Process for the hydrological untersucung with low water control

摘要

PURPOSE:To measure the coefficient of impermeability by inserting an inner packer provided with a water pressure meter at the tip, into a measuring pipe with packers arranged above and under a strainer, and by heightening the pressure in the pipe to detect the change of the pressure. CONSTITUTION:A water level in a measuring pipe 1 is regulated, and after pressure is applied, a switchable valve 2 is released, and an inner packer 3 is enlarged, and pressure in a slot is heightened like pulse, and after that, its pressure wave is propagated into a bedrock through a strainer 33, and the change quantity of internal pressure attenuated by and by is measured, and a permeability coefficient is found. After that, packers 34, 35 are enlarged, and are permitted to come in close contact with a bore hole 31, and after that, the water level in the pipe 1 is regulated, and after that, the switchable valve 2 is released, and the inner packer 3 is expanded, and a closed space is formed, and a space water pressure is found waiting for the stability of the specification of a data logger 6 with the detection of a space water pressure meter 4.