Treatment method of double-layer composite vacuum preloading and filling soft soil foundation

Abstract

The invention relates to a processing technology for hydraulic reclamation to soft foundation, particularly relates to a double-layer vacuum preloading and hydraulic reclamation soft foundation processing method, and belongs to the field of geotechnical engineering. According to the method, double-layer soft soil treatment is used, so as to overcome the defects of insufficient treatment depth and submucosal vacuum degree degression with depth in a single vacuum preloading technology, the energy transmission efficiency of vacuum degree along depth is increased, and a sealed drainage system designed ensures that the loss of the submucosal vacuum degree is reduced, so that soft foundation processing depth is enabled to be increased greatly, vacuum preloading treatment way is performed on upper half shallow soft soil, meanwhile a vacuum and overload combined preloading treatment way is performed on lower half deep soft soil, so that the phenomenon of bad solidification effect of a deep layer caused by difficulty water drainage in a traditional way is avoided.

Description

technical field [0001] The invention relates to coastal dredging and filling soft soil foundation treatment technology, in particular to a double-layer compound vacuum preloading soft soil foundation treatment method, which belongs to the field of geotechnical engineering. Background technique [0002] With the continuous expansion of urbanization construction scale and the rapid growth of foreign economic and trade, my country's coastal port cities have entered a new period of comprehensive development. Beautiful scenery. Land reclamation projects in coastal areas all face an important problem, that is, such areas are mostly silty clay with high moisture content and high compressibility, and a high-efficiency, energy-saving and environmental-friendly technical means is needed to deal with it. Since the 1990s, vacuum preloading technology has emerged as a new technology for dealing with weak soil foundations, and has been continuously developed and improved for decades, resu...

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Problems solved by technology

[0005] The invention relates to a double-layer compound vacuum preloading foundation treatment method, which uses double-layer soft soil treatment, overcomes the defects of insufficient treatment depth of the previous single vacuum preloading technology and the vacuum degree under the membrane decreases with the depth, and increases The transmission energy efficiency of the vacuum degree along the depth, and the design of the sealed drainage system reduces the loss of the vacuum degree under the membrane, which greatly increases the depth of soft soil foundation treatment. The upper half of shallow soft soil is treated with vacuum preloading, while the lower half of deep soft soil The vacuum and surcharge combined preloading treatment method for the soil makes up for the poor consolidation effect of the deep layer due to the difficulty of drainage in the traditional method

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