Unsaturated coarse-grained soil soil-water characteristic curve combined bending element measuring device

A soil-water characteristic curve, measuring device technology, used in measuring device, strength characteristics, suspension and porous material analysis, etc.

Pending Publication Date: 2020-10-23
WENZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, it is impossible to carry out unsaturated coarse-grained soil tests under controllable matrix suction in many conventional triaxial equipment. For the joint determination of modulus, there is an urgent need for a more economical soil-water characteristic curve joint bending element measurement device suitable for large-size coarse-grained soils

Method used

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  • Unsaturated coarse-grained soil soil-water characteristic curve combined bending element measuring device
  • Unsaturated coarse-grained soil soil-water characteristic curve combined bending element measuring device
  • Unsaturated coarse-grained soil soil-water characteristic curve combined bending element measuring device

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Embodiment 1

[0033] see figure 1 , figure 2 , Figure 5 , Figure 8 , Figure 11 , Figure 12 , Figure 13 , Figure 14As shown, the present invention provides an unsaturated coarse-grained soil-water characteristic curve joint bending element measurement device, which includes a metal bottom plate [1] and a metal top plate [2]. The metal bottom plate [2] is provided with 6 channels, respectively The first air hole [3], the first water inlet [4], the second water inlet [5], the third water inlet [6], the first cable hole [7], the second cable hole [8], one end opening of all channels is located on the top surface of the metal bottom plate [1], and one end opening is located on the side of the metal bottom plate [1]. The first vent hole [3] is connected to the external air pressure control system, and the first water inlet The hole [4] and the second water inlet [5] are connected to the external peristaltic pump, the third water inlet [6] is connected to the external submersible pum...

Embodiment 2

[0036] Embodiment two is the mensuration of unsaturated coarse-grained soil soil-water characteristic curve, and device installation is identical with embodiment one, and implementation method is as follows:

[0037] First, the peristaltic pump is used to saturate the sample with water through the first water inlet [4] and the second water inlet [5]. The peristaltic pump is connected with an aqueduct and a pore water volume measurement device. It is a high-precision cylinder. The end of the water guide tube is put into the measuring cylinder. The height of the measuring cylinder is lower than the orifice of the water inlet hole at the bottom. After that, the matrix suction of the sample is balanced according to the drying path, and the matrix suction is balanced each time. Then measure the displacement to obtain the actual water content of the sample under the corresponding matrix suction, and draw the soil-water characteristic curve of unsaturated coarse-grained soil.

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Abstract

The invention discloses an unsaturated coarse-grained soil soil-water characteristic curve combined bending element measuring device, which can be used for combined measurement of an unsaturated coarse-grained soil soil-water characteristic curve and a maximum shear (elastic) modulus in geotechnical engineering, and can further be used for researching the maximum shear (elastic) modulus of unsaturated coarse-grained soil under different initial stresses and matrix suction forces. The unsaturated coarse-grained soil soil-water characteristic curve combined bending element measuring device comprises a pressure chamber, an axial displacement sensor, an axial pressure control system, a confining pressure control system, an air pressure control system, a water pressure control system, a high-air-inlet-value argil plate, an argil plate saturation accessory and a piezoelectric ceramic bending element embedded in the midpoint position of a top cap and the argil plate. According to the unsaturated coarse-grained soil soil-water characteristic curve combined bending element measuring device, different (isotropic and anisotropic) initial stress states can be realized by applying axial pressure and confining pressure through utilizing air pressure; the matrix suction in a sample can accurately controlled by means of the high-air-inlet-value argil plate, the air pressure control system andthe water pressure control system, so that the measurement of a soil-water characteristic curve is realized; and the shear wave velocity or the elastic wave velocity is measured through using the piezoelectric ceramic bending element, so that the measurement of the maximum shear modulus or the elastic modulus of the unsaturated coarse-grained soil in a controllable matrix suction state is realized.

Description

technical field [0001] The invention relates to a device for measuring unsaturated coarse-grained soil-water characteristic curve combined with bending elements. Joint determination of shear (elastic) modulus, especially the determination of the maximum shear (elastic) modulus of unsaturated coarse-grained soil fillers under different initial stresses and matrix suction. Background technique [0002] Geotechnical testing is the main means to obtain the physical and mechanical parameters of soil. The national standard of the People's Republic of China "Standards for Soil Testing Methods" (GB / T 50123-1999) is the guiding specification for geotechnical testing in the field of survey and design in my country. In this specification, there is no clear measurement method of unsaturated soil, especially unsaturated coarse-grained soil water and soil characteristic curve and related physical and mechanical parameters. [0003] Unsaturated coarse-grained soil widely exists in roadbed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24G01N3/12G01N3/06G01N15/08
CPCG01N3/24G01N3/12G01N3/066G01N3/06G01N15/0826G01N15/0806G01N15/088G01N2203/0019G01N2203/0025G01N2203/0048G01N2203/0044G01N2203/0075G01N2203/0623
Inventor 谷川叶星池张婷婷董全杨王军王鹏高世虎
Owner WENZHOU UNIVERSITY
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