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Fluidized pit backfill soil adopting contaminated soil as raw material and construction method

A construction method and a technology of polluting soil, which is applied in the fields of earth drilling, filling, mining equipment, etc., can solve the problems of unfavorable environmental protection and the development of low-carbon economy, the pollution of the environment by the preparation of raw materials, the pollution of dust in the environment, etc., and achieve superior stability , Improve strength and availability, and prevent secondary pollution

Pending Publication Date: 2019-09-27
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the backfilling of mine pits does not have high requirements on the performance of materials, the demand for materials is quite large
If the traditional materials such as cement mortar and cement soil are used for backfilling, the cement consumption will be huge, which is not only costly, but also not conducive to the development of environmental protection and low-carbon economy
[0004] The Chinese patent with the publication number CN201110098060 discloses a pit backfill material and its application method, but it has the following disadvantages: (1) The cost of raw materials is high: the backfill material uses a large amount of machine-made sand, which requires manual preparation and high cost; (2) The preparation of raw materials pollutes the environment: dust that pollutes the environment will be produced during the preparation of machine-made sand; (3) The applicable area is small: machine-made sand is broken from larger stones, so it is only suitable for areas with rock distribution

Method used

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  • Fluidized pit backfill soil adopting contaminated soil as raw material and construction method

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Embodiment Construction

[0027] A mine pit in Huainan City needs to be backfilled. At the same time, there is a large amount of river dredging silt that needs to be treated. The silt is rich in a large amount of pesticide residues (herbicides). Considering comprehensively, the dredged silt is used as the contaminated soil raw material to prepare fluidized mine pit backfill soil to backfill the mine pit. The specific implementation steps are as follows:

[0028] (1) Determine the raw material ratio for on-site construction: According to the laboratory test results, determine the raw material ratio of the contaminated soil. The control standards include the fluidity and the diffusion characteristics of soil pollutants after solidification. The components of the dredged silt are determined to be: contaminated soil 95~ 105 parts, 30 parts of curing agent, 50 parts of water, 20 parts of activated carbon powder, 5 parts of water reducing agent, 15 parts of quicklime, 20 parts of expansive soil, 15 parts of ...

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Abstract

The invention discloses a fluidized pit backfill soil adopting contaminated soil as a raw material and a construction method. The backfill soil is prepared from 95-105 parts of contaminated soil, 20-40 parts of a solidifying agent, 30-50 parts of water, 10-30 parts of activated carbon powder, 0-20 parts of a water reducer, 0-20 parts of quick lime, 10-30 parts of expansive soil, 0-10 parts of a shrinkage reducing agent, 0-15 parts of a retarder, 5-20 parts of nanometer silicon dioxide, 10-30 parts of nanometer titanium dioxide, 5-20 parts of nanometer zinc oxide, 5-30 parts of nanometer bentonite, 3-7 parts of perovskite and 1-4 parts of ammonia chloride. The raw materials are mixed, stirred and the like to prepare the backfill soil. The utilization rate of the contaminated soil is remarkably increased, the backfill soil and the air environment are purified, and the high flowability (capable of reaching 157), the unconfined compressive strength (capable of reaching 825 kPa) and the volume shrinkage rate (capable of reaching 2%) are achieved.

Description

technical field [0001] The invention relates to rock and soil and a construction method, in particular to a fluidized pit backfill and a construction method using polluted soil as raw material. Background technique [0002] Industrial pollutants infiltrate slowly into the soil, causing changes in the mechanical properties and chemical composition of the soil, directly affecting engineering activities or harmful to human health, animal reproduction, and plant growth, turning into polluted soil. Common treatment methods for polluted soil include chemical replacement or solidification storage yard. The former mainly extracts pollutants from the soil by electrochemical methods, which is costly and takes a long time, and is greatly affected by the types of pollutants in the soil; the latter Otherwise, a large amount of space will be occupied, and the economic benefits and environmental protection benefits are not obvious. [0003] The hundreds of millions of cubic meters of pits...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/06C04B28/02E21F15/00
CPCC04B28/021C04B28/04C04B28/065C04B2111/00146C04B2111/00724C04B2111/00784E21F15/005C04B18/04C04B18/0436C04B14/022C04B22/064C04B14/361C04B14/062C04B14/305C04B20/008C04B14/104C04B22/124C04B2103/302C04B2103/0068C04B2103/22
Inventor 周爱兆黄献文姜朋明徐浩青
Owner JIANGSU UNIV OF SCI & TECH
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