Method of detecting impact of rise and fall of underground water level on soil percolation and water and salt migration

Abstract

The invention provides a method of detecting impact of rise and fall of underground water level on soil percolation and water and salt migration. The method comprises steps of loading soil sample andsimulating, detecting and analyzing underground water level fluctuation. Through adoption of the method of detecting impact of rise and fall of underground water level on soil percolation and water and salt migration, rise and fall of the underground water level caused by water storage and discharge of a reservoir and underground water extraction and recharge can be simulated in a laboratory, andsoil moisture potential, moisture rate, temperature and salt content of soil at different heights can be measured. The method is easy to conduct and implement, and is highly reliable.

Description

technical field [0001] The invention relates to the technical field of soil research, in particular to a method for detecting the influence of groundwater level rise and fall on soil seepage and water-salt migration. Background technique [0002] Rainfall infiltration, reservoir water storage or release, groundwater exploitation or recharging, etc. are likely to cause groundwater level fluctuations. Rainfall infiltration and groundwater level fluctuations can both promote violent seepage activities inside the soil, and seepage will change the water content of the soil, and then affect the suction of the unsaturated soil matrix. When the groundwater level rises, the moisture content of the unsaturated soil increases, which will reduce the matrix suction, resulting in a decrease in the shear strength of the soil, which is likely to cause disasters such as reservoir bank slope collapse and slope instability under the action of other factors ; When the groundwater level decreas...

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Problems solved by technology

However, the method of prototype observation has some disadvantages. For example, the prototype observation scale is large, there are many influencing factors, and it is impossible to control the changes of rainfall intensity and groundwater level, and the prototype observation has high requirements for instruments and equipment, and there are few instruments and equipment that can be used for prototype observation. , it is difficult to obtain comprehensive and accurate data; another example is the high cost of observation, which requires a lot of manpower and material resources

[0004] The other is the seepage theoretical calculation and numerical simulation method based on soil mechanics and thermodynamics; however, this simulation method introduces a large number of assumptions when establishing a theoretical calculation model or numerical model, and simplifies the complexity of actual engineering. The results obtained are often quite different from the actual situation.

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