CN110287597B - Method for calculating sudden increase of suspended sand in sea area in initial stage caused by blasting and silt squeezing - Google Patents
Method for calculating sudden increase of suspended sand in sea area in initial stage caused by blasting and silt squeezing Download PDFInfo
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Abstract
The invention discloses a method for calculating sudden increase of sea area suspended sand in an initial stage caused by blasting compaction. Before blasting, the method can be combined with an engineering scheme, negative effects possibly caused to the ecological environment of the surrounding sea area due to overhigh concentration of suspended sand in the water body can be effectively evaluated, the corresponding engineering scheme can be corrected, and the method has strong practicability and wide applicability.
Description
Technical Field
The invention relates to a calculation method for sea area suspended sand sudden increase, in particular to a calculation method for sea area suspended sand sudden increase in an initial stage caused by blasting and silt squeezing, and belongs to the technical field of hydraulic engineering.
Background
The explosion silt-squeezing stone-filling method is a common soft foundation treatment method in the construction of muddy coast engineering.
The bottom bed sediment is extremely easy to disturb and re-suspend in the process of explosive filling and explosive tamping, and when the explosive intensity is large enough, the bottom bed sediment can even re-enter the water body in a splashing mode and form a visible explosion pit on the bottom bed. Due to the particularity of the blasting and silt squeezing construction process, the phenomenon that the content of suspended sand in a construction sea water body is increased suddenly is easily caused in the construction process, and high-concentration suspended sand water clusters are formed. Due to the overhigh concentration of the suspended sand in the water body, negative effects can be caused to the ecological environment of the surrounding sea area, particularly when the content of the suspended sand reaches 0.3kg/m 3 In the above, the negative effect on the ecological environment is particularly remarkable, so that in the evaluation of the influence of the marine environment, particularly when sensitive targets exist in a construction sea area, the phenomenon of suspended sand suddenly increasing caused by blasting and silt squeezing and the transportation and diffusion process under the hydrodynamic action are concerned.
Due to the destructiveness and instantaneity of blasting compaction construction, a monitor can enter a construction area for field observation after blasting, but at the moment, the suspended sand increment caused by blasting compaction is rapidly transported and diffused under the hydrodynamic action, so that the original form of the initial stage of blasting is difficult to maintain; therefore, the phenomenon of sudden increase of suspended sand in the instantaneous blasting stage is difficult to realize synchronous observation and evaluation at present, so that the strength, the range and the like of sudden increase of suspended sand in the sea area in the initial blasting and silt squeezing stage are difficult to clearly obtain all the time.
In summary, a method for directly calculating the increment of suspended matters in the peripheral sea area caused by blasting, silt-squeezing and rock-filling construction is needed to accurately calculate the concentration of high-sand-containing water clusters near the blasting point in the initial blasting, silt-squeezing and rock-filling stage.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a method for accurately calculating the increment of the suspended sand in the sea area in the initial stage caused by blasting and silt squeezing.
In order to achieve the above object, the present invention adopts the following technical solutions:
a method for calculating sudden increase of suspended sand in sea area in initial stage caused by blasting and silt squeezing comprises the following steps:
s1, the engineering scheme of treating the sea foundation by blasting and silt squeezing comprises the steps of arranging quantitative explosive charges at equal intervals on the rockfill dyke head and the dyke bodies on the two sides in a single-point source mode to perform detonation operation;
s2, determining blasting parameters according to an engineering scheme, and calculating the linear explosive quantity q L ；
The blasting parameters comprise: blasting compaction stone filling unit consumption q 0 And calculating the converted sludge thickness H of the covered water depth mw Horizontal distance L for one-time propelling of blasting, silt-removing and stone-filling H And the volume weight gamma of the sludge determined according to the local underwater topography and the particle size of the bottom bed sludge m Water volume weight gamma w And the covered water depth H w ；
S3, designing the falling bottom width by combining the dyke core stones, and determining the length L of the single distribution of the explosive lines L Combined linear dose q L Calculating the dosage Q of single blasting silt removal and stone filling 1 And the amount of the individual packs q 1 ；
S4, according to the depth H of the covered water w Determining the buried depth H of the charge b Combined with the quantity q of the individual packs 1 Calculating the radius r of the bottom surface of a single blasting funnel and the volume V of the single blasting funnel i (ii) a Then combined with bottom bed sludge to stabilize dry volume weight gamma d Calculating the sludge amount m of the one-time blasting silt squeezing and stone filling blasting fly s ；
S5, calculating the velocity v of the uniform velocity section of the bulge according to the specific energy epsilon of a single explosive bag;
simulating a trajectory in the throwing process of the sludge particles, and calculating the maximum flying distance L of the sludge particles;
then the width L of the dyke body and the dyke head for distributing the chemical is combined ds 、L dt Calculating the receiving water body area S of the exploding flying silt;
then calculating the volume V of the receiving water body according to the average water depth H in the range of the receiving water body of the exploding flying silt w ；
S6, determining the sludge amount m of the blasting flying of the one-time blasting compaction filling stone according to the step S4 s And S5, determining the volume V of the receiving water body w Calculating the sudden increase concentration S of suspended sand in the sea area after the whole exploded flying sludge enters the receiving water body all ，
And then calculating the final suspended sand concentration increment A caused by blasting and silt squeezing according to the suspension ratio alpha.
