A method for rapid real-time classification of soil surrounding rock based on parameters while drilling

Abstract

The invention discloses a method for quickly grading terrene surrounding rock in real time on the basis of while-drilling parameters. The relational expression between a clay soil liquidity index and the while-drilling parameters, the relational expression between the sandy soil standard penetration hammering number and the while-drilling parameters and the relational expression between the gravel soil dynamic sounding hammering number and while-drilling parameters can be established, in actual underground engineering, the soil variety of a terrene tunnel is firstly judged, drilling detection is conducted, the obtained while-drilling parameters are substituted into the relational expressions to obtain the liquidity index I<L> of clay soil surrounding rock, the standard penetration hammering number N of sandy soil surrounding rock and the dynamic sounding hammering number N<63.5> of gravel soil surrounding rock, and then quick and real-time grading is conducted on the surrounding rock in front of a tunnel face according to the Guidelines for Design of Highway Tunnel. According to the method for quickly grading the terrene surrounding rock in real time on the basis of the while-drilling parameters, only drilling testing needs to be conducted on the surrounding rock through a drilling machine at an engineering site, other tedious indoor tests or site tests are not needed, quick and real-time grading is conducted on the terrene surrounding rock, the grading efficiency is high, and operation is easy.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering investigation, in particular to a method for rapidly and real-time grading soil surrounding rock based on parameters while drilling. Background technique [0002] Tunnel surrounding rocks are generally divided into soil surrounding rocks and rocky surrounding rocks, and soil surrounding rocks are subdivided into clay soil surrounding rocks, sandy soil surrounding rocks and gravel soil surrounding rocks according to different soil types. According to national standards, the indicators used in the classification of the three soil surrounding rocks are different. The classification of clay soil surrounding rocks requires soil samples to be measured in the laboratory to measure the liquid index I L , the sandy soil surrounding rock needs to carry out the standard penetration test on site to determine the standard penetration impact number N, and the gravel soil surrounding rock needs ...

AI Technical Summary

Problems solved by technology

[0003] (1) For the classification of clayey soil surrounding rock, the liquid index I is measured in the laboratory L , samples need to be taken from the field and transported to the laboratory, the soil will inevitably be disturbed, so that the measured liquid index I L There are different degrees of distortion, and the time period is long and the efficiency is low

[0004] (2) The standard penetration test and dynamic penetration test required for the classification of sandy soil surrounding rock and gravel soil surrounding rock can only be carried out on the ground, and a drilling rig must be used to drill to the test level first. Then carry out the standard penetration test or the dynamic penetrating test, it is impossible to test the soil surrounding rock in front of the face, resulting in too much unnecessary labor and high test cost

[0005] (3) Standard penetration test and dynamic penetration test, the test sections are generally far apart, and the classification is not accurate. During the construction of the subway tunnel, the test on the ground will also affect the traffic

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