CN115183643A - Safe construction method for controlling blasting noise and shock wave of tunnel close to residential area - Google Patents
Safe construction method for controlling blasting noise and shock wave of tunnel close to residential area Download PDFInfo
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- CN115183643A CN115183643A CN202210702655.8A CN202210702655A CN115183643A CN 115183643 A CN115183643 A CN 115183643A CN 202210702655 A CN202210702655 A CN 202210702655A CN 115183643 A CN115183643 A CN 115183643A
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- 238000005422 blasting Methods 0.000 title claims abstract description 160
- 230000035939 shock Effects 0.000 title claims abstract description 50
- 238000010276 construction Methods 0.000 title claims abstract description 43
- 238000009413 insulation Methods 0.000 claims abstract description 38
- 238000012544 monitoring process Methods 0.000 claims abstract description 19
- 238000005192 partition Methods 0.000 claims abstract description 12
- 238000009412 basement excavation Methods 0.000 claims abstract description 8
- 238000013461 design Methods 0.000 claims abstract description 7
- 238000005553 drilling Methods 0.000 claims abstract description 7
- 238000011156 evaluation Methods 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 15
- 238000005520 cutting process Methods 0.000 claims description 13
- 230000005641 tunneling Effects 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 6
- 239000002360 explosive Substances 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 abstract 2
- 230000007613 environmental effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D5/00—Safety arrangements
- F42D5/04—Rendering explosive charges harmless, e.g. destroying ammunition; Rendering detonation of explosive charges harmless
- F42D5/045—Detonation-wave absorbing or damping means
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a safe construction method for controlling blasting noise and shock waves of a tunnel close to a residential area, and aims to effectively absorb or obstruct noise and air shock waves generated in blasting construction in the blasting area so as to reduce the influence on a non-blasting area, namely the residential area close to the residential area. The safe construction method comprises a working preparation stage, a tunnel entry mechanical excavation stage and a tunnel body sound insulation and wave resistance control blasting stage, wherein the tunnel body sound insulation and wave resistance control blasting stage comprises three stages of blasting parameter dynamic design before blasting operation, influence partition evaluation aiming at a primarily determined blasting scheme, blasting scheme determination and influence partition control measure determination, drilling and blasting construction, in-situ monitoring is synchronously implemented in a non-blasting area during construction, and influence partition control measures are timely adjusted according to shock wave overpressure, noise decibel and vibration velocity data obtained by in-situ monitoring.
Description
Technical Field
The invention belongs to the technical field of tunnel construction, and particularly relates to a safe construction method for controlling blasting noise and shock waves of a tunnel close to a residential area.
Background
The drilling and blasting method is a construction method which is the mainstream of tunnel engineering, a large amount of noise and shock waves can be generated during blasting construction, and poor social influence can be caused to the tunnel construction of a neighboring residential area by a little carelessness, so that how to reduce the noise pollution and the shock wave destruction effect in the construction process of the protection drilling and blasting method is a technical problem to be solved urgently at present.
Disclosure of Invention
The invention mainly aims to provide a tunnel blasting noise and shock wave control safety construction method close to a residential area, and aims to effectively absorb or block noise and air shock waves generated in blasting construction in a blasting area so as to reduce the influence on a non-blasting area, namely a neighboring residential area.
