Model device of vertical isolation engineering barriers based on dry-wet circulation, and using method and application thereof

Abstract

The invention discloses a model device of vertical isolation engineering barriers based on dry-wet circulation, and a using method and an application thereof. The model device comprises a model box, alarge water tank, a small water tank, an air pressure control valve, an air compressor, a glass bottle, Whatman #42 type filter paper and the like. The testing device can be used for determining theactual total suction, moisture content, engineering barrier saturated permeability coefficients, effective diffusion coefficients and the retardation factor performance of various types of vertical isolation engineering barriers after dry-wet circulation in the depth direction. Meanwhile, the invention further provides a test method of the model device of the vertical isolation engineering barriers based on dry-wet circulation. The testing method is simple and feasible, can determine the total suction change and the moisture content change of the engineering barrier after the dry-wet cycle, and determine the saturated permeability coefficients, the effective diffusion coefficients and the retardation factor performance of the engineering barriers, and provides a scientific basis for the design scheme of the vertical isolation engineering barriers.

Description

technical field [0001] The invention relates to the fields of environment and geotechnical engineering, in particular to a model device, a use method and an application of a vertical isolation engineering barrier based on a dry-wet cycle. Background technique [0002] The vertical isolation engineering barrier is an in-situ isolation technology that controls the migration of contaminated groundwater and pollutants in the soil of the contaminated site. During the service of the vertical isolation engineering barrier, it is in direct contact with groundwater. The climate has diurnal, seasonal, and multi-year changes, and the groundwater affected by it also forms a corresponding periodic change, of which seasonal changes have the most obvious impact on the dynamics of diving. The climate of our country is affected by the monsoon, and the precipitation is concentrated in summer, at this time, the precipitation recharge increases significantly. As the temperature rises, the rel...

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Problems solved by technology

Therefore, during the long-term service of vertical isolation engineering barriers, due to climatic factors, the groundwater level will rise and fall periodically, and some vertical isolation engineering barriers will be affected by the dry-wet cycle, thereby affecting their engineering performance.

[0003] At present, there is no method of simulating the periodic rise and fall of the groundwater level to observe the law of the influence of the dry-wet cycle on the performance of the vertical isolation engineering barrier, and it has not been possible to evaluate the scope of the influence of the groundwater level rise and fall on the suction of the vertical isolation engineering barrier through indoor tests.

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