Method of processing soft foundation by quick low position high vacuum layering pre-compacting consolidation

Abstract

The invention relates to a quick ''low level high-vacuum hierarchical precompression compaction' method for soft ground, the concretely processes are: 1) a sand layer is laid on the ground before filling, then the plastic water discharging boards are inserted vertically, a high vacuum precompression system is arranged transversely in the sand layer, and a layer of plastic air isolating film is covered; 2) the high vacuum precompressing system carries on vacuum and precompression; 3) the sand blowing high vacuum compacting system is arranged on the film transversely or vertically; 4) fills sand on the film to the set height; 5) the high vacuum precompression system carries on precompressing to the set boding rate, the system carries on the first time of vacuuming and discharge, then carries on the first time of compacting or vibration compacting the sand on the film; 6) carries on the second time or several times of 'high vacuum compacting' to the sand to the overconsolidation state. The invention is short period, low price, and the quality is controllable.

Description

Technical field: [0001] The invention relates to a large-area soft ground treatment method. In particular, it relates to a rapid "low-level high-vacuum layered pre-compaction compaction" soft foundation treatment method. Background technique: [0002] At present, my country's coasts and rivers are generally engaged in economic development and construction by reclaiming land from the sea, while the coasts and rivers are formed by alluvial silt, generally 20 to 60 meters long, with low bearing capacity and low beach elevation, requiring dredging and filling of sand. For this reason, the silt soil and dredger fill soil need to be consolidated for foundation treatment. [0003] At present, the commonly used soft ground treatment methods at home and abroad are: [0004] 1. Plastic plate + vacuum preloading means that after the sand is blown and filled in the silt beach, the plastic drainage plate is inserted first, and then a gas barrier film is added on the surface of the blow...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the construction period is long, the construction can only be carried out after the sand filling is completed, the vacuum load is small, generally about 80Kpa, and the consolidation index after preloading is relatively low

The disadvantages of this method are: it is difficult to source large-area piled soil, the cost is high, and the construction period is long

[0006] 3. Plastic plate + vacuum preloading + soil overload preloading. The main disadvantage of this method is that the transportation of supercarriers is expensive.

[0007] 4. Plastic slab + aggregate dynamic tamping The disadvantage of this method is that the plastic slab is passive and slow drainage, and the dynamic tamping is rapid energy addition. The two methods are not coordinated, and the deep soft soil is hardly consolidated.

This method can save cost and reduce the construction period, but there is a problem of how to deal with surface blasting