HomeCombined vacuum and surcharge preloading method
Release time：Apr 21,2023
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Combined vacuum and surcharge preloading method
The vacuum preloading combined with preloading method is based on vacuum preloading. After the vacuum degree under the membrane meets the design requirements and stabilizes, it is graded for preloading, layered backfilling, and compacted. Vacuum combined surcharge preloading is a new form of foundation treatment that combines vacuum preloading and surcharge preloading, using plastic drainage board vacuum preloading method and surcharge preloading method. The technology of vacuum combined surcharge preloading foundation treatment mainly consists of two parts - drainage system and pressurization system. The drainage system is a vertical and horizontal drainage system formed by inserting a strip of plastic drainage board into a soft soil layer using an insertion machine, and the pressure formed by vacuum pumping through the pressurization system is used. The combined effect of the two increases the pressure difference between positive and negative pore water pressure to accelerate the rise and discharge of pore water, Thus, the settlement process of soft soil foundation is accelerated, and the foundation can be compacted and reinforced.
The vacuum preloading combined with preloading method is based on vacuum preloading. After the vacuum degree under the membrane meets the design requirements and stabilizes, it is graded for preloading, layered backfilling, and compacted. Vacuum combined surcharge preloading is a new form of foundation treatment that combines vacuum preloading and surcharge preloading, using plastic drainage board vacuum preloading method and surcharge preloading method. The technology of vacuum combined surcharge preloading foundation treatment mainly consists of two parts - drainage system and pressurization system. The drainage system is a vertical and horizontal drainage system formed by inserting a strip of plastic drainage board into a soft soil layer using an insertion machine, and the pressure formed by vacuum pumping through the pressurization system is used. The combined effect of the two increases the pressure difference between positive and negative pore water pressure to accelerate the rise and discharge of pore water, Thus, the settlement process of soft soil foundation is accelerated, and the foundation can be compacted and reinforced.
Construction process
Construction preparation and cleaning of the site → laying of sand cushion layer, installation of vertical plastic drainage board → layout and installation of horizontal drainage filter pipes → laying, burying and arranging sealing membranes → installation and vacuum testing of vacuum equipment → normal vacuum maintenance, embankment filling (preloading) → engineering acceptance.
Applicable scope
Vacuum surcharge preloading is applicable to the reinforcement of soft clay foundation. There are marine, lake and river facies soft clay layers in China. This kind of soil is characterized by high water content, high compressibility, low strength and poor permeability. This type of foundation will undergo significant deformation or differential deformation under building loads. For this type of foundation, especially when large-scale treatment is required, such as building airports, docks, ports, storage yards, etc. on this type of foundation, vacuum preloading combined with preloading method is one of the more effective methods for treating this type of soft clay foundation.
Sunzo Foundation Engineering Co., Ltd. is a high-tech enterprise that integrates survey, design, scientific research, and construction. Having branches in Singapore, Indonesia, Malaysia, Philippines, Thailand，It mainly engages in business services such as soft foundation treatment, foundation treatment, foundation pit, reclamation and greening, soft foundation engineering, pile foundation engineering, technical consulting, engineering design, and construction contracting. Welcome to contact for construction plan and quotation.
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