Analog prediction method and system for fractures in front of tunneling face based on time sequence model

A time series model and time series technology, applied in forecasting, CAD numerical modeling, instruments, etc., can solve the problems of inability to optimize the theory in real time, weak theoretical flexibility, weak applicability, etc., and achieve strong implementability, Guaranteed authenticity and cost-saving effects

Pending Publication Date: 2021-12-24
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these theories are not flexible enough to optimize the theory according to the real-time conditions in the tunnel.
At the same time, the prediction process is time-consuming, and the applicability is not strong in tunnel construction with tight construction schedules

Method used

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  • Analog prediction method and system for fractures in front of tunneling face based on time sequence model
  • Analog prediction method and system for fractures in front of tunneling face based on time sequence model
  • Analog prediction method and system for fractures in front of tunneling face based on time sequence model

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Embodiment 1

[0043] The purpose of this embodiment is to provide an analogous prediction method for cracks in front of the excavation face based on the time series model.

[0044] The analogous prediction method of cracks in front of the tunneling face based on the time series model, including:

[0045] Obtain historical rock mass fissure parameter index data, and construct different rock mass fissure parameter index time series;

[0046] Performing a stationarity judgment on the rock mass fissure parameter index time series, and performing a differential operation on an unstable sequence to obtain a stable sequence;

[0047]Based on the autocorrelation function diagram and partial autocorrelation function diagram of the stationary sequence with different parameters and the selection criteria of the fracture prediction sequence model, the fracture prediction model is determined respectively, and the unknown parameters of the model are estimated;

[0048] Based on the determined fracture p...

Embodiment 2

[0089] The purpose of this embodiment is an analogous prediction method for cracks in front of the excavation face based on the time series model.

[0090] In this embodiment, the scheme of the present disclosure is described in detail in conjunction with specific examples:

[0091] Based on the theory of Baecher's fracture disk model, firstly, a three-dimensional fracture generation program was compiled using MATLAB software to generate a random rock mass fracture model, and the center coordinates (x, y, z), radius r, and dip angle α of the fracture disk were obtained from the fracture model , β, γ, a total of seven indicators, combined with the mileage setting of the calculation example, respectively construct the rock mass fracture sequence data set of seven indicators; where α is the angle between the fracture surface and the positive direction of the x-axis, and β is the fracture surface and the y-axis The angle in the positive direction, γ is the angle between the crack ...

Embodiment 3

[0109] The purpose of this embodiment is an analog pre-system of cracks in front of the excavation face based on the time series model.

[0110] The crack analogy prediction system in front of the tunneling face based on the time series model, including:

[0111] A time series construction unit, which is used to obtain historical rock mass fissure parameter index data, and respectively construct different rock mass fissure parameter index time series;

[0112] A stationarity processing unit, which is used to judge the stationarity of the rock mass fissure parameter index time series, and perform differential operations on the non-stationary series to obtain a stationary series;

[0113] The prediction model determination unit is used to determine the fracture prediction model respectively based on the autocorrelation diagram and partial autocorrelation diagram of the stationary sequence with different parameters and the fracture prediction sequence model selection criteria, an...

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Abstract

The invention provides an analog prediction method and system for fractures in front of a tunneling face based on a time sequence model, and the method comprises the steps: obtaining historical rock mass fracture parameter index data, and constructing different rock mass fracture parameter index time sequences; carrying out stability judgment on the rock mass fracture parameter index time sequence, and carrying out differential operation on an unstable sequence to obtain a stable sequence; on the basis of the autocorrelation function diagrams and the partial autocorrelation function diagrams of the stationary sequences of the different parameters and a fracture prediction sequence model selection standard, determining fracture prediction models and estimating unknown parameters of the models; and on the basis of the determined fracture prediction model, predicting parameters of fractures in front of the tunneling face. According to the scheme, the cracks of the rock mass in front of the tunneling face can be comprehensively and accurately predicted in advance, and the influence of geological disasters on construction is effectively reduced.

Description

technical field [0001] The disclosure belongs to the technical field of crack prediction in front of tunnels, and in particular relates to an analogous prediction method and system for cracks in front of a tunneling face based on a time series model. 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] In the process of tunnel construction, engineering geological disasters such as tunnel collapse, water and mud inrush, and large deformation of surrounding rock often occur, which pose a great threat to construction safety and delay the construction process. The occurrence of the above geological disasters is inseparable from fault fracture zones, stratum lithology, and rock mass structure, etc., especially rock mass fissures, which have a greater impact on rock mass stability and increase the possibility of geological disasters. Therefore, if ...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F17/15G06Q10/04G06Q50/08G06F111/10G06F119/12
CPCG06F30/13G06F17/15G06Q10/04G06Q50/08G06F2111/10G06F2119/12
Inventor 潘东东李轶惠林春金王孝特许振浩李海燕
Owner SHANDONG UNIV
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