Permeation detector and water drain plate permeation testing method

Abstract

The invention provides a permeation detector. An upper pressure chamber and a lower pressure chamber are communicated in a connection manner, a gas inlet is formed in the lower pressure chamber and is connected with a gas outlet of a gas pump, a testing tank is arranged at the connecting position of the upper pressure chamber and the lower pressure chamber, the testing tank is connected with a measuring cup, a pressure bearing membrane and a water permeable membrane are arranged on the upper pressure chamber and the lower pressure chamber, the pressure bearing membrane is away from the connecting position of two pressure chambers, the water permeable membrane is close to the connecting position of the two pressure chambers, and a water inlet is formed between the pressure bearing membrane and the water permeable membrane and is connected with a water inlet box. The invention also provides a detection method by use of the detector. The detection method comprises the steps of mounting a double-model structure, placing sandy soil, mounting a testing sample, introducing water, pressurizing and the like. The double-model structure is adopted to prevent permeation water from permeating from one end of the testing sample, the permeation water permeates into the testing sample after spreading the whole water permeable membrane, and the conformity of the testing result and the practical working condition is improved; a sandy soil mounting groove can simulate the working state of a in-situ water drain plate really; and the testing tank can be opened conveniently for containing the testing sample due to the structures of the upper pressure chamber and the lower pressure chamber.

Description

technical field [0001] The invention relates to the technical field of construction quality monitoring of geotechnical engineering, in particular to a drainage board or sand penetration detector and a drainage board penetration detection method suitable for soft soil foundation reinforcement engineering. Background technique [0002] The engineering quality inspection specification requires that when the drainage board strengthens the soft soil foundation, the quality of the drainage board must be tested, one of which is to test the permeability of the drainage board. [0003] At present, the drainage board penetration detectors used in China all adopt the form of a whole cylinder pressure chamber, and test grooves are set in the center of the left and right covers of the cylinder. When testing, cover the drainage plate with a rubber film and insert it into the test tank, so that the upper and lower openings of the rubber film seal the pressure chamber and the notch of the t...

AI Technical Summary

Problems solved by technology

This tester has the following disadvantages: 1. It is difficult to seal the top and bottom of the drain plate; 2. The rubber membrane is easily damaged when inserted into the test slot; 3. The actual seepage water does not enter from the two ends of the plate, but from the side of the drain plate Infiltration through sand or soft soil, the measurement method does not match the actual working conditions, and the actual working status of the drainage board cannot be fully judged

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