CN102080945A - Safety evaluation method and system of blasting vibration based on energy input - Google Patents

Abstract

The invention relates to the field of safety of blasting vibration and aims to provide a safety evaluation method and system of blasting vibration based on energy input. The system comprises a blasting vibration safety evaluation module built-in a computer system. The method comprises the steps of: performing empirical mode decomposition for a signal of blasting vibration, extracting a function component of natural mode of vibration of a blasting vibration signal, performing Hilbert conversion for the function of natural mode of vibration of the blasting vibration signal and calculating the Hilbert instantaneous energy value of the signal; integrating the Hilbert instantaneous energy value and obtaining a total input energy TIE value; comparing the total input energy TIE value as a safety evaluation index of blasting vibration with a critical TIE index of a protected object in a safety evaluation index library module of blasting vibration to obtain the safety indication information. By using the TIE as the safety evaluation index of blasting vibration, the invention can perform more explicit and concise quantificational description for factors such as basic frequency, duration and the like and evaluate the influence of the blasting vibration more accurately, thereby avoiding the erroneous judgment of blasting vibration damage.

Description

Concussion of blasting safe evaluation method and system based on the input energy

Technical field

The present invention relates to the concussion of blasting security fields, be specifically related to the concussion of blasting signal test, record, analyze and the early warning that exceeds standard, particularly based on the input energy concussion of blasting safe evaluation method and system.

Background technology

Explosion is the important construction means of industry such as building, water conservancy, traffic, mine, is widely used in fields such as earthwork evacuation, tunnel piercing, side slope regulation, demolishing buildings, explosion fill.On the other hand, the secondary harm of engineering explosion mainly is the caused environmental vibration of explosion, particularly along with the propelling of Urbanization in China, a lot of engineering explosion point peripheries have more cities and towns infrastructure, residential block etc., as not influencing by the rational evaluation concussion of blasting, then probably cause contiguous construction cracking, destruction etc., even cause personnel and property loss.

Early stage concussion of blasting safe evaluation method often with the maximum of single intensive parameter as weighing the whether criterion of safety of structure.Near its key step: at first protected object, install the concussion of blasting testing sensor; the particle velocity or the particle acceleration waveform of test and record concussion of blasting; the peak volume and the safety standard of directly getting on the concussion of blasting waveform compare, to judge whether to satisfy safety.Selected safety standard mainly is peak value velocity of vibration or the peak value oscillatory acceleration that allows at present, and China's overpassed " shotfiring safety rules " promptly is to adopt particle peak value velocity of vibration as safety criterion (GB6722-86).Recently, some countries are when formulating the shotfiring safety evaluation criterion, begin to have considered the common influence of blasting vibration velocity and frequency gradually, concussion of blasting safety standard as states such as Germany, Switzerland, the U.S., Sweden, Czech, wherein foremost is the DIN4150 concussion of blasting safety standard of Germany and United States Bureau of Mines (USBM) and the surface mine safety standard that administrative office (OSMRE) proposes of reclaiming, and " the shotfiring safety rules " that China issued in 2003 (GB6722-2003) have also been considered the influence of concussion of blasting frequency.

When explosive charge, the quick-fried heart are identical apart from, minimum burden, the destructive characteristics of particle vibration velocity and building concerns closer, can reflect the concussion of blasting attenuation law generally.The subject matter that current concussion of blasting safety evaluation method exists in engineering practice is: (1) has only ignored structure self effects on dynamic properties with particle peak value velocity of vibration or particle peak value oscillatory acceleration as evaluation index, fail to reflect explosion dynamic response process and real bearing state, also can't disclose the mechanism of structural deterioration.(2) present concussion of blasting signal analysis method is often directly got peak value to the concussion of blasting waveform, perhaps to the concussion of blasting signal carry out wavelet transformation, the time-energy density calculation etc., still be weak aspect the means and methods that obtains concussion of blasting information.(3) present concussion of blasting safety evaluation standard mainly is applicable to the judgement whether constructure body structure destroys, and most impaired crackings that mainly show as attached members such as body of wall rendering layer, door-window opening, ground floor in house that influenced by concussion of blasting in the practice, improving inadequately of existing evaluation criterion causes often appearance erroneous judgement in the practice, fails to judge.(4) deficiency of existing method is embodied in: be judged as under the safe situation according to existing evaluation method, the house component cracking still can occur, this gives and instructs blast working and processing explosion dispute to cause very big difficulty and inconvenient.

