A gray soil anti-osmotic film-mixing wall combined with the foundation structure and design method

Abstract

The invention discloses a lime-soil anti-seepage membrane-stirring wall joint foundation structure and a design method thereof, comprising a field seal layer, a plain soil layer, a first lime-soil layer, a first anti-seepage membrane, a second The lime soil layer and the second anti-seepage membrane, the second anti-seepage membrane is provided with a mixing wall along the underground direction; the design method specifically includes the following steps: Step 1: Design the field sealing layer according to the sealing requirements of the collapsible loess field, and according to the location of the project The maximum frozen soil depth in the area determines the buried depth of the foundation; Step 2: Determine the thickness of the plain soil by subtracting the thickness of the field pad sealing layer from the buried depth of the foundation, the first lime soil layer, the second lime soil layer, the first anti-seepage membrane and the second anti-seepage film Various indicators of the permeable membrane; Step 3: The mixing wall is completed by overlapping the mixing piles, and the length of the mixing piles is determined according to the remaining collapsibility of the collapsible loess. The structure of the invention has better waterproof and drainage effect, and the reliability and safety factor of the design method are higher.

Description

technical field [0001] The invention belongs to the technical field of foundation treatment structures and methods, and in particular relates to a combined foundation structure and a design method of a lime-soil anti-seepage membrane-stirring wall. Background technique [0002] At the present stage, when constructing substation projects in the self-weight collapsible loess areas of grade III and above, the foundation needs to be treated. Due to the light weight of substation construction and structures, the foundation is usually shallow. But at the same time, the collapse of self-weight collapsible loess of grade III and above is not due to insufficient foundation bearing capacity, but the main reason is the rapid settlement and rapid reduction of bearing capacity of self-weight collapsible loess after encountering water. At this stage, the commonly used treatment methods are lime-soil compaction piles and dynamic compaction, and water immersion treatment is also applied in...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a lime-soil anti-seepage membrane-stirring wall joint foundation structure and design method, which can replace the compaction pile method, dynamic compaction method and water soaking method to deal with large-thickness collapsible loess foundations, and solve the current problem of lime-soil Compaction piles and dynamic compaction not only have complex construction techniques, but also have high requirements on the site and high cost; and when water immersion treatment is used, there is a large demand for water and a long construction period

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