An in-situ soil external friction angle testing device and testing method
A testing device and external friction technology, which is applied to measuring devices, using stable tension/pressure to test material strength, instruments, etc. High efficiency, real and reliable test data
Active Publication Date: 2022-03-11
武汉吉欧信海洋科技股份有限公司 +1
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Problems solved by technology
The test of the external friction angle of soil is of great significance for evaluating the stability of soil, but the accuracy of the current test method of external friction angle of soil is not high, which directly leads to the external friction angle of soil being used as a parameter for evaluating soil stability. reduce
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[0026] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.
[0027] Such as Figure 1 to Figure 5 The shown in-situ soil external friction angle testing device includes a drill pipe 1, a casing 2, a connecting cylinder 3, an expansion film 4, an expansion film protection layer 5, a friction sleeve 6, a sealing sleeve 6, a mounting seat 7, and a sensor Installation cylinder 8, strain gauge pressure sensor 9, drill bit 10, annular cutting edge 11, positioning sleeve 12 and expansion film limit mechanism 13, the drill pipe 1 is arranged in the casing 2, between the drill pipe 1 and the casing 2 There is a backflow gap 15, the upper and lower ends of the ex...
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The invention discloses an in-situ soil external friction angle testing device and a testing method. The in-situ soil external friction angle testing device includes a drill pipe, a casing, a connecting tube, an expansion film, an expansion film protective layer, a sealing sleeve, a mounting seat, Sensor installation cylinder, strain gauge pressure sensor, drill bit, annular cutting edge, positioning sleeve and expansion film limit mechanism, there is a backflow gap between the drill pipe and the casing for mud return, and there is a gap between the expansion film and the connecting cylinder. The expansion gap is used to provide radial pressure on the soil. An oil chamber is formed between the lower end surface of the sensor installation cylinder and the installation seat. There is a deformation gap connected with the oil chamber between the sensor installation cylinder and the casing. The strain gauge pressure sensor It is fixedly installed on the outer facade of the sensor installation cylinder. The medium in the oil chamber is used to provide upward thrust to the test device, and the friction force between the expansion film protective layer and the soil is obtained through the strain gauge pressure sensor. The test data of the external friction angle test device is true and reliable, the test method is simple to operate, and the efficiency is high.
Description
technical field [0001] The invention relates to the technical field of in-situ soil testing, in particular to an external friction angle testing device and testing method of in-situ soil. Background technique [0002] The external friction angle of soil refers to the intersection angle between the resultant force on the shear surface and the normal line of the shear surface when the contact surface between soil and other materials undergoes shear failure (starting relative displacement). The test of the external friction angle of soil is of great significance for evaluating the stability of soil, but the accuracy of the current test method of external friction angle of soil is not high, which directly leads to the external friction angle of soil being used as a parameter for evaluating soil stability. reduce. Contents of the invention [0003] In view of the above technical problems, the present invention proposes an in-situ soil external friction angle testing device and...
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IPC IPC(8): G01N3/12G01N3/06
CPCG01N3/12G01N3/06G01N2203/0019G01N2203/0048G01N2203/0075G01N2203/0676
Inventor 孟永旭王浩吴彩虹陈波范胜华郭根发郑红剑张江浩杨倩
Owner 武汉吉欧信海洋科技股份有限公司