Non-contact type surrounding rock stress release method based on high pressure waterjet

Abstract

A non-contact surrounding rock stress release method based on high-pressure water jet can be used for the treatment of rock bursts, so as to safely and efficiently release the stress of hard rock tunnels with high in-situ stress and avoid rock bursts during tunnel construction. In the present invention, the vehicle-mounted platform carrying the high-pressure water jet device is moved to a certain distance from the face, and the high-pressure water jet device is activated to use the high-pressure water jet generated by the high-pressure pump to cut from the face of the face to the deep surrounding rock, forming a certain distance from the face of the face. Grooving in depth and width to relieve surrounding rock stress by grooving and cutting water flow.

Description

technical field [0001] The invention relates to a surrounding rock stress release method, in particular to a non-contact surrounding rock stress release method based on a high-pressure water jet. Background technique [0002] In recent years, with the rapid development of my country's infrastructure construction and the continuous advancement of the western development, a large number of deep-buried and super-long cross-ridge tunnels have been launched one after another. The geological conditions encountered are becoming more and more complicated. , deep" development trend. When the tunnel passes through the deep buried high ground stress area, different degrees of rockburst and large deformation will occur, which will cause a series of engineering problems. Rockburst is a phenomenon in which the hard and brittle surrounding rocks are suddenly and violently released due to the excavation and unloading of the hard and brittle surrounding rocks, causing the rocks to burst and ...

AI Technical Summary

Problems solved by technology

[0004] Engineering experience shows that in areas with extremely high ground stress, spraying water on the face or the wall of the tunnel cannot achieve a good stress release effect, and injecting water into the surrounding rock to soften the surrounding rock may not only trigger the instability of the surrounding rock, but also require more time and money consuming

However, the method of releasing ground stress by drilling in advance is labor-intensive, poor in safety, high in construction cost, and inefficient (calculated according to the cross-sectional area of ​​the unloading hole, there is only less than one-thousandth of the deformation amount), and the unloading capacity is poor (non-continuous to avoid damage to the integrity and bearing capacity of the surrounding rock itself)

In addition, whether it is drilling in advance to release stress, or spraying water on the face of the face and injecting water into the surrounding rock, all of them belong to the contact stress release method of the surrounding rock, which requires the staff to work near the face of the face, which will inevitably affect the personal safety of the staff. pose a serious threat

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