Sample preparation method for rock-soil body in-situ permeability test

Abstract

The invention discloses a sample preparation method for a rock-soil body in-situ permeability test, and belongs to the technical field of water conservancy and hydropower engineering. The method comprises the following steps: digging a footrill or a branch cavern, protecting the top surface of a rock-soil body to be measured, digging the periphery, galling the top surface and the side surfaces, placing a pressure measuring pipe, placing a template and a water inlet bin, pouring for the first time, filling an upstream surface, treating the water inlet bin, pouring for the second time, maintaining, removing the template and the like. Through protective low-disturbance excavation and anti-seepage water stop treatment, the overflowing area is controlled, the internal seepage pressure of the test piece is ensured, and the accuracy of a test result is high. The method can be suitable for penetration tests of different unfavorable geologic bodies in various exploration environments, and is wide in application range, simple in preparation method, low in cost, high in practicability and very good in adaptability, and test results can more accurately reflect the permeability characteristics of rock-soil bodies.

Description

Technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, involving the penetration test of geoscotectiveness, specifically, for the preparation method of sample permeation trials for the maths. Background technique [0002] The penetration characteristics of geoscotectiveness are an important indicator parameters in geotechnical surveys, and is also one of the key issues of concern in large hydropower projects. In the rock mass, from the upper and lower relatively hard rock clamps, the mechanical properties are poor, the structure is broken, and the water is easy to muddy, and the harm to the construction of the project is very highlighted. It is of great significance to study its penetration characteristics. An indoor penetration test for adverse geosets is to take out the sample with a non-finished geotor from the rock mass to the chamber. The disturbance of the sample structure is large during sampling and transportat...

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Problems solved by technology

[0004] In view of the problem that the internal water head loss of the sample in the existing preparation method cannot ensure that the in-situ permeability test can accurately reflect the permeability characteristics of the rock and soil mass, the present invention provides a sample preparation method for the in-situ permeability test of the rock and soil mass. Disturbance excavation and anti-seepage and water-proof treatment, control the flow area, ensure the internal seepage pressure of the test piece, and the accuracy of the test results is high

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