Range adjustable double-ring infiltration device and in-situ soil permeability coefficient testing method

Abstract

The invention belongs to the technical field of hydrogeological parameter testing equipment and in particular relates to an improved range adjustable double-ring infiltration device and an in-situ soil permeability coefficient testing method for monitoring in-situ soil infiltration coefficients / permeability coefficients. The device comprises an integral Markov bottle, double rings and an adjustingmechanism, wherein a piston which is moved horizontally is arranged inside the integral Markov bottle; the integral Markov bottle is partitioned by the pisotn into an equivalent inner Markov bottle and an equivalent outer Markov bottle; the double rings comprise an inner ring and an outer ring; the inner Markov bottle is communicated with the area inside the inner ring; the outer Markov bottle iscommunicated with the area between the inner ring and the outer ring. By adopting the range adjustable double-ring infiltration device, in-situ monitoring on ground soil permeability coefficients isachieved, the testing precision of the device is greatly improved as compared with that of a conventional technique, the working efficiency and the in-situ testing data precision are improved, and thedevice is particularly applicable to situations of relatively slow infiltration and relatively long steady seepage and is worthy of popularization.

Description

technical field [0001] The invention belongs to the technical field of hydrogeological parameter measuring equipment, and in particular relates to an improved range-adjustable double-ring infiltration device and an in-situ testing method for soil infiltration coefficient for in-situ soil infiltration coefficient / infiltration coefficient monitoring. Background technique [0002] The in-situ permeability coefficient test of surface soil is one of the basic physical parameters in hydrogeological investigation, and it is an essential key parameter for studying the surface water-groundwater conversion, groundwater flow and solute migration laws. The rainfall infiltration coefficient of surface soil is not only closely related to traditional farmland water conservancy issues such as soil erosion, surface runoff, farmland irrigation, water-induced geological disasters, etc. Pollution performance assessment, and key indicators of major resource and environmental issues such as spong...

AI Technical Summary

Problems solved by technology

[0005] However, the traditional double-ring infiltration in-situ test technology still has many problems as follows: 1. It is necessary to look down when observing the water level of the Marsh bottle, resulting in significant human reading errors in the observation of water level changes; The measurement accuracy of soil infiltration is poor, there are double manual reading errors and large time accumulation errors, which seriously affect the quality of the original monitoring data; Readings have caused great consumption of manpower and material resources and unnecessary safety hazards in field operations; 4. Although the Martens bottle has solved the problem of constant pressure infiltration, it is inconvenient to carry out; 5. The water supply volume of the Martens bottle is limited. Adding water to the Martens bottle during the process will bring errors; 6. The general double-ring infiltration device does not consider the impact of evaporation; 7. The boundary effect caused by the damage to the soil surface during the on-site installation of the instrument may cause contact seepage in the inner and outer rings , affecting the measurement accuracy

Aiming at the problem of low measurement accuracy of the Martens bottle, Cao Jiansheng proposed the "automatic determination method of rock and soil infiltration based on the tipping bucket method" to replace the Martens bottle with a tipping bucket flowmeter for measurement. The invention patent (CN 201611005336.2) provides "one A kind of digital display Martens bottle and its production method", by adding a digital display vacuum gauge to replace the metering

[0007] The above-mentioned many improvements only partly solved the technical problems mentioned above, and improved the applicability, operability and measurement accuracy of the double-ring infiltration device to a certain extent, but still failed to achieve a substantial improvement in the in-situ test accuracy (Question 1 -2), the in-situ test still fails to achieve full automation (question 3), and the testing method is still time-consuming and labor-intensive (question 3-5)

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