Test method for shear strength of coarse-grained soil under different hydraulic gradients
A technology of hydraulic gradient and shear strength, which is applied in the direction of testing the strength of materials by applying a stable shear force, and can solve problems such as landslides, shear devices or rock testing machines.
Active Publication Date: 2017-09-29
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
View PDF8 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0024] Embodiment: The shear strength test method of coarse-grained soil under the action of hydraulic gradient 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, mak...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The method for testing the shear strength of coarse-grained soil under different hydraulic gradients is characterized in that a test device is used to test the shear strength of coarse-grained soil under different hydraulic gradients. The device includes a reaction frame (1), a loading frame ( 2), the first servo motor (3), the second servo motor (4), the sample loading platform (5), the upper shear box (6), the lower shear box (7), the rail car (8), the first Vertical slide rail (10), horizontal slide rail (17), dowel bar (20), horizontal loading shaft (22), vertical loading shaft (25) etc. The equipment used in this method is simple to manufacture, has high measurement accuracy, meets the requirements of consolidation and direct shear tests under different vertical stress loading and hydraulic gradient conditions, can carry out strain-controlled or stress-controlled loading, and can be used in various civil engineering Various rock and soil bodies include coarse-grained soil, gravel soil, soil-rock mixture, and the shear strength index test of soil under different hydraulic gradient seepage.
Description
technical field [0001] The invention relates to a geotechnical testing method, which belongs to the field of civil engineering or geological engineering 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, co...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/24
Inventor 李志清周应新汪永林樊思林陈武钱坤张晓锋钱正富杨俊宏
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI