A device and method for retrieving hydraulic parameters of unsaturated garbage soil

Abstract

The invention relates to a device and method for inverting hydraulic parameters of unsaturated garbage soil, comprising: a reactor, a constant water head infiltration system, a gas pressure stabilization system, and a data acquisition system, and the reactor includes: a cover plate, several screws, and a perforated water-permeable plate , Cylinder body, clay plate, base, several tensiometers, several water content sensors, constant water head infiltration system includes: bucket support, fixed pulley, scale water bucket, infiltration collection cup, water storage tank, pump, gas pressure stabilization system includes : Air compressor and flow meter, data acquisition system includes: electronic balance, data acquisition instrument and data terminal. The device and method can obtain the unsaturated hydraulic characteristic parameters of the water infiltration process of garbage soil only through indoor experiments and numerical simulations, and the accuracy of the calculation results is small. The real flow state of water inside the landfill provides key technical parameters for the evaluation of the water migration state inside the landfill and the formulation of a control plan.

Description

technical field [0001] The invention relates to the field of geotechnical technology, in particular to a device and method for retrieving hydraulic parameters of unsaturated garbage soil. Background technique [0002] The effective way to deal with municipal solid waste in China is the sanitary landfill method, which has the advantages of large processing capacity, wide application, simple process, and low cost. An important factor for detrimentalization and stabilization. With the infiltration of natural rainfall and the replenishment of groundwater, the leachate in the landfill is affected by gravity, and the water reaches the groundwater surface through the unsaturated soil above the landfill, and has gone through a process of infiltration from unsaturated to saturated. , due to the diverse composition, complex arrangement structure and relatively large pores of landfill waste, it often shows strong heterogeneity and anisotropy, which will involve fluids such as water-ai...

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Problems solved by technology

[0005] The invention provides a device and method for inverting hydraulic parameters of unsaturated garbage soil, which solves the errors and defects in the real-time monitoring of accumulated outflow, matrix suction, and water content data in existing test methods, and controls the inversion parameters caused by incomplete data. The technical problem is not unique, and the unsaturated hydraulic characteristics of the water dominant infiltration process of garbage soil can be obtained only through indoor experiments, and the multi-stage pressure step in the experimental process can solve the problem that the inversion parameters are not unique, and the calculation results are accurate and the deviation is small , the selected dual-permeability prediction model of fractured domain and matrix domain is more in line with the real flow state of water inside the landfill, which is of great significance to the control of environmental rock and soil disasters, guidance and optimization of leachate recharge and aerobic ventilation processes value

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