CN110823027B - Flood-control blasting opening structure of dike and setting method thereof - Google Patents
Flood-control blasting opening structure of dike and setting method thereof Download PDFInfo
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- CN110823027B CN110823027B CN201910965661.0A CN201910965661A CN110823027B CN 110823027 B CN110823027 B CN 110823027B CN 201910965661 A CN201910965661 A CN 201910965661A CN 110823027 B CN110823027 B CN 110823027B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
The invention relates to the design technology of a dyke flood diversion port door, in particular to a flood control blasting opening digging structure of a dyke and a setting method thereof, wherein the flood control blasting opening digging structure comprises a dyke with a longitudinal section approximately in an isosceles trapezoid shape, a plurality of blasting sections are arranged on the dyke, drilling holes are arranged in rows on the water facing surface, the dyke top and the water backing surface of the blasting sections along the trend of the dyke, the drilling holes are positioned on the water facing surface and the dyke top and are both vertically and downwards arranged, the axes of the drilling holes positioned on the water backing surface and the dyke bottom of the blasting sections form a certain inclination angle and are inclined from the water backing surface to the water facing surface; the drilling hole is internally provided with a pre-buried charging device, the inner sides of two ends of the blasting section are provided with deep mixing piles, and a hydraulic scouring section is arranged between the deep mixing piles and the blasting section. The method has the advantages of low cost, timely flood diversion and loss prevention, small disturbance to the dike, convenience in implementation and the like, is convenient for managers to guide flood control and emergency rescue work, and is also beneficial for engineering technicians to carry out excellent design on the dike blasting opening.
Description
Technical Field
The invention relates to a design technology of a dyke flood diversion port door, in particular to a flood control blasting opening structure of a dyke and a setting method thereof.
Background
A flood diversion port door of an embankment is an engineering structure for diversion of embankments when an over-standard flood comes. The flood diversion gate is widely applied to dam and dike projects at the upstream of the stagnant flood storage area, and particularly applied to dam and dike projects at the upstream of the high-capacity stagnant flood storage area, such as Yanghu Kangshan stagnant flood storage area, Jingjiang flood diversion projects and the like. The design of the flood diversion gate is related to success or failure of starting of a flood storage and stagnation area and exertion of a flood control and loss prevention function of a dam embankment, the flood diversion gate is mainly selected according to design schemes from the aspects of starting flexibility, flood diversion reliability, engineering investment, operation management and the like, and the form of the flood diversion gate is mainly three, namely natural flood diversion, flood diversion gate flood diversion and flood diversion through a spillway. The method aims at starting the flood diversion gate by adopting a blasting opening method, especially ensures the starting flexibility and reliability, and is of great importance in effectively controlling the opening size and the development trend in the flood diversion process.
The centralized charging blasting of solid explosives is the most common mode for blasting dykes flood diversion and raking off at present, and the operation steps comprise digging a explosive chamber, charging, wiring and detonating, and the detonation is not necessary after the charging, which has more defects. Except that flood diversion of few important dikes may reserve a medicine chamber, the medicine chamber is temporarily excavated by manpower for most dikes. Because the early warning forecast time of breaking a dike is short, the operation environment is severe, whether the breaking a dike is influenced by factors such as weather, flood peak and flood volume, two main technical defects exist in the temporary excavation of the explosive chamber: firstly, the temporary excavation operation speed is slow, so that the timely breakwater is influenced; secondly, the volume of the centralized medicine charging chamber is larger, and the intensity of the dike is easy to reduce. In addition, when flood reaches a certain water level line or meets an emergency flood diversion task, the flood diversion port door needs to be blasted to form a digging opening for flood diversion, and the size of the digging opening cannot be determined due to the influence of factors such as flood grade, evacuation conditions of personnel and materials in a downstream or stagnant flood storage area, required flood diversion amount, flood storage amount in the stagnant flood storage area and the like on the size of the blasting digging opening and the time point of blasting, so that the problems that the personnel and the materials are not evacuated timely, the flood diversion task does not reach the standard and the like can be caused.
