CN109815574B - Method and device for determining flood condition of overtopping dam break of tailing pond - Google Patents
Method and device for determining flood condition of overtopping dam break of tailing pond Download PDFInfo
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Abstract
The disclosure relates to a method and a device for determining flood conditions of overtopping dam break of a tailing pond, wherein the method comprises the steps of determining a flood storage process curve according to a current flood standard and a flood discharge process line; calculating the highest flood level according to the flood storage process curve and the flood regulation reservoir capacity curve; comparing the height of the highest flood level with the height of the top of the tailing dam; and when the highest flood level is higher than the top of the tailing dam, determining that the current flood standard is a flood condition of overtopping and dam break of the tailing pond. The problem of inaccurate simulation result because the flood condition is not consistent with the actual flood condition during simulation is solved.
Description
Technical Field
The disclosure relates to the technical field of tailing ponds, in particular to a method and a device for determining flood conditions of overtopping dam break of a tailing pond.
Background
The tailing pond is a place which is formed by building a dam to intercept a valley opening or enclosing the ground and is used for piling metal or nonmetal mines and discharging tailings or other industrial waste residues after ore sorting. The tailings pond is an artificial debris flow danger source with high potential energy, dam break danger exists, and major accidents are easily caused once the tailings pond is lost.
In order to ensure the safety of the tailings pond, a overtopping dam break model test and a numerical simulation of the tailings pond are generally carried out, and flood conditions need to be determined in the test. At present, water is mainly injected into a overtopping dam-break model of a tailing pond until overtopping dam-break occurs, and then water injection is stopped, so that the overtopping dam-break model serves as a flood condition.
Direct water injection and actual flood conditions are not consistent, and static conditions are adopted, so that the influence conditions of the flood process and dam break on the downstream in the dam break process in the numerical simulation are inaccurate, and accurate basis cannot be provided for writing emergency plans and implementing disaster relief.
It is noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure and therefore may include information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a method and a device for determining flood conditions of overtopping dam break of a tailing pond, and further solve the problem that simulation results are inaccurate due to the fact that the flood conditions are not consistent with actual flood conditions in simulation in the related technology at least to a certain extent.
According to an aspect of the disclosure, a method for determining flood conditions of overtopping and dam break of a tailing pond is provided, which includes:
determining a flood storage process curve according to the current flood standard and the flood discharge process line;
calculating the highest flood level according to the flood storage process curve and the flood regulation storage capacity curve;
comparing the height of the highest flood level with the height of the top of the tailing dam;
and when the highest flood level is higher than the top of the tailing dam, determining that the current flood standard is a flood condition of overtopping and dam break of the tailing pond.
According to an embodiment of the disclosure, the method for determining the flood condition of overtopping and dam break of the tailing pond further includes:
and when the highest flood level is lower than the top of the tailing dam, updating the current flood standard until the highest flood level is higher than the top of the tailing dam, and determining that the current flood standard is a flood condition of overtopping and dam break of the tailing pond.
According to an embodiment of the disclosure, the method for determining the flood condition of overtopping dam break of the tailing pond further comprises the following steps:
and comparing the flood condition of the overtopping dam break of the tailing pond with the historical maximum flood, and determining that the historical maximum flood is the flood condition of the overtopping dam break of the tailing pond when the historical maximum flood is larger than the flood condition of the overtopping dam break of the tailing pond.
According to an embodiment of the present disclosure, determining a flood storage process curve according to the current flood standard and the flood discharge process line includes:
calculating to obtain a flood process curve according to the current flood standard;
and obtaining a flood storage process curve according to the flood process curve and the flood discharge process line.
According to an embodiment of the present disclosure, calculating a flood process curve according to a current flood standard includes:
calculating to obtain a flood process curve according to a current flood standard through a first formula, wherein the first formula is as follows:
wherein Qp is the peak flow rate of the flood with frequency P, sp is the rainstorm force with frequency P, F is the catchment area of the reservoir area, m is the confluence parameter, L is the length of the main ditch of the reservoir area, j is the average slope drop in the ditch, mu is the average infiltration rate of the residual duration, and A, B, C and D are the maximum peak flow rate calculation indexes.
