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Loaded expanding test method and loaded expanding test apparatus

A kind of expansion test, a piece of technology, applied in the direction of measuring device, using stable tension/pressure test material strength, suspension and porous material analysis, etc., can solve the problem that the initial state cannot be determined, and achieve reasonable structure and accurate swelling Deformation value, effect of simple test method

Active Publication Date: 2016-11-09
GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the author believes that this method still ignores the compression of the soil sample during the consolidation process, and its initial state cannot be determined

Method used

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  • Loaded expanding test method and loaded expanding test apparatus
  • Loaded expanding test method and loaded expanding test apparatus
  • Loaded expanding test method and loaded expanding test apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] see attached Figure 9 , a loaded expansion test device, the loaded expansion test device is to add a permeable stone plate 2 in the existing loaded expansion test device, the diameter of the permeable stone plate 2 is greater than the diameter of the ring knife, and one side is covered by a soil sample. The upper end face and the other side of the sample 4 formed with the ring knife are connected to the cover plate 5 in the loaded expansion test device, and the diameter of the permeable stone plate 2 is at least 1mm larger than the outer diameter of the ring knife.

Embodiment 2

[0061] see attached Figure 9 , Guangxi expansive soil engineering example

[0062] The expansive soil undisturbed soil samples and disturbed soil samples were collected at the site of Baise Expressway in Guangxi, and the basic physical property indexes and engineering property tests were carried out. The laboratory test results show that the plastic index of the expansive soil sample of Baise Expressway is 33.5%, and the free expansion rate is 63%. According to the current classification standards for expansive soils of highways, the soil samples taken are medium expansive soils. By adopting a new loaded expansion test method of the present invention, samples of Guangxi expansive soil were prepared and the loaded expansion test was carried out to calculate the loaded expansion rate and the expansion deformation of the 8m high embankment filled with it as the roadbed filler. The specific implementation steps are as follows:

[0063] Expansive soil samples with a moisture co...

Embodiment 3

[0071] An example of expansive soil engineering in Anhui

[0072] The planar distribution of expansive soils in Anhui Province is relatively concentrated, most of which are weak-medium expansive soils, mainly distributed in the Huaibei Plain and Shucheng County-Chaohu City-Jianghuai Corrugated Plain to the north of Hexian County. The expansive soil expansive soil removed from the subgrade slope of the expansive soil road section is huge due to the landslide. If all the expansive soil excavated and excavated is abandoned, it will occupy a lot of valuable land resources, and will cause serious soil erosion and ecological environment damage.

[0073] Expansive soil undisturbed soil samples and disturbed soil samples were collected at the site of Anhui Expressway, and the basic physical property indexes and engineering property tests were carried out. The laboratory test results show that the plastic index of the expansive soil sample of Haitun Expressway is 25.6%, and the free e...

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Abstract

The invention relates to a loaded expanding test method and a loaded expanding test apparatus. The test method comprises: preparing a sample according to the regulation of a loaded expanding test method, placing the sample into a consolidometer, arranging a water permeable stone plate with a diameter of more than a ring cutter diameter on the upper end surface of the sample, stacking the cover plate of the consolidometer onto the water permeable stone plate, applying a set load P on the sample, and carrying out a loaded expanding test. According to the apparatus, the water permeable stone plate with the diameter of more than the ring cutter diameter is additionally arranged in the existing loaded expanding test apparatus. According to the present invention, the test method is simple, the operation is convenient, the structure is reasonable, and the measured loaded expanding rate of the expanding soil is more consistent with the actual situation by strictly controlling the initial state of the sample; and with the method and the apparatus, the technical problem that the expanding soil moisture expansion deformation capacity can be accurately evaluated in the field is solved, and the method and the apparatus are suitable for engineering application.

Description

technical field [0001] The invention discloses a loaded expansion test method and device; in particular, it refers to a loaded expansion test which strictly controls the initial state (initial moisture content and initial dry density) of the test soil sample by increasing the diameter of the permeable stone on the soil sample Test methods and apparatus. The invention belongs to the technical field of road expansive soil geotechnical testing. Background technique [0002] Expansive soil is rich in expansive clay minerals, and has obvious characteristics of water swelling and softening, water loss shrinkage and cracking. In highway construction in expansive soil areas, due to the high natural moisture content of expansive soil, which is difficult to compact and has poor water stability, the subgrade filled with expansive soil is prone to humidification and expansion during operation, decrease in dry density, and decrease in bearing capacity, resulting in early failure of the ...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N15/08
CPCG01N3/08G01N15/088G01N2203/0003G01N2203/0019G01N2203/0605G01N2203/0676G01N2203/0682
Inventor 张锐刘刚亮王欢林才奎郑健龙王中文陈杰徐一鸣方建勤雷鸣夏兼
Owner GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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