Calculating the linear drug amount in the step S2 according to the following formula:
q L ＝q 0 L H H mw (1)
wherein q is L Is the linear dose, i.e. the dose distributed per unit length of the cloth, q 0 The unit consumption of blasting, silt removal and stone filling is 0.6-1.0 kg/m 3 ；L H The horizontal distance for blasting, removing silt and filling stone for one-time propelling is 4.5-7 m; h mw Calculating the converted sludge thickness for the covering water depth; h m To replace sludge thickness; h w Covering the water depth; gamma ray m Is the volume weight of the sludge; gamma ray w Is the water volume weight.
The single blasting silt-removing and stone-filling dosage Q in the step S3 1 And the amount of the individual packs q 1 The calculation of (c) is as follows:
Q 1 ＝q L ·L L (3)
q 1 ＝Q 1 /N (4)
in the formula, Q 1 The dosage q of the rock filling for single blasting desilting L Is the dose of thread, L L For one-time distribution of the length of the dosage line, q 1 The dosage of a single medicine package is adopted; n is the number of the medicine bags.
Radius r of bottom surface of single blasting funnel and volume V of single blasting funnel in step S4 i The calculation of (c) is as follows:
sludge quantity m of one-shot blasting, silt squeezing, stone filling and blasting fly s The calculation of (c) is as follows:
in the formula, r is the radius of the bottom surface of the blasting funnel; h b Burying the medicine bag deeply; q. q.s 1 The dosage of a single medicine package is obtained; lambda is a coefficient, and the value is 2.5 during field blasting; v i Is the volume of the blasting funnel; m is a unit of s The sludge amount for blasting flying of the one-time blasting silt-squeezing stone filling; gamma ray d Stabilizing the dry volume weight of the sludge of the bottom bed; n is the number of the medicine bags.
The calculation of the velocity v of the constant velocity section of the bulge in the step S5 is as follows:
the maximum flight distance L of the sludge particle is calculated as follows:
calculating the area S of the receiving water body of the exploding flying sludge according to the following formula:
receiving water volume V w The calculation of (c) is as follows:
V w ＝SH (11)
wherein v is the speed of the constant velocity section of the bulge; k is coefficient, take 0.36; epsilon is the specific energy; l is ds 、L dt The width of the dyke body and the width of the dyke head for distributing the chemicals are respectively; l is the maximum flying distance of sludge particles; s is the receiving water area of the exploded flying sludge; h is the average water depth in the range of the water body for receiving the exploding flying silt; v w The volume of the water body for receiving the burst flying sludge.
The concentration S of suspended sand in sea area is suddenly increased after the whole burst flying sludge enters the receiving water body all The calculation of (c) is as follows:
calculating the final concentration increment A of the suspended sand caused by blasting and silt squeezing as follows:
A＝αS all (13)
in the formula, S all The concentration of suspended sand is suddenly increased due to the fact that the whole of the exploded flying sludge enters a water body; alpha is suspension ratio, and can be 10% according to bottom mud gradation; and A is the final suspended sand concentration increment caused by blasting and silt squeezing.