According to an embodiment of the present disclosure, the rainstorm force Sp with the frequency P is calculated by a second formula:
wherein H 24p Is the 24 hour rainfall at frequency P, n 2 Is a second rainstorm decreasing index.
According to an embodiment of the present disclosure, the rainfall in 24 hours when the frequency is P is H 24P Calculated by a third formula:
H 24P ＝K P H 24
wherein, K P Is the modulus coefficient, H 24 Is decreased within 24 hours at maximum for every yearAverage rainfall.
According to an embodiment of the present disclosure, further comprising:
determining the maximum peak flow calculation indexes A, B, C and D, including:
and selecting the maximum peak flow calculation indexes A, B, C and D according to the rainstorm decreasing index.
According to an embodiment of the present disclosure, the calculating a highest flood level according to the flood storage process curve and the flood diversion reservoir capacity curve includes:
acquiring a flood regulation storage capacity according to the flood regulation storage capacity curve;
calculating the total flood amount according to the flood storage process curve;
and calculating the highest flood level according to the total flood amount and the flood regulation storage capacity.
According to another aspect of the present disclosure, there is provided a flood condition determining apparatus for overtopping and dam break of a tailings pond, including:
the first determining module is used for determining a flood storage process curve according to the current flood standard and the flood discharge process line;
the calculation module is used for calculating to obtain the highest flood level according to the flood storage process curve and the flood regulation storage capacity curve;
the comparison module is used for comparing the highest flood level height with the top height of the tailing dam;
and the second determining module is used for determining that the current flood standard is a flood condition of overtopping and dam break of the tailing pond when the highest flood level is higher than the top of the tailing dam.
The method for determining the flood condition of overtopping dam break of the tailing pond comprises the steps of determining a flood storage process curve according to a current flood standard and a flood discharge process line, calculating a highest flood level according to the flood storage process curve and a flood regulation reservoir capacity curve, and determining that the current flood standard is the flood condition of overtopping dam break of the tailing pond when the highest flood level is higher than the top of the tailing dam. The method and the device have the advantages that the flood condition of overtopping dam break of the tailing pond is determined according to the flood standard, and the problems that the simulation result is inaccurate due to the fact that the flood condition is not consistent with the actual flood condition during simulation in the related technology, the influence of the flood process and the dam break on the downstream is inaccurate in the dam break process, and accurate basis cannot be provided for writing emergency plans and implementing disaster relief are solved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 is a flowchart of a method for determining a flood condition of a overtopping dam break of a tailings pond according to an exemplary embodiment of the present disclosure;
fig. 2 is a scatter diagram of a flood process line when the beach top elevation of a target tailings pond is 720m according to an exemplary embodiment of the present disclosure;
fig. 3 is a scatter diagram of a flood diversion reservoir capacity curve when the beach top elevation of a target tailings reservoir is 720m according to an exemplary embodiment of the present disclosure;
fig. 4 is a scatter diagram of flood process lines and flood discharge process lines when the beach top elevation of the target tailings pond is 720m according to an exemplary embodiment of the present disclosure;
fig. 5 is a scatter diagram of a flood level process line when the beach top elevation of the target tailings pond is 720m according to an exemplary embodiment of the present disclosure;
fig. 6 is a scatter diagram of a flood process line when the beach top elevation of the target tailings pond is 745m according to an exemplary embodiment of the present disclosure;
fig. 7 is a scatter diagram of a flood diversion reservoir capacity curve when the beach top elevation of the target tailings reservoir is 745m according to an exemplary embodiment of the present disclosure;
fig. 8 is a scatter plot of flood process lines and flood discharge process lines at a beach top elevation of 745m for a target tailings pond provided by an exemplary embodiment of the present disclosure;
fig. 9 is a scatter diagram of flood level process lines when the beach top elevation of the target tailings pond is 745m according to an exemplary embodiment of the present disclosure;