Summary of the invention

The technical problem to be solved in the present invention is, overcome the problem that the evaluation index that exists in existing monitoring of blasting vibration and the concussion of blasting safety evaluation is too single, signal processing method is perfect inadequately, concussion of blasting harm erroneous judgement is failed to judge, improve the accuracy and the reliability of concussion of blasting security evaluation.

For solving the problems of the technologies described above, solution of the present invention is:

A kind of concussion of blasting safe evaluation method based on the input energy is provided, may further comprise the steps:

(1) shock wave that produces after detonate in the blast area is transmitted to three-component velocity of vibration sensor, and triggers concussion of blasting signals collecting instrument, the concussion of blasting ripple on three orthogonal directions of concussion of blasting signals collecting instrument record measuring point;

(2) concussion of blasting signals collecting instrument will be surveyed the concussion of blasting signal and be transferred to computer system, and pass to the empirical modal decomposition submodule of concussion of blasting safety evaluation module through data-interface;

(3) empirical modal decomposition submodule carries out the empirical modal decomposition to the concussion of blasting signal, extracts the intrinsic mode function component of concussion of blasting signal, and related data is committed to the Hilbert transformation submodule;

(4) the Hilbert transformation submodule is done the Hilbert conversion to the intrinsic mode function of concussion of blasting signal, calculates the Hilbert instantaneous energy value of this signal;

(5) Hilbert energy meter operator module is carried out integration to Hilbert instantaneous energy value, obtains total input energy TIE value;

(6) from concussion of blasting safety evaluation index library module, choose the critical TIE index of the blast area protected object that presets, with total input energy TIE value as concussion of blasting safety evaluation index; When the total input energy TIE value that obtains during less than this critical TIE index, then the blast area protected object is in the concussion of blasting safe condition, and main control unit sends the information of prompting safety to the display terminal of computer system; Otherwise destroying may appear in protected object, and main control unit sends the dangerous signal of prompting to the display terminal of computer system.

Further, the present invention also provides a kind of system that is used to realize preceding method, comprise at least one three-component velocity of vibration sensor and a concussion of blasting signals collecting instrument that is electrically connected with it, computer system also comprises a concussion of blasting safety evaluation module; Concussion of blasting safety evaluation module comprises main control unit, and the empirical modal that joins successively decomposes submodule, Hilbert transformation submodule and Hilbert energy meter operator module; Main control unit and empirical modal decompose submodule, Hilbert transformation submodule and Hilbert energy meter operator module and join respectively, and join respectively with the display terminal of concussion of blasting safety evaluation index library module, computer system; Concussion of blasting signals collecting instrument is connected to empirical modal through data-interface and decomposes submodule.

With respect to prior art, the invention has the beneficial effects as follows:

Adopt the inventive method, can calculate the total input energy TIE of concussion of blasting easily, and with TIE as concussion of blasting safety evaluation index.The TIE value is on the basis of the overall rule of peak value velocity of vibration index that has reflected existing rules, can carry out clearer and more definite, succinct quantification to dominant frequency, duration factor describes, more accurate to the concussion of blasting impact assessment, can avoid the erroneous judgement of concussion of blasting harm, have significant characteristic and advantage.

Description of drawings

Fig. 1 forms figure for the concussion of blasting test module;

Fig. 2 is a concussion of blasting safety evaluation modular structure schematic diagram;

Fig. 3 is the concussion of blasting safe evaluation method flow chart based on the input energy;

Fig. 4 is a concussion of blasting SIGNAL ENERGY ANALYSIS result map.

