Multi-boundary-condition dilatometer and soil expansion test method

A boundary condition and dilatometer technology, which is applied in the field of laboratory experiments, can solve the problems of complicated operation of boundary condition control methods, lack of consideration of flexible boundary conditions, and easy to be affected by human factors, and achieves a wide range of instruments, reliable data, and real-time measurement. Effect

Active Publication Date: 2016-08-24
NANJING UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] (1) Only the two extreme boundary conditions of constant stress and constant volume are considered, but the flexible boundary conditions widely existing in practical engineering are not considered;
[0008] (2) The commonly used boundary condition control methods are complex to operate and are easily affected by human factors;
[0009] (3) Boundary conditions cannot be converted during the test
[0010] After searching, the Chinese patent application number 201510322064.8, the application date is June 2, 2015, and the name of the invention is: two-dimensional dilatometer for expansive soil; the application includes a test bench and a pressure chamber set on the test bench, the pressure chamber is A square tubular structure with openings at the left and right ends surrounded by the bottom plate, the top plate, the front splint and the rear splint, which are arranged alternatel

Method used

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  • Multi-boundary-condition dilatometer and soil expansion test method

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Experimental program
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Embodiment 1

[0056] combine figure 1 with figure 2 ( figure 2 from the perspective of figure 1 Looking at the right side of the past), a dilatometer with multiple boundary conditions in this embodiment includes a lower support platform, an upper fixed frame, a boundary condition simulation mechanism, a measurement mechanism, and a sample loading chamber 7. The upper fixed frame, boundary condition simulation The mechanism and the sample loading chamber 7 are all installed on the lower support platform, and the measuring mechanism is installed in the upper fixed frame.

[0057] The lower support platform includes a lower frame 1 and a lower platform 2, the lower frame 1 is an iron frame supported by four legs, the upper and lower surfaces of the lower platform 2 are respectively fixed with the sample loading platform 3 and the lower frame 1 by screws, and the lower frame The main function of 1 is to support the lower platform 2 and other upper structures, and the main function of the l...

Embodiment 2

[0074] A multi-boundary condition dilatometer of this embodiment is basically the same as that of Embodiment 1, the difference being that this embodiment controls the rigid plate 11, The U-shaped limit rod 13 and the force ring 14 are movable or fixed, so as to realize free switching among the three boundary conditions. The following describes the specific operation of the expansion test under multiple boundary conditions in this embodiment in combination with the test path of "constant stress-equal stiffness flexibility-constant volume":

[0075] (1) Prepare the ring knife sample, put it into the sample loading chamber 7, and then place the sample loading chamber 7 on the sample loading platform 3;

[0076] (2) control the first adjusting nut 10 to be in a free state, and control the second adjusting nut 16 to be in a fixed state, so that the boundary simulation device of the instrument is switched to a constant stress condition;

[0077] (3) Adjust the counterweight 6 so th...

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Abstract

The invention discloses a multi-boundary-condition dilatometer and a soil expansion test method. The multi-boundary-condition dilatometer comprises a lower supporting platform, an upper fixed frame, a boundary condition simulating mechanism, a sample carrying chamber and a measuring mechanism. The upper fixed frame, the boundary condition simulating mechanism and the sample carrying chamber are all mounted on the lower supporting platform, and the measuring mechanism is mounted in the upper fixed frame. An equal-rigidity flexible boundary simulating unit is designed, meanwhile, a constant-size and constant-stress boundary simulating unit is integrated, and compared with a traditional dilatometer, a test can be carried out under multiple boundary conditions, and the influence of the boundary conditions on the expansion performance of soil is analyzed. Different test paths can be designed, and the influence of the test paths on the expansion performance of soil can be analyzed. A sensing measuring device and a data collecting device are adopted, testing precision is high, and data collecting are convenient. The device is simple and novel in structure, easy and convenient to operate, small in influence from human factors, low in cost and reliable in data.

Description

technical field [0001] The invention belongs to the technical field of laboratory tests in geotechnical engineering and geological engineering, and more specifically relates to a dilatometer and a soil body capable of simulating different boundary conditions (constant stress, constant volume and equal stiffness) and freely designing test paths Swell test method. Background technique [0002] Expansive soils are widely distributed in various regions of the world. Due to geographical constraints, many buildings have to be built on expansive soil foundations. In recent years, under the influence of extreme climate, engineering accidents caused by foundation damage due to water absorption and swelling deformation of soil often occur, which has a great impact on people's property safety. On the contrary, taking advantage of the special properties of expansive soil, the buffer / backfill materials mainly composed of bentonite can also be used in anti-seepage structures of special ...

Claims

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Application Information

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IPC IPC(8): G01N19/00
CPCG01N19/00
Inventor 唐朝生陈志国徐士康王德银王鹏孙凯强施斌
Owner NANJING UNIV
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