Dual-layer pressure plate instrument for measuring soil-water characteristic curve

A soil-water characteristic curve and double-layer technology, which is applied in the field of geotechnical engineering, can solve the problems of time-consuming and installing a soil sample, and achieve the effect of improving test efficiency and reducing test errors

Active Publication Date: 2013-12-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, such experiments are time-consuming
The general soil-water characteristic curve pressure plate instrument can only install one soil sample in one test.

Method used

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  • Dual-layer pressure plate instrument for measuring soil-water characteristic curve
  • Dual-layer pressure plate instrument for measuring soil-water characteristic curve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] have as figure 1 The assembled double-layer pressure plate apparatus shown is capable of carrying out soil-water characteristic curve tests.

[0030] Clay plate saturation: first, saturate the clay plate base 13 with high air intake value on the upper layer and the clay plate base 20 on the lower layer with high air intake value. Take off the pressure chamber cover 17, put the pressure plate instrument reaction force frame structure (including the pressure chamber upper cover 7, the pressure chamber upper cover lock nut 8, the upper layer high air intake value clay plate base 13, the upper layer high air intake value clay plate Base lock nut 14, pressure chamber pull rod 15, lower floor high air intake value clay plate base lock nut 18 and lower floor high air intake value clay plate base 20) were put into anaerobic water for 4 hours; then the upper layer high air intake value The first water-stop boss of the clay plate base 13 and the second water-stop boss 30 of the ...

Embodiment 2

[0037] have as figure 1 The assembled double-layer pressure plate apparatus shown is capable of carrying out soil-water characteristic curve tests.

[0038] The difference from Embodiment 1 is that in Embodiment 2, the upper layer soil sample 11 on the upper high air intake value clay slab base 13 is subjected to a certain external load according to the test requirements, and the lower layer on the lower layer high air intake value clay slab base 20 Soil sample 16 is the same as the first embodiment, that is, it does not bear any external load.

[0039] Clay plate saturation: first, saturate the clay plate base 13 with high air intake value on the upper layer and the clay plate base 20 on the lower layer with high air intake value. Take off the pressure chamber cover 17, put the pressure plate instrument reaction force frame structure (including the pressure chamber upper cover 7, the pressure chamber upper cover lock nut 8, the upper layer high air intake value clay plate ba...

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Abstract

The invention discloses a dual-layer pressure plate instrument for measuring a soil-water characteristic curve, belonging to the field of geotechnical engineering techniques. The dual-layer pressure plate instrument comprises a support base, wherein a pressure chamber is arranged above the support base, an upper-layer ceramic plate base is arranged in the pressure chamber; a pressure chamber upper cover, the upper-layer ceramic plate base and a lower-layer ceramic plate base are connected through a pull rod and a locking nut; a groove is formed in the top of the upper-layer ceramic plate base, a ceramic plate is arranged in the groove, a trough is formed in the upper-layer ceramic plate base below the ceramic plate, a water inlet and a water outlet of the trench are respectively connected with a volume change pipe, a soil sample cutting ring is arranged above the ceramic plate, a metal permeable plate is arranged above an upper-layer soil sample; a groove is formed in the top of the lower-layer ceramic plate base, a ceramic plate is arranged in the groove, a trough is formed in the lower-layer ceramic plate base below the ceramic plate, a water inlet and a water outlet of the trough are respectively connected with a volume change pipe, a soil sample cutting ring is arranged above the ceramic plate; the lower end of a dowel bar is arranged above the metal permeable plate through a through hole in the pressure chamber upper cover, and the pressure chamber is communicated with an air pressure pipeline.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, in particular to a double-layer pressure plate instrument used for measuring the soil-water characteristic curve of unsaturated soil, which can test two soil samples under different load conditions. Background technique [0002] The soil-water characteristic curve, also known as the soil water retention curve, expresses the relationship between the water content of the soil and the water retention capacity of the soil. The soil-water characteristic curve is related to the type of soil, void ratio and salinity. Early soil and plant scientists used soil-water characteristic curves to study the competition between the stagnant water potential of soil and the water absorption potential of plant roots. Later, geotechnical engineering scientists began to pay attention to the mechanical behavior of unsaturated soil, and the soil-water characteristic curve became a useful tool to study ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
Inventor 张希巍冯夏庭李元辉杨成祥徐荃陈天宇
Owner NORTHEASTERN UNIV
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