Disclosure of Invention
The invention aims to overcome the defects of low operation speed of temporarily excavating a powder chamber and reduction of the intensity of an embankment in the prior art, provides a flood control blasting opening structure of the embankment, and simultaneously discloses a method for arranging a blasting flood diversion opening door by adopting the structure, which can accurately grasp the size of the blasting opening, timely finish the evacuation work of population and materials and effectively ensure the flood diversion task.
The invention is realized by the following scheme:
the flood control blasting opening structure comprises an embankment with a longitudinal section approximately in an isosceles trapezoid shape, wherein a plurality of blasting sections are arranged on the embankment, drilling holes are formed in a row on the waterside surface, the top of the embankment and the waterside surface of each blasting section along the trend of the embankment, the drilling holes are vertically and downwards arranged on the waterside surface and the top of the embankment, the axes of the drilling holes on the waterside surface and the bottom of the embankment of each blasting section form a certain inclination angle and are obliquely arranged, and the drilling holes are oblique from the waterside surface to the waterside surface; the drilling hole is internally provided with a pre-buried charging device, the inner sides of two ends of the blasting section are provided with deep mixing piles, and a hydraulic scouring section is arranged between the deep mixing piles and the blasting section.
The embedded explosive charging device comprises an explosive charging pipeline for placing explosives, one end of the explosive charging pipeline is a closed end, the other end of the explosive charging pipeline is an open end, a sealing cover for packaging the explosives is sleeved outside the open end, and a closed chamber is formed at the other end of the explosive charging pipeline and used for charging the explosives.
The pipeline sealing cover is preferably a flat opening cover, the end opening of the medicine charging pipeline is preferably a flat opening end matched with the pipeline sealing cover, and the pipeline sealing cover seals the end of the medicine charging pipeline in a direct sleeving manner.
The preferred plastics PVC material of powder charge pipeline, the diameter is 30 ~ 150mm, pipeline seal closure rubber material, its diameter ratio is 4 ~ 6mm bigger than the powder charge pipeline. The thickness and the hardness of the powder charging pipeline are based on a PVC pipe commonly used in engineering, the length of the powder charging pipeline is selected according to the blasting design, and the length of the powder charging pipeline is generally 3-50 m.
The pre-buried charging device is pre-buried in an embankment according to a hole-blasting blast hole arrangement scheme designed for portal blasting, and blasting flood diversion is performed when a flood diversion task is met. The charging pipe is used as a charging chamber during the blasting process. The pipeline sealing cover has the functions of preventing water and other impurities from entering the closed pipeline during normal operation of the dike and preventing the explosive from being affected with damp and losing efficacy during the process of blasting and breaking the dike.
And a rock piling mark is arranged at a drilling inlet of the embedded powder charging pipeline, and a waterproof structure is arranged at the contact position of the rock piling mark and the powder charging pipeline.
The setting method suitable for the blasting breaking and opening comprises a flood diversion method capable of controlling the size of the opening, the size of the opening is determined according to the flood grade and the flood diversion emergency degree, blasting sections are continuously set, deep mixing piles are used for separating the blasting sections, hydraulic flushing sections are also set, a flood diversion opening door is blasted according to a corresponding flood diversion task, the size of the opening is effectively controlled, and evacuation of population and materials is facilitated.
A method for setting a flood-control blasting opening structure of an embankment comprises the following steps:
s1, establishing a flood evolution model of flood diversion by using blasting and raking openings for dikes:
and establishing a flood evolution model by using flood simulation software such as MIKE21 and CCHE according to data such as terrain elevation, water depth and upstream flow, and analyzing changes of water level, flow and submerging range in the flood evolution process by using blasting rakes with different values of parameters.
S2, flow process in the flood evolution process is statistically analyzed:
through flood evolution process, the flow change in the flood evolution process is counted in real time, the submerged water depth and the submerged range change, and then whether the size of the entrance meets the evacuation requirement of flood discharge and good personnel and materials is analyzed.
S3 optimizing flood gate parameters:
optimizing and analyzing blasting opening design parameters according to the embankment stability requirement and the technical economy optimal principle specified by related blasting embankment design specifications, and providing parameter values such as the width and the depth of a blasting opening, the position of the blasting opening, the number of blasting sections and the like which meet flood diversion loss stop;
firstly, the flood diversion flow is calculated according to the capacity determined in the flood diversion task or the capacity of the stagnant flood storage area and the flood diversion time:
in the formula: qbIs the discharge flow (m) of the breach3S); v is the capacity of the flood storage area or the capacity (m) needing flood diversion3) (ii) a t is the flood diversion duration.
