Rainfall infiltration and blast vibration coupling simulation soft rock shear rheological test shear box

Abstract

The invention relates to a rainfall infiltration and blast vibration coupling simulation soft rock shear rheological test shear box. An upper shear box and a lower shear box are arranged, an upper topplate and an upper shear body are arranged on the upper shear box, a lower shear body and a lower bottom plate are arranged at the lower shear box, the upper shear box and the lower shear box are pressed and connected by a vertical rolling shaft, a cavity is formed jointly by inner walls of the upper shear body and the lower shear body and is used for placing a rock test piece, a nominal loadingcushion block and a nominal loading press head are arranged at an upper part of the rock test piece, a water / gas inlet passage is arranged in the nominal loading press head and the nominal loading cushion block, a pre-clamping plate is arranged in the upper shear box and can be used for adjusting the rock test piece to be attached onto the upper shear body, a flat groove and a water / gas outlet passage are arranged in a contact part of the upper shear body and the lower shear body and encircles the cavity, rows of large balls are arranged at two sides of the lower shear body, rows of small balls and a movable sliding plate are arranged on the upper top plate, and rows of sliding balls are arranged under the lower bottom plate. By the shear box, high-pressure water / gas sealing can be ensured, dry and wet cycle operation is rapidly performed, the friction force is small during the shearing process, and a shear test result is coincidence to a true condition.

Description

Technical field [0001] The invention relates to a shear box, in particular to a shear box for coupling simulation of rainfall seepage and blasting vibration to simulate soft rock shear rheology. Background technique [0002] Weak interlayer (soft rock) is an important structural form of shear sliding collapse failure of open-pit mining slopes, and its shear rheological properties are one of the most important factors affecting slope stability. In the field of geotechnical engineering, the shear rheological properties of rock mass have a major impact on the long-term safety and stability of some major projects. In order to simulate and predict the long-term strength properties of weak interlayers under natural conditions, it is the simplest and most effective method to obtain the mechanical properties of soft rocks under various conditions by using indoor shear rheological tests. [0003] At present, the core technical difficulty in the development of a rain seepage and blasting vi...

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Problems solved by technology

[0004] ①. When the high-pressure water is injected into the shear box in the form of radial flow, only a single hole is injected with high-pressure water, and the specimen joint inserted into the rock specimen is integrally formed with the normal loading pad, and the rock is disassembled after a set of tests is completed. The test piece process is cumbersome, which affects the test efficiency

[0005] ②. During the test, the rock specimen can be penetrated by high-pressure water to increase the water content, but the specimen cannot be dried quickly, so it is difficult to simulate the process of the dry-wet cycle of the rock specimen under natural conditions

[0006] ③. The size of the cavity where the rock specimen is placed in the shear box is fixed. There will be a certain gap after the rock specimen is placed in the cavity, and the existing gap will cause the rock specimen to deflect during the shearing process. Affect the accuracy of test results

[0007] ④. The upper shear box and the lower shear box will produce sliding friction during the shearing process, which will not only cause unnecessary energy loss, but more importantly, the measured shear strength of the rock specimen is greater than the actual shear strength , how to reduce the impact of friction on test results is an urgent problem to be solved

[0008] ⑤. Applying cyclic vibration load during the shear rheological test can well simulate the impact of the blasting vibration on the specimen under actual working conditions. For the test equipment of cyclic vibration load, how to modify the shear box is an innovative problem

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