Method for improving expansive soil foundation on basis of alternating electric field

Abstract

The invention discloses a method for improving an expansive soil foundation on the basis of an alternating electric field. The method particularly comprises the steps that expansive soil is crushed; the crushed expansive soil, sodium silicate and sodium hydroxide are uniformly mixed according to the dry mass ratio of 100:(1-20):(0.5-3); the moisture content range is adjusted to be between 10% and30%, and then filling is conducted; and electric field treatment is conducted on the filled expansive soil foundation, the alternating electric field is applied when electric field treatment is conducted, the electric field intensity is between 40 V / m and 200 V / m, the electrifying time is between 10 s and 1,000 s, and soil maintenance is conducted for at least 48 hours after electric field treatment. According to the method, the construction technology is simple, the curing rate is high, the maintenance time is short, and the early-stage effect is good; and hydration products generated througha reaction fill pores among particles and achieve the good adhering effect, the expansion and shrinkage property caused by moisture content changes of the expansive soil foundation can be inhibited,the after-construction differential settlement effect is controlled, and the important significance on improvement of the expansive soil is achieved.

Description

technical field [0001] The invention relates to a method for improving expansive soil, in particular to a method for improving expansive soil foundation based on an AC electric field. Background technique [0002] Expansive soil is a special soil with strong expansibility, shrinkage and fissure. The chaotic distribution of cracks in the expansive soil and the repeated water-absorbing expansion and dehydration shrinkage are very harmful to the engineering construction. When the engineering construction is carried out on the expansive soil foundation, the repeated changes in the moisture content caused by climate change will cause the building structure to be uneven. Subsidence causes damage and deformation, which is also the dominant factor. It is necessary to choose a suitable treatment method to avoid or improve the expansion and contraction of the foundation. The purpose of expansive soil foundation treatment is to improve the stability of the foundation by eliminating th...

AI Technical Summary

Problems solved by technology

However, the existing physical methods do not change the nature of the soil, but use external force or foreign materials to limit certain aspects of its properties; while chemical methods often have the phenomenon of long reaction time in the improvement process, low initial strength and poor effect, and often A large amount of mixture needs to be mixed, the mixing process is complicated, and the economic benefit and utilization efficiency are low

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