Method for treating collapsible loess foundation through combination of deep pre-soaking method and shallow compaction method

Abstract

The invention relates to the field of foundation treatment, in particular to a method for treating a collapsible loess foundation by combining a deep pre-soaking method with a shallow compaction method, and effectively solves the problems of limited treatment depth, longer construction period, lower bearing capacity after treatment and the like of the pre-soaking method. The method includes the specific operation steps that the treatment depth and the treatment range for eliminating the loess foundation collapsibility are determined; an arrangement form and hole positions of piles in the processing range are determined to form pile holes; the pile holes are used for sequentially carrying out deep-layer water soaking and drainage consolidation procedures; cement paste is injected into the pile holes, steel bars are inserted, and rigid piles are formed; within the treatment range, construction is conducted through the shallow soil body compaction method, and flexible piles are formed; and a mattress layer is laid on the upper portion of the foundation, and the rigid piles and the flexible piles are combined to form a multi-pile type composite foundation. According to the method for treating the collapsible loess foundation by combining the deep pre-soaking method with the shallow compaction method, the deep pre-soaking method is combined with the shallow compaction method, so that the deep collapsible loess foundation can be effectively and comprehensively treated, and the bearing capacity of the foundation is improved.

Description

technical field [0001] The invention relates to the field of foundation treatment, in particular to a method for treating collapsible loess foundations by a deep layer presoaking method combined with a shallow layer compaction method. Background technique [0002] The distribution of loess in the world is very wide, with an area of ​​13 million km2, while the distribution area of ​​loess in my country is about 630,000 km2, accounting for about 4.9% of the total area of ​​loess distribution in the world. The distribution area of ​​collapsible loess in my country accounts for about 60% of the total loess distribution area in my country, most of which are distributed in the middle and lower reaches of the Yellow River. [0003] Under a certain pressure, the collapsible loess is soaked by water, and the structure of the soil is rapidly destroyed, and significant additional subsidence occurs. When the deformation or bearing capacity of the collapsible loess foundation cannot mee...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for treating collapsible loess foundations with a deep presoaking method combined with a shallow compaction method, which effectively solves the problems of the limited treatment depth of the presoaking method, a long construction period, and low bearing capacity after treatment. The invention adopts the deep layer presoaking method combined with the shallow layer compaction method, which can effectively and comprehensively treat the deep collapsible loess foundation and improve the bearing capacity of the foundation

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