Treatment method for improving collapsible loess foundation

Abstract

The invention relates to the technical field of geotechnical engineering construction, belongs to the field of foundation soil collapsibility treatment, and particularly relates to a treatment method for improving a collapsible loess foundation. The treatment method comprises the following steps that 1, loess is crushed and refined; 2, the crushed and refined loess, lime and alkali metal salt or alkali metal hydroxide or mixtures are evenly mixed, and the even mixing proportion of loess to lime to alkali metal salt or alkali metal hydroxide or mixtures, by dry mass ratio, is 100:0-20:0.5-10; 3, the water content of a mixed material is adjusted to range from 3% to 20%, and then filling is carried out; 4, an alternating-current electric field is applied to the mixed material; and 5, maintenance is carried out on the mixed material subjected to electric field treatment. By means of the technical scheme, the intensity of soil can be improved, the collapsibility of the soil is eliminated, and after-construction uneven settlement is controlled, wherein the compactness degree of the soil cannot meet the standard requirement due to construction machines or personnel control or other reasons in the filling process.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering construction, and belongs to the field of foundation soil collapsibility treatment, in particular to a treatment method for improving collapsible loess foundation. Background technique [0002] Under the action of self-weight stress, or under the joint action of self-weight stress and additional stress, the overlying soil layer on the foundation soil undergoes significant additional deformation due to the structural damage of the soil after soaking in water, which is called collapsible soil and belongs to special soil. [0003] When carrying out engineering construction on collapsible foundations, especially when the filling height is relatively large (such as high filling foundations with a filling height of more than 100 meters), it is necessary to consider the possible impact of additional settlement on the project due to the collapse of the foundation. Harm, choose the appropr...

AI Technical Summary

Problems solved by technology

[0005] When the existing technology encounters collapsible loess sites, especially large-thickness collapsible loess sites, the compaction degree of the backfilled compacted loess after treatment is still not enough, the problem of under-compaction of the foundation soil and poor post-construction The problem of uniform settlement has not been well resolved

Taking the Yan'an New District project as an example, the compaction degree of the backfilled loess after rolling and dynamic compaction is only 70%-80%, which cannot reach the "Code for Design of Building Foundations" GB50007 The degree of compaction is greater than or equal to 93%- 95% requirement

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