The invention has the advantages that:
according to the method for calculating the sudden increase of the sea area suspended sand in the initial stage caused by blasting compaction, provided by the invention, the sea area suspended sand sudden increase in the initial stage in blasting compaction rock-filling construction is directly calculated according to the blasting parameters, the blasting fly sludge amount and the blasting fly sludge receiving water body in the blasting compaction rock-filling construction, so that the problems that the sudden increase strength and range of the sea area suspended sand in the blasting compaction initial stage are difficult to monitor and cannot be accurately calculated are solved. Before blasting, the method can effectively evaluate the negative effect possibly caused to the ecological environment of the surrounding sea area due to overhigh concentration of suspended sand in the water body by combining the engineering scheme, can correct the corresponding engineering scheme, and has strong practicability and wide applicability.
Drawings
Figure 1 is a schematic representation of the position of a single blasting cartridge of the invention.
Fig. 2 is a schematic view of the water containment area of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
The method for directly calculating the increment of suspended matters in the peripheral sea area caused by blasting silt-squeezing and stone-filling construction utilizes blasting parameters in the blasting silt-squeezing and stone-filling construction to calculate the amount of the blasting fly sludge and the water body for accommodating the blasting fly sludge, and calculates the increment of a suspended sand step caused by blasting silt-squeezing by combining the composition of the bed surface sand.
The blasting parameters are parameters related to the process of determining the explosive charge amount according to the blasting silt squeezing amount in the blasting silt squeezing and stone filling construction, and the single explosive charge amount can be determined by utilizing the blasting parameters;
the blasting flying deposition amount is the amount of sludge discharged after blasting, and can be calculated by the radius of the bottom surface of the blasting funnel, the burial depth of the explosive charge, the volume of the blasting funnel and the stable dry volume weight of the sludge of the bottom bed;
the method comprises the following steps that (1) the water body containing the burst flying sludge is the water body volume in a sludge throwing covering surface which is constructed by blasting, silt squeezing and stone filling and has a primary propelling distance and is blasted and flown, and the water body volume is calculated according to the water body area containing the burst flying sludge and the average water depth in the range of the water body containing the burst flying sludge;
the suspended sand concentration increment is suspended matter increment formed by resuspension of bottom bed silt caused by blasting, silt squeezing and stone filling construction, and is calculated by the amount of the blasting fly silt, the receiving water body of the blasting fly silt and the gradation of the bottom sand suspendable silt.
The method specifically comprises the following steps:
a method for calculating sudden increase of suspended sand in sea area in initial stage caused by blasting and silt squeezing comprises the following steps:
step 1, determining unit consumption q of blasting silt-squeezing rock filling according to engineering design scheme of blasting silt-squeezing sea foundation treatment 0 Converted sludge thickness H for covering water depth mw Horizontal distance L for one-time propelling of blasting, silt-removing and stone-filling H Determining the volume weight gamma of the sludge according to the local underwater topography and the particle size of the bottom bed sludge m Water volume weight gamma w And the depth of the covered water H w Then, the linear drug quantity q is calculated according to the formulas (1) and (2) L 。
q L ＝q 0 L H H mw (1)
Wherein q is L Is the linear dose, i.e. the dose distributed per unit length of the cloth, q 0 The unit consumption of blasting, silt removal and stone filling is 0.6-1.0; l is H The horizontal distance for one-time propelling of blasting, silt removing and stone filling is 4.5-7; h mw Calculating the converted sludge thickness for the covering water depth; h m To replace sludge thickness; h w Covering the water depth; gamma ray m The unit weight of the sludge; gamma ray w Is the water volume weight.
Step 2, determining the length L of the single distribution line according to the engineering design scheme of treating the sea bed by blasting and silt squeezing and by combining the design bottom falling width of the dyke core stone L Combining the thread dosage q calculated in the step 1 L Calculating the single blasting silt-discharging and stone-filling dosage Q according to the formula (3) 1 . Considering the blasting construction of the dyke head and the dyke body (figure 1), limited by construction process and technology, arranging quantitative explosive charges around the periphery of the rockfill body at equal intervals near the dyke head and the dyke bodies on two sides in a single point source mode for blasting operation, determining the number of the explosive charges according to an engineering design scheme, and then determining the single explosive charge quantity q according to a formula (4) 1 。
Q 1 ＝q L ·L L (3)
q 1 ＝Q 1 /N (4)
In the formula, Q 1 The dosage q of the rock filling for single blasting desilting L Is the dose of thread, L L For a single distribution of the length of the medicated thread, q 1 The dosage of a single medicine package is obtained; n is the number of the medicine bags.
