The Method of Measuring the Shear Strength of Cohesive Soil Using Large-Scale Direct Shear Test Device on Site
A shear strength and testing device technology, applied in the direction of using a stable shear force to test the strength of materials, can solve the problems of not fully reflecting the true strength of the cohesive soil, inability to test samples, and limited application occasions. Stable force application, small footprint, and improved safety
Active Publication Date: 2016-08-24
CHANGJIANG SURVEY PLANNING DESIGN & RES +1
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Problems solved by technology
[0003] Due to the limitation of the sample selection in the current indoor test, there are many factors affected by man-made and weather, the samples are mostly soil blocks, and the volume is small, easy to disturb, while the vertical shear test device used in the existing large Stacking not only takes up a lot of space, but also is prone to accidents. Therefore, it cannot fully reflect the real strength of cohesive soil
At the same time, the existing large-scale direct shear test device can only detect samples on the horizontal ground but cannot detect samples on slopes, and the applicable occasions are limited
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[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, but these embodiments should not be construed as limiting the present invention.
[0022] see Figure 1 to Figure 2 , the present invention utilizes the method for detecting the shear strength of cohesive soil by a large-scale direct shear test device on site, and involves ground anchor 1, load-bearing frame seat 2, transverse force beam 3, bolt 4, stud 5, sample box 6, lower plate 7a, upper plate 7b, roller 8, vertical hydraulic pump 9, vertical pressure gauge 10, vertical force measuring jack 11, vertical displacement indicator 12, lateral hydraulic pump 13, lateral pressure gauge 14, lateral Force measuring jack 15, lateral displacement indicating table 16 and fixed support 17.
[0023] The sample box 6 is used to place the cohesive soil sample to control the force of the sample. The length, width and height of the sample box 6 are respectiv...
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The invention discloses a method for detecting the shear strength of cohesive soil by using a large-scale direct shear test device on site. Anchor the load-bearing frame seat; step 3, set the lateral force measuring jack and the lateral displacement indicator, and record the initial value of the lateral displacement indicator; connect the lateral force measuring jack with the lateral hydraulic pump through the lateral pressure gauge, and The pointer of the lateral pressure gauge returns to zero; step 4, graded and continuously applied lateral loads, recorded the lateral displacement and lateral pressure values, and observed the deformation of the soil around the sample box; step 5, completed multiple tests under different pressures After the direct shear test, draw the shear stress-lateral displacement relationship curve to determine the shear stress. The invention has the characteristics of convenient operation, can obtain the data of cohesive soil shearing strength truly and effectively, and is suitable for various sites, and can be widely used in the technical field of cohesive soil detection.
Description
technical field [0001] The invention relates to the technical field of cohesive soil detection, in particular to a method for detecting the shear strength of cohesive soil by using an on-site large-scale direct shear test device. Background technique [0002] In engineering geological survey and engineering construction, in order to obtain the shear strength value of cohesive soil, it is necessary to use instruments to test it. [0003] Due to the limitation of the sample selection in the current indoor test, there are many factors affected by man-made and weather, the samples are mostly soil blocks, and the volume is small, easy to disturb, while the vertical shear test device used in the existing large Stacking not only takes up a lot of space, but also is prone to accidents. Therefore, it cannot fully reflect the real strength of cohesive soil. At the same time, the existing large-scale direct shear test device can only detect samples on the horizontal ground but cannot ...
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IPC IPC(8): G01N3/24
Inventor 阳云华赵旻强鲁斌赵鑫朱瑛洁张良平麻斌耿军民
Owner CHANGJIANG SURVEY PLANNING DESIGN & RES