A drilling method preventing secondary pollution for reconnaissance of a polluted site

Abstract

The invention relates to the field of environmental geotechnics and particularly relates to a drilling method preventing secondary pollution for reconnaissance of a polluted site. The method is characterized in that after the polluted site is drilled to a prescribed depth and soil layer identification or sampling is finished, a protective tube the diameter of which is larger than the diameter of a drilling hole and the length of which allows the tube to reach the present drilling depth is implanted into the drilling hole, thus separating underground water and hole circumferential soil of the drilling hole from the hole opening to the present depth. The method is advantageous in that accuracy of reconnaissance for the site is ensured, cross contamination of water and soil of different depths in reconnaissance processes is effectively prevented, pollution dispersal caused in reconnaissance processes is effectively controlled, the polluted range of the site can be reflected veritably, and the method is convenient in construction, simple in device, convenient to operate and suitable for popularization.

Description

technical field [0001] The invention relates to the field of environmental geotechnical engineering, in particular to a drilling method for preventing secondary pollution in surveying polluted sites. Background technique [0002] In recent years, the relocation of industrial enterprises and the redevelopment of legacy sites have become increasingly urgent. In order to avoid harm to human health and the ecological environment after changing the land use mode of industrial sites, it is necessary to conduct necessary investigations, assessments, and even restoration of the sites. [0003] The site investigation needs to collect the soil and groundwater of the site for detection, and to measure the concentration of pollutants. Generally, if soil at different depths needs to be collected, drilling and sampling are required. To collect groundwater samples, groundwater monitoring wells need to be built. Traditional drilling and sampling may The surface or shallow pollutants will be...

AI Technical Summary

Problems solved by technology

[0003] The site investigation needs to collect the soil and groundwater of the site for detection, and to measure the concentration of pollutants. Generally, if soil at different depths needs to be collected, drilling and sampling are required. To collect groundwater samples, groundwater monitoring wells need to be built. Traditional drilling and sampling may The surface or shallow pollutants will be brought into the deep, and the pollution isolation is not achieved. During the site investigation process, large-scale drilling and sampling are required. If effective measures are not taken for segmental isolation, the pollutants in the site will spread. produce secondary pollution

[0004] Pollution isolation in the investigation process is of great significance. It not only avoids the diffusion of site pollutants caused by the investigation process, but also can truly reflect the actual pollution situation and scope at different depths of the site, and avoids the contamination range caused by cross-contamination during the investigation process. However, at the current stage, pollution isolation cannot be achieved in the process of domestic site survey work. Effective isolation is conducive to ensuring the accuracy of the investigation and the protection of the groundwater and soil environment, so there is an urgent need for a method to prevent secondary pollution. Contaminated Contaminated Site Drilling Methods

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