Manufacturing and operation method of standard joint anchoring test block mold based on 3D printing

Abstract

A standard cylindrical cylindrical anchor test block mold production and operation method based on 3D printed, CAD modeling, establishing hollow cylinders, bases and solid small round sticks with specific angles, and setting up the pillar body on the hollow cylindrical body.Small holes; divide the hollow columns into the upper mold and the lower mold; the file format is converted and the 3D printer is introduced; the 3D printer prints the mold components of each mold;Moom; insert steel bars to simulate the anchor rod, and install nuts at the end of the steel bars to anchor; make the standard size and contain a specific angle -assigned anchor test piece.This method can easily and accurately make cylindrical rock blocks that meet the standards of the International Rock Mechanics Society and include the nodes and anchor holes. At the same time, it can effectively ensure that the parameters of the nodes and the parameters of the anchor holes are accurately and effectively controlled.Significantly improve the stability and accuracy of parallel tests.

Description

technical field [0001] The invention relates to a method for making and operating a standard cylindrical joint anchoring test block mold based on 3D printing. Background technique [0002] There are many natural defects such as fissures, joints, and holes in engineering rock mass in nature. The restoration and simulation testing of such defects bring great challenges to engineers and technicians. In conventional research methods, there are mainly the following two simplified methods: the first one considers the rock mass as a homogeneous material, ignores internal cracks, holes and other defects, and then conducts parallel tests; the second one conducts specific experimental research on defects, There are relatively many corresponding research programs, such as carrying out standard rock block tests with holes, and rock block tests with one (multiple) parallel (cross) cracks. In the above test process, the rock blocks used are generally cylindrical specimens recommended by ...

AI Technical Summary

Problems solved by technology

Firstly, this research plan is relatively simple in the production of the joint surface. Most of the cement is poured and the baffle is pre-installed. After the cement solidifies, the baffle is removed to preset the joint surface

This production method cannot produce cylindrical test blocks at first, the main reason is that due to the shape of the test piece, there is no better way to pre-set the baffle and remove the baffle in the later stage

Therefore, the cuboid test block is used in the traditional research plan, so there is no uniform standard for the size of the test block, and there is a large degree of randomness and subjectivity. It is inconsistent with the recommended size of the International Society of Rock Mechanics, and the research conclusions are also very different.

Secondly, the angle control of the joint surface is not precise. According to the above production plan, the formation of the joint surface depends on the placement of the stoppers, and the placement angle is greatly affected by manual operation errors.

Thirdly, the anchor hole in the post-anchoring is formed by pre-setting the steel rod at a specific position for later demoulding, or drilling at a specific position in the later stage. No matter which method is used, it is interfered by manual operation factors, and there is a certain error

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