Therefore, the safety construction method for controlling the blasting noise and the shock wave of the tunnel close to the residential area provided by the embodiment of the invention comprises the following steps:
s1, preparation working stage
Determining air shock wave overpressure control value delta P according to building protection grade and personnel health requirement Control value Blasting noise control value L p control value And blasting vibration velocity control value V Control value ；
S2, mechanical excavation stage for tunnel entrance
Adopting a mechanical excavation mode within a certain range of the excavated entry, and applying a sound-insulation wave-blocking door opening structure (patent application number: 202120715020.2, a sound-insulation wave-blocking door opening structure for tunnel blasting construction) in time after the door opening construction condition is met;
s3, controlling blasting stage by sound insulation and wave resistance of tunnel body
S31, dividing the tunnel into a blasting area and a non-blasting area by the sound insulation wave-blocking door opening structure applied in the early stage, excavating the tunnel by adopting a differential blasting technology, dynamically designing blasting parameters before blasting operation, and dynamically adjusting the blasting parameters once in each operation cycle of the tunnel face; the specific process of dynamic design of blasting parameters is as follows: firstly, preliminarily designing a tunnel face tunneling blasting scheme before blasting operation to obtain the dosage Q of a designed cut section, and then predicting a formula and vibrating according to air shock wave overpressureThe rapid prediction formula is used for calculating the tunneling distances R of different tunnel faces Advancing Maximum dosage Q of lower cutting section max When Q > Q max When Q is less than Q, the design of blasting scheme is carried out again max Firstly determining a blasting scheme, and entering the next step;
s32, carrying out influence partition evaluation on the preliminarily determined blasting scheme
According to an air shock wave overpressure prediction formula and a vibration velocity prediction formula, overpressure values and vibration velocities under the conditions of preliminarily designed slitting dosage Q and explosion center distance R are predicted, and overpressure prediction values delta P are obtained Prediction value Predicted value V of vibration velocity Prediction value And control index delta P Control value 、V Control value Comparing; wherein the content of the first and second substances,
when Δ P Prediction value ≥ΔP Control value ，V Prediction value ≥V Control value Meanwhile, the blasting area is divided into severe influence areas, at the moment, a blasting scheme needs to be redesigned, the dosage of the channeling section is reduced, and meanwhile, a sound insulation and wave resistance trolley (patent No. ZL 2021 49320579.7, a structure of the sound insulation and wave resistance trolley for the drilling and blasting method tunnel) is timely installed in the blasting area of the tunnel;
when Δ P Prediction value ＜0.8ΔP Control value ，V Prediction value ＜0.8V Control value Then, dividing the blasting area into weak influence areas, and directly controlling blasting according to the preliminarily determined blasting scheme;
when Δ P Prediction value And Δ P Control value And V Prediction value And V Control value Under other conditions, dividing the blasting area into slightly-affected areas, and installing a sound-insulation wave-blocking trolley in the tunnel blasting area in time;
s33, carrying out drilling and blasting construction after the blasting scheme and the influence partition control measure are determined, synchronously carrying out field monitoring in a non-blasting area during construction, and obtaining the overpressure delta P of the shock wave according to the field monitoring Test value Decibel L, noise p test value Sum vibration velocity V Test value Data are adjusted in time to influence partition control measures; wherein the content of the first and second substances,
when Δ P Test value ≥ΔP Control value ，V Test value ≥V Control value ，L p test value ≥L p control value When the distance between the sound-insulation wave-blocking trolley in the tunnel and the tunnel face needs to be shortened, and meanwhile, the sound-insulation wave-blocking door opening is changed into a double-layer sound-insulation wave-blocking structure;
when Δ P is Test value ＜0.8ΔP Control value ，V Test value ＜0.8V Control value ，L p test value ＜0.8L p control value Directly controlling blasting according to the preliminarily determined blasting scheme;
when Δ P Test value And Δ P Control value 、V Test value And V Control value And L p test value And L p control value When other conditions are met, the distance between the sound-insulation wave-resistance trolley in the tunnel and the tunnel face needs to be shortened.
Specifically, measuring points are arranged at the corner of a residential building closest to the tunnel portal, and a blasting tester is used for collecting vibration, air shock wave and noise data.
Specifically, the expression of the air shock wave overpressure prediction formula is as follows:
wherein: q is the dosage of the cutting section, and R is the distance between the explosive centers;
specifically, the vibration velocity prediction formula has the expression:
wherein: r is the distance between the blasting centers, Q is the dosage of the cutting section, V is the vibration velocity, and K and alpha are respectively the coefficient and attenuation index related to the terrain and geological conditions between the blasting points and the protected object.
In particular, the air shock wave overpressure control value Δ P Control value The value of (B) is equal to 2.0kPa.
Specifically, the blasting noise control value L p control value The value of (A) is 110dB at night according to different timeAnd 125db is taken during the day.
