Temperature-controlled type unsaturated soil consolidometer

A consolidation instrument and temperature-controlled technology, which is applied in the direction of soil material testing, material inspection, and application of repeated force/pulsation force to test material strength, etc. It can solve the test error and cannot obtain the relationship between saturation and suction in real time. Curves, human errors and other problems, to achieve the effect of convenient operation, complete functions, and simple device structure

Inactive Publication Date: 2011-10-19
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process, after unloading and reloading, will produce certain experimental errors and human errors, so that the accurate relationship curve between saturation and suction cannot be obtained in real time

Method used

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  • Temperature-controlled type unsaturated soil consolidometer
  • Temperature-controlled type unsaturated soil consolidometer
  • Temperature-controlled type unsaturated soil consolidometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] see Figure 1~6 and Figure 9 , the temperature-controlled unsaturated soil consolidation instrument of the present invention includes a combined pressure chamber with a bidirectional movement loading pressure piston, the pressure chamber includes a top cover 1, a base 4 and a rigid transparent sleeve 3, and the rigid transparent sleeve 3 The upper and lower ends of the upper and lower ends of the base are respectively sealed and connected to the upper surface of the base 4 and the lower surface of the top cover 1, and the lower end of the rigid transparent sleeve 3 is embedded in the sleeve groove 24 provided on the upper surface of the base 4. In the pressure chamber of the cylinder Axial clamping members are arranged on the two ends of both sides, and the axial clamping members clamp the top cover 1 and the base 4, so that the rigid transparent sleeve 3 is clamped and fixed; The head of the piston is a ventilating end bearing plate 15, which divides the pressure cha...

Embodiment 2

[0038] This embodiment is basically the same as the first embodiment, the difference is:

[0039] see Figure 9 , in the suction test of sample 19 at different temperatures measured by the filter paper method, the shape of the spacer 34 between the filter paper and the sample 19 placed in the temperature-controlled unsaturated soil consolidation instrument of the present invention is reticular. The diameter of the spacer 34 is 40±1mm, and the thickness is 2±0.5mm. When carrying out the unsaturated soil dry-wet cycle test under suction control, the compression test under normal suction or the water immersion expansion test, the air bubbles under the plate 21 can be washed away by the spiral water delivery groove 20 on the stainless steel plate 6 . The water inlet hole 9 of the pressure chamber base can be connected with the water inlet pipe 10 in the center of the spiral water tank 20 on the upper surface of the stainless steel plate 6, and connected with the volume change pip...

Embodiment 3

[0042] This embodiment is basically the same as the first embodiment and the second embodiment, the difference is:

[0043] The experimental device of the present invention is used to test the suction force of samples at different temperatures by the filter paper method, and the installation steps are combined with the attached figure 2 , image 3 and Figure 8 described as follows:

[0044] 1. A stainless steel plate 21 and a stainless steel plate 6 are used to form an inlet and drain device and placed in the center of the upper surface of the pressure chamber base 4, and three pieces of Whatman No.42 type filter paper are placed on the stainless steel plate 21, and the diameter of the filter paper is 40mm;

[0045] 2. Put the compacted sample 19 on the filter paper, put the mesh spacer 34 on the sample 19, then put three pieces of filter paper on the spacer 34, put the rigid transparent sleeve 3 and the outer transparent sleeve 2 Insert the sleeve groove 24 and the out...

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Abstract

The invention discloses a temperature-controlled type unsaturated soil consolidometer, which can be used for geotechnical engineering measuring apparatus manufacture. The temperature-controlled type unsaturated soil consolidometer comprises a combined type pressure chamber with a bidirectional motion loading pressure piston, a diversion system, a displacement meter and laser metering equipment. Heat conducting oil is filled in a sandwich chamber between the outer side of the combined type pressure chamber and an outer-layer transparent sleeve; and moreover, the sandwich chamber is also provided with a thermoelectric couple and a heating rod to control the temperature inside the pressure chamber. When the temperature-controlled type unsaturated soil consolidometer is used, a filter paper method of suction measurement can be employed for measuring the suction of an unsaturated sample under different temperatures; unsaturated soil drying and watering cycle tests controlled under suction and compression tests under constant suction can be implemented to obtain the influence rules of the temperature on the soil-water characteristic and mechanical characteristic of unsaturated soil; andsoaking expansion deformation tests and expansion pressure tests under different temperatures can be implemented, and the expansion deformation of the unsaturated soil and the changing rules of the expansibility are respectively obtained through the displacement meter or a load sensor. The temperature-controlled type unsaturated soil consolidometer has the advantages of complete functions, simplestructure, convenient operation and high test precision.

Description

technical field [0001] The invention relates to a temperature-controlled unsaturated soil consolidation instrument, which relates to a geotechnical engineering measuring device and belongs to the technical field of geotechnical engineering measuring instrument manufacturing. Background technique [0002] The soil-water characteristics of unsaturated soil are usually represented by the soil-water characteristic curve SWCC (Soil-water characteristic curve). The soil-water characteristic curve is a curve describing the relationship between matric suction and saturation or volumetric water content in unsaturated soil. The matric suction in unsaturated soil is the difference between the pore air pressure and pore water pressure inside the soil. Through the soil-water characteristic curve, many important properties of the soil can be reflected, such as: strength, volume change, stress state, permeability, etc. For a specific soil sample, the void ratio is the main factor affectin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G01N3/36
Inventor 孙文静孙德安
Owner SHANGHAI UNIV
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