Hold stagnant flood zone flood diversion exit door and have three kinds of flood diversion modes such as natural flood diversion, gate flood diversion and blasting flood diversion, all reserve and have a flood diversion exit, when the lake outlet water level reaches the flood diversion water level, take the breach of relevant engineering measure with the dyke reservation and take off, hold stagnant flood zone and begin to advance floodwaters, refer to the parameter that flood diversion exit door set up, adopt the wide top weir formula to reversely push away the width of taking a place:
in the formula: m is a flow coefficient; δ is the inundation coefficient; qbIs the discharge flow (m) of the breach3S); z is the river water level (m) at the break; zbIs the elevation (m) of the top of the breach; b is the width (m) of the breach.
The calculation of the calculated opening width is rewritten by the formula (1):
s4, setting the drilling quantity, depth and arrangement mode of the blasting section:
optimizing and analyzing blasting drilling design parameters according to the embankment stability requirement and the optimal technical and economic principle specified by the relevant blasting embankment design specifications, and providing parameter values such as drilling row spacing, hole spacing, depth, arrangement mode and the like which meet the requirements of blasting the raking opening; after the drilling parameters are determined, drilling is completed in the normal operation stage of the dike, the explosive charging device is pre-embedded, when a flood diversion task is performed, a set of detonating cord detonating line and two sets of electric detonating lines are adopted, wherein the detonating sequence is that the middle section is performed first and then the two side sections are performed, and the back water side is performed first and then the front water side is performed.
S5, pre-buried device parameters are formulated:
and (4) according to the actual situation of the dike and the relevant design specifications, setting parameters such as the length, the diameter, the burial depth, the arrangement mode and the like of the pre-buried device.
Advantageous effects
The invention has the beneficial effects that:
the invention is characterized in that a method for setting the explosion opening of the explodable dike is provided, the defects that the temporary excavation of a powder chamber is slow in operation speed and the intensity of the dike is reduced are overcome by adopting a pre-buried charging device, the size of the explosion opening is accurately controlled by adopting a continuously-arranged explosion section, and the evacuation work of people and the flood diversion task are timely completed.
Drawings
FIG. 1 is a process diagram of flood inlet flow at flood diversion gate in Kangshan stagnant flood storage area;
FIG. 2 is a plan view of a common centralized charging blasting embankment;
FIG. 3 is a cross section of a common centralized charging blasting breakwater;
FIG. 4 is a plan view of a continuous blasting section breakwater arranged by using an embedded charging device;
FIG. 5 is a cross section of blasting breakwater by using a pre-embedded charging device;
FIG. 6 is a schematic diagram of an embedded charging device;
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings.
The invention discloses a flood control blasting opening structure of an embankment, which comprises an embankment 7 with a longitudinal section approximately in an isosceles trapezoid shape, wherein a plurality of blasting sections 1 are arranged on the embankment 7, drilling holes 2 are arranged in rows on a water facing surface 101, an embankment top 102 and a water backing surface 103 of each blasting section 1 along the trend of the embankment 7, the drilling holes 2 are positioned on the water facing surface 101 and the embankment top 102 and are vertically and downwards arranged, the axial lines of the drilling holes 2 positioned on the water backing surface 103 and an embankment bottom 104 of each blasting section 1 form a certain inclination angle and are obliquely arranged, and the drilling holes are inclined from the water backing surface 103 to the water facing surface 101; the method is characterized in that a pre-buried charging device 3 is arranged in the drill hole 2, deep mixing piles 5 are arranged on the inner sides of two ends of the blasting section 1, a hydraulic flushing section 6 is arranged between the deep mixing piles 5 and the blasting section 1, and the method for continuously setting the blasting section 1 is used for realizing graded and ordered flood diversion; the axis of drilling 2 through the surface of a water face 103 forms certain inclination slope setting with the dyke end 104 of blasting section 1 and can enlarge the explosion range when reducing drilling 2 quantity, and the main bottom reduces disturbance dyke original structure, can ensure again can in time blast flood diversion, and when the slope setting simultaneously, can not need drilling 2 of face 101 to realize the blasting occasionally.