The specific embodiment

General technical route of the present invention:

Instantaneous energy analytic approach based on HHT (Hilbert-Huang Transform), at first adopt empirical modal to decompose (empirical mode decomposition, EMD) intrinsic mode function (the intrinsic mode function of extraction concussion of blasting signal, IMF) component, again IMF is made the total input energy TIE (Total Input Energy) of Hilbert transformation calculations signal, with TIE as concussion of blasting safety evaluation index.

One, concussion of blasting energy-balance equation

The energy-balance equation of single-degree-of-freedom system is:

${\∫}_0^{t}m\stackrel{\·\·}{x}\stackrel{\·}{x}\mathrm{dt}+{\∫}_0^{t}D\left(\stackrel{\·}{x}\right)\stackrel{\·}{x}\mathrm{dt}+{\∫}_0^{t}F\left(x\right)\stackrel{\·}{x}\mathrm{dt}={\∫}_0^t-m{\stackrel{\·\·}{x}}_0\stackrel{\·}{x}\mathrm{dt}---\left(1\right)$

E _v+E _D+E _H＝E ₁ (2)

In the formula (1), m is a system quality;

It is damping force; F (x) is a restoring force;

It is ground acceleration; X,

Be respectively relative displacement, speed, the acceleration response of structure.

In the formula (2), Be the relative kinetic energy of structure,

Be damping energy dissipation,

Be the deformation energy of structure,

For seismic facies to the input energy.

For the multiple degrees of freedom model under the concussion of blasting effect:

$\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\frac{1}{2}{m}_i{\left({\stackrel{\·}{x}}_i\right)}^2\left(t\right)+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\∫}_0^t{D}_i\left(\stackrel{\·}{x}\right){\stackrel{\·}{x}}_i\mathrm{dt}+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\∫}_0^t{F}_i\left(x\right){\stackrel{\·}{x}}_i\mathrm{dt}=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(-{\∫}_0^t{m}_i{\stackrel{\·\·}{x}}_0{\stackrel{\·}{x}}_i\mathrm{dt})---\left(3\right)$

$\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{E}_{\mathrm{vi}}+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{E}_{\mathrm{Di}}+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{E}_{\mathrm{hi}}=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{E}_i---\left(4\right)$

E in the formula _Vi, E _Di, E _HiDistribute and represent kinetic energy, damping energy and the hysteresis energy of building i layer, E _iBe the moving total input energy that is input to buildings or structures of explosion earthquake.Defining instantaneous input energy Δ E is the energy inputs of continuous two speed between zero point.Because speed is zero, the kinetic energy increment is zero, that is:

ΔE＝ΔE _D+ΔE _H (5)

$\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(-{\∫}_t^{t+\mathrm{\Δt}}{m}_i{\stackrel{\·\·}{x}}_0{\stackrel{\·}{x}}_i\mathrm{dt})=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\∫}_t^{t+\mathrm{\Δt}}{D}_i\left(\stackrel{\·}{x}\right){\stackrel{\·}{x}}_i\mathrm{dt}+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\∫}_t^{t+\mathrm{\Δt}}{F}_i\left(x\right){\stackrel{\·}{x}}_i\mathrm{dt}---\left(6\right)$

Definition Δ E is the energy increment that building experiences half vibrations circulation in the formula, and its corresponding Δ t is then for shaking the time of half period.After obtaining energy-balance equation, can adopt EMD and Hilbert transform method to find the solution.

Two, EMD method basic principle

Concussion of blasting is non-linear, non-stationary signal, the purpose of EMD method is that it is decomposed into a series of intrinsic mode functions (IMF) with different characteristic time scale, each intrinsic mode function satisfies following two conditions: (1) in whole data rows, the number of extreme point equates with the zero crossing number or differs one at the most; (2) in data rows more arbitrarily, the average of the envelope that envelope that is made of a little louder local pole and local minimum point constitute is always 0.If signal is X (t), its EMD decomposable process is as follows:

(1) determines all Local Extremum of signal, with the cubic spline function curve all maximal points are carried out interpolation then, the coenvelope line X of structure X (t) _Max(t).In like manner, obtain lower envelope line X _Min(t).The average line m of envelope then ₁(t):

m ₁(t)＝[X _max(t)+X _min(t)]/2 (7)

Subtract m with X (t) ₁(t) obtain h ₁(t): h ₁(t)=X (t)-m ₁(t).If h ₁(t) satisfy two conditions, the h so of IMF ₁(t) be exactly first IMF component of X (t).