fig. 10 is a scatter diagram of a flood process line when the beach top elevation of the target tailings pond is 780m, according to an exemplary embodiment of the present disclosure;
fig. 11 is a scatter diagram of a flood diversion reservoir capacity curve when the beach top elevation of the target tailings reservoir is 780m according to an exemplary embodiment of the present disclosure;
fig. 12 is a scatter plot of flood process lines and flood discharge process lines at a beach top elevation of 780m for a target tailings pond provided by an exemplary embodiment of the present disclosure;
fig. 13 is a scatter diagram of a flood level process line when the beach top elevation of the target tailings pond is 780m according to an exemplary embodiment of the present disclosure;
fig. 14 is a scatter diagram of a flood diversion reservoir capacity curve when the beach top elevation of the target tailings reservoir is 840m, according to an exemplary embodiment of the present disclosure;
fig. 15 is a scatter plot of flood process lines and flood discharge process lines at a beach top elevation of 840m for a target tailings pond according to an exemplary embodiment of the present disclosure;
fig. 16 is a scatter diagram of a flood level process line when the beach top elevation of the target tailings pond is 840m according to an exemplary embodiment of the disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a detailed description thereof will be omitted.
One skilled in the relevant art will recognize, however, that the embodiments of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure.
The terms "a", "an", "the" and "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and the like are used merely as labels, and are not intended to limit the number of objects
In the present exemplary embodiment, a method for determining a flood condition of overtopping dam break of a tailings pond is first provided, as shown in fig. 1, the method for determining a flood condition of overtopping dam break of a tailings pond includes the following steps:
step S110, determining a flood storage process curve according to the current flood standard and a flood discharge process line;
step S120, calculating the highest flood level according to the flood storage process curve and the flood regulation storage capacity curve;
step S130, comparing the height of the highest flood level with the height of the top of the tailing dam;
and step S140, when the highest flood level is higher than the top of the tailing dam, determining that the current flood standard is a flood condition of overtopping and dam break of the tailing dam.
The method for determining the flood condition of the overtopping dam break of the tailing pond provided by the embodiment of the disclosure determines a flood storage process curve according to a current flood standard and a flood discharge process line, calculates the highest flood level according to the flood storage process curve and a flood regulation reservoir capacity curve, and determines that the current flood standard is the flood condition of the overtopping dam break of the tailing pond when the highest flood level is higher than the top of the tailing dam. The method and the device have the advantages that the flood condition of overtopping dam break of the tailing pond is determined according to the flood standard, and the problems that the simulation result is inaccurate due to the fact that the flood condition is not consistent with the actual flood condition during simulation in the related technology, the influence of the flood process and the dam break on the downstream is inaccurate in the dam break process, and accurate basis cannot be provided for writing emergency plans and implementing disaster relief are solved.
Further, when the highest flood level is lower than the top of the tailing dam, the method for determining the flood condition of overtopping dam break of the tailing pond provided by the embodiment of the disclosure further comprises the following steps:
step S150, when the highest flood level is lower than the top of the tailing dam, updating the current flood standard until the highest flood level is higher than the top of the tailing dam, and determining that the current flood standard is a flood condition of overtopping and dam break of the tailing dam.
And updating the current flood standard until the highest flood level is higher than the crest of the tailing dam, and when the highest flood level is lower than the crest of the tailing dam, improving the flood standard, for example, if the current flood standard is 100 years, improving the flood standard to be 200 years, 300 years, 500 years, 100 years and the like. And repeating the steps S110, S120 and S130 after the flood standard is improved, and repeating the steps until the highest water level corresponding to the flood standard is higher than the top of the tailing dam, wherein the current flood standard can be determined as the flood condition that the tailing dam breaks through the top of the tailing dam.
