Method for backfilling light foam concrete in urban abandoned underground space in soft soil area

Abstract

The invention discloses a method for backfilling light foam concrete in an urban abandoned underground space in a soft soil area. The method comprises the following steps that (1) according to the surrounding environment and building conditions of the urban abandoned underground space to be backfilled, a water pumping-backfilling monitoring scheme is formulated, and horizontal displacement and settlement monitoring points are arranged; (2) accumulated water in a project is slowly pumped and drained, internal sundries are cleared, and an internal structure stress and strain monitoring device and a temperature and stress monitoring instrument for the light foam concrete in the backfilling process are arranged; (3) the density rho of the light foam concrete for backfilling is converted through an equivalent load method rho whw = rho h, and light foam concrete with the density grade is prepared; (4) according to a layering and blocking backfilling principle, the waste underground space are divided into layers and blocks, the light foam concrete is sequentially pumped from the interior of a project to an opening for backfilling in a layered and blocked mode, samples are reserved to test the physical and mechanical properties of light foam concrete samples in each backfilling stage until the space is densely backfilled; and (5) the backfilling effect is checked by adopting a coring and geophysical prospecting method.

Description

technical field [0001] The invention relates to a method for backfilling lightweight foam concrete in urban abandoned underground spaces in soft soil areas, and at the same time relates to the utilization of solid waste, and belongs to the field of building lightweight materials and their backfilling. Background technique [0002] Most cities in our country are built on soft ground, such as the Bohai Rim, the Yangtze River Delta, and the Pearl River Delta. The groundwater level in soft soil areas is usually high; the soil has high compressibility, high water content, and low bearing capacity. The problem of settlement and deformation is a very important technical problem faced by urban construction in soft soil areas. The engineering geological problems often encountered in construction in soft soil areas include ground cracks, wall cracks, and building settlements. [0003] With the process of urbanization in China, urban land resources are becoming more and more scarce, ...

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Problems solved by technology

[0013] The invention discloses a method for backfilling lightweight foam concrete in urban abandoned underground spaces in soft soil areas, which is used to solve the problems faced by backfilling urban abandoned underground spaces in soft soil areas, such as easy deformation of the soil, narrow opening of the backfill space, and inaccessibility of large construction machines. And surrounding buildings, roads, pipelines, etc., at the same time, the use of lightweight foam concrete has the advantages of reducing the weight of the backfill body, saving materials, efficient solid waste, and reducing backfill costs.

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