(2) if h ₁(t) do not satisfy two conditions of IMF, h ₁(t) as primary signal, repeating step (1) obtains envelope average m up and down ₁₁(t), judge h again ₁₁(t)=h ₁(t)-m ₁₁(t) whether satisfy two conditions of IMF, as not satisfying, then continue screening, repetitive cycling k time obtains h _1k(t)=h _{1 (k-1)}(t)-m _1k(t).Must determine that a screening stop criterion is to judge h _1k(t) be the IMF component, can pass through standard deviation SD between two step sizing results of restriction:

$\mathrm{SD}=\underset{t=0}{\overset{T}{\mathrm{\Σ}}}\left|\frac{{|h_{1(k-1)}\left(t\right)-h_{1k}\left(t\right)|}^2}{h_{1(k-1)}^2\left(t\right)}\right|---\left(8\right)$

SD should get 0.2～0.3, works as h _1k(t) satisfy the requirement of SD, then h _1k(t) be first IMF component of X (t), be designated as c ₁(t), i.e. c ₁(t)=h _1k(t).

(3) with c ₁(t) from X (t), separate, obtain residual error r ₁(t)=X (t)-c ₁(t).

With r ₁(t) as primary signal, repeating step (1), (2) obtain n IMF, up to working as c _n(t) or r _n(t) less than predictive error, or residual error r _n(t) be that a monotonic function can not therefrom extract when satisfying the IMF component again, circulation finishes.So far, primary signal X (t) can be by n IMF component and a residual error r _n(t) constitute:

$X\left(t\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{c}_i\left(t\right)+r_n\left(t\right)---\left(9\right)$

Three, Hilbert conversion and instantaneous energy

Each IMF is done the Hilbert conversion

x _i(t)＝c _i(t) (10)

$Y_i\left(t\right)=\frac{1}{\mathrm{\π}}\mathrm{PV}\underset{R}{\∫}\frac{x\left(\mathrm{\τ}\right)}{t-\mathrm{\τ}}\mathrm{d\τ}---\left(11\right)$

PV is Cauchy's principal component in the formula, structure analytic signal z _i(t), promptly

$z_i\left(t\right)=x_i\left(t\right)+{\mathrm{iy}}_i\left(t\right)=a_i^{{\mathrm{ei\θ}}_i\left(t\right)}---\left(12\right)$

Amplitude function in the formula

Phase function θ _i(t)=arctan (y _i(t)/x _i(t)).Can obtain instantaneous frequency by phase function is

${\mathrm{\ω}}_i\left(t\right)=\frac{\mathrm{d\θ}}{\mathrm{dt}}---\left(13\right)$

Get by formula (7): ω _i(t) be the monotropic function of time, promptly given arbitrarily constantly corresponding frequency.Simultaneous formula (4)～(7) can be expressed as primary signal:

$X\left(t\right)=\mathrm{Re}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{a}_i\left(t\right)e^{{\mathrm{i\θ}}_i\left(t\right)}=\mathrm{Re}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{a}_i\left(t\right)e^{\∫{\mathrm{\ω}}_i\left(t\right)\mathrm{dt}}---\left(14\right)$

Here ignored discrepance, Re represents to get real part.The frequencies omega of formula (8) _i(t) and amplitude a _i(t) be the variable of time, (ω t), is called the Hilbert amplitude spectrum, is called for short the Hilbert spectrum can to constitute the three-dimensional time-frequency figure H of time, instantaneous frequency, amplitude.With amplitude square to frequency integrator, definable Hilbert instantaneous energy IE (Input Energy) is as follows:

$\mathrm{IE}\left(t\right)=\underset{\mathrm{\ω}}{\∫}{H}^2(\mathrm{\ω},t)\mathrm{d\ω}---\left(15\right)$

The Hilbert instantaneous energy provides signal energy situation over time.Total input energy TIE (Total Input Energy) is the integration of instantaneous energy curve, uses E _TExpression.