The embedded explosive loading device 3 comprises an explosive loading pipeline 301 for placing explosives, one end of the explosive loading pipeline 301 is a closed end, the other end of the explosive loading pipeline 301 is an open end, a sealing cover 302 for packaging the explosives is sleeved outside the open end, a closed chamber is formed at the other end of the explosive loading pipeline and used for loading the explosives, the sealing cover 302 is used for preventing water and other impurities from entering the closed pipeline when the dike normally operates, and the explosives can be prevented from being damped and losing efficacy in the process of blasting and breaking the dike.
The sealing cover 302 is a flat cover, the open end of the charging pipeline 301 is a flat end matched with the open end, and the open end of the charging pipeline 301 is sealed by the sealing cover 302 of the pipeline in a direct sleeving manner.
The stone-stacking mark 4 is arranged at the entrance of the drill hole 2 after the explosive-charging pipeline 301 is buried, and a waterproof structure is arranged at the contact position of the explosive-charging pipeline 301, so that the worker can know the explosive-charging condition more obviously.
A method for setting a flood-control blasting opening structure of an embankment comprises the following steps:
(1) establishing a flood routing model for flood diversion of an embankment by using blasting raking openings:
firstly, a flood evolution model using blasting opening flood diversion is required to be established, parameters such as opening size, position depth and the like are preliminarily determined, according to the data of terrain elevation, water level, upstream flow, structures of the impounded flood area and the like, flood simulation software such as MIKE21, CCHE and the like is utilized to establish a flood evolution model, and the changes of water level, flow and submerging range in the flood evolution process are analyzed by utilizing the blasting opening with different parameters, whether the preliminarily designed opening size can achieve the flood diversion task and complete the safe evacuation of personnel and materials is analyzed, so as to preliminarily set the opening size, and selecting the optimal flood diversion mode of gate flood diversion, natural flood diversion and blasting flood diversion, and setting the opening according to the downstream economic and social environment and other conditions, the device avoids unnecessary economic and social environmental losses, is generally arranged at the bank section which is firstly submerged, and can reduce the damage of the bank section.
(2) The flood inlet flow process in the flood routing process is counted and analyzed:
the method is characterized in that the size of a scrabbling opening can be controlled by adopting the setting method, the blasting engineering amount and the recovery workload after flood diversion are reduced to a great extent, and unnecessary economic and social environmental losses can be reduced.
(3) Optimizing flood diversion gate parameters:
and (3) carrying out optimization analysis on blasting opening design parameters according to the stability requirement of the dike and the optimal technical economy principle specified by the design specification of the related explodable dike, and providing parameter values such as the width and the depth of the blasting opening, the position of the blasting opening, the number of blasting sections and the like which meet flood diversion loss stop.
(4) Drawing up the drilling quantity, depth and arrangement mode of the blasting section:
according to the embankment stability requirement specified by the relevant blasting embankment design specification and the technical economy optimal principle, the blasting drilling design parameters are optimized and analyzed, and the values of the parameters such as the number of drilling holes, the row spacing, the hole spacing, the depth, the arrangement mode and the like which meet the requirements of blasting the opening are provided. After the drilling parameters are determined, drilling is completed in the normal operation stage of the dike, the explosive charging device is pre-embedded, when a flood diversion task is performed, a set of detonating cord detonating line and two sets of electric detonating lines are adopted, wherein the detonating sequence is that the middle section is performed first and then the two side sections are performed, and the back water side is performed first and then the front water side is performed.
(5) Drawing parameters of the pre-buried device:
and (4) according to the actual situation of the dike and the relevant design specifications, setting parameters such as the length, the diameter, the burial depth, the arrangement mode and the like of the pre-buried device.