Step 3, according to the covered water depth H w Determining the buried depth H of the charge b And taking the value of the coefficient lambda in field blasting, and combining the single explosive package quantity q obtained by calculation in the step 2 1 Calculating the radius r of the bottom surface of the single blast funnel and the volume V of the single blast funnel according to the formulas (5) and (6) i . Then, calculating the stable dry volume weight gamma according to the particle size characteristics of the bottom bed sludge d Calculating the sludge amount m of the blasting flying of the one-time blasting silt-squeezing filling stone by using a formula (7) s 。
Wherein r is the radius of the bottom surface of the blasting funnel; h b The medicine bag is buried deeply; q. q.s 1 The dosage of a single medicine package is obtained; lambda is a coefficient, and the value is 2.5 during field blasting; v i Is the volume of the blasting funnel; m is s The sludge amount of the blasting flying of the one-time blasting sludge squeezing filling stone; gamma ray d Stabilizing the dry volume weight of the sludge of the bottom bed; n is the number of the medicine bags.
Step 4, calculating the velocity v of the uniform velocity section of the bulge by using a formula (8) according to the specific energy epsilon and the coefficient K of a single explosive charge, simulating a trajectory in the process of throwing sludge particles, calculating the maximum flying distance L of the sludge particles by using a formula (9), and then processing the embankment body and the embankment head in the engineering design scheme of the sea base by blasting and silt squeezingWidth L of cloth medicine ds 、L dt Calculating the receiving water body area S of the exploding flying silt by using the formula (10) and combining with the graph 2, and calculating the receiving water body volume V by using the formula (11) according to the average water depth H in the range of the exploding flying silt receiving water body w 。
V w ＝SH (11)
Wherein v is the speed of the constant velocity section of the bulge; k is coefficient, take 0.36; epsilon is the specific energy; l is ds 、L dt The width of the dyke body and the width of the dyke head for distributing the chemicals are respectively; l is the maximum flying distance of sludge particles; s is the receiving water area of the exploded flying sludge; h is the average water depth in the range of the water body for receiving the burst flying sludge; v w The water volume for receiving the explosion flying silt.
Step 5, determining the sludge amount m of the one-time blasting compaction filling stone blasting flying according to the step 3 s And 4, determining the volume V of the receiving water body w Calculating the sudden increase concentration S of suspended sand in sea area after the whole exploded flying sludge enters the receiving water body by using the formula (12) all Then, the final suspended sand concentration step increment A caused by blasting and silt squeezing is calculated by using the formula (13) according to the suspension ratio alpha.
A＝αS all (13)
In the formula, S all The suspended sand suddenly increases the concentration caused by the whole flying silt entering the water body; alpha is suspension ratio, and can be 10% according to bottom mud gradation; a is caused by blasting and sludge squeezingThe final suspended sand concentration of (1).
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalents or equivalent changes fall within the protection scope of the present invention.
Claims (6)
1. A method for calculating sudden increase of suspended sand in sea area in initial stage caused by blasting and silt squeezing is characterized by comprising the following steps:
s1, the engineering scheme of treating the sea foundation by blasting and silt squeezing comprises the steps of arranging quantitative explosive charges at equal intervals on the rockfill dyke head and the dyke bodies on the two sides in a single-point source mode to perform detonation operation;
s2, determining blasting parameters according to an engineering scheme, and calculating the linear explosive quantity q L ；
The blasting parameters include: blasting compaction stone filling unit consumption q 0 Converted sludge thickness H for covering water depth mw Horizontal distance L for one-time propelling of blasting, silt-removing and stone-filling H And the volume weight gamma of the sludge determined according to the local underwater topography and the particle size of the bottom bed sludge m Water volume weight gamma w And the covered water depth H w ；
S3, designing the falling bottom width by combining the dyke core stones, and determining the length L of the single distribution of the explosive lines L Combined linear dose q L Calculating the dosage Q of single blasting silt removal and stone filling 1 And the amount of the individual packs q 1 ；
S4, according to the covering water depth H w Determining the buried depth H of the cartridge bag b Combined with the quantity q of the individual packs 1 Calculating the radius r of the bottom surface of the single blasting funnel and the volume V of the single blasting funnel i (ii) a Then the sludge of the bottom bed is combined to stabilize the dry volume weight gamma d Calculating the sludge amount m of the one-time blasting silt squeezing and stone filling blasting fly s ；
S5, calculating the velocity v of the uniform velocity section of the bulge according to the specific energy epsilon of a single explosive bag;
simulating a trajectory in the throwing process of sludge particles, and calculating the maximum flying distance L of the sludge particles;
then the width L of the dyke body and the dyke head for distributing the chemical is combined ds 、L dt Calculating the receiving water body area S of the exploding flying silt;
and obtaining the volume V of the receiving water body according to the average water depth H in the range of the receiving water body of the explosion flying silt w ；
S6, determining the sludge amount m of the blasting flying of the one-time blasting compaction filling stone according to the step S4 s And S5, determining the volume V of the receiving water body w Calculating the sudden increase concentration S of suspended sand in the sea area after the whole exploded flying sludge enters the receiving water body all And then calculating the final suspended sand concentration increment A caused by blasting and silt squeezing according to the suspension ratio alpha.