$E_T={\∫}_0^{t_0}\mathrm{IE}\left(t\right)\mathrm{dt}---\left(16\right)$

Four, concussion of blasting energy evaluation index

The response of building is not only relevant with the earthquake motion peak value with damage situations in the blasting process, still structure absorbs the process of energy and dissipation energy, thus Energy Analysis for High be a kind of reflect structure preferably under shock effect non-linear nature and three essential of earthquake motions to the method for structural seismic performance influence.Under the concussion of blasting effect, building is destroyed by shake and mainly contains first-passage failure and accumulated damage destruction dual mode.From the energy point of view analysis, maximum instantaneous input energy IE _MaxBe that concussion of blasting acts on structural ceiling capacity pulse, corresponding with the maximum displacement of structure, so maximum instantaneous input energy IE _MaxCan be used as and surmount the evaluation index that type destroys first.

Under strong explosion earthquake action was used, the building part can enter non-linear working state, and its vibrations total input energy is mainly dissipated by the inelastic deformation and the damping of building.On the other hand, in actual engineering, increasing heavy construction adopts big regional elementary errors relay blasting circuit, causes the concussion of blasting duration to extend to the several seconds even longer.The explosion seimic disaster census is the result also show, the middle low amplitude vibrations of these long durations can make construction cracking equally, produce inelastic deformation etc.Under this non-linear working state, surmount single index failure criteria first and have limitation, should consider the plasticity accumulated damage, be subjected to degree that concussion of blasting destroys mainly on how much the deciding of energy that building itself is imported, so be the concussion of blasting safety criterion with total input energy TIE (Total Input Energy).By the comparison of input energy and critical input energy, can pass judgment on the condition in damaged of building.

The embodiment that the present invention is concrete:

As shown in Figure 1, form module map, comprise one or more concussion of blasting signals collecting instrument, one or more three-component velocity of vibration sensors, a concussion of blasting safety evaluation module for blasting vibration test system provided by the present invention.Described concussion of blasting signals collecting instrument, three-component velocity of vibration sensor and concussion of blasting safety evaluation module adopt bus mode to be connected.

As shown in Figure 2, be concussion of blasting safety evaluation module provided by the invention.

Be used to realize the system of preceding method among the present invention, comprise at least one three-component velocity of vibration sensor and a concussion of blasting signals collecting instrument that is electrically connected with it, computer system also comprises a concussion of blasting safety evaluation module; Concussion of blasting safety evaluation module comprises main control unit, and the empirical modal that joins successively decomposes submodule, Hilbert transformation submodule and Hilbert energy meter operator module; Main control unit and empirical modal decompose submodule, Hilbert transformation submodule and Hilbert energy meter operator module and join respectively, and join respectively with the display terminal of concussion of blasting safety evaluation index library module, computer system; Concussion of blasting signals collecting instrument is connected to empirical modal through data-interface and decomposes submodule.

Each components and parts that relates among the present invention or the part of module or its function and purposes are described below:

(1) three-component velocity of vibration sensor: be used to pick up the particle vibration velocity on three directions of point position, and vibration signal is transferred to the concussion of blasting signal acquisition module.This sensor belongs to mature technology, has commercially available.

(2) concussion of blasting signals collecting instrument: mainly comprise: rechargable power supplies, memory, data-interface, embedded control unit, LCDs etc.Concussion of blasting signals collecting instrument is used to control three-component velocity of vibration sensor, and triggering thresholding, sample frequency, the signal of setting vibration signal write down parameters such as total time, the concussion of blasting signal that collects can be stored in the memory of this instrument temporarily, and data are delivered to signal analyse block handle, and the concussion of blasting test data can be transferred to computer behind the computer interconnection.This instrument belongs to mature technology, has commercially available.

(3) data line: be used to set up the contact between velocity of vibration sensor, signal acquisition module, signal analyse block and the computer, the line data communication of going forward side by side.

