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

A strength test, true triaxial technology, applied in the direction of measuring device, using stable tension/pressure test material strength, permeability/surface area analysis, etc., can solve the problem of inability to truly reflect the soil strength and seepage characteristics, and the deviation of test results , the small size of the test soil sample, etc., to achieve the effects of reducing the influence of boundary effects, widening the research range, and improving the test stress level

Inactive Publication Date: 2018-05-04
HENAN POLYTECHNIC UNIV
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are false triaxial test and true triaxial test in the soil strength test, but there are the following disadvantages: the false triaxial test cannot measure the strength of the soil under three-dimensional unequal pressure, which is not different from the actual engineering soil force; The triaxial test uses two pairs of flexible lateral pressurized water bladders to apply unequal lateral pressures, which is likely to cause distortion of the soil sample and cause large deviations in test results. The impact of the test results on the lateral pressurized rubber bladder is very thin, so the lateral pressure cannot be too large; when the rubber bladder is thicker, the force causing the expansion of the rubber bladder can no longer be ignored, and a large error will be introduced
) makes the test stress level low, and it is impossible to carry out the deformation and strength characteristics test of deep soil under high stress state, and there are few related test devices for studying the stress state on soil seepage characteristics, and the test soil sample size is small, and the boundary effect The impact of large, can not truly reflect the soil strength and seepage characteristics

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A true triaxial seepage characteristics and strength test device for large-scale soil samples
  • A true triaxial seepage characteristics and strength test device for large-scale soil samples

Examples

Experimental program
Comparison scheme
Effect test

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08G01N3/08
Inventor 王云飞郑晓娟赵洪波焦华哲陈峰宾
Owner HENAN POLYTECHNIC UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap