Separable grouting pre-pressing method for soft foundation

Abstract

The invention relates to a separable grouting pre-pressing method for a soft foundation. The method is characterized by comprising the following steps of 1, quickly separating and decreasing water content; 2, arranging a sealing layer; 3, pre-pressing and reinforcing; 4, backfilling a tube well. According to the separable grouting pre-pressing method for the soft foundation, the construction is simple, the construction cycle is short, the cost is low, the main problems of large post-construction settlement and low bearing capacity of the soft foundation can be solved by the method for reinforcing, and moreover, the thickness of the sealing layer arranged on the surface layer can be adjusted and filtering holes in the tube well can be formed, so as to reinforce 4 to 6m shallow layer; in addition, a deep layer can also be reinforced, and the reinforced layer is 20 to 30m in thickness.

Description

technical field [0001] The invention relates to a weak ground separation grouting preloading method, which is suitable for the reinforcement treatment of weak soil bodies that cannot meet the bearing capacity and compaction degree required by the design. The method can quickly form a vacuum preloading place on the surface of the soil body. The necessary sealing layer improves foundation bearing capacity, effectively eliminates post-construction settlement, etc., and belongs to the technical field of foundation treatment. Background technique [0002] At present, coastal areas often use the method of reclamation to reclaim land from the sea, that is, to use the method of reclamation to reach the required elevation for construction. Due to the complex land conditions of the new dredging and filling of silt, and the lack of access to manpower and machinery, it takes one year to wait after conventional reclamation Or several years later, after a natural hard shell is formed on t...

AI Technical Summary

Problems solved by technology

That is, by inserting plastic drainage boards according to a certain grid on the weak foundation, after establishing vertical drainage channels, connecting the drainage boards through corrugated filter tubes to establish horizontal drainage channels, and then laying geotextiles and sealing films on them to consolidate the soil. In the actual construction process, according to the soil quality, it is necessary to build a sealing wall around the reinforced soil to ensure the sealing performance of the reinforced soil. The free water in the soil is discharged by vacuuming, and at the same time, the membrane is used to The pressure difference between the vacuum and the atmospheric pressure compacts and strengthens the soil, so the cost is high, the time is long, and the requirements for vacuum formation are high.

[0003] Due to the high water content and low bearing capacity of the new dredger reclamation site, especially the newly dredger reclamation silt, after adopting the method of "vacuum preloading" and "vacuum combined surcharge preloading", the plastic drainage board remains in the reinforced soil body , the drainage channel still exists, so its consolidation effect is still continuing. After the construction is completed, when the load occurs, the post-construction settlement and the settlement rate still continue, resulting in large post-construction settlement, and the uneven settlement varies with the use load. Produced evenly, its time will last for more than 2 years

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