Method and device for preparing tri-axial test samples including sandwich layers
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A triaxial test and interlayer technology, applied in the preparation of test samples, etc., can solve problems such as difficult control of crack thickness, inclination and position
Inactive Publication Date: 2013-01-09
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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The existing sample preparation methods generally use a single soil sample to compact or use the undisturbed soil sample to cut to form a columnar body. The former can only produce samples with uniform materials, while the latter can take advantage of the inhomogeneity of the undisturbed soil to cut out cracks. undisturbed sample, but it is difficult to control the thickness, inclination and position of the crack
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Embodiment 1
[0050] Contain the method for sample preparation of interlayer triaxial test sample, its steps are:
[0051] The following is to make the main material of the lower part of a sample: soil sample A, passed through a 2mm sieve, with a water content of 20% and a density of 1.8g / cm 3 Medium expansive soil, a kind of interlayer material: interlayer soil sample B, passed through a 2mm sieve, with a water content of 23%, and a density of 1.6g / cm 3 Strong expansive soil, a main material of the upper part of the sample: soil sample C, passed through a 2mm sieve, with a water content of 18% and a density of 1.7g / cm 3 The medium expansive soil, the interlayer is located in the center of the cylindrical sample, the thickness of the interlayer is 10mm, and the sample preparation method of the interlayer with an inclination angle of 30 degrees is taken as an example to illustrate the specific operation process of this device. See the attached manual for the sample effect Figure 9 .
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Embodiment 2
[0064] The present invention will be described in further detail below according to accompanying drawing:
[0065] Triaxial test sample device with interlayer, which consists of sample preparation mold fixing screw 1, sample preparation mold fixing nut 2, upper general sample preparation mold 3, upper inclined section sample preparation mold 4, lower inclined section sample preparation mold 5, lower Universal sample preparation mold 6, mold fixing bracket 7, sample preparation base 8, sample push rod fixed base 9, trapezoidal tooth sample push screw 10, sample push rod positioning scale 11, sample push rod positioning mark 12, The sample pushing rod is driven by a wrench 13, a cushion block 14, a soil sample A15, an interlayer soil sample B16, and a soil sample C17.
[0066]It is characterized in that: the base 7 of the sample preparation device is a gate-shaped structure welded by steel plates, the top plate of the base of the sample preparation device is 16 mm thick, and the...
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Abstract
The invention discloses a method and a device for preparing tri-axial test samples including sandwich layers. The method includes the steps: (1) turning a trapezoidal-thread sample leading-screw to a zero scale position; (2) filling a soil sample A into an assembled sample preparation mould and compacting by impact; (3) turning the leading-screw; (4) loosening sample preparation mould fixing nuts; (5) turning an ejector rod to enable the sample ejector rod to move an expected sandwich layer thickness downwards; (6) loosening sample preparation device screw top nuts; and (7) turning the sample leading-screw so that a sample is pushed out. The device comprises a sample preparation device base, the trapezoidal-thread sample leading-screw, a leading-screw distance measurement device, a leading-screw drive wrench, sample preparation mould fixing screws, an upper universal sample preparation mould, a lower universal sample preparation mould, an upper inclined-section sample preparation mould and a lower inclined-section sample preparation mould. By the method and the device, mixed sample preparation with different materials can be carried out, the tri-axial samples including the sandwich layers in different inclination angles can be prepared, and the thickness of the sandwich layers and the spatial positions of the sandwich layers in the whole samples can be controlled.
Description
technical field [0001] The present invention relates to the technical field of sample preparation for geotechnical triaxial experiments, more specifically to a sample preparation method for triaxial test samples containing interlayers, and also to a sample preparation device for triaxial test samples containing interlayers. The present invention It is suitable for the study of the mechanical properties of expansive soil and red clay with interlayers and cracks. It can fill the gap that the current conventional sample preparation methods cannot make triaxial samples with interlayers, and can control the inclination angle, position and thickness of interlayers. The research and understanding of the influence of cracks and interlayers in soil on the mechanical properties of soil provides technical support. Background technique [0002] The strength parameter of the soil is the key parameter that determines the safety and design of geotechnical engineering. The triaxial test cha...
Claims
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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
Inventor 罗红明陆定杰陈善雄许锡昌
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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