A Method for Determination of Water Level and Head Height of Confined Aquifer Using Pore Pressure Static Sensing

Abstract

The invention discloses a method for measuring the water level and the water head height of a confined aquifer by the pore pressure static cone penetration test. The method comprises steps of 1) carrying out the pore pressure static cone penetration test on the soil layer of the measured area; 2) according to the soil layer divided by the pore pressure static cone penetration test, determining the aquiclude and the confined aquifer, and determining the top buried depth H1 of the confined aquifer; 3) collecting the pore pressure dissipation test stabilization pore water pressure value u0 in the confined aquifer; and 4) calculating the water level h and the water head height hw of the confined aquifer, wherein the calculation formulas are hw=(u0-[gamma]wD) / [gamma]w=u0 / [gamma]w - D (1) and h=H1 - hw (2), hw indicates the pressure head height of the top surface of the confined aquifer; [gamma]w represents the water weight, taking 10kN / m3; H is the test depth; H1 is the top surface buried depth of the confined aquifer; D is the distance from the hole pressure filter of the pore pressure static cone penetration probe to the top surface of the confined aquifer D = H-h; u0 indicates the pore pressure dissipation test stabilization pore water pressure value at the confined aquifer test depth; h represents the buried depth of the water level of the confined aquifer.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering investigation, in particular to a method for determining the water level and water head height of a confined aquifer by using pore pressure static touch detection. Background technique [0002] In the geotechnical investigation, the water level and head height of the confined aquifer are important hydrogeological parameters, especially for the calculation of the anti-surge stability at the bottom of the deep foundation pit engineering. At present, in the geotechnical engineering investigation, in order to obtain the accurate water level and head height of the confined aquifer, it is necessary to set up the hydrological observation hole of the confined aquifer. The metal circular tube that wraps the filter screen to the confined aquifer, fills a certain gradation of sand and gravel (as the reverse filter material) between the outside of the metal circle tube and the borehole wall t...

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Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies of the prior art, and propose a method for determining the water level and head height of a confined aquifer by pore pressure static contact, directly and quickly testing the water level and head height of a confined aquifer, and solving the current problems. Difficult to measure water level and water head in confined aquifers

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