Method for integrative consolidation of soft soil groundsill by double vacuum self-load combined prepress and dynamic squeeze

Abstract

The invention relates to a method for strengthening the soft foundation with dual-vacuum self-load coupled prestress and power compress, wherein said method comprises: building coffer around the ground; blowing slurry into coffer; laying working cloth and bamboo rods on the slurry surface; the bamboo rod is inserted with plastic discharge plate, vacuum horizontal tube network, vacuum prestress system, and thick soil sealing layer, while the vacuum prestress system vacuums; the mud sealing layer is arranged with vacuum well precipitation system; the electroosmosis tube is inserted at the inner side of vacuum well tube, and mounting electroosmosis system to connect the vacuum well tubev and the cathode of electroosmosis system, and connect the electroosmosis tube and the anode of electroosmosis system to form direct-current loop, and starting the vacuum electroosmosis precipitation; when the vacuum electroosmosis precipitation is end, taking away the electroosmosis tube and the vacuum well tube, and laying one layer of stuff on the ground, to start the first low-energy concrete strengthen, and after two or three times of said process, ending the low-energy concrete strengthen; vibrating and milling, flattening the ground. The invention can process the soft foundation and the slurry layer synchronously, with low solidify period.

Description

Technical field: [0001] The invention relates to a comprehensive reinforcement method for large-area soft soil foundations, in particular to a method for comprehensively reinforcing soft soil foundations with double vacuum self-loading combined with preloading and dynamic compaction. It is suitable for silt and muddy soil foundations with clay and other fine particles and low permeability coefficient, especially suitable for large-area soft foundation reinforcement with high requirements on strength and deformation, and dredging is used to raise its elevation. Sea land reclamation or low-lying land filling project. Background technique: [0002] After reviewing the relevant data at home and abroad, it is found that there are many technological methods for strengthening soft soil foundation and raising its elevation: such as surcharge preloading method, vacuum surcharge combined preloading method, low-level vacuum preloading method, etc. In particular, a new technology named...

AI Technical Summary

Problems solved by technology

[0004] The preload of this construction method is composed of 80kpa vacuum negative pressure and 15kpa mud seal layer self-weight pressure. Low, the bearing capacity of the soft soil after reinforcement is not high

[0005] 2. After treatment, the consolidation index of the mud seal layer is low

However, the vacuum well point dewatering process in the construction method is only applicable to the soil layer with a permeability coefficient R≥0.1m / d. This is a pair of irreconcilable contradictions. Compaction cannot be implemented, and it can only be consolidated naturally under natural evaporation, so the consolidation index of the reinforced mud seal layer is low, especially when the mud seal layer is thick, because there is still an unconsolidated soft interlayer in the middle , the consolidation index of mud seal layer is lower

[0007] The above-mentioned shortcomings will restrict the popularization and application of this process method to a large extent.

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