Specifically, the blasting vibration control value V of the ground building Control value Determining the type of the protected object and the main frequency f of the monitoring point; wherein the content of the first and second substances,
situation one, when the protected object is rubble house
When f is less than or equal to 10Hz, V Control value The value of 0.15-0.45/cm & s -1 ；
When 10Hz<When f is less than or equal to 50Hz, V Control value The value of 0.5 to 0.9/cm & s -1 ；
When f is>At 50Hz, V Control value The value of 0.9-1.5/cm & s -1 ；
Second, when the protected object is a civil building
When f is less than or equal to 10Hz, V Control value Value of 1.5-2.0/cm & s -1 ；
When 10Hz<When f is less than or equal to 50Hz, V Control value Value of 2.0-2.5/cm & s -1 ；
When f is>At 50Hz, V Control value The value is 2.5-3.0/cm.s -1 。
Compared with the prior art, at least one embodiment of the invention has the following beneficial effects: according to the invention, the tunnel is divided into the blasting area and the non-blasting area through the sound-insulation wave-blocking door opening structure, the environmental influence of blasting noise and air shock waves is considered, the environmental influence evaluation is carried out on the blasting scheme, the zone control measures are adopted, the blasting parameters are dynamically adjusted, the dosage of the undercutting section at different tunneling distances on the tunnel face is strictly controlled, the zone control measures are dynamically adjusted according to synchronous monitoring data of a construction site, the blasting noise and the air shock waves accompanying the rock breaking of the explosive are absorbed or blocked in the blasting area on the premise of ensuring the construction safety and not influencing the construction progress, the fine control of the tunnel blasting process is realized, and the influence on neighboring residents in the non-blasting area can be reduced to the maximum extent.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of tunnel blasting construction according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the arrangement of shock wave measuring points in a non-blasting area of a tunnel according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1, a method for controlling safe construction by blasting noise and shock waves of a tunnel close to a residential area comprises the following steps:
s1, preparation working stage
Carrying out environmental survey of residential areas, wherein the survey contents comprise the structure type of buildings in the residential areas, the safety condition of the structures of the buildings and the plane position of surrounding buildings, and determining the nearest position and the minimum distance R between the buildings and the opening min Inquiring 'blasting safety regulation GB 6722-2014' (blasting regulation for short), and determining the air shock wave overpressure control value delta P according to the building protection grade and personnel health requirements Control value Blasting noise control value L p control value And blasting vibration velocity control value V Control value 。
S2, mechanical excavation stage for tunnel entrance
In the range of 5-10 m of a tunnel opening, adopting methods of mechanically excavating a tunnel, matching with an arch-sleeving vertical frame, advance support, short-footage excavation, step method for retaining core soil, timely sealing an inverted arch and the like to ensure the safety of the tunnel after entering the tunnel, and timely constructing a sound-insulation wave-blocking door opening structure after having the conditions, as shown in figure 2;
s3, controlling blasting stage by sound insulation and wave resistance of tunnel body
S31, dividing the tunnel into a blasting area and a non-blasting area by the sound insulation wave-blocking door opening structure applied in the early stage, excavating the tunnel by adopting a differential blasting technology, dynamically designing blasting parameters before blasting operation, and dynamically adjusting the blasting parameters once in each operation cycle of the tunnel face; the specific process of dynamic design of blasting parameters is as follows: firstly, preliminarily designing a tunnel face tunneling blasting scheme before blasting operation to obtain the dosage Q of a designed cut section, and then calculating the tunneling distances R of different tunnel faces according to an air shock wave overpressure prediction formula and a vibration velocity prediction formula Advancing Maximum dosage Q of lower cutting section max When Q > Q max When Q is less than Q, the design of blasting scheme is carried out again max Firstly determining a blasting scheme, and entering the next step;
the expression of the air shock wave overpressure prediction formula is (detonation rule bar 13.3.2)):
the vibration velocity prediction formula has the expression (explosive rule bar 13.2.4):
wherein: r is the distance between the blasting centers, Q is the dosage of the cutting section, V is the vibration velocity, and K and alpha are respectively the coefficient and attenuation index related to the terrain and geological conditions between the blasting points and the protected object.
Taking a certain expressway tunnel in Guizhou as an example, the distance between the tunnel entrance and the nearest building is 45m, and at the moment, each tunneling distance R Advancing The dosage Q of the cutting section meets the requirement of table 1.