The specific implementation example of the invention is as follows:
1. the method is implemented by taking the Kangshan embankment as an example, and the superiority of the method for setting the blasting pushing opening is shown by comparison, wherein the Kangshan flood storage area comprises a flood storage closed ring consisting of the Kangshan embankment and an interrupted dike constructed along the mountain hillock land, and a flood diversion opening is reserved. The flood diversion port is positioned at the pile number of 20+ 070-20 +450 of the Kangshan levee, the width of the flood diversion port is 380m, and deep cement mixing pile lattice wall wrapping heads are arranged on two sides of the flood diversion port for protection. According to the 'notice about the Yangtze river flood scheduling scheme of the State flood control and drought resistance general command' (Guassian Signal No. [1999] 10), when the Poyang lake water level reaches 20.59m (Wurime elevation 22.50m), the Poyang lake water level of the corresponding Kangshan station reaches 20.68m (Wurime elevation 22.55m), flood feeding is started in a flood storage area, flood distribution is carried out in the Kangshan flood storage area by adopting an artificial blasting mode, the final bottom width is 12.5m after blasting, and the process of Kongshan blasting and flushing expansion is carried out according to 2 hours. Referring to the feasibility study report of the safety construction engineering of Poyang lake impoundment stagnant flood area in Jiangxi province, the height of the entrance door bottom is 15.93m (yellow sea height).
The original design considers the combined action of blasting and hydraulic impact at the flood diversion port, and takes the hydraulic impact as the main part and the blasting as the auxiliary part; in the design, flood diversion gates are divided into three categories for processing: blasting a middle 298 m-wide arrangement chamber; the 74m holes in the central section are encrypted, the loading amount is increased, and the section can be smoothly fried during flood diversion; the two sides are respectively 20.5m, so that water flow can be naturally rushed; the plan view and the cross-sectional view of the original design are shown in fig. 2 and 3, respectively, wherein the blasting cells are classified into A, B, C and D, see fig. 3.
2. According to the invention, the blasting flood diversion gate is arranged as follows:
(1) establishing a flood routing model for flood diversion of an embankment by using blasting raking openings:
and (3) establishing a flood evolution model by using flood simulation software such as MIKE21 and CCHE according to data such as terrain elevation, water level, upstream flow and structures of a stagnant flood area, wherein the width of the gate is 380m and the bottom elevation of the gate is 15.93m when the flood gate of the Kangshan embankment divides floodwater. Before flood diversion, the flood storage bottom water level in the Kangshan flood storage area is 15.10m, and the waterlogging submerging range is about 69km2(area of removed water area), the whole flood diversion process of the entrance takes 48 hours, and the total flood inflow amount is 16.58 hundred million m3Total submerged area 288km2。
(2) The flow process in the flood evolution process is counted and analyzed:
when the water level at the lake outlet of Yanghu reaches 20.59m (Wurime elevation 22.5m) high flood level, the water level after recovery at Kangshan station is 20.68m (yellow sea elevation), and Kangshan embankment begins to flood through the blast hole gate. The portal development process is determined according to the initial portal form and the final portal form and the time required for the portal development to stop reaching the final portal form, wherein the final portal size and the portal development time are reasonably determined by combining actual burst survey data which have already occurred in a local area or the like. And (3) calculating the development process of the entrance without considering the interval rainfall, and obtaining a flood diversion flow change process curve as shown in figure 1. When the flood bank is burst, the flood diversion flow reaches the maximum value of 14000m within 2 hours3And s. After 24 hours, the flood diversion flow rate begins to drop to 48 hours, the whole flood inlet process is completed, the water level in the flood storage area reaches 20.68m (yellow sea elevation) and is consistent with the water level of an external lake, at the moment, the flood diversion flow rate is 0, and the entrance does not enter any more.
(3) Optimizing flood diversion gate parameters:
as can be seen from the above items (1) and (2), the stagnant flood area was flooded for 48 hours, and the flow rate was drastically increased to 14000m in 2 hours3And/s, continuing for 22 hours, stopping the entrance after 48 hours, and controlling the size of the entrance in order to prevent untimely evacuation of personnel and materials caused by emergency. The concrete measures are as follows: the flood diversion port is arranged at the position of a pile number of 20+ 070-20 +450 of a Kangshan levee, the width of the flood diversion port is 380m, and deep cement mixing pile lattice wall wrapping heads are arranged on two sides of the flood diversion port for protection. According to the general directive of State flood control and drought resistance Notification about the flood scheduling scheme of Yangtze river (Guo Xuan (1999))]No. 10), when the water level at the lake outlet reaches 20.59m (Wurime elevation 22.50m), the Poyang lake level of the corresponding Kangshan station reaches 20.68m (Wurime elevation 22.55m), flood storage areas start flood entry, improvement is carried out on the basis of the original design, two sections of continuous blasting sections are adopted for blasting flood diversion in two times, and the middle is separated by a 20m wide deep mixing pile; the flood diversion gate is divided into three categories to be treated in the design: blasting 139m wide in the middle of each section; the central section of the medicine bottle is provided with 30m encrypted holes for filling medicineThe volume is increased, and the section can be smoothly fried during flood diversion; the two sides are 20.5m respectively, so that the water flow can be naturally rushed, and a plane layout diagram is shown in figure 4.
