A Risk Control Method for Stratum Lifting During Grouting

A risk control and stratigraphic technology, applied in the direction of nuclear methods, soil protection, on-site foundation soil survey, etc., to achieve the effect of realizing dynamic characteristics, overcoming secondary disturbances, and improving anti-interference ability

Active Publication Date: 2021-10-29
HUNAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in view of the technical problems existing in the prior art, the present invention provides a method for controlling the risk of stratum uplift during grouting, aiming at the damage caused by the uplift risk to the cover weight and the stratum grouting process. Based on the combination of support vector machine and mathematical model, a time-varying uplift and deformation control method suitable for the cover weight-stratum system in the process of dam grouting is proposed to achieve the purpose of stratum uplift risk control

Method used

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  • A Risk Control Method for Stratum Lifting During Grouting
  • A Risk Control Method for Stratum Lifting During Grouting
  • A Risk Control Method for Stratum Lifting During Grouting

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Embodiment approach

[0044] Figure 1 to Figure 3 An embodiment of the method for controlling the risk of formation uplift during grouting according to the present invention is shown, including the following steps:

[0045] 1) Establish a stratum uplift response model;

[0046] 2) Real-time detection of the lifting displacement of the formation in the model by the displacement sensor, as the detection displacement, with the upper limit of the displacement displacement as the target displacement, and the detection displacement x={x 1 ,...,x n} as input data and upper limit of lifting displacement y={y 1 ,...,y n} is used as the displacement learning target of the support vector machine, and the prediction function of the support vector machine is constructed:

[0047]

[0048]

[0049] where x i is the i-th sample among n samples; K(x i x) is the kernel function; alpha i for the corresponding x i The support vector; b is the threshold, σ is the kernel function width parameter.

[005...

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Abstract

The invention discloses a method for controlling the risk of stratum uplift during grouting, which comprises the following steps: 1) predicting the stratum uplift displacement after Δt time based on the support vector machine method; 2) establishing a stratum uplift response mathematical model; The theoretical grouting pressure value corresponding to the predicted displacement calculated by the dynamic and dynamic response mathematical model; 3) The initial set value of the grouting pressure is compared with the grouting pressure value corresponding to the predicted displacement calculated by the mathematical model, and the deviation e is obtained, and the deviation e is within the range of the preset value When it is within, there is no need to adjust the grouting pressure; when the deviation e is not within the preset value range, go to step 4); 4) The grouting pressure is adjusted in advance by Δt time through two fuzzy controllers. Aiming at the problem of cap weight-stratum lift damage during the grouting process, the present invention proposes a time-varying lift deformation control method suitable for the cap weight-stratum during the grouting process of the dam, so as to achieve the purpose of stratum lift risk control.

Description

technical field [0001] The invention relates to the technical field of grouting stratum lift control, in particular to a risk control method for stratum lift during grouting. Background technique [0002] Grouting is to apply gelling grout or chemical solution according to the specified ratio or concentration, apply mechanical pressure to it, and send it through drilling or other facilities, rock cracks or foundation pores, surrounding rock cracks or tunnels. Areas that require grouting. Thereby filling these joint fissures, pores, voids, voids or cracks can play the role of consolidation, bonding, anti-seepage, improving bearing strength and deformation resistance, and transferring stress. [0003] There are countless fissures and fissures criss-crossing in the formation in the irrigation area. During the process of filling these fissures and fissures, the grout deforms these fissures and fissures and increases the original opening degree. After the opening degree increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/12E02D1/00G06N20/10
CPCE02D1/00E02D3/12E02D2250/003G06N20/10
Inventor 陈娟刘晓光杨仙刘小沛谢佳能周怡李凤玲
Owner HUNAN UNIV OF SCI & TECH
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