Measurement system and method for permeability coefficient of shallow-layer sand soil

Abstract

The invention discloses a measurement method for a permeability coefficient of shallow-layer sand soil. The measurement method comprises the following steps of: (1) according to the direction of the permeability coefficient required to be measured, selecting stand pipes with different shapes to be placed in a sand soil layer, wherein the depth of the stand pipes is the depth of the permeability coefficient required to be measured; and (2) quickly filling water to the stand pipes, acquiring the data of water levels in the stand pipes, and calculating the permeability coefficient of the sand soil layer according to a sand soil stand pipe test model. By using the measurement method disclosed by the invention, the permeability coefficient of the shallow-layer sand soil in a natural state can be obtained without drilling; and a measurement system is convenient for carrying, is convenient in operation and has low use cost. The invention also discloses the measurement system adopting the measurement method for the permeability coefficient of the shallow-layer sand soil.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, in particular to a detection device and method for sand permeability coefficient. Background technique [0002] The quantitative test of sand permeability coefficient is related to precipitation infiltration and groundwater recharge, etc. Especially in arid areas, the measurement of sand permeability coefficient is of great significance. At present, there are many methods for determining sand permeability coefficient, mainly including laboratory analysis and field assay. [0003] The laboratory analysis method needs to take samples from the field, and apply Darcy's theorem indoors to obtain the permeability coefficient of the undisturbed soil in the field. This method disturbs the soil greatly, destroys the natural structure of the soil, and cannot be measured in the field. [0004] The field test method mainly utilizes the water pumping method and the water pressure method to o...

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Problems solved by technology

However, this method requires cumbersome equipment and complicated operation, consumes a lot of manpower, material resources and financial resources, and the implementation cost is relatively high.

[0005] An impact test method has been developed abroad, which is a field test method. When it is implemented, it is mainly to set a casing in the logging, isolate the inner wall of the logging, and set a filter at a specific position of the casing to utilize the water level. However, this test method is only suitable for the situation where the caused water level fluctuation is located on the upper part of the filter, if it is used for the screw hole test, or the whole hole is equipped with a filter In this case, there will be a large error in the result; in addition, this test method must be realized with the bushing, which limits its application range

[0006] To sum up, the test methods of the above field experiments all require drilling and measurement, which is relatively time-consuming and labor-intensive, and needs to be improved

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