On-site hydraulic coupling direct shear test structure device and construction method of rock mass structural plane

Abstract

The invention relates to a rock structural surface on-site hydraulic coupling direct shearing test structure device. The device comprises a tubular steel structure high-water pressure test chamber, a force transmission steel plate, a flat jack, a shearing box for mounting a test rock, two counter-force support steel plates located at two sides of the shearing box and fixed to the bottom of the tubular steel structure high-water pressure test chamber, a first transmission stand column fixed to the inner side of the top of the tubular steel structure high-water pressure test chamber, a vertical jack fixed in the test chamber between the bottom of the first transmission stand column and the top of the shearing box, a second transmission stand column of which the top end is connected to the top surface of a test room, an extra-chamber counter-force jack arranged between the outer side of the top of the tubular steel structure high-water pressure test chamber and the bottom end of the second transmission stand column, a normal load control system, a differential oil pressure multiplier and a shear load control system are arranged outside the tubular steel structure high-water pressure test chamber. The method and device are not limited by a test part and time and ensure the accurate and real determination of underwater rock structural surface shear strength parameters.

Description

technical field [0001] The invention relates to the technical field of on-site rock mass structural surface mechanics tests, in particular to an on-site hydraulic coupling direct shear test structural device and construction method of rock mass structural surfaces. Background technique [0002] The direct shear test of the structural surface of the rock mass is a method to obtain the shear strength parameters of the structural surface of the rock mass by carrying out normal and tangential loading on the samples processed on site. Has a guiding role. During the construction of water conservancy and hydropower projects in western my country, many high dams and large reservoirs have been formed. During the operation of these reservoirs, the rock mass below the reservoir water is usually under certain hydraulic pressure conditions. If there are cracks, weak interlayers, etc. in the rock mass Structural surfaces often become seepage channels for reservoir water or groundwater. C...

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Problems solved by technology

In particular, the structural planes in the foundation rock mass of high dams, large reservoirs and reservoir slopes in the alpine and canyon areas will bear the long-term effects of reservoir water pressure and groundwater seepage during long-term operation, while the structural planes of underwater rock mass resist shear The deterioration of strength characteristics will cause obvious valley deformation in the canyon, which will seriously affect the working performance and long-term safe operation of high dams

[0003] The current on-site rock mass structural surface direct shear test methods are all carried out under the condition of no hydraulic pressure and no seepage, and the obtained shear strength parameters cannot be compared with the rock mass structural surface under certain water pressure conditions or certain seepage conditions during project operation. The shear strength parameters match

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