Dry-wet circulating direct shear device for structural surface of rock mass

Abstract

The invention provides a dry-wet circulating direct shear device for a structural surface of a rock mass. The dry-wet circulating direct shear device at least comprises a frame, a shearing box unit and a loading unit, wherein the shearing box unit comprises an upper shearing box, a lower shearing box, a water-full component and a drying component; the upper shearing box is located above the lower shearing box; sample slots are formed in the upper shearing box and the lower shearing box; the water-full component comprises a water tank, a water inlet pipe, a water outlet pipe, a connecting pipe and a tee joint pipe; the connecting pipe is provided with a pipeline switch A; the tee joint pipe is provided with a pipeline switch B; the water tank is located in the lower shearing box and is communicated with the sample slots; the water inlet pipe, the water outlet pipe and the connecting pipe are communicated with three openings of the tee joint pipe, respectively; the other end of the connecting pipe is communicated with the water tank; the drying component comprises a draught fan and a ventilating pipeline; the draught fan is located outside the lower shearing box and is communicated with the sample slots through the ventilating pipeline. The dry-wet circulating direct shear device for the structural surface of the rock mass can realize control on dry and water-full environments in the shearing process of the structural surface, can meet the requirement of test on dry-wet circulating condition to the greatest extent and can realize true dry-wet circulating shearing.

Description

technical field [0001] The invention relates to a rock mass structural surface direct shear instrument, in particular to a rock mass structural surface dry-wet cycle direct shear instrument, which belongs to the technical field of rock mechanics testing. Background technique [0002] During the operation of the reservoir, the water level of the reservoir will fluctuate and fluctuate periodically for a long time. For example, the water level of the Three Gorges Reservoir fluctuates periodically between 145m and 175m (with a drop of 30m), which makes the landslide wading zone constantly saturated and dehydrated, showing The alternating phenomenon of dry and wet cycles changes the mechanical properties of landslides, especially the weak structural surfaces. The shear mechanical properties of weak structural planes (weak interlayers) have an important influence on the evolution and development of landslides. According to incomplete statistics, about 90% of the 283 large-scale c...

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Problems solved by technology

Using this method to carry out the dry-wet cycle shear test of the structural surface has the following problems: (1) Although the structural surface is soaked in the container to reach the saturated state, when it is taken out of the container and put into the shear box, the structural surface sample The non-water-saturated environment in which it is located cannot realize water-saturated shearing in the true sense; (2) The current method can only cut the sample at one time, take it out of the shear box and continue to saturate or dry it. Then shear again, put back into the shear box and shear again so that only the residual strength properties of the sample can be obtained, and the dry-wet cycle shear mechanical properties of the sample from the peak strength to the residual strength cannot be obtained; (3) test The sample is repeatedly taken out of the shear box, and the stress environment of the sample has also experienced repeated loading and unloading processes, and the disturbance is very large.

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