2. The method for calculating sudden increase of suspended sand in sea area in initial stage caused by blasting compaction as claimed in claim 1, wherein the line dosage in step S2 is calculated as follows:
q L ＝q 0 L H H mw (1)
wherein q is L Is the linear dose, i.e. the dose distributed per unit length of the cloth, q 0 The unit consumption of blasting, silt removing and stone filling is 0.6-1.0 kg/m 3 ；L H The horizontal distance for one-time propelling of blasting, silt removing and stone filling is 4.5-7 m; h mw Calculating the converted sludge thickness for the covering water depth; h m To replace sludge thickness; h w Covering the water depth; gamma ray m The unit weight of the sludge; gamma ray w Is the water volume weight.
3. The method for calculating sudden sea area sand suspension increase in the initial stage caused by blasting silt squeezing according to claim 1, wherein the single blasting silt-discharging stone-filling dosage Q in step S3 1 And the amount of the individual packs q 1 The calculation of (c) is as follows:
Q 1 ＝q L ·L L (3)
q 1 ＝Q 1 /N (4)
in the formula, Q 1 The dosage q of the rock filling for single blasting desilting L Is the dose of thread, L L For a single distribution of the length of the medicated thread, q 1 The dosage of a single medicine package is adopted; n is the number of the medicine bags.
4. The method for calculating sudden increase of suspended sand in sea area in initial stage caused by blasting compaction as claimed in claim 1, wherein the radius r of bottom surface of single blasting funnel and the volume V of single blasting funnel in step S4 i The calculation of (c) is as follows:
sludge quantity m of one-shot blasting, silt squeezing, stone filling and blasting fly s The calculation of (c) is as follows:
in the formula, r is the radius of the bottom surface of the blasting funnel; h b Burying the medicine bag deeply; q. q.s 1 The dosage of a single medicine package is obtained; lambda is a coefficient, and the value is 2.5 during field blasting; v i Is the volume of the blasting funnel; m is a unit of s The sludge amount for blasting flying of the one-time blasting silt-squeezing stone filling; gamma ray d Stabilizing the dry volume weight of the sludge of the bottom bed; n is the number of the medicine bags.
5. The method for calculating sudden increase of suspended sand in sea area in initial stage caused by blasting compaction as claimed in claim 1, wherein the calculation of the velocity v of the uniform velocity section of the bulge in step S5 is as follows:
the maximum flight distance L of the sludge particle is calculated as follows:
calculating the area S of the receiving water body of the blasting flying sludge according to the following formula:
receiving water volume V w The calculation of (c) is as follows:
V w ＝SH (11)
wherein v is the speed of the uniform velocity section of the bulge; k is a coefficient, and 0.36 is taken; epsilon is the specific energy; l is a radical of an alcohol ds 、L dt The width of the dyke body and the width of the dyke head for distributing the chemicals are respectively; l is the maximum flying distance of sludge particles; s is the receiving water area of the exploded flying sludge; h is the average water depth in the range of the water body for receiving the exploding flying silt; v w The water volume for receiving the explosion flying silt.
6. The method for calculating sudden sea area sand increase in the initial stage caused by blasting compaction according to claim 1, wherein the sudden sea area sand increase concentration S after the whole blasted fly sludge enters the receiving water body all The calculation of (c) is as follows:
calculating the final concentration increment A of the suspended sand caused by blasting and silt squeezing as follows:
A＝αS all (13)
in the formula, S all The concentration of suspended sand is suddenly increased due to the fact that the whole of the exploded flying sludge enters a water body; alpha is suspension ratio, and can be selected according to bottom mud gradation10 percent; and A is the final suspended sand concentration increment caused by blasting and silt squeezing.
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