector to be dense and air tight; and 3. starting the vacuum-pumping system to carry out cross densification construction combining variable energy dynamic compaction and vacuum pumping several times. The method provided by the invention has the advantages of further shortening of the construction period, saving of the construction cost, controllable quality, environment-friendliness and the like. By using the method provided by the invention, the moisture content of the soft soil can be rapidly reduced, the construction quality of the engineering can be ensured and the construction period can be shortened.

Description

technical field [0001] The invention belongs to the field of soft ground treatment engineering, and in particular relates to an improved rapid "high vacuum densification" soft ground treatment method. Background technique [0002] Due to the poor permeability, high water content and low bearing capacity of saturated soft soil, the reinforcement treatment of soft soil foundation has always been a worldwide problem. [0003] The existing "standards" believe that dynamic compaction is not suitable for saturated soft soils, because disturbances tend to produce "spring soil", which leads to a decrease in the bearing capacity of soft soil foundations after disturbances. [0004] Therefore, at present, there are mainly the following methods for the reinforcement of saturated soft soil at home and abroad: [0005] 1. Gravel pile method: mature technology, high bearing capacity, and convenient construction; but there are disadvantages such as requiring a large amount of rocks and no...

AI Technical Summary

Problems solved by technology

[0005] 1. Gravel pile method: mature technology, high bearing capacity, and convenient construction; but there are disadvantages such as requiring a large amount of rocks and not being environmentally friendly;

[0006] 2. Cement mixing pile method: mature technology and strong applicability; but there are disadvantages such as polluting the environment, difficult to control the quality, and high cost;

[0007] 3. Vacuum preloading method: mature technology, deep treatment depth, and environmentally friendly construction; but there are disadvantages such as long construction period, high cost, and low bearing capacity;

[0008] 4. Heap load preloading method: mature technology and deep processing depth; but there are disadvantages such as the need to transport a large amount of earth and stone, difficult resources, high cost, and long construction period;

[0009] 5. Vacuum combined surcharge method: mature technology, deep treatment depth, high bearing capacity after treatment, and small post-construction settlement, but there are disadvantages such as longer construction period and higher cost;

[0010] 6. High vacuum densification method (China Invention Patent No. 01127046.2): ​​This is a new technology for soft soil foundation treatment in recent years. The depth is shallow, and it is difficult to control the quality of soft soil with low permeability parameters;

[0011] 7. Plastic drainage board + dynamic compaction method: This is one of the new technologies developed in recent years. It has the advantages of short construction period and low cost, but it has the disadvantages of difficult to control the quality of saturated soft soil and low technical index improvement.