(4) Drawing up the drilling quantity, depth and arrangement mode of the blasting section:
because the original design adopts a common method of a centralized blasting port door, the time for forecasting the broken dyke is short, the operating environment is severe, the broken dyke is influenced by factors such as weather, flood and the like, the volume of the centralized loading chamber is large, and the intensity of the dyke is easy to reduce. The invention provides an embedded explosive charging device for blasting to better avoid the problems, drilling is completed according to the specification of the embedded explosive charging device under the normal operation condition of the dike, explosive charging blasting is carried out when a flood diversion task is carried out, a set of detonating cord detonating line and two sets of electric detonating lines are used, the detonating sequence is that the middle is firstly carried out and then the two side sections are carried out, the back water side is firstly carried out and then the front water side is carried out, a flood diversion gate consists of a hydraulic power punching section and a blasting section, deep mixing pile retaining walls are arranged at the two ends of the flood diversion gate, the blasting section adopts cavern blasting, during the construction or normal operation stage of the dike, drilling is carried out according to the design requirement of flood diversion and breakwater, holes are vertically distributed on the front water surface and the dike top, the holes are obliquely distributed on the back water surface (the inclination angle is 10-40 degrees), the row spacing and the hole spacing are 2-4 m, the vertical distance between the inlet of a first row drilling hole and the dike top is 1-3 m, the embedded explosive charging device with the two sealed ends is embedded into the drilling hole, the upper end port of the pipeline is embedded into the dike by 20-80 cm, and the concrete arrangement is shown in figures 4 and 5.
(5) Drawing parameters of the pre-buried device:
the powder charging pipeline is made of plastic PVC (polyvinyl chloride) materials, the diameter of the powder charging pipeline is 30-150 mm, the pipeline sealing cover is made of rubber materials, and the diameter of the pipeline sealing cover is 4-6 mm larger than that of the powder charging pipeline. The thickness and the hardness of the powder charging pipeline are based on PVC pipes commonly used in engineering, the length of the powder charging pipeline is selected according to blasting design, and is generally 3-50 m, as shown in figure 6.
Although the invention has been described and illustrated in some detail, it should be understood that various modifications may be made to the described embodiments or equivalents may be substituted, as will be apparent to those skilled in the art, without departing from the spirit of the invention.
Claims (3)
1. A flood control blasting opening structure of an embankment comprises an embankment (7) with a longitudinal section approximately in an isosceles trapezoid shape, and is characterized in that: the embankment (7) is provided with a plurality of blasting sections (1), drilling holes (2) are arranged on the water facing surface (101), the embankment top (102) and the water backing surface (103) of each blasting section (1) in rows along the trend of the embankment (7), the drilling holes (2) are positioned on the water facing surface (101) and the embankment top (102) and are vertically and downwards arranged, the axes of the drilling holes (2) positioned on the water backing surface (103) and the embankment bottom of each blasting section (1) form a certain inclination angle and are obliquely arranged, and the drilling holes are obliquely inclined from the water backing surface (103) to the water facing surface (101); a pre-buried charging device (3) is arranged in the drilling hole (2), deep mixing piles (5) are arranged on the inner sides of two ends of the blasting section (1), and a hydraulic flushing section (6) is arranged between each deep mixing pile (5) and the blasting section (1); the embedded explosive loading device (3) comprises an explosive loading pipeline (301) for placing explosives, one end of the explosive loading pipeline (301) is a closed end, the other end of the explosive loading pipeline is an open end, and a sealing cover (302) for packaging the explosives is sleeved outside the open end; and after the powder charging pipeline (301) is buried, a rock stacking mark (4) is arranged at the entrance of the drilling hole (2), and a waterproof structure is arranged at the contact position of the powder charging pipeline (301).
