Method for detecting shear strength of clayey soil through large on-site direct shear test device
A technology of shear strength and test device, which is applied in the direction of using a stable shear force to test the strength of materials, etc., can solve the problems of not comprehensively reflecting the true strength of cohesive soil, limited applicable occasions, and inability to detect samples. Stable force application, improved safety and small footprint
Active Publication Date: 2014-11-12
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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Abstract
The invention discloses a method for detecting the shear strength of clayey soil through a large on-site direct shear test device. The method comprises the following steps that firstly, a test site is flattened, and a sample with the same size as a sample box is obtained by cutting; secondly, a force bearing frame base is placed and anchored; thirdly, a lateral force-measurement jack and a lateral displacement dial gauge are arranged, an initial value of the lateral displacement dial gauge is recorded, the lateral force-measurement jack is connected with a lateral hydraulic pump through a lateral pressure gauge, and a pointer of the lateral pressure gauge returns to zero; fourthly, lateral loads are applied continuously in a graded mode, lateral displacement and lateral pressure values are recorded, and deformation situations of the soil around the test box are observed; fifthly, after multiple direct shear tests under different types of pressure are finished, a shear stress-lateral displacement relation curve chart is drawn, and shear stress is determined. The method has the advantages of being convenient to implement, capable of effectively and truly obtaining data of the shear strength of the clayey soil and applicable to various sites, and can be widely applied to the technical field of clayey 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
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