Water stop device for layered water pumping tests and water pumping testing device and method

Abstract

The invention relates to a water stop device for layered water pumping tests and a water pumping testing device and method. The water stop device comprises a vertical body, a rubber air bag, an air pressure pipe and a vertical water outlet pipe, wherein the rubber air bag sleeves the outer wall of the body; the air pressure pipe is located in the body, one end of the air pressure pipe stretches the top end of the body to form an air pressure connector, an air outlet is formed in the other end of the air pressure pipe, and the air outlet is communicated with the rubber air bag; a water inlet isformed in the lower end of the water outlet pipe, the lower end of the water outlet pipe penetrates through the body, and an air outlet is formed in the upper end of the air outlet pipe. The water stop device greatly avoids the phenomenon that on the current market, a water stop device with a water-stop rubber air bag is shrunk due to expansion to cause air leakage, no influence on the stabilityof a sand and gravel well wall can be caused, the water stop device can be reused, and the engineering cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of engineering geological survey, and in particular relates to a water stop device for a layered pumping test, a pumping test device and a test method. Background technique [0002] The water stop in the layered pumping test is an important work in the field of engineering geological survey, usually the water stop effect can directly affect the accuracy of the whole pumping test. [0003] In actual engineering operation, the traditional water stop device for pumping test is generally composed of rigid joints at both ends and a rubber air bag in the middle. The water outlet port and the air pressure pipe interface are directly connected to the rubber air bag. Expansion to the well wall occurs, but the expansion process of the airbag is not completely caused by the transverse elastic deformation of the rubber, but also depends on the longitudinal shrinkage and deformation of the rubber airbag along the pipe wa...

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Problems solved by technology

[0003] In actual engineering operation, the traditional water stop device for pumping test is generally composed of rigid joints at both ends and a rubber air bag in the middle. The water outlet port and the air pressure pipe interface are directly connected to the rubber air bag. Expansion to the well wall occurs, but the expansion process of the airbag is not completely caused by the transverse elastic deformation of the rubber, but also depends on the longitudinal shrinkage and deformation of the rubber airbag along the pipe wall. big contraction

Although the water outlet interface, air pressure interface and water level gauge monitoring interface are all sealed, the rubber airbag will still cause air leakage under high pressure, and at the same time, when the rubber airbag produces a large shrinkage deformation on the well wall, it will drive loose pebbles The layer or gravel layer moves, causing the well wall to collapse and the hole to collapse, resulting in unnecessary troubles for the pumping test and follow-up work

At the same time, due to the shrinkage and air leakage of the rubber airbag, when the air pressure in the airbag is low, the effective water-stopping distance of the rubber airbag is greatly shortened, and when the groundwater pressure is high, the groundwater may surge to the pumping test layer, which affects the Data Accuracy of Stratification Pumping Test

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