2. A flood protection bursting access structure for a bank as claimed in claim 1, wherein: the sealing cover (302) is a flat cover, and the open end of the charging pipeline (301) is a flat end matched with the charging pipeline.
3. A method for setting a flood control blasting opening structure of an embankment is characterized by comprising the following steps:
s1, establishing a flood routing model for flood diversion of an explosion opening used by a dike:
establishing a flood routing model during flood diversion in a stagnant flood storage area, preliminarily determining the position parameters of a raking opening, establishing a flood routing model by using MIKE21 and CCHE flood simulation software according to terrain elevation, water level, upstream flow and building materials of the stagnant flood storage area, and analyzing the changes of the water level, the flow and a submerging range in the flood routing process by using blasting raking openings with different parameters;
s2, carrying out statistical analysis on the flood inflow flow in the flood evolution process:
analyzing the flow process in real time according to a flood evolution model established by MIKE21 and CCHE flood simulation software, and determining the number of blasting sections in blasting flood diversion according to the loss severity level, risk level and flood diversion task condition;
s3, optimizing flood diversion gate parameters:
optimizing and analyzing blasting opening design parameters according to the embankment stability requirement and the technical economy optimal principle specified by the relevant blasting embankment design specifications, and providing parameters such as the width and the depth of a blasting opening, the position of the blasting opening and the quantity of blasting sections which meet flood diversion and loss stopping;
firstly, the flood diversion flow is calculated according to the capacity determined in the flood diversion task or the capacity of the stagnant flood storage area and the flood diversion time:
in the formula: qb is the discharge flow (m) at the breach3S); v is the capacity of the flood storage area or the capacity (m) needing flood diversion3) (ii) a t is flood diversion duration;
hold stagnant flood zone flood diversion exit door and have the three kinds of flood diversion modes of natural flood diversion, gate flood diversion and blasting flood diversion, all reserve and have the flood diversion exit, when the lake outlet water level reaches the flood diversion water level, take the breach of relevant engineering measure with the dyke reservation and take off, hold stagnant flood zone and begin to advance floodwaters, refer to the parameter that flood diversion exit door set up, adopt wide top weir formula to reversely push away the width of taking off:
in the formula: m is a flow coefficient; δ is the inundation coefficient; qb is the discharge flow (m) at the breach3S); z is the river water level (m) at the break; zb is the elevation (m) of the top of the breach; b is the width (m) of the breach;
the calculation of the calculated opening width is rewritten by the formula (1):
s4, drawing up the number, depth and arrangement mode of the drilling holes of the blasting section:
according to the embankment stability requirement and the technical economy optimal principle specified by the design specification of the related explodable embankment, the explosion drilling hole design parameters are optimized and analyzed, the drilling hole number, the row spacing, the hole spacing, the depth and the arrangement mode parameter values meeting the requirements of the explosion of the raking opening are provided, after the drilling hole parameters are determined, the drilling is completed in the normal operation stage of the embankment, a charging device is pre-embedded, when a flood diversion task is carried out, a set of detonating cord detonating line and two sets of electric detonating lines are adopted, the detonating sequence is that the middle section is firstly carried out and then the two side sections are carried out, and the back water side is firstly carried out and then the water side is carried out;
s5, drawing parameters of the pre-buried device:
and (4) setting up the length, diameter, burial depth and arrangement mode parameters of the pre-buried device according to the actual situation of the dike and relevant design specifications.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910965661.0A CN110823027B (en) | 2019-10-12 | 2019-10-12 | Flood-control blasting opening structure of dike and setting method thereof |
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| CN201910965661.0A CN110823027B (en) | 2019-10-12 | 2019-10-12 | Flood-control blasting opening structure of dike and setting method thereof |
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| CN110823027A CN110823027A (en) | 2020-02-21 |
| CN110823027B true CN110823027B (en) | 2022-03-22 |
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| CN114061390A (en) * | 2020-07-30 | 2022-02-18 | 神华神东煤炭集团有限责任公司 | Blasting demolition method for artificial dam body |
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