Unsaturated soil anisotropic consolidation test device

A consolidation test and isobaric technology, applied in measuring devices, using stable tension/pressure testing materials, instruments, etc., can solve the problem of inaccurate measurement of the volume change of the test sample, and achieve a high degree of automation and easy operation. , the effect of simple principle

Inactive Publication Date: 2012-07-04
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the existing instruments that cannot correctly measure the volume change of the sample d...

Method used

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  • Unsaturated soil anisotropic consolidation test device
  • Unsaturated soil anisotropic consolidation test device
  • Unsaturated soil anisotropic consolidation test device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] see Figure 1 to Figure 5 , the isotropic isotropic consolidation test device for unsaturated soil, comprising an inner pressure chamber (7), an outer pressure chamber (4), a device base (13) and a volume change measurement device (9), characterized in that: the inner The upper end of the pressure chamber (7) is connected with the volume change measuring device (9), and the lower end of the inner pressure chamber (7) is connected with the device base (13) and is padded with a rubber ring (18), and fixed by a bracket (6); The upper and lower ends of the outer pressure chamber are respectively connected with an upper cover (1) of the outer pressure chamber and the base (13) of the device, and the connecting parts are sealed with a layer of rubber rings (18); the base of the device (13) is embedded with A clay plate (14), the sample (12) is on the clay plate (14), a sample cap (10) is arranged on the sample (12), and a permeable stone (10) is arranged in the sample cap (10...

Embodiment 2

[0024] This embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0025] Both the upper surface of the device base (13) and the lower surface of the outer pressure chamber upper cover (1) have rubber ring grooves (24), which match the inner and outer pressure chamber sleeves (7, 4); The rings (18) are respectively embedded in the rubber ring grooves (24).

[0026] A threaded bracket (2) is provided on the periphery of the outer pressure chamber (4), the bracket (2) passes through the device upper cover (1) and the device base (13), and is fixed with bolts (3); The support (6) on the periphery of the internal pressure chamber (7) fixes the sleeve of the internal pressure chamber (7) through bolts (3), and its lower end is connected to the threaded support hole (23) on the device base (13).

[0027] The structure of the volume change measuring device (9) is: there is a small tank above the internal pressure chamber (7), the bottom of the s...

Embodiment 3

[0030] see Figure 1 ~ Figure 4 , The unsaturated soil isotropic isobaric consolidation instrument consists of four parts: an inner pressure chamber (7), an outer pressure chamber (4), a sample base (13) and a volume change measuring device (9). The lower end of the inner pressure chamber (7) is connected to the device base (13) with a rubber ring (18) in between, and the upper and lower ends of the outer pressure chamber (4) are respectively matched with the device base (13) and the device upper cover (1). And the joints between them are all padded with a layer of rubber rings (18); the upper surface of the device base (13) and the lower surface of the device loam cake (1) have pressure chamber grooves, which match the pressure chambers, and the rubber rings ( 18) respectively embedded in the grooves; the rubber ring (18) can prevent water and gas leakage in the outer pressure chamber after the device is sealed, and water circulation between the inner and outer pressure chamb...

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Abstract

The invention discloses an unsaturated soil anisotropic consolidation test device. The device can perform anisotropic consolidation tests under the condition of controlling a suction value of a sample according to characteristics of unsaturated soil, and measure the change conditions of volume and water content of the sample in the consolidation process. The device comprises double pressure chambers, a base, an upper cover and a volume change measuring device. The lower end of an inner pressure chamber is connected with the base, and a rubber ring is arranged between the lower end of the inner pressure chamber and the base; the upper and lower ends of an outer pressure chamber are respectively matched with the base and the upper cover, and rubber rings are arranged at the connected parts; pressure chamber grooves are formed on the upper surface of the base and the lower surface of the upper cover, and are matched with the pressure chambers, and the rubber rings are embedded in the grooves; and the rubber rings can prevent water and gas in the outer pressure chamber from leaking and water between the outer pressure chamber and the inner pressure chamber from circulating after the device is sealed. The device can easily measure the change conditions of the volume and the water content of the sample of the unsaturated soil in the anisotropic consolidation tests, has high measuring accuracy, and is simple in structure, convenient to operate, easy to master and high in automation degree.

Description

Technical field [0001] The invention relates to an unsaturated soil isotropic isotropic consolidation test device in the field of civil engineering geotechnical tests. Background technique [0002] Soil is a material composed of solid phase, liquid phase, and gas phase. The solid particles of the soil material form the pores of the soil skeleton, and liquid and gas are contained in these pores. When all the pores of the soil skeleton are filled with water, the soil is called saturated soil; when there is gas in the pores of the soil, the soil is called unsaturated soil. Soil saturation is defined as the ratio of the volume of water in the soil to the pore volume, that is, the degree to which water fills the pores in the soil. At present, many scholars have conducted a large number of experimental studies on unsaturated soil research, and summarized many constitutive models. These works have made people's understanding and understanding of the properties of unsaturated soil...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01N3/02G01N3/06
Inventor 孙德安吴波楼志军许志良仰先才
Owner SHANGHAI UNIV
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