Construction Technology of Vacuum Dynamic Consolidation Composite Drainage System for Drought Fill Soft Soil Foundation

Abstract

The invention discloses a process for constructing a composite drainage system in a blow-filled soft soil foundation through vacuum power consolidation. The process solves the technical problems thatin the prior art, the water level before compaction can not be effectively reduced and the strength of the deep soft soil of the soft soil foundation can not be remarkably improved. The process comprises the following steps that composite vertical drainage pipe bodies (2) are manufactured; a grading crushed stone initial combining layer (3) with the thickness of 200 mm is laid on an original-statesoft soil layer (1); by adopting a manual or mechanical mode, the manufactured composite vertical drainage pipe bodies (2) are inserted into the grading crushed stone initial combining layer (3), andthe top ends of all vertical drainage core pipes (9) communicate with one other through a horizontal vacuum pumping pipe (8), and then are connected with a vacuum water pumping pump (7); the primaryvacuum drainage operation is carried out; backfilling and leveling are carried out on the compacted pit; and a bulldozer is used for carrying out site leveling on the treated soft soil foundation area, after leveling is completed, dynamic rolling and static rolling are carried out. After construction, the treated soft foundation soil is controllable in settlement, and the foundation bearing capacity is improved obviously.

Description

technical field [0001] The invention relates to a soft soil foundation treatment method, in particular to a construction technique of a vacuum dynamic consolidation composite drainage system for a large-area deep dredging-filled soft soil foundation. Background technique [0002] At present, the economic construction in my country's coastal areas is developing rapidly, and land reclamation on tidal flats is a commonly used method to solve the shortage of industrial land. The soil in the land reclamation area on tidal flats mainly has the following characteristics: the undisturbed soil is mainly silt or silty soft soil, showing low shear strength, high compressibility, large void ratio, high water content, and strong rheology The material composition of the dredger fill is relatively complex, most of which are dredged silt, clay or silt, which has a soft soil with high natural water content, large void ratio, high compressibility, low shear strength and low permeability coeff...

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Problems solved by technology

[0003] The invention provides a construction technique of vacuum dynamic consolidation composite drainage system for blow-filled soft soil foundation, which solves the technical problem that the existing technology cannot effectively reduce the water level before ramming and significantly improve the soft soil strength in the deep layer of soft soil foundation

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