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Device and method for testing permeability coefficient of cement soil

A technology of permeability coefficient and measurement method, which is applied in the field of geotechnical material measurement, can solve problems such as long test time, poor water head, and inability to handle water stop, and achieve the effect of shortening the time required for the test

Active Publication Date: 2011-03-16
ANHUI & HUAI RIVER WATER RESOURCES RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a test device and test method for measuring cement-soil permeability coefficient, so as to overcome the problems in the prior art that the water stop on the side wall of the sample cannot be handled, the water head difference is small, the test time is long, the reliability is low, and the test Disadvantages such as low data accuracy and inconvenient use

Method used

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  • Device and method for testing permeability coefficient of cement soil
  • Device and method for testing permeability coefficient of cement soil
  • Device and method for testing permeability coefficient of cement soil

Examples

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Effect test

Embodiment 1

[0018] A cement-soil permeability coefficient measuring device, which includes an upper cover 1 and a base 6, a sealing cover 5 is connected between the upper cover 1 and the base 6 to form a pressure chamber 10, and a pressure shaft 12 is arranged in the middle of the upper cover 1 to extend into the pressure chamber A gland 11 for fixing the cement-soil sample is connected to the end of the pressure shaft 12, a counter-pressure water inlet pipe 7 and a connected pressure pump 7a are arranged on one side of the base 6, and the other end of the back-pressure water inlet pipe 7 leads into the base The protrusion 6a provided in the middle of 6 communicates with the pressure chamber 10. A confining pressure inlet pipe 9 and a seepage pipe 8 are arranged on the other side of the base 6, one end of the confining pressure inlet pipe 9 communicates with the pressure chamber 10, and the seepage pipe 8 passes upward through the pressure chamber 10 to connect with the gland 11 and connec...

Embodiment 2

[0020] According to above-mentioned cement-soil permeability coefficient measuring device, a kind of cement-soil permeability coefficient measurement method that produces comprises:

[0021] a. Install the cement-soil sample 3 on the base 6 in the pressure chamber. After the side wall of the cement-soil sample is coated with a thin layer of Vaseline or oily substance, a rubber film 4 is placed on the outside of the cement-soil sample, and the rubber film 4 passes through the surrounding pressure. 5. Waterproof the side wall of the sample; install permeable stone 2 on the upper and lower parts of the cement soil sample, and tie the rubber film and the base and the upper permeable cap tightly with rubber bands, so that the cement soil sample is placed in a sealed environment; install the upper cover 1 and behind the sealing cover 5, press the gland 11 and fix the cement-soil sample;

[0022] b. Connect the seepage pipe 8 to the bottom of the permeation flow pipe 8a, the side wal...

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Abstract

The invention relates to a device and a method for testing the permeability coefficient of cement soil. The method is characterized by comprising the following steps: a, putting a sample (3) on a substrate (6), coating a thin layer of vaseline on the side wall of the sample, and covering a rubber membrane (4) on the outside of the sample; and putting permeable stones (2) at the upper part and thelower part of the soil sample; b, connecting a permeable pipe (8) with a permeation flux testing tube (8a); c, applying a pressure sigma 3 to a pressure chamber (10) by applying an ambient pressure to a water inlet pipe (9); d, applying a pressure sigma b by applying a back pressure to a water inlet pipe (7); e, reading the permeable flux of the permeation flux testing tube at an interval of delta t, and measuring water temperature T synchronously; and f, calculating the permeability coefficient of the sample according to Darcy's law. The device and the method have the following advantages: the problem of water stop on the side wall of the cement soil is solved by a flexible sealing water-stop method for adopting the rubber membrane; water head difference of permeability of the cement soil can be controlled by using back pressure, and higher water head pressure can be achieved; and when the ambient pressure is applied to the sample for water stop, the sample generates certain deformation and certain excess pore water pressure.

Description

Technical field: [0001] The invention relates to a method for measuring geotechnical materials. In particular, the invention relates to a method for measuring the permeability coefficient of a cement-soil sample. Background technique [0002] In recent years, cement-soil walls formed by cement-soil mixing piles have been widely used in seepage interception projects such as foundation pit water-stop curtains, dams, and gates. The cement mixing pile cut-off wall is a cement-soil continuum formed by mixing and adding a certain amount of cement in the formation using mechanical equipment. From the analysis of the cement-soil mechanism, due to the cement hydration reaction and the action of soil particles and cement hydrate, especially the cementation and ion exchange, the dispersion of soil particles is reduced, and the soil particles are further agglomerated, thereby sealing and filling the gap between particles. The inter-pores increase the strength of the undisturbed soil a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 宋新江
Owner ANHUI & HUAI RIVER WATER RESOURCES RES INST
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