Device and method for measuring water storage capacity of outdoor soil body

Abstract

The invention provides an outdoor soil water storage capacity measuring device and a measuring method thereof.The measuring device comprises a shell, a plurality of holes are formed in one side wall of the shell from top to bottom, an air pressure pipe is vertically arranged in the shell, the top of the air pressure pipe is connected with an air pump, and the air pressure pipe is connected with a plurality of air pressure assemblies from top to bottom; the air pressure assemblies are connected with the corresponding holes, the air pressure assemblies are connected with soil water suction sensors, and probes of the soil water suction sensors stretch out of or retract into the holes; a fixing component is arranged between the air pressure assembly and the corresponding hole; the soil water suction sensor is connected with the annular conductive component, the fixed component is provided with a first conductive sheet, and the movable component of the air pressure assembly is provided with a second conductive sheet. According to the technical scheme, the water storage bearing capacity of the outdoor soil body can be predicted, disturbance caused by installation of the test device to the soil body in the to-be-tested area can be effectively avoided, recycling can be achieved, and the test cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of soil water storage measurement, and in particular relates to an outdoor soil water storage capacity measurement device and a measurement method thereof. Background technique [0002] In actual engineering, the rainfall infiltration of soil is a very complicated process, involving many fields such as agriculture, natural environment, and geotechnical engineering. Wherein the measurement method of the soil water storage capacity that is applied in the agricultural field is often based on the intuitive judgment of the inspector or the water permeability of the soil and the water storage capacity are qualitatively compared (such as CN 210626477 U), but applied in geotechnical engineering field is not enough. For the rainfall infiltration measurement of soil in the field of geotechnical engineering, most of the rainfall infiltration devices are carried out indoors, using simulated artificial rainfall, to meas...

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Problems solved by technology

However, the results of the laboratory simulation are still different from those of the field test. The main reasons are not only the stress release of the soil, which leads to the change of the soil structure, but also the difference between the rainfall method simulated in the laboratory and the natural rainfall method.

However, some existing outdoor measuring devices have limitations such as large volume, shallow measurement depth, and inconvenient operation.

In addition, the outdoor infiltration measurement device is affected by the terrain, and it is not suitable for areas with large slopes in the measurement area

[0003] At present, the method of measuring the negative pressure of pore water in soil adopts piezoresistive soil moisture sensor (or called: soil water suction sensor). A water-filled and sealed hygrometer is inserted into the unsaturated soil, and the water film is connected to the pore water to generate a negative pressure in the water in the hygrometer, which can then be converted into an electrical signal output by a pressure sensor, but it does not need to be used in practical applications. Regional fixed-point measurement also has limitations. For example, when the soil depth is deep, the water film on the clay head is easily damaged during the embedding process, resulting in measurement errors

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