Soil air permeability vacuum extraction layering test method based on cluster wells

Abstract

The invention relates to the field of soil environment treatment and remediation, in particular to a vacuum extraction layering testing method for soil air permeability based on cluster wells. The soil air permeability vacuum extraction layering test method based on cluster wells comprises the following steps: analyzing hydrogeological data of a test plot, building a well, connecting equipment, carrying out vapor extraction and airflow monitoring, and calculating soil air permeability; through the method, the gas pressures of different depths and different layers of a monitoring point can be measured; the method is high in result precision and high in representativeness, the air permeability of soil of different depths and different soil layers can be obtained through one-time measurement,the air permeability of different soil layers can be obtained through one-time test, manpower, material resources and time are saved, and the method is effectively used for soil pollution treatment and remediation design and construction.

Description

technical field [0001] The invention relates to the field of soil environment treatment and restoration, in particular to a method for vacuum extraction and layering testing of soil air permeability based on cluster wells. Background technique [0002] With the rapid development of industrialization and urbanization, my country is facing severe soil pollution problems. Soil vapor phase extraction, multiphase extraction, biological ventilation, and air injection are the most commonly used in-situ soil remediation technologies abroad. These technologies arrange extraction wells and ventilation wells in the soil layer, and use vacuum pumps and ventilation pumps to drive the soil- The air flow in the groundwater can promote the analysis, desorption, volatilization and degradation of pollutants in the soil and groundwater, so as to purify the polluted soil. In recent years, it has received more and more research and application in China. [0003] Soil air permeability refers to ...

AI Technical Summary

Problems solved by technology

The vacuum extraction test method sets extraction wells and air pressure monitoring wells in the soil, and makes the soil form a pressure drop through vacuum extraction, and then calculates the soil air permeability through the soil air pressure distribution. This method is currently the most accurate method for measuring soil air permeability. method, but this method obtains the average air permeability of the soil. Due to the spatial heterogeneity of the soil, the representativeness of the result is not high. At the same time, the air pressure monitoring well of the existing vacuum extraction method is a single-layer well, and one monitoring point Only one air pressure data can be obtained, which affects the representativeness of the test results. If the air permeability of soil at different depths is to be obtained, layered drilling and layered testing are required, which will consume additional manpower, material resources and time

[0005] Therefore, the existing technology has a large room for improvement

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