Three-dimensional imaging method of resistivity data fusion for boulder detection in subway shield section

Abstract

The invention discloses a three-dimensional imaging method for merging the resistivity data of boulder detection in the subway shield section to obtain the original data of cross-hole CT and high-density electrical geophysical exploration in the subway shield section, and after inverting the two original data, the span Hole CT and high-density electrical method two-dimensional resistivity profile; extract cross-hole CT and high-density electrical method data at the same position, and then use principal component analysis method to fuse the two data; perform two-dimensional imaging of resistivity data to obtain multiple A two-dimensional cross-sectional view of the resistivity data, and convert the two-dimensional coordinates into three-dimensional coordinates to form a three-dimensional model diagram. This disclosure better describes the distribution of boulder groups in three-dimensional space, and the correlation between each boulder is more obvious, which provides guarantee for the safe construction and smooth development of shield tunneling.

Description

technical field [0001] The disclosure belongs to the technical field of advanced tunnel forecasting, and relates to a three-dimensional imaging method for fused resistivity data of boulder detection in a subway shield section. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] With the rapid development of the urban rail transit industry, the subway has ushered in unprecedented opportunities and development climax. Shield tunneling technology has gradually become an important means of subway construction due to its advantages of fast tunneling speed and high degree of automation. However, shield tunneling technology Poor adaptability to strata, encountering unexplored distribution of boulders during long-distance excavation, which may cause the cutter head to get stuck, deformed or quickly worn out, or cause the tunnel surface to collapse in...

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Problems solved by technology

[0004] According to the knowledge of the inventor, the conventional geophysical methods for the isolated rock in front of the shield machine include the ground penetrating radar method, the high-density electrical method, the cross-hole resistivity CT method, etc., but the single geophysical method has many limitations. False anomalies are generated, or the distribution range of boulders cannot be well reflected. Therefore, joint imaging of multiple geophysical methods is very necessary, and conventional imaging is often two-dimensional, which cannot reflect the distribution of boulders in space.

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