Method and device for shear test of rock mass structural plane

Abstract

The invention discloses a rock mass structural surface shear test method, which comprises the following steps: first cut the rock mass test piece into a cuboid and mark the vertical and horizontal axis lines; then adjust the adjusting rod so that the movable steel baffle plate will The rock mass specimen is fixed, and the vertical axis line of the rock mass specimen coincides with the vertical axis line of the normal loading mechanism, so that the horizontal axis line of the rock mass specimen coincides with the horizontal axis line of the shear loading mechanism. Lines coincide, so that the structural surface of the rock mass specimen is placed above the movable steel baffle; the normal loading mechanism applies force to the rock mass specimen in stages from the vertical direction, and the shear loading mechanism applies force to the rock mass specimen from the horizontal direction. Gradually apply force; the computer receives the force application data of the normal loading mechanism and the shear loading mechanism, and the displacement values ​​of the normal and horizontal displacement sensors, and analyzes and calculates the above data. The invention also provides a rock mass structural surface shear test device. The invention can simulate the force condition of rock mass in reality, and the test data is accurate and reliable.

Description

technical field [0001] The invention belongs to the field of rock engineering, and in particular relates to a method and a device for a shear test of a rock mass structure plane, which are mainly used for experimental research on the shear strength of a rock mass structure plane 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 plane is much smaller than that of the rock mass, which makes the bedding rock slope easy to slip and fail along the structural plane. Therefore, the shear strength parameters of the structural plane are determined. It is the key factor of slope stability control. At present, the determination of shear strength of structural planes at home and abroad is mainly obtained through empirical estimation method, field in-situ test and indoor direct shear test. For the empirical estimation method, the value is arbitrarily large, and it is ea...

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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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