Table 1 maximum dosage calculation table for cutting section
| Tunnel face tunneling distance R Advancing /m | 10 | 20 | 30 | 50 | 75 | 100 |
| Distance of detonation center R General assembly /m | 55 | 65 | 75 | 95 | 120 | 145 |
| Maximum dose Q of cutting section max /kg | 0.8 | 1.4 | 1.9 | 4.2 | 8.5 | 15.0 |
S32, carrying out influence partition evaluation on the preliminarily determined blasting scheme
According to an air shock wave overpressure prediction formula and a vibration velocity prediction formula, overpressure values and vibration velocities under the conditions of preliminarily designed slitting dosage Q and explosion center distance R are predicted, and overpressure prediction values delta P are obtained Prediction value Predicted value V of vibration velocity Prediction value And control index delta P Control value 、V Control value Comparing; wherein the content of the first and second substances,
when Δ P Prediction value ≥ΔP Control value ，V Prediction value ≥V Control value Meanwhile, the blasting area is divided into severe influence areas, at the moment, a blasting scheme needs to be redesigned, the dosage of the cutting section is reduced, and meanwhile, a sound insulation and wave resistance trolley is timely installed in the tunnel blasting area;
when Δ P Prediction value ＜0.8ΔP Control value ，V Prediction value ＜0.8V Control value Then, dividing the blasting area into weak influence areas, and directly controlling blasting according to the preliminarily determined blasting scheme;
when Δ P Prediction value And Δ P Control value And V Prediction value And V Control value Under other conditions, namely when the two conditions are not met, the blasting area is divided into slightly-affected areas, and at the moment, a sound-insulation wave-blocking trolley needs to be installed in the tunnel blasting area in time;
the sound insulation wave blocking door opening structure and the wave blocking door curtain of the sound insulation wave blocking trolley are closed during blasting, the rest time is in an open state, traffic transportation and ventilation in the tunnel are guaranteed, and the sound insulation wave blocking trolley moves forwards along with tunnel face tunneling. As for the concrete structures of the sound-insulation wave-blocking door opening structure and the sound-insulation wave-blocking trolley, the structures are the prior art and are not described herein again.
S33, carrying out drilling and blasting construction after the blasting scheme and the influence partition control measure are determined, synchronously carrying out field monitoring in a non-blasting area during construction, and obtaining the overpressure delta P of the shock wave according to the field monitoring Test value Decibel of noise L p test value Sum vibration velocity V Test value Data are adjusted in time to influence partition control measures; wherein the content of the first and second substances,
when Δ P Test value ≥ΔP Control value ，V Test value ≥V Control value ，L p test value ≥L p control value When the distance between the sound-insulation wave-blocking trolley in the tunnel and the tunnel face needs to be shortened, and meanwhile, the sound-insulation wave-blocking door opening is changed into a double-layer sound-insulation wave-blocking structure (namely, a double-layer wave-blocking door curtain is designed);
when Δ P Test value ＜0.8ΔP Control value ，V Test value ＜0.8V Control value ，L p test value ＜0.8L p control value Directly controlling blasting according to the preliminarily determined blasting scheme;
when Δ P Test value And Δ P Control value 、V Test value And V Control value And L p test value And L p control value When other conditions are met, namely the two conditions are not met, the distance between the sound-insulation wave-blocking trolley in the tunnel and the tunnel face needs to be shortened.
According to the invention, the tunnel is divided into the blasting area and the non-blasting area through the sound-insulation wave-blocking door opening structure, the environmental influence of blasting noise and air shock waves is considered, the environmental influence evaluation is carried out on the blasting scheme, the zone control measures are adopted, the blasting parameters are dynamically adjusted, the dosage of the undercutting section at different tunneling distances on the tunnel face is strictly controlled, the zone control measures are dynamically adjusted according to synchronous monitoring data of a construction site, the blasting noise and the air shock waves accompanying the rock breaking of the explosive are absorbed or blocked in the blasting area on the premise of ensuring the construction safety and not influencing the construction progress, the fine control of the tunnel blasting process is realized, and the influence on neighboring residents in the non-blasting area can be reduced to the maximum extent.
Specifically, the specific process of synchronously implementing on-site monitoring in a non-blasting area in construction comprises the following steps:
(1) and monitoring the blast shock wave. And arranging measuring points in a key area of a non-blasting area outside the tunnel, monitoring data by using a blasting tester, and as shown in figure 3, arranging measuring points at the corner of the house closest to the tunnel portal and collecting air shock wave overpressure data. The shock wave overpressure required by the health of residents in residential areas should not exceed 2.0kPa, and the shock wave overpressure required by the structural safety of various types of buildings should meet the regulations of Table 2.
TABLE 2 overpressure control values for safety shock waves of various types of building structures
| Types of | Glass | Wood door and window | Brick outer wall | Wood house cover | Tile roof | Reinforced concrete roof house | Reinforced concrete column |
| overpressure/kPa | 2 | 2 | 2～9 | 2～9 | 2 | 9～25 | 40～55 |
(2) And detecting the blasting noise. The blasting noise belongs to instantaneous noise, and the monitoring result is the highest decibel of noise. The measuring point arrangement is the same as the blast shock wave monitoring scheme. And burst noise is exploded in construction plants such as mines, water conservancy projects, traffic, railways, capital constructions and the like. Night does not exceed 110dB (A), day does not exceed 125dB (A).
