A Method for Strengthening Soft Foundation with Charged Colloid Combined with Vacuum-Electroosmosis

Abstract

The invention discloses a method for reinforcing a soft foundation through electrified sol in combination with vacuum-electroosmosis. According to the method, the electrified sol, namely the TiO2 sol,is electrochemically injected into a to-be-reinforced soft foundation area; part of free water is drained through the vacuum prepressing technology at the early stage; the electrified sol is dehydrated and precipitates, so that solid particles are separated out; due to the fact that the TiO2 serves as a nanometer material and is quite small in particle diameter, and holes among soil particles canbe effectively filled; and in addition, when drainage consolidation is conducted at the later stage through an electroosmosis method, the electrified TiO2 nanometer material moves ceaselessly in a soil body under the effect of a direct-current electric field without disturbing the soil body, drainage of the free water in the soil body is promoted, and the drainage consolidation effect is effectively improved. According to the method, the electrified sol and vacuum-electroosmosis are organically combined together, supplement each other and achieve mutual promotion; the holes among the soil particles are filled with the solid particles separated out of the sol through vacuum prepressing; in addition, electroosmosis efficiency can be effectively improved; drainage of the free water in soil is promoted; and the drainage consolidation effect is greatly improved.

Description

technical field [0001] The invention relates to an application of charged sol in soft foundation reinforcement and a vacuum-electroosmosis composite method, belonging to the technical field of foundation soil reinforcement. Background technique [0002] In some vast areas along the coast and around lakes in my country, due to the particularity of the geographical environment, the soil conditions are relatively complex, and most of the soil types are soft clay, which has a unique high moisture content and high compressibility. , low permeability and low shear strength and other adverse properties, therefore, when encountering such soft clay foundation during the construction period, special reinforcement measures are required to deal with it. At present, the conventional treatment methods for strengthening weak foundations in engineering include surcharge preloading method, vacuum preloading method, electroosmosis method, and vacuum-electroosmosis method. [0003] Technical s...

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Problems solved by technology

[0022] The conductive plastic drainage board used in this method is easy to bend, and the drainage effect is not good, especially the drainage capacity in the later period is obviously reduced, and the strength of the soil body is not uniform after reinforcement.

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