Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Test device and test method for horizontal stress of compacted soil

A technology of horizontal stress and test device, applied in the direction of measuring device, force/torque/work measuring instrument, instrument, etc., can solve the problems of large test error, low precision, matching error, etc., to achieve small test error, high precision, weakening effect of error

Pending Publication Date: 2019-02-19
SOUTHWEST JIAOTONG UNIV
View PDF0 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing problems are: there are differences in physical and mechanical properties between the earth pressure cell and the surrounding soil, and the earth pressure cell will inevitably cause stress concentration and stress redistribution in the surrounding soil at a short distance during the embedding process, which changes the soil's physical and mechanical properties. The initial stress field, resulting in a matching error, resulting in a large test error; second, the output value of the earth pressure cell is easily affected by temperature, humidity, embedment angle, etc., which also makes the test error large; third, in order to reduce the matching error, the soil The volume of the pressure cell is small, and it can only measure the local stress state in the soil. However, the soil itself is an uneven material, so the accuracy of the test results is relatively low.

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
  • Test device and test method for horizontal stress of compacted soil
  • Test device and test method for horizontal stress of compacted soil
  • Test device and test method for horizontal stress of compacted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0030] Figure 1~3 Shown, a kind of embodiment of the present invention is, a kind of compacted soil horizontal stress testing device, its composition is:

[0031] The rigid and rectangular limit box 100 with the upper part open is placed on the bottom plate 401 of the reaction rigid frame 400; the left and right half cylinders 201 constitute the sample cylinder 200 with an inner circle and an outer square, and the sample cylinder 200 is located at the limit position. inside the box 100, and the outer wall of the sample cylinder 200 is not in contact with the inner wall of the limit box 100; the bottom of the inner cavity of the half-tube 201 is provided with a semicircular half backing plate 202; The bottom of the backing plate 202 and the sample cylinder 200 is provided with an upper chute matching the chute, and a ball 500 is placed between the upper chute and the chute; the top of the half cylinder 201 is provided with a half casing 300, and the left and right two Two hal...

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 provides a test device and a test method for a horizontal stress of compacted soil. The device comprises a limiting box, a sample barrel, a pressing device, and a load sensor. The limiting box is a rigid, rectangular box made of a steel plate with an open upper part. The sample barrel and a protective tube are hollow cuboid wherein the interior is rounded and the outside is square. The sample barrel and a half-pad are in contact with the bottom plate of the limiting box through a ball chute structure, and the two sides of the moving direction are respectively in contact with a sample barrel limit bolt and a load sensor. A half-pad and a half-spacer for reducing a hoop effect are arranged at both ends of the soil sample. The half-pad and the half-spacer are composed of two semicircular metal plates with the same radius. A soil sample layer preparation height is precisely controlled by the half-spacer and a limit block. The contact point of the load sensor is located at thecenter of the outer wall of a half-barrel. The total horizontal pressure of the compacted soil sample taken by the inner wall of the sample barrel is measured by the load sensor, and the horizontal stress is calculated. The error of the horizontal stress value of the compacted soil measured by the device is small, which can provide a more reliable and accurate stress basis for the design, construction and maintenance of embankment filling.

Description

technical field [0001] The invention relates to a testing device and a testing method for the horizontal stress of compacted soil in geotechnical engineering. Background technique [0002] In recent years, the construction of my country's high-speed railway is extending to the hills and mountainous areas in the central and western regions. In order to make full use of the filler resources in the mountainous areas, it is inevitable to fill a certain amount of high embankments. However, the survey shows that the high fill embankment often has the problems of settlement deformation of embankment and slope instability due to the substantial increase of fill load. In order to solve the problems of settlement deformation and slope instability of the fill, it is necessary to measure the stress of the fill in the embankment in the compacted state during the design, construction and maintenance of the embankment fill. [0003] The stress test method of the existing subgrade filling ...

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
IPC IPC(8): G01L5/00
CPCG01L5/00Y02A10/23
Inventor 罗强刘宏扬周鑫刘刚程明余浩李傲赢吴鹏秦浩锋叶欢
Owner SOUTHWEST JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products