(3) And (5) monitoring the blasting vibration speed. The measuring points are selected as the peak vibration speed of the mass point of the foundation of the protected object, and the arrangement of the measuring points is the same as that of the blast shock wave monitoring scheme. The blast vibration control value for the surface building should be determined in conjunction with the protected object and the particle dominant frequency, as shown in table 3.
Table 3 blasting vibration safety allowable control value ([ cm ] s) -1 )
| Protected object classes | f≤10Hz | 10Hz<f≤50Hz | f>50Hz |
| Rubble house | 0.15～0.45 | 0.5～0.9 | 0.9～1.5 |
| General civil buildings | 1.5～2.0 | 2.0～2.5 | 2.5～3.0 |
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the number is large and cannot be exhaustive, some of the numbers are disclosed to exemplify the technical solutions of the present invention, and the above-mentioned numbers should not be construed as limiting the scope of the present invention.
Meanwhile, if the invention as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated. Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it necessary or exhaustive for all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (7)
1. A safety construction method for controlling blasting noise and shock waves of a tunnel close to a residential area is characterized by comprising the following steps:
s1, preparation working stage
Determining air shock wave overpressure control value delta P according to building protection grade and personnel health requirement Control value Blasting noise control value L p control value And blasting vibration velocity control value V Control value ；
S2, mechanical excavation stage for tunnel entrance
Adopting mechanical excavation within a certain range of excavation entry, and constructing a sound insulation and wave blocking door opening structure in time after the door opening construction condition is met;
s3, controlling blasting stage by sound insulation and wave resistance of tunnel body
S31, dividing the tunnel into a blasting area and a non-blasting area by a sound insulation and wave blocking door opening structure applied in the early stage, excavating the tunnel by adopting a differential blasting technology, dynamically designing blasting parameters before blasting operation, and dynamically adjusting the blasting parameters once in each operation cycle of the tunnel face; the specific process of dynamic design of blasting parameters is as follows: firstly, preliminarily designing a tunnel face tunneling blasting scheme before blasting operation to obtain the dosage Q of a designed cut section, and then calculating the tunneling distances R of different tunnel faces according to an air shock wave overpressure prediction formula and a vibration velocity prediction formula Advancing Maximum dosage Q of lower cutting section max When Q > Q max When Q is less than Q, the design of blasting scheme is carried out again max Then, the blasting scheme is preliminarily determined, and the next blasting scheme is enteredA step of;
s32, carrying out influence partition evaluation on the preliminarily determined blasting scheme
According to an air shock wave overpressure prediction formula and a vibration velocity prediction formula, overpressure values and vibration velocities under the conditions of preliminarily designed slitting dosage Q and explosion center distance R are predicted, and overpressure prediction values delta P are obtained Prediction value Predicted value V of vibration velocity Prediction value And control index Δ P Control value 、V Control value Carrying out comparison; wherein the content of the first and second substances,
when Δ P Prediction value ≥ΔP Control value ，V Prediction value ≥V Control value Meanwhile, the blasting area is divided into severe influence areas, at the moment, a blasting scheme needs to be redesigned, the dosage of the cutting section is reduced, and meanwhile, a sound insulation and wave resistance trolley is timely installed in the tunnel blasting area;
when Δ P Prediction value ＜0.8ΔP Control value ，V Prediction value ＜0.8V Control value Then, dividing the blasting area into weak influence areas, and directly controlling blasting according to the preliminarily determined blasting scheme;
when Δ P Prediction value And Δ P Control value And V Prediction value And V Control value Under other conditions, dividing the blasting area into slightly-affected areas, and installing a sound-insulation wave-blocking trolley in the tunnel blasting area in time;
s33, carrying out drilling and blasting construction after the blasting scheme and the influence partition control measure are determined, synchronously carrying out field monitoring in a non-blasting area during construction, and obtaining the overpressure delta P of the shock wave according to the field monitoring Test value Decibel L, noise p test value Sum vibration velocity V Test value Data are adjusted in time to influence partition control measures; wherein, the first and the second end of the pipe are connected with each other,
when Δ P Test value ≥ΔP Control value ，V Test value ≥V Control value ，L p test value ≥L p control value When the distance between the sound-insulation wave-blocking trolley in the tunnel and the tunnel face needs to be shortened, and meanwhile, the sound-insulation wave-blocking door opening is changed into a double-layer sound-insulation wave-blocking structure;
when Δ P Test value ＜0.8ΔP Control value ，V Test value ＜0.8V Control value ，L p test value ＜0.8L p control value Directly controlling blasting according to the preliminarily determined blasting scheme;
when Δ P Test value And Δ P Control value 、V Test value And V Control value And L p test value And L p control value When other conditions are met, the distance between the sound-insulation wave-resistance trolley in the tunnel and the tunnel face needs to be shortened.
