A water injection method for cracks in rock-like specimens used in rock frost heave tests

Abstract

The invention discloses a method for injecting water into cracks of a rock-like test piece for a rock frost heave test, which comprises the steps of: 1. preparing a non-isothermal control test device for water injection; 2. installing stress strain gauges at crack openings of the rock-like test piece; 3. Put the rock-like specimens into the temperature-controlled test chamber of the middle layer; After the rock-like specimen is dipped in water without colored ink, wrap the crack surface with plastic wrap and put it into the top temperature control test chamber; 6. Pour the water with colored ink into the infusion bottle and hang it on the On the infusion stand, adjust the flow to the minimum; 7. Pierce the vent hole and water injection hole on the crack and inject water; 8. Remove all the plastic wrap. The invention is easy to realize, improves the water injection efficiency, can effectively reduce water loss in cracks during the water injection process, prevents seepage, and helps to improve the accuracy of the rock frost heave test.

Description

technical field [0001] The invention belongs to the technical field of rock frost heave tests, and in particular relates to a method for injecting water into cracks of rock-like test pieces used for rock frost heave tests. Background technique [0002] The crack frost heaving force of rocks has always been a key direction of research in permafrost regions, and in recent years, as coal mines and other projects have gradually moved westward, the rock formations in the western permafrost regions have become more and more disturbed. The research on rocks has also reached a climax, and in the cracked rocks in the natural state, the crack frost-heaving force, especially for the cracked rocks in the permafrost region, the crack frost-heaving force has always been the main factor affecting rock damage. The research on fracture frost heaving force has gradually entered the laboratory stage from empirical theory, and the research on fractured rocks is mainly divided into natural rock ...

AI Technical Summary

Problems solved by technology

[0003] However, as the experiment progresses, in order to simulate more realistic rock fractures, not only non-penetrating single fractures, but also gradually penetrating cracks, even double cracks in different orientations, and different shapes (cylindrical, cube, etc.) different types of cracks in test pieces, etc.) to simulate the crack frost-heaving force in the laboratory. However, with the requirements for the accuracy of the experiment, the water injection of the experiment has become a difficulty in the experiment. How to ensure the different cracks in the process of water injection Water can freeze when the cracks are full of water, thus forming the crack freezing force of the rock. However, with the different shapes of the test pieces, the crack forms are different, resulting in water loss after water injection, and through the bonding of the device, it may Will affect the effect of crack freezing force

However, if the water saturation device is too complicated, different water saturation settings for different fractures of different rock-like events will make the overall experiment too complicated, which is not conducive to the large-scale experiment of flooding and saturating fractures in different batches. Will greatly increase the workload and cost of the experiment

Moreover, during the freezing process, the total frost heave phenomenon is not easy to observe during the development of the frost heave force

Images