Method for fast grading underground engineering surrounding rock in real time based on parameters while drilling

Abstract

The present invention discloses a method for fast grading underground engineering surrounding rock in real time based on parameters while drilling. According to the method, a on-site drilling test is implemented; uniaxial compressive strength along the drilling depth direction of a tunnel face and a rock mass integrity index are obtained based on parameters while drilling measured in a drilling process; a relational expression of the parameters while drilling, the uniaxial compressive strength and the rock mass integrity index is built; in actual underground engineering, the obtained parameters while drilling are introduced into the above relational expression; and surrounding rock in front of the tunnel face is graded fast in real time according to a surrounding rock basic quality (BQ) index grading calculation formula. With the method for fast grading the underground engineering surrounding rock in real time based on the parameters while drilling provided by the invention, it only need to utilize a drilling machine in an engineering field to carry out a drilling test on the surrounding rock, and coring and an laboratory testing are not required, and the surrounding rock can be graded fast in real time, and grading efficiency is high; and the grade of the surrounding rock can be determined just based on the drilling parameters, and various kinds of testing modes in a traditional grading method are not required. The method of the invention has the advantages of simplicity and operational easiness.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering investigation, in particular to a method for fast and real-time grading of surrounding rocks of underground engineering based on parameters while drilling. Background technique [0002] With the rapid development of the economy and the continuous progress of human society and the rapid development of basic construction, when constructing tunnels, subways or roadways, it is necessary to determine the support method and excavation method according to the classification of the surrounding rock. No has a huge impact on the construction period and support cost, especially in the context of the increasing number of TBM and shield machine construction, when the construction face cannot be quickly and accurately graded, broken surrounding rocks and bad geological bodies are encountered. , which may expose the TBM or shield machine to the risk of being stuck or even buried. [0003] There...

AI Technical Summary

Problems solved by technology

[0004] (1) Surrounding rock classification generally requires coring of the rock mass, combined with laboratory tests, which cannot achieve rapid and real-time classification, and the classification efficiency is low, which increases the time cost and economic cost of construction

[0005] (2) Generally, the surrounding rock classification sections are far apart, and the classification is not accurate. If the division of low-level surrounding rock sections is too long, it may cause excessive support, waste of materials, and a sharp increase in cost; if the division of high-level surrounding rock sections If the rock section is too long, it may cause insufficient support strength and increase the risk of surrounding rock instability and collapse

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