(4) concussion of blasting safety evaluation module: mainly comprise main control unit, data-interface and other auxiliary electrical element, following software function module is set with form curing or the non-cured form that is built in single-chip microcomputer:

Empirical modal decomposes submodule (empirical mode decomposition, EMD), adopt empirical modal to decompose (empirical mode decomposition to the concussion of blasting signal, EMD) intrinsic mode function (intrinsic mode function, the IMF) component of extraction concussion of blasting signal.

The Hilbert transformation submodule is done the Hilbert conversion to IMF, and calculates the Hilbert instantaneous energy of signal.

Hilbert energy meter operator module is carried out integration to the Hilbert instantaneous energy and is obtained total input energy TIE (Total Input Energy).

Concussion of blasting safety evaluation index library module, the critical TIE achievement data of built-in different protected object.

To the technology path of the present patent application file specific embodiment part and after realizing that principle is understood, those skilled in the art can be according to the understanding of oneself, use various software programming means, realize above-mentioned software function module, and then realize technical scheme of the present invention.

As shown in Figure 3, be concussion of blasting safe evaluation method flow chart provided by the present invention.Performing step is as follows:

(1) at point position three-component velocity of vibration sensor is installed.

(2) three-component velocity of vibration sensor is connected with concussion of blasting signals collecting instrument, the instrument startup self-detection, according to the difference of blasting scheme, vibrations are set trigger parameters such as thresholding, sample frequency, signal record total time, instrument is in waits for that concussion of blasting triggers state.

(3) if desired a plurality of measuring points are carried out monitoring of blasting vibration, then adopt a plurality of three-component velocity of vibration sensors and a plurality of concussion of blasting signals collecting instrument, repetition (1), (2) step.

(4) after detonated in the blast area, the shock wave that explosion produces was transmitted to three-component velocity of vibration sensor, and triggered concussion of blasting signals collecting instrument, noted the concussion of blasting ripple on three orthogonal directions of measuring point.

(5) concussion of blasting signals collecting instrument is connected with computer foundation, will survey the concussion of blasting signal and transfer to computer.

(6) adopt empirical modal to decompose (empirical mode decomposition, EMD) intrinsic mode function (intrinsic mode function, the IMF) component of extraction concussion of blasting signal to the concussion of blasting signal.

(7) IMF is done the Hilbert conversion, and calculate the Hilbert instantaneous energy of signal.

(8) the Hilbert instantaneous energy is carried out integration and obtains total input energy TIE (Total Input Energy), with TIE as concussion of blasting safety evaluation index.

(9) according to different protected objects; choose critical TIE index from concussion of blasting safety evaluation index storehouse, as the TIE that calculates during less than this critical TIE index, then protected object is in the concussion of blasting safe condition; otherwise then destroying may appear in protected object.

The response of building is not only relevant with vibrations peak velocity or acceleration with damage situations in the blasting process, still a structure absorbs the process of energy and dissipation energy, thus the analytical method that the present invention is based on the input energy be a kind of reflect structure preferably under shock effect non-linear nature and the vibrations three elements to the method for structural seismic performance influence.With total input energy TIE (Total Input Energy) is that the concussion of blasting safety criterion is feasible and advanced, and whether by the comparison of input energy and critical input energy, it is impaired to pass judgment under concussion of blasting building.

With certain shallow tunnel blast working hazard assessment is the example explanation specific embodiment.The about 20m of this shallow tunnel buried depth, the about 130m of shallow embedding segment length, tunnel upper have intensive house owed by a citizen, factory building and simple and easy tile-roofed house, and the construction standard is lower, and shock resistance is low, need carry out vibrations that Tunnel Blasting construction the causes appraisal to face of land Influence on Architecture.According to aforementioned concussion of blasting total input energy TIE (Total Input Energy) computational methods, calculate the vibration data of 33 digital electronic detonator blastings, 31 common millisecond detonator explosions and be summarized in Fig. 4.As seen the TIE value of digital electronic detonator blasting vibration signal is all less, generally all less than 0.2; And the TIE value of the 4th, 15 common millisecond detonator concussion of blasting signal is greater than 1, compares significantly bigger than normally with other numerical value, shows that the vibrations cumulative effect of the 4th, 15 common millisecond detonator explosion is more outstanding.

