Method for detecting anti-knock property of double-steel-plate-concrete long vertical shaft structure

Abstract

The invention discloses a double steel plate-concrete long vertical shaft structure anti-explosion performance detection method, and belongs to the field of anti-explosion performance detection, and the method comprises the following steps: S1, obtaining a material model and parameters of a rock-soil medium through a dynamic mechanical property test; mechanical parameters of concrete, steel and rock-soil media are obtained through a material mechanical property test; obtaining a material model and parameters of the rock through an impact explosion dynamic material test; s2, establishing a related finite element model by using finite element calculation software; and S3, importing the material model and parameters and mechanical parameters of the rock-soil medium obtained in the step S1 and the material model and parameters of the rock into finite element calculation software for numerical simulation calculation. According to the method for detecting the anti-knock performance of the double-steel-plate-concrete long vertical shaft structure, the anti-knock performance data of the double-steel-plate-concrete shaft can be accurately obtained through a numerical simulation calculation and verification model test method.

Description

Technical Field

[0001] This invention relates to a method for testing blast resistance, and more particularly to a method for testing the blast resistance of a double steel plate-concrete long vertical shaft structure. Background Technology

[0002] Double-steel-plate-concrete shafts in complex geological conditions are prone to severe damage under conventional weapon attacks. Conventional testing methods cannot accurately measure the blast resistance of double-steel-plate-concrete shafts; therefore, there is an urgent need for a method to test the blast resistance of long, straight double-steel-plate-concrete shaft structures. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a method for testing the blast resistance of a double steel plate-concrete long vertical shaft structure, comprising the following steps:

[0004] S1: Obtain material models and parameters of soil and rock media through dynamic mechanical property tests; obtain mechanical parameters of concrete, steel, and soil and rock media through material mechanical property tests; obtain material models and parameters of rock through impact explosion dynamics material tests;

[0005] S2: Use finite element calculation software to establish relevant finite element models. For the blast resistance problem of soil structures and the dynamic characteristics of soil and rock media, the LAGRANGE-EULER algorithm is used. Air, explosives and part of the soil and rock media are treated as multi-material fluids, and the structure and soil and rock media are treated as solids. The fluid-structure interaction method is used to simulate the explosion process in the soil and rock media. The penalty function contact algorithm is used to simulate the interaction between the soil and rock media and the structure.

[0006] S3: Import the material model and parameters, mechanical parameters of the soil and rock medium, and the material model and parameters of the rock obtained in step S1 into the finite element calculation software for numerical simulation calculation.

[0007] Furthermore, the mechanical parameters include compressive stress, tensile stress, and shear stress;

[0008] Furthermore, the impact explosion kinetics material testing includes the following steps:

[0009] S11: Design test charges and targets, analyze the propagation law of explosive shock waves in rock and soil media, the interaction between rock and soil media and structures, and the embedding effect of the interface between soft and hard rocks.

[0010] S12: Model test conditions;

[0011] S13: Model test measurement system.

[0012] In summary, the present invention has the following advantages over the prior art:

[0013] The blast resistance testing method for double steel plate-concrete long vertical shaft structures provided by this invention can accurately obtain blast resistance performance data of double steel plate-concrete vertical shafts through numerical simulation calculation and verification model test. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0015] Figure 1 A flowchart of the method for testing the blast resistance of a double steel plate-concrete long vertical shaft structure provided by the present invention;

[0016] Figure 2 This is a schematic diagram of the equivalent geological materials used in the model test.

[0017] Figure 3 Schematic diagram for setting the detonation distance according to the explosive charge ratio;

[0018] Figure 4 A schematic diagram showing the setting of explosive charge burial depth and geotechnical material parameters;

[0019] Figure 5 A schematic diagram of the test setup for the explosion model test measurement system;

[0020] Figure 6 This is a schematic diagram of the model test measurement system;

[0021] Figure 7 This is a schematic diagram of the finite element calculation model;

[0022] Figure 8 The multilayer medium in the finite element calculation results is shown in the stress wave propagation diagram;

[0023] Figure 9 This is a schematic diagram of the structural dynamic response from the finite element analysis results;

[0024] Figure 10 Model of wall load action in vertical shaft structure;

[0025] Figure 11 Model of wall load action in vertical shaft structure;

[0026] Figure 12 These refer to different types of shaft structures and their openings. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular form may also include the plural form unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0030] See Figure 1 As shown, this invention provides a method for testing the blast resistance of a double-steel-plate-concrete long vertical shaft structure, including the following steps:

[0031] S1: Obtain material models and parameters of soil and rock media through dynamic mechanical property tests; obtain mechanical parameters of concrete, steel, and soil and rock media through material mechanical property tests; obtain material models and parameters of rock through impact explosion dynamics material tests;

[0032] In this step, since the materials involved in the numerical calculation mainly include sand, rock, concrete, steel, explosives, etc., and relatively mature material models and parameter determination methods have been formed for sand, concrete, steel, and explosives, only simple material performance tests are needed to determine the key parameters; however, the material model and parameters of rock need to be calibrated in detail by conducting impact explosion dynamics material tests.

