Mold for splitting to form multi-angle rock joint surface and joint sample manufacturing method

Abstract

The invention provides a mold for forming a multi-angle rock joint surface through splitting and a joint sample manufacturing method, relates to the field of rock mechanics tests, and can be used formanufacturing a multi-angle joint surface of a cylindrical rock sample. The mold comprises an upper box body and a lower box body which are used for bearing pressure, semi-circular grooves are formedin the lower end face of the upper box body and the upper end face of the lower box body respectively, and arc-shaped grooves with the included angles of 30 degrees, 45 degrees and 60 degrees with theaxes of the semi-circular grooves can be formed in the inner walls of the semi-circular grooves respectively. Spring fixing holes perpendicular to the bottom face of the lower box body are symmetrically formed in the bottoms of the semicircular grooves of the lower box body and used for containing springs. Two rectangular guide columns are symmetrically arranged on the outer walls of the left side and the right side of the upper box body respectively, and two rectangular guide grooves are symmetrically formed in the inner sides of the outer walls of the left side and the right side of the lower box body respectively. The mold can be used for manufacturing fresh joint surfaces which form multiple angles of 30 degrees, 45 degrees, 60 degrees and the like with the axis direction of a cylindrical rock sample and have complex three-dimensional morphological characteristics.

Description

technical field [0001] The invention relates to the technical field of rock mechanics tests, in particular to a mold for splitting to form multi-angle rock joint surfaces and a joint sample manufacturing method. Background technique [0002] In the construction process of rock mass engineering such as water conservancy, transportation, mining, drilling, etc., joint surfaces (joints, bedding, faults, etc.) of different scales and scales are often encountered. The existence of joints makes the rock mass heterogeneous and anisotropic Anisotropy and discontinuity, the mechanical properties of joints are the key factors affecting the macroscopic mechanical properties of rock mass (such as strength characteristics, permeability characteristics). Due to the low shear strength of joint surfaces, shear failure of rock mass along joint surfaces is a common form of engineering catastrophe. In shallow buried rock mass engineering, such as slopes, tunnels, etc., the buried depth of the ...

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Problems solved by technology

[0007] However, the existing sample preparation of rock joint surfaces has the following problems: ①The properties of similar materials are very different from those of natural rocks (low brittleness, low strength, and small elastic modulus), which cannot reflect the real mechanical properties of natural rocks, especially at high The properties of similar materials under stress are quite different from those of natural hard and brittle rocks; in addition, the morphology of prefabricated joint surfaces (such as jagged) is quite different from that of natural joints; ②Natural joint surfaces usually have different roughness and undulations. Irregular surface topography is often the decisive factor for joint strength, deformation, permeability and other characteristics; the use of rock cutting to form joint surfaces cannot reflect the complex three-dimensional topography of natural rock joint surfaces; The success rate is low, and the rock is not easy to fix when drilling samples with natural joints, and it is very easy to disturb the natural rock sample, changing its inherent structure and affecting the measured mechanical parameters

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