A true triaxial seepage characteristics and strength test device for large-scale soil samples

Abstract

The invention discloses a large-scale soil sample true triaxial seepage characteristic and strength test device, which comprises a frame, which consists of a test frame base (28) arranged parallel to each other, a rigidity test pressurized platform (23) and a rigid The pressurized reaction force frame beam (22) is composed of, wherein, the described test frame base (28) is connected and fixed by the base column (27) between the rigid test pressurized platform (23), and the described rigid test pressurized platform (23) is connected and fixed with the rigid pressurization reaction frame crossbeam (22) by four rigid pressurization reaction frame columns (21) respectively positioned at its four sides, on the described rigidity test pressurization platform (23) A pressure chamber a is provided. The invention can well study the soil deformation and strength change problems caused by foundation pit excavation and unloading, and is especially suitable for unloading confining pressure test of deep soil.

Description

technical field

[0001] The invention relates to the fields of civil engineering and water conservancy engineering, in particular to a true triaxial seepage characteristic and strength test device for large-scale soil samples. Background technique

[0002] With the construction of large-scale civil and water conservancy projects, the scope of engineering body force influence gradually involves the deep surface soil section, and the force state is becoming more and more complex. Therefore, the stability of the project during the construction process and the groundwater level changes in the later period will cause foundation problems. Factors such as settlement deformation and seepage that lead to changes in soil strength can easily cause engineering problems. And summer rains lead to natural disasters such as landslides and mudslides in mountainous areas, destroying towns, villages, blocking traffic, causing property losses and casualties. These are the failure to scientifica...

Examples

Embodiment 1

[0025] see Figure 1-2 , it comprises frame, and this frame is made up of test frame base 28 that is arranged parallel to each other, rigid test pressurized platform 23 and rigid pressurized reaction frame crossbeam 22, wherein, described test frame base 28 and rigid test pressurized The platforms 23 are connected and fixed by the base column 27, and the rigid test pressurized platform 23 and the rigid pressurized reaction frame crossbeam 22 are connected and fixed by four rigid pressurized reaction frame columns 21 respectively located at its four sides , the pressure chamber a is set on the rigid test pressurized platform 23;

[0026] The pressure chamber a includes an earth pressure chamber y-directed fixed side plate 4 and an adjacent earth pressure chamber x-directed fixed side plate 5, and the earth pressure chamber y-directed fixed side plate 4 and the earth pressure chamber x-directed The fixed side plates 5 are respectively fixed on the columns 21 of the rigid pressu...

Embodiment 2

[0034] When carrying out the true triaxial strength test of large-scale soil samples, put the soil sample 1 into the rubber mold (drainage and seepage tests put the soil sample into the rubber membrane with the lower opening, and the undrained test put the soil sample into the rubber membrane with the lower part closed). film), and then put it on the bottom permeable stone 7, start the x-direction horizontal pressure plate driver 9 and the y-direction horizontal pressure plate driver 31 to respectively drive the x-direction laterally shrinkable pressure plate 2 and the y-direction laterally retractable The pressure plate 3 is in close contact with the side surface of the sample 1, and then the vertical pressure driver 13 is started to make the top pressure plate 6 contact the upper surface of the soil sample 1, and the x-direction deformation tester 11 and the y-direction deformation tester 11 are adjusted. Instrument 33 and vertical deformation tester 14 make it in good contac...

Embodiment 3

[0036] When carrying out a triaxial test with different water contents and equal confining pressure on a large-scale soil sample, first drive the x-direction horizontal pressure plate driver 9, the y-direction horizontal pressure plate driver 31 and the vertical pressure driver 13 simultaneously to make the three-way pressure When the same value is reached, soil sample 1 is consolidated under hydrostatic pressure. After the consolidation is completed, the vertical presser 13 is turned on to drive the top presser plate 6 until the soil sample 1 reaches the failure condition, and the deformation and stress of the soil sample 1 are recorded by the data acquisition system 30 during the whole process.

technical field

[0001] The invention relates to the fields of civil engineering and water conservancy engineering, in particular to a true triaxial seepage characteristic and strength test device for large-scale soil samples. Background technique

[0002] With the construction of large-scale civil and water conservancy projects, the scope of engineering body force influence gradually involves the deep surface soil section, and the force state is becoming more and more complex. Therefore, the stability of the project during the construction process and the groundwater level changes in the later period will cause foundation problems. Factors such as settlement deformation and seepage that lead to changes in soil strength can easily cause engineering problems. And summer rains lead to natural disasters such as landslides and mudslides in mountainous areas, destroying towns, villages, blocking traffic, causing property losses and casualties. These are the failure to scientifica...

Examples

Embodiment 1

[0025] see Figure 1-2 , it comprises frame, and this frame is made up of test frame base 28 that is arranged parallel to each other, rigid test pressurized platform 23 and rigid pressurized reaction frame crossbeam 22, wherein, described test frame base 28 and rigid test pressurized The platforms 23 are connected and fixed by the base column 27, and the rigid test pressurized platform 23 and the rigid pressurized reaction frame crossbeam 22 are connected and fixed by four rigid pressurized reaction frame columns 21 respectively located at its four sides , the pressure chamber a is set on the rigid test pressurized platform 23;

[0026] The pressure chamber a includes an earth pressure chamber y-directed fixed side plate 4 and an adjacent earth pressure chamber x-directed fixed side plate 5, and the earth pressure chamber y-directed fixed side plate 4 and the earth pressure chamber x-directed The fixed side plates 5 are respectively fixed on the columns 21 of the rigid pressu...

Embodiment 2

[0034] When carrying out the true triaxial strength test of large-scale soil samples, put the soil sample 1 into the rubber mold (drainage and seepage tests put the soil sample into the rubber membrane with the lower opening, and the undrained test put the soil sample into the rubber membrane with the lower part closed). film), and then put it on the bottom permeable stone 7, start the x-direction horizontal pressure plate driver 9 and the y-direction horizontal pressure plate driver 31 to respectively drive the x-direction laterally shrinkable pressure plate 2 and the y-direction laterally retractable The pressure plate 3 is in close contact with the side surface of the sample 1, and then the vertical pressure driver 13 is started to make the top pressure plate 6 contact the upper surface of the soil sample 1, and the x-direction deformation tester 11 and the y-direction deformation tester 11 are adjusted. Instrument 33 and vertical deformation tester 14 make it in good contac...

Embodiment 3

[0036] When carrying out a triaxial test with different water contents and equal confining pressure on a large-scale soil sample, first drive the x-direction horizontal pressure plate driver 9, the y-direction horizontal pressure plate driver 31 and the vertical pressure driver 13 simultaneously to make the three-way pressure When the same value is reached, soil sample 1 is consolidated under hydrostatic pressure. After the consolidation is completed, the vertical presser 13 is turned on to drive the top presser plate 6 until the soil sample 1 reaches the failure condition, and the deformation and stress of the soil sample 1 are recorded by the data acquisition system 30 during the whole process.

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