[0033] As a preferred option, the mechanical parameters include compressive stress, tensile stress, and shear stress;

[0034] As a preferred embodiment, the impact explosion kinetics material test includes the following steps:

[0035] S11: Experimental Explosives and Target Design

[0036] First, addressing the challenge of obtaining sufficient original rock for drilling and installing shaft structures, the influencing factors of the soil and rock medium were analyzed in the dynamic response study of shafts within the soil and rock medium:

[0037] ① The propagation law of explosion shock waves in rock and soil media;

[0038] ② The interaction between the soil and rock medium and the structure, the expression for the structural wall load is as shown in equation (1):

[0039]

[0040] In the formula: P r For the structural wall load, P i For free field pressure, G soil R is the shear modulus of the soil and rock medium, r1 is the outer diameter of the structure, and w is the shear modulus of the soil and rock medium. r ρ is the soil displacement, W is the structural displacement, and ρ is the soil displacement. soil Let c be the density of the soil / rock medium, and c be the elastic wave velocity of the soil / rock medium. The velocity of particles in the soil and rock medium. The velocity of the structure's motion.

[0041] ③ The embedding effect at the interface between soft and hard rocks.

[0042] like Figure 2 As shown, the propagation law of stress waves can be determined based on rock and soil material tests; other influencing factors are reflected in the basic mechanical parameters of the material (modulus, density, etc.), so other materials can be used to replace the original rock in model tests.

[0043] S12: Model Test Conditions

[0044] like Figure 3 and Figure 4 As shown, in order to investigate the influence of charge location and soil and rock material parameters on the damage effect on the shaft structure, the charge burial depth h was set in the model test. e , Charge to structural proportion detonation distance Three variables: relative stiffness of the soil and rock medium. For cases where the overburden charge is located in a sandy or weak rock layer, the proportional blast distance... At 0.6 m·kg -1 / 3 to 1.5 m·kg -1 / 3 The relative stiffness of the soil and rock medium was set using three typical strata.

[0045] Note: The experiment used a combination of TNT propellant columns to obtain the appropriate amount of propellant.

[0046] S13: Model Test Measurement System

[0047] like Figure 5 and Figure 6As shown, a reasonable measurement system for the explosion model test is the key to obtaining accurate and effective test data. The purpose of the model test is to obtain data on the structural wall load and structural dynamic response. Therefore, it is necessary to build a measurement system that includes a dynamic data acquisition instrument, a charge amplifier, an earth pressure sensor, and velocity and acceleration sensors.

[0048] The pressure sensor measures the wall load on the structure, analyzes the interaction between the soil and the structure, and the load distribution pattern on the structure. The pressure measurement points are set at the detonation point and the side detonation point of the structure at the depth of the explosive charge, as well as on both sides of the interface between soft and hard rock. Since it is difficult to use displacement sensors to measure structural displacement, a method of integrating and comparing data from velocity and acceleration sensors is used to obtain structural displacement. The displacement measurement points are set at the detonation point and the back detonation point of the structure at the depth of the explosive charge, as well as on both sides of the interface between soft and hard rock.

[0049] S2: A finite element model is established using finite element calculation software. For the blast resistance problem of soil structures and the dynamic characteristics of soil and rock media, the LAGRANGE-EULER algorithm, i.e., a fluid-structure interaction algorithm (such as...), is employed. Figure 7 As shown in the figure, this method treats air, explosives, and part of the soil and rock medium as multi-material fluids, and the structure and soil and rock medium as solids. The explosion process within the soil and rock medium is simulated using fluid-structure interaction, and the interaction between the soil and rock medium and the structure is simulated using a penalty function contact algorithm. Preliminary numerical simulation results are shown in the figure. Figure 8 and Figure 9 As shown.

