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Ring knife, measuring device and method for lateral expansion force of soil containing the ring knife

A technology of lateral expansion and measurement method, which is applied in the direction of measuring device, force/torque/work measuring instrument, and using stable tension/compression to test the strength of materials, etc., which can solve the problem of high cost, time-consuming and labor-intensive testing, and unconsidered elimination Problems such as over-consolidation horizontal stress, to achieve accurate results and eliminate significant effects

Active Publication Date: 2018-03-20
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the model box has problems such as difficulty in model making, time-consuming and labor-intensive testing, and the servo device also imposes side restrictions on the soil sample, which does not meet the actual working conditions, and there is also the problem of high cost.
More importantly, the devices and methods involved in testing the expansion force in the past did not take into account the elimination of the over-consolidation horizontal stress generated during the sample preparation process.

Method used

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  • Ring knife, measuring device and method for lateral expansion force of soil containing the ring knife
  • Ring knife, measuring device and method for lateral expansion force of soil containing the ring knife
  • Ring knife, measuring device and method for lateral expansion force of soil containing the ring knife

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] See attached Figure 10, a soil lateral expansibility test device, said device adopts a special ring knife and upper and lower matching guard blades and bases in the existing expansibility test device, and uses a thin film pressure sensor and an electronic dial gauge to realize lateral expansion. Real-time acquisition of expansion force and vertical expansion rate. The thin-film pressure sensor is attached to the groove on the inner wall of the special ring knife, and the other end is connected to the computer through the data acquisition instrument. The inner diameter of the special ring knife is 61.8mm, the height is 20mm, the thickness of the side wall is 3mm, and a groove of 20mm*20mm*1mm is reserved on one side, and the other side is cut and opened, so that it becomes a part with a thickness of 2mm and a part Lap interlock structure with a thickness of 1mm. There is a steel hoop on the outer wall, and an adjusting screw is set on the hoop to adjust the size of th...

Embodiment 2

[0068] The undisturbed soil samples and disturbed soil samples of expansive soil were collected on the Baise Expressway in Guangxi, and the basic physical property indexes and engineering property tests were carried out. The indoor test results show that the plasticity index of the expansive soil sample of Baise Expressway is 33.5%, and the free expansion rate is 63%. According to the current expansive soil identification and classification standards for highways, the soil samples taken are medium expansive soils. Adopt a kind of soil lateral expansion force test method of the present invention, carry out sample preparation to Guangxi expansive soil and carry out lateral expansion force test, concrete implementation steps are as follows:

[0069] Configure expansive soil samples with a moisture content of ω=17.6%. Take a special ring knife (including the hoop), weigh and record, fit the calibrated film pressure sensor in the groove of the ring knife, and use the method of sta...

Embodiment 3

[0084] Take the soil sample in the same state as in Example 2, take a special ring knife (including hoop), weigh and record, fit the calibrated film pressure sensor in the groove of the ring knife, and use the method of static pressing to make a sample. Take the disturbed soil specimen and control its initial dry density to 1.69g / cm 3 , to ensure that the surface of the specimen is smooth and tidy, and the initial height is 20mm.

[0085] After the static pressure is completed, read the value of the membrane pressure sensor once, at this time P h0 =335.1kPa, then the sample is taken off from the strength tester, the over-consolidation effect is released, and the reading P is stabilized h1 =201.9kPa, indicating that the over-consolidation effect produced during the static pressure process has not been fully released, so loosen the screw to open the ring knife slightly to complete the unloading of the over-consolidation stress, and then slowly tighten the screw to make the ring...

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Abstract

The invention discloses a cutting ring, and a method and a device with the cutting ring for measuring lateral swelling force of soil mass. The cutting ring is an opening cutting ring. An opening adjusting device is arranged o the outer wall of an opening of the cutting ring, and a groove for accommodating a pressure sensor is formed in the inner wall of the cutting ring. The device for measuring the lateral swelling force comprises a loaded swelling test device and a real-time pressure acquisition device. The method for measuring the lateral swelling force includes acquiring soil samples with set water contents and preparing samples under static pressures according to geo-technical test regulations for roads; eliminating over-consolidation effects realized by the samples prepared under the static pressures and then measuring the lateral swelling force of the test samples according to loaded swelling test regulations. The cutting ring, the method and the device have the advantages that the device is simple and is reasonable in structure and economical in manufacturing cost, the lateral swelling force can be conveniently measured by the aid of the device, and the problem of incapability of accurately evaluating the stability of humidified and swollen side slopes with swelling soil in the field for a long term can be solved; the lateral swelling force can be easily, conveniently and accurately measured, important design parameters can be provided for designing roads, railways, water conservation and building engineering in regions with swelling soil, and the cutting ring, the method and the device are suitable to be popularized and applied to engineering.

Description

technical field [0001] The invention discloses a ring knife, a soil lateral expansion force measuring device containing the ring knife and a soil lateral expansion force measurement method; in particular, it refers to a ring knife and supporting equipment with opening and closing functions, The invention discloses a lateral expansion force measuring device and a soil lateral expansion force measurement method for strictly eliminating the over-consolidation horizontal stress generated by statically compressed soil samples. The invention belongs to the technical field of highway expansive soil geotechnical tests. Background technique [0002] Expansive soil is rich in expansive clay minerals, which has the characteristics of swelling and softening when encountering water, shrinking and cracking due to loss of water. With the rapid development of my country's economy, the proportion of investment in infrastructure is increasing, and more and more roads will pass through the ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01L5/00
CPCG01L5/00G01N3/08
Inventor 张锐郑健龙刘正楠张博亚
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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