Three-dimensional wave velocity imaging measurement-while-drilling method and device for rock in front of tunnel face

Abstract

The invention discloses a three-dimensional wave velocity imaging measurement-while-drilling method and device for rock in front of the tunnel face. Before an advanced geological drilling rig works, earthquake wave receiving sensors are rapidly arranged on the tunnel face and the tunnel lateral face; a loop-line combined three-dimensional observation mode is adopted, and according to the data fed back through a drilling depth sensor in real time, the running mode of a drill rod of the advanced geological drilling rig and the drilling mode of a drill bit are automatically switched at the right moment through a drilling rig control system; earthquake source signals are collected in real time through a pivot sensor, noise signals are collected in real time through a noise sensor, and earthquake waves are collected through the earthquake wave receiving sensors in real time. By means of the device, the distribution condition of unfavorable geologic bodies in front of the drilling portion of the advanced geological drilling rig and the distribution condition of unfavorable geologic bodies around a tunnel can be obtained, the rock in front of the drilling portion can be accurately assessed, the quality level of the rock in front of the drilling portion can be predicted, the unfavorable geologic bodies in front of the tunnel face can be found in time, a construction scheme can be optimized accordingly, and use reference can be provided for guaranteeing the tunnel construction safety.

Description

technical field [0001] The invention aims at the development of new technology of exploration-while-drilling in the field of tunnel seismic exploration, relates to the field of advanced geological detection during tunnel construction, and in particular relates to a method and device for measuring-while-drilling for three-dimensional wave velocity imaging of rock mass in front of a tunnel face. Background technique [0002] Tunnel advanced geological prediction is to use drilling and geophysical detection to detect the geological conditions in front of the tunnel excavation face, and to grasp the structure and properties of the rock mass in front of the excavation face, as well as unfavorable geological structures such as karst caves, underground rivers, and faults before construction. To provide guidance for further construction to avoid geological disasters such as water and mud inrush, landslides, and large deformations, and to ensure construction safety. [0003] The exis...

AI Technical Summary

Problems solved by technology

The advantages are: it can directly reveal the condition of the rock mass, and the explanation is simple and intuitive; the disadvantage is: it is easy to cause misreporting and omission of unfavorable geological bodies due to a single hole view; on the basis of advanced geological drilling methods, the drilling process proposed by Yue Zhongqi et al. Monitoring system (DPM), through the real-time monitoring and processing of data such as thrust, torque, and rotational speed during the drilling process, obtains the drilling resistance strength of the rock mass, and then evaluates the quality of the rock mass on the drilling trajectory. The disadvantage is that the quality of the full-section rock mass to be excavated cannot be evaluated, and the unfavorable geological bodies in front of the drilling cannot be predicted in advance, and the problem of one-hole view cannot be solved.

[0005] ① The observation method is not applicable: in the seismic method of oil logging while drilling, the observation space available on the ground is relatively large, and the geophone array can be arranged in a large area to obtain the reflection seismic information of deep anomalies; but in the tunnel , due to the limitation of the size of the tunnel face, it is impossible to arrange a large-scale geophone array on the same plane, and the observation space is limited; how to propose a reasonable observation method and carry out rapid Arrangement is an urgent problem to be solved;

[0006] ②Insufficient energy of longitudinal and transverse waves: In oil drilling, due to the low detection accuracy and large detection range, the longitudinal wave generated by the rock-breaking seismic source of the drill bit or the seismic wave emitted by the seismic wave generator installed on the drill bit can be used. The detection of unfavorable geological bodies; however, in the tunnel, the drill pipe and bit of the advanced drilling rig are small in size, and the corresponding seismic wave generator device cannot be installed, and to achieve fine evaluation of rock mass quality and accurate detection of unfavorable geological bodies, it is necessary to use a large enough The longitudinal and transverse waves of energy are collected and processed

How to accurately collect noise signals and denoise seismic signals is difficult;

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