Foundation structure and foundation reconstruction method for backfilling mine pit with interlayer of engineering mud and slag

Abstract

The invention discloses an engineering mud and slag interlayer backfill mine pit foundation structure and a method for rebuilding the foundation. Including the vacuum filter pipe network, sand cushion and mud slag structure unit laid in the abandoned mine pit; there is a layer of vacuum filter pipe network on the bottom of the abandoned mine pit, which consists of multiple parallel horizontal vacuum filter tubes and multiple parallel vertical vacuum filter tubes. The filter tubes are laid vertically and intersectingly; a sand cushion layer is laid on the vacuum filter pipe network, and multiple layers of mud and slag structural units are laid in sequence on the sand cushion layer. Cloth layer, consolidated mud layer, geotechnical composite drainage network, engineering muck layer. The invention utilizes the engineering mud and slag produced in the urban construction process to backfill the abandoned mine pit, which can effectively relieve the disposal pressure of the huge amount of engineering slag and engineering mud in the city, and solve the problems of geological disasters and ecological environment damage caused by irregular disposal and exposed abandoned mine pits , and can regenerate the foundation to realize the regeneration of land resources.

Description

technical field [0001] The invention relates to a pit foundation structure and treatment method in the field of solid waste disposal and reuse, in particular to an interlayer backfilling of engineering mud and dregs in abandoned mine pits, and vacuum preloading of the mud layer to realize engineering mud Drainage consolidation; the method of pre-pressing the slag in the upper part of the stacking project to make the mud compact and harden to rebuild the foundation. Background technique [0002] A large amount of construction waste is produced in the process of urban construction and renovation, including engineering dregs, engineering mud, demolition waste, and decoration waste. Engineering mud is produced in the construction process of bored pile foundation construction, underground diaphragm wall construction, mud-water shield construction, horizontal directional drilling and mud-water pipe jacking. It is a suspension composed of water, bentonite particles, cohesive soil p...

AI Technical Summary

Problems solved by technology

[0004] 1) The engineering mud is in a fluid state and has a low bearing capacity. If the upper part of the landfill is not fully drained and consolidated, it will easily lead to pile instability and mud piping;

[0005] 2) The engineering mud with high moisture content and low solid content will drain and consolidate slowly under the condition of self-weight, which will affect the progress of backfill construction, and cause significant post-construction settlement and affect the terrain slope of the reclaimed land

However, the mud is in a flowing state and has almost no bearing capacity. It is difficult to treat the mud layer with the conventional vacuum preloading method. An improved engineering mud treatment method that is convenient for on-site construction is needed.

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