Rock tunnel potential seepage channel identification method based on micro-seismic monitoring

A technology of microseismic monitoring and seepage channels, which is applied in the field of geotechnical engineering, can solve problems such as difficult identification and poor identification, and achieve the effect of ensuring construction safety

Inactive Publication Date: 2020-06-16
SICHUAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Preliminary geological exploration and advanced geological drilling can better detect large seepage channels, such as faults and joints, but it cannot be well identified for some small faults and other hidden seepage channels, especially for tunnel openings. It is even more difficult to identify the potential seepage channels formed by digging through tiny cracks

Method used

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  • Rock tunnel potential seepage channel identification method based on micro-seismic monitoring
  • Rock tunnel potential seepage channel identification method based on micro-seismic monitoring
  • Rock tunnel potential seepage channel identification method based on micro-seismic monitoring

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Embodiment 1

[0037] This embodiment takes a large-scale hydropower station tail-tuning traffic tunnel as an example to specifically illustrate a method for identifying potential seepage channels in rock tunnels based on microseismic monitoring.

[0038] The microseismic monitoring system adopted in this embodiment is the ESG microseismic monitoring system (ESG Corporation of Canada). host part of the system). The network topology of the ESG microseismic monitoring system is as follows: figure 1 As shown, each acceleration sensor is connected to the Paladin digital signal acquisition system through a cable, and the Paladin digital signal acquisition system is connected to the Hyperion digital signal processing system through a network cable. Computer connection at Eguchi Camp Center. The sensitivity of the sensor is 30V / g, and the frequency response range is 50Hz~5kHz. The sampling frequency of the Paladin digital signal acquisition system is 20kHz. The sensor converts the received stress...

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Abstract

The invention provides a rock tunnel potential seepage channel identification method based on micro-seismic monitoring. The method comprises the following steps: (1), defining a monitoring region, andarranging sensors and blast holes; (2), blasting in the blasting holes at different time points, recording a take-off moment of elastic waves generated by each blasting, and calculating an average equivalent wave velocity of a rock mass; and (3), monitoring the monitoring region through a micro-seismic monitoring system; and measuring a seismic source position and a micro-seismic occurrence moment of a micro-seismic event generated in the monitoring region, drawing a seismic source position spatial distribution diagram, and when the seismic source position of the micro-seismic event is gathered in one or more local areas of the monitoring region and is in strip-shaped or planar distribution, determining that a potential seepage channel exists in the corresponding local area. According tothe method, the potential seepage channel appearing in a rock tunnel excavation process can be recognized more accurately, and construction safety of a rock tunnel can be better guided and guaranteed.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and relates to a method for identifying potential seepage channels of rock tunnels based on microseismic monitoring. Background technique [0002] Rocks include sedimentary rocks, metamorphic rocks, and igneous rocks, which are naturally produced mineral or glass aggregates with stable appearance, which are combined in a certain way. Naturally produced rock is a typical porous medium. During the long geological history, after reciprocating transformations such as complex tectonic movements, weathering, dissolution, and unloading, cracks and cavities are easily formed inside the rock. The rock fracture network system formed after the extensive development of rock fractures and cavities increases the permeability of the rock, and the extensive existence of cracks and cavities will reduce the rock properties, and will accelerate the development of internal cracks and cavities in the rock afte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306
Inventor 徐奴文蒋雄戴峰周家文
Owner SICHUAN UNIV
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