A box-type sampling shear strength test device

Abstract

The invention discloses a box-type sampling and shearing strength testing device which is provided with an equipment support, a drive mechanism, a locating mechanism and a control mechanism. The equipment support is provided with a cavity for containing a box-type sampler to be tested. The locating mechanism is arranged on the upper surface of the equipment support. The drive mechanism is arranged on the locating mechanism and provided with a cross-shaped plate testing assembly which is arranged to be inserted into clay to be tested and measure the shearing strength of the clay. The control mechanism is provided with a control circuit and arranged to output a testing starting instruction to the drive mechanism and read a corner value and a corresponding torque value of the cross-shaped plate testing assembly in real time. The invention relates to but not limited to clay testing equipment. By means of the application of the testing device, the defects in the prior art can be effectively overcome, the shearing strength of the weak clay with high water content can be tested, and the precision of final test results can be effectively ensured.

Description

technical field [0001] The present application relates to but not limited to clay testing equipment, especially a box type sampling shear strength testing device. Background technique [0002] In the prior art, the cross plate shear test is a test for measuring the undrained shear strength and sensitivity of saturated soft cohesive soil with a cross plate, which belongs to the original strength test; Press it into the soft soil at the bottom of the hole and rotate it at a uniform speed. Through a certain measuring system, measure the moment required for its rotation until the soil is destroyed, so as to calculate the shear strength of the excavated soil. In the above specific test process, the cohesive soil to be tested needs to provide sufficient support and reaction force to ensure the smooth progress of the test. [0003] At present, in the marine deep-water environment, the shallow soil layer is weak clay with high water content, and the shear strength of this type of s...

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Problems solved by technology

However, in the specific test process of the above-mentioned shear strength, the shear strength of the shallow soft clay cannot provide sufficient supporting reaction force for the test equipment of the conventional in-situ cross plate shear test; The plate shear test equipment cannot realize the shear strength measurement of the above shallow soil layer

[0004] Based on this, those skilled in the art also try to measure the above-mentioned soft clay with high water content in other ways; specifically, a certain column of clay to be tested is taken from the box sampler through a plastic tube, and the clay is limited by the wall of the plastic tube. To avoid large-scale flow, and then measure the shear strength of the above-mentioned clay to be tested in the plastic tube; the above-mentioned test process has the following disadvantages: the test is a manual point-by-point test, and only the peak value of the shear strength can be recorded. Continuous tracking test cannot be realized; the test is a vertical orientation test, horizontal positioning cannot be realized, and multi-point testing on the same plane cannot be realized, and the test result error is large; the string sampling operation of plastic pipe involves secondary sampling operation, and the clay to be tested The disturbance is large, which affects the accuracy of the final test result

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