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Geotechnical oblique shear strength test apparatus considering seepage flow impact

A technology of strength testing and oblique shearing, which is applied in the direction of using a stable shearing force to test the strength of materials, can solve the problems of shearing device or rock testing machine, landslides and other problems, and achieves simple manufacturing and high measurement accuracy. Effect

Active Publication Date: 2015-12-02
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

Affected by rainfall, coarse-grained soil slopes may have landslide risks, so it is very important to consider the impact of rainfall seepage on slope stability. Currently, the test of coarse-grained soil strength under the influence of seepage cannot be performed by traditional soil mechanics shearing devices. Or rock testing machine to complete, it is necessary to develop a new type of instrument suitable for the characteristics of coarse-grained soil to measure its mechanical strength, especially to consider the influence of seepage and size effects on the strength of coarse-grained soil

Method used

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  • Geotechnical oblique shear strength test apparatus considering seepage flow impact
  • Geotechnical oblique shear strength test apparatus considering seepage flow impact
  • Geotechnical oblique shear strength test apparatus considering seepage flow impact

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Experimental program
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Embodiment

[0024] Embodiment: coarse-grained soil shear strength measurement method is as follows,

[0025] ①According to water content 15%, stone content 20% and density 1.9g / cm 3 Requirements, weigh the soil body, gravel and water of corresponding quality, mix the soil body, gravel and water evenly to become a mixture, and divide it into three uniform parts for later use;

[0026] ②Move the rail car 8 to the sample loading platform 5, align the upper shear box 6 with the lower shear box 7 via the ball shaft row 12, put the first mixture into the lower shear box 7, and place the pressure plate 26 is placed on the mixture, the rail car 8 is moved to just below the vertical loading shaft 25, the first jack 15 and the second jack 19 are started, and the first supporting base 16 and the second supporting base 18 are respectively connected to the loading Contact the frame 2 to make the rail car 8 suspended in the air, start the first servo motor 3, make the vertical loading shaft 25 contact...

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Abstract

The invention relates to a geotechnical oblique shear strength test apparatus considering seepage flow impact. The geotechnical oblique shear strength test apparatus is characterized by comprising a reaction frame (1), a loading frame (2), a first servo motor (3), a second servo motor (4), a sample loading table (5), an upper shear box (6), a lower shear box (7), a rail trolley (8), a first vertical sliding rail (10), an upper box sample (11), a ball shaft row (12), a lower box sample (14), a horizontal sliding rail (17), a horizontal loading shaft (22), a vertical loading shaft (25), a second vertical sliding rail (30) and the like. According to the present invention, the apparatus is simple to manufacture, the measurement precision is high, the consolidation and oblique shear test requirement under different vertical stress loading and hydraulic gradient conditions can be met, the strain control type or stress control type loading can be performed, and the method can be used for the direct shear strength index obtaining of various rock soil bodies including coarse-grained soil, gravel soil, soil-stone mixing bodies and soil bodies encountered in the civil engineering or geological engineering under the seepage flow effect.

Description

technical field [0001] The invention relates to a geotechnical testing instrument, which belongs to the field of civil engineering instrument testing. Background technique [0002] Coarse-grained soil (gravel soil, soil-rock mixture) is a geological body composed of gravel or block stones as aggregates and clay and sand as filling materials. Coarse-grained soil is widely used as a filler in construction projects such as earth-rock dams, roads, railways, airports, and house foundations, with a wide range of applications. Coarse-grained soil is composed of rock and soil, and the mechanical properties of the two show two extreme differences of "extremely strong" (block) and "very weak" (soil). This difference makes coarse-grained soil exhibit extreme inhomogeneity and extreme nonlinear characteristics in physical and mechanical properties, and its macroscopic physical and mechanical properties cannot be simply superimposed by rocks or soil. Affected by rainfall, coarse-graine...

Claims

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Application Information

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IPC IPC(8): G01N3/24
Inventor 李志清胡瑞林
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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