2. The safety construction method for controlling blasting noise and shock waves of tunnels in close proximity to residential areas according to claim 1, wherein: and arranging measuring points at the corner of the residential building closest to the tunnel portal, and collecting data of vibration, air shock waves and noise by using a blasting tester.
3. The safety construction method for controlling blasting noise and shock waves of tunnels in close proximity to residential areas according to claim 1, wherein: the expression of the air shock wave overpressure prediction formula is as follows:
wherein: q is the dosage of the cutting section, and R is the distance between the explosive centers.
4. The safety construction method for controlling blasting noise and shock waves of tunnels in close proximity to residential areas according to claim 1, wherein: the vibration velocity prediction formula has the expression:
wherein: r is the distance between the blasting centers, Q is the dosage of the cutting section, V is the vibration velocity, K and alpha are the coefficient and attenuation index related to the terrain and geological conditions between the blasting point and the protected object.
5. The close proximity dwelling of claim 1The civil area tunnel blasting noise and shock wave control safe construction method is characterized by comprising the following steps of: air shock wave overpressure control value delta P Control value The value of (B) is equal to 2.0kPa.
6. The safety construction method for controlling blasting noise and shock waves of a tunnel adjacent to a residential area according to claim 1, wherein: blasting noise control value L p control value The values of (a) are taken at 110db at night and 125db at day, for different times.
7. The safety construction method for controlling blasting noise and shock waves of tunnels in close proximity to residential areas according to claim 1, wherein: blasting vibration control value V of ground building Control value Determining the type of the protected object and the main frequency f of the monitoring point; wherein the content of the first and second substances,
situation one, when the protected object is rubble house
When f is less than or equal to 10Hz, V Control value The value of 0.15-0.45/cm & s -1 ；
When 10Hz<When f is less than or equal to 50Hz, V Control value Value of 0.5-0.9/. Cm.s -1 ；
When f is>At 50Hz, V Control value The value of 0.9-1.5/cm & s -1 ；
Second, when the protected object is a civil building
When f is less than or equal to 10Hz, V Control value Value of 1.5-2.0/cm & s -1 ；
When 10Hz<When f is less than or equal to 50Hz, V Control value Value of 2.0-2.5/cm & s -1 ；
When f is>At 50Hz, V Control value The value is 2.5-3.0/cm.s -1 。
Priority Applications (1)
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| CN212030353U (en) * | 2020-03-31 | 2020-11-27 | 中铁三局集团第四工程有限公司 | Movable combined trolley for reducing damage of tunnel blasting shock waves and noise |
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| JPH06249599A (en) * | 1993-02-26 | 1994-09-06 | Sato Kogyo Co Ltd | Expert system of blasting control |
| KR20000061481A (en) * | 1999-03-26 | 2000-10-25 | 이정인 | Method for designing a tunnel-blasting pattern diagram and Recording medium with a program for providing a tunnel-blasting pattern diagram |
| KR20080003131U (en) * | 2007-02-02 | 2008-08-06 | 이동현 | Blasting noise decrease method of tunnel |
| CN203685222U (en) * | 2013-12-28 | 2014-07-02 | 中铁十二局集团第二工程有限公司 | Sound attenuation trolley for tunnel blast working |
| CN104315934A (en) * | 2014-09-30 | 2015-01-28 | 西南交通大学 | Prevention device and prevention method used for blasting air shock waves in drilling and blasting tunnel |
| CN204495212U (en) * | 2014-09-30 | 2015-07-22 | 西南交通大学 | A kind of preventing mean for boring Air blast wave in quick-fried Tunnel |
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| CN107063017A (en) * | 2016-12-24 | 2017-08-18 | 中铁十八局集团有限公司 | It is a kind of to reduce the empty eye mud vibration damping controlled blasting method in the tunnel of vibrations and noise |
| CN111336876A (en) * | 2020-03-31 | 2020-06-26 | 山东科技大学 | Method for reducing damage of tunnel blasting shock waves and noise |
| CN212030353U (en) * | 2020-03-31 | 2020-11-27 | 中铁三局集团第四工程有限公司 | Movable combined trolley for reducing damage of tunnel blasting shock waves and noise |
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