Rock mass structural surface shear test method and device

Abstract

The invention discloses a rock mass structural surface shear test method, which comprises the following steps of firstly, cutting a rock mass test piece into a cuboid and marking a vertical axis line and a horizontal axis line; then adjusting an adjusting rod, fixing the rock mass test piece by a movable steel baffle, enabling the vertical axis line of the rock mass test piece to coincide with the vertical axis line of a normal loading mechanism, enabling the horizontal axis line of the rock mass test piece to coincide with the horizontal axis line of a shear loading mechanism, and enabling the structural surface of the rock mass test piece to be located above the movable steel baffle; carrying out grading force application on the rock mass test piece by the normal loading mechanism from the vertical direction, and carrying out grading force application on the rock mass test piece by the shear loading mechanism from the horizontal direction; receiving the force application data of the normal loading mechanism and the shear loading mechanism and the displacement values of a normal displacement sensor and a horizontal displacement sensor by a computer, and analyzing and calculating the data. The invention also provides a rock mass structural surface shear test device. According to the invention, the stress bearing condition of a rock mass in the reality can be simulated, and test data are accurate and reliable.

Description

technical field [0001] The invention belongs to the field of rock engineering, and in particular relates to a rock mass structural plane shear test method and device, which are mainly used for the shear strength test research of rock mass structural planes with a size of 10-50 cm. Background technique [0002] There are a large number of structural planes in the bedding rock slope, and the shear strength of the structural planes is much smaller than the strength of the rock mass, which makes the bedding rock slope very easy to slip and fail along the structural planes. Therefore, the determination of the shear strength parameters of the structural planes It is the key factor of slope stability control. At present, the determination of the shear strength of structural surfaces at home and abroad is mainly obtained through empirical estimation methods, field in-situ tests and indoor direct shear tests. For the empirical estimation method, the value is arbitrarily large, and i...

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Problems solved by technology

For the empirical estimation method, the value is arbitrarily large, and it is easy to have a certain deviation from the actual; and the in-situ test is rarely used in engineering because the instrument is inconvenient to carry, and it is time-consuming and labor-intensive; the traditional indoor direct shear The test generally uses a fixed shear box. Since the size and structural surface position of the rock mass specimen are not easy to control during the cutting process, and the specimen cannot be well fixed during the direct shear test, during the direct shear test It is very easy to produce relative movement, resulting in the deviation of the strength parameters of the structural surface from the actual value, resulting in inaccurate data

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