Rock-soil body shearing rheometer considering seepage-stress-chemical coupling

Abstract

The invention provides a rock-soil body shearing rheometer considering seepage-stress-chemical coupling. The rock-soil body shearing rheometer considering seepage-stress-chemical coupling comprises a test bench, a shearing box assembly, a loading assembly and a displacement-stress monitoring assembly; a large-size test sample can be placed in a shearing box unit, chemical liquid with a certain osmotic pressure is provided through a water pump, the test sample is dried through a hot air circulating unit, and seepage of the chemical liquid with different osmotic pressure and dry-wet circulation of the test sample are realized; normal pressure is loaded by weights, tangential pressure is loaded by a rigid spring, a vibration exciter acts on a spring so as to generate disturbance on tangential stress, and the deformation amount of the rigid spring is maintained by controlling a linear displacement mechanism to guarantee stability of the tangential stress; the displacement-stress monitoring assembly cooperates with a corresponding data acquisition system to monitor the displacement of a lower shearing box and the tensile force of the test sample. The rock-soil body shearing rheometer considering seepage-stress-chemical coupling can research the problems about rock-soil body disturbed by power, underwater, chemical corrosion, dry-wet circulation and long-term stability of single or combined action of stress.

Description

technical field [0001] The invention relates to a rock and soil shear rheometer, in particular to a rock and soil shear rheometer considering seepage-stress-chemical coupling, and belongs to the technical field of rock and soil engineering. Background technique [0002] Geological disasters such as landslides, collapses, and debris flows in nature are mostly caused by shear failure. Since all kinds of rock and soil have rheological effects to varying degrees, the study of shear rheological characteristics of rock and soil is a major engineering design. And the important factors that must be considered in the analysis of geological hazards. In the construction of water conservancy, transportation, mining and other fields, blasting and dynamic compaction are necessary procedures for slope shape reconstruction, foundation treatment, ore mining, etc. The dynamic disturbances generated by them will have obvious rheological effects on rock and soil. Water is an important factor a...

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Problems solved by technology

[0003] At present, domestic and foreign studies on the shear rheological properties of rock and soil under multi-field coupling are mostly based on triaxial test instruments, but the test instruments are often expensive and complicated to operate, and currently there are few shear rheological test equipment that consider the influence of multi-field coupling

For the research on the rheological properties of rock and soil under dynamic load disturbance, the triaxial unloading rheological test is mainly used. For the research on the rheological properties of rock and soil under the influence of rainfall, the dry-wet cycle treatment of the samples is mainly carried out first. Rheological test methods, but these simulation methods are obviously not consistent with the actual interaction between rainfall and blasting loads

In addition, the shear rheometer of the soil still uses the lever mechanism to apply the load. During the loading process, the tilt of the lever will cause a large loss of the load; the samples are all small-sized circular samples. There will be obvious stress concentration phenomenon, which will affect the test results

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