To list in table 1 according to result's contrast that different concussion of blasting hazard assessment methods obtain.Wherein particle peak value velocity of vibration index is (GB6722-2003) recommend method of China's " shotfiring safety rules ".According to actual seimic disaster census, all digital electronic detonator blastings all do not cause house crack, have realized effective damping control; But the 4th and the 15th common millisecond detonator concussion of blasting have caused the ground house crack.As seen three kinds of methods differentiation results contrast in actual earthquake and the table 1: (1) all methods judge that all the 4th concussion of blasting exceeds standard, and consistent with actual seimic disaster census.(2) according to particle peak value velocity of vibration index, judged result has comprised the 4th, the 15th separate explosion of actual house crack, although also there are other 3 separate explosion particle peak value velocity of vibrations to surpass 2cm/s, does not find actual cracking.(3) instantaneous energy peak value index can identify the house crack phenomenon of the 4th explosion, but the 15th separate explosion of having failed to judge.(4) the total input energy TIE discriminant criterion of the present invention's proposition and actual seimic disaster census coincide, and have obtained effect preferably.

Table 1 concussion of blasting hazard assessment result

Adopt the inventive method, can calculate the total input energy TIE (Total Input Energy) of concussion of blasting easily, and with TIE as concussion of blasting safety evaluation index.The TIE value is on the basis of the overall rule of peak value velocity of vibration index that has reflected existing rules, can carry out clearer and more definite, succinct quantification to dominant frequency, duration factor describes, more accurate to the concussion of blasting impact assessment, can avoid the erroneous judgement of concussion of blasting harm, have significant characteristic and advantage.

At last, it should be noted that above what enumerate only is specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged.In implication suitable and any change in the scope, all should think to be included in the scope of claims with claims of the present invention.

Claims (2)

1. based on the concussion of blasting safe evaluation method of input energy, may further comprise the steps:

(1) shock wave that produces after detonate in the blast area is transmitted to three-component velocity of vibration sensor, and triggers the concussion of blasting ripple on three orthogonal directions of concussion of blasting signals collecting instrument record measuring point;

(2) concussion of blasting signals collecting instrument will be surveyed the concussion of blasting signal and be transferred to computer system, and pass to the empirical modal decomposition submodule of concussion of blasting safety evaluation module through data-interface;

(3) empirical modal decomposition submodule carries out the empirical modal decomposition to the concussion of blasting signal, extracts the intrinsic mode function component of concussion of blasting signal, and related data is committed to the Hilbert transformation submodule;

(4) the Hilbert transformation submodule is done the Hilbert conversion to the intrinsic mode function of concussion of blasting signal, calculates the Hilbert instantaneous energy value of this signal;

(5) Hilbert energy meter operator module is carried out integration to Hilbert instantaneous energy value, obtains total input energy TIE value;

(6) from concussion of blasting safety evaluation index library module, choose the critical TIE index of the blast area protected object that presets, with total input energy TIE value as concussion of blasting safety evaluation index; When the total input energy TIE value that obtains during less than this critical TIE index, then the blast area protected object is in the concussion of blasting safe condition, and main control unit sends the information of prompting safety to the display terminal of computer system; Otherwise destroying may appear in protected object, and main control unit sends the dangerous signal of prompting to the display terminal of computer system.

2. one kind is used to realize the described system based on the concussion of blasting safe evaluation method of importing energy of claim 1, comprise at least one three-component velocity of vibration sensor and a concussion of blasting signals collecting instrument that is electrically connected with it, it is characterized in that described computer system also comprises a concussion of blasting safety evaluation module; Broken vibrations safety evaluation module comprises main control unit, and the empirical modal that joins successively decomposes submodule, Hilbert transformation submodule and Hilbert energy meter operator module; Main control unit and empirical modal decompose submodule, Hilbert transformation submodule and Hilbert energy meter operator module and join respectively, and join respectively with the display terminal of concussion of blasting safety evaluation index library module, computer system; Concussion of blasting signals collecting instrument is connected to empirical modal through data-interface and decomposes submodule.

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