[0050] S3: Import the material model and parameters, mechanical parameters of the soil and rock medium, and the material model and parameters of the rock obtained in step S1 into the finite element method software for numerical simulation. The calculation results are as follows: Figure 10 As shown;

[0051] Example 1 (Research on the calculation method of elastoplastic dynamic response of vertical shaft structure under conventional weapon action):

[0052] (1) Deformation Feature Analysis

[0053] Based on experimental and numerical simulation results, the deformation characteristics of the shaft structure are analyzed, including the final deformation form, displacement at key locations, and internal force time history curves. The dynamic principle of the structural deformation process is revealed, and the deformation modes of the structure (elastic, elastoplastic, plastic hinge, punching shear, etc.) are extracted.

[0054] (2) Load calculation model

[0055] like Figure 11As shown, based on the propagation law of explosive shock waves in soil and rock, the Constantino shell structure and soil interaction theory, and combined with experimental and numerical simulation results, the model is extended to multi-layer soil and rock media to derive and fit an optimized calculation model for the wall load of the shaft structure.

[0056] (3) Structural Elastic-Plastic Response Calculation Model

[0057] 1) Elastic response calculation

[0058] According to the method of establishing a multi-layered rock and soil medium embedded constraint model for the vertical shaft structure by treating the steel plate-concrete shaft structure as a homogeneous elastic material, the elastic response of the structure is calculated. Equation (2) is the classic vibration differential equation of the column shell structure.

[0059]

[0060] The key to solving differential equations is to determine their initial and boundary conditions, with particular emphasis on determining the boundary conditions, namely the constraint effect of the multi-layered soil and rock media on the shaft structure, especially the constraint effect of the structure at the interface of different soil and rock layers.

[0061] 2) Elastic-plastic response calculation

[0062] Based on the principle of data-driven design, and based on a large number of numerical simulation results, the deformation characteristics of the structure after entering the plastic stage are analyzed. The relationship between the elastic-plastic deformation of the structure and the deformation results calculated according to elasticity is obtained. The influence law and mechanism of charge parameters, soil and rock medium parameters and structural parameters are analyzed. Through multi-parameter fitting, an engineering algorithm for predicting the elastic-plastic response of the structure based on the illusory deformation value calculated by elasticity is obtained.

[0063] Example 2 (Study on Shaft Structure and Mouth Protection Effectiveness):

[0064] like Figure 12 As shown, the increased width of the shielding layer increases the distance between the incoming projectile's detonation point and the structure. Strengthening the shaft structure and increasing its thickness enhances its resistance to explosions. However, different defense levels require the engineering to withstand different levels of incoming weapons, which also increases the construction cost of the protective engineering.

[0065] Based on the shaft structure response calculation method obtained from the above research, this section analyzes the relationship between the characteristic parameters of the shaft structure (material strength, structural dimensions) and the dimensions of the entrance shielding layer and the blast-resistant layer. Through a case study, it analyzes the relationship between the construction cost of the shaft and its entrance and the blast-resistant performance, and establishes a cost-effectiveness model for the protection effectiveness of the shaft structure and its entrance.

[0066] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for testing the blast resistance of a double-steel-plate-concrete long vertical shaft structure, characterized in that, Including the following steps: S1: Obtain material models and parameters of soil and rock media through dynamic mechanical property tests; obtain mechanical parameters of concrete, steel, and soil and rock media through material mechanical property tests; obtain material models and parameters of rock through impact explosion dynamics material tests; S2: Use finite element calculation software to establish relevant finite element models. For the blast resistance problem of soil structures and the dynamic characteristics of soil and rock media, the LAGRANGE-EULER algorithm is used. Air, explosives and part of the soil and rock media are treated as multi-material fluids, and the structure and soil and rock media are treated as solids. The fluid-structure interaction method is used to simulate the explosion process in the soil and rock media. The penalty function contact algorithm is used to simulate the interaction between the soil and rock media and the structure. S3: Import the material model and parameters, mechanical parameters of the soil and rock medium, and the material model and parameters of the rock obtained in step S1 into the finite element calculation software for numerical simulation calculation.

2. The method for testing the blast resistance of a double steel plate-concrete long vertical shaft structure according to claim 1, characterized in that, The mechanical parameters include compressive stress, tensile stress, and shear stress.

3. The method for testing the blast resistance of a double steel plate-concrete long vertical shaft structure according to claim 1, characterized in that, The impact explosion kinetics material test includes the following steps: S11: Design test charges and targets, analyze the propagation law of explosive shock waves in rock and soil media, the interaction between rock and soil media and structures, and the embedding effect of the interface between soft and hard rocks. S12: Model test conditions; S13: Model test measurement system.

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