Further, the method for determining the flood condition of overtopping and dam break of the tailing pond further comprises the following steps:
step S150, comparing the flood condition of overtopping dam break of the tailings pond with the historical maximum flood, and when the historical maximum flood is larger than the flood condition of overtopping dam break of the tailings pond, determining that the historical maximum flood is the flood condition of overtopping dam break of the tailings pond.
Since the acquired flood condition of the overtopping and dam break of the tailing dam may not be the historical maximum flood through the step S140 or the step S150, in some extreme cases, simulation of the tailing dam under the historical maximum flood condition is required, the flood condition of the overtopping and dam break of the tailing pond and the historical maximum flood may be compared, and when the historical maximum flood is greater than the flood condition of the overtopping and dam break of the tailing pond, it is determined that the historical maximum flood is the flood condition of the overtopping and dam break of the tailing pond. The influence of the flood process after overtopping and dam break of the tailing pond and the dam break on the downstream can be simulated, and accurate basis is provided for compiling emergency plans and implementing disaster relief.
The following will explain in detail the steps of the flood condition method for overtopping and dam break of the tailings pond provided by the embodiment of the present disclosure:
in step S110, a flood storage process curve may be determined according to the current flood standard and the flood discharge process line.
Determining a flood storage process curve according to the current flood standard and a flood discharge process line, wherein the steps of:
calculating to obtain a flood process curve according to the current flood standard;
and obtaining a flood storage process curve according to the flood process curve and the flood discharge process line.
Calculating a flood process curve according to the current flood standard, wherein the flood process curve comprises the following steps: calculating a flood process curve according to a current flood standard through a first formula, wherein the first formula is as follows:
wherein Qp is the peak flow rate of the flood with frequency P, sp is the rainstorm force with frequency P, F is the catchment area of the reservoir area, m is the confluence parameter, L is the length of the main ditch of the reservoir area, j is the average slope drop in the ditch, mu is the average infiltration rate of the residual duration, and A, B, C and D are the maximum peak flow rate calculation indexes.
The rainstorm force Sp with frequency P is calculated by a second formula:
wherein H 24p Is the 24 hour rainfall at frequency P, n 2 Is a second rainstorm decreasing index.
24 hours rainfall H at frequency P 24P Calculated by a third formula:
H 24P ＝K P H 24
wherein, K P Is the modulus coefficient, H 24 The average rainfall is the maximum rainfall 24 hours per year.
Determining the maximum peak flow calculation indexes A, B, C and D in the first formula, wherein the steps comprise:
and selecting the maximum peak flow calculation indexes A, B, C and D according to the rainstorm decreasing index.
According to the method, the flood process line under the current flood standard can be calculated through the first formula, the second formula and the third formula, the flood discharge process line of the tailings dam is the inherent characteristic, and the flood storage process curve can be obtained by subtracting the flood discharge process line from the flood process line. A. B, C and D can be selected from a design manual according to the rainstorm attenuation index. When the descending index of rainstorm is less than or equal to 1, n = n 1 ；γ>1, n = n 2 γ is the duration of sink flow, n 1 Is a first rainstorm decreasing index, n 2 Is a second rainstorm decreasing index.
In step S120, a maximum flood level may be calculated according to the flood storage process curve and the flood diversion reservoir capacity curve, including:
acquiring flood regulation capacity according to the flood regulation storage capacity curve;
calculating the total flood amount according to the flood storage process curve;
and calculating the highest flood level according to the total flood amount and the capacity of the flood regulation reservoir.
The flood regulation capacity of a determined tailing pond and a determined flood regulation pond is inherent, the flood regulation capacity can be obtained according to a flood regulation pond capacity curve, the total flood amount in a specified time can be calculated according to a flood storage process curve, and then the highest water level in the tailing pond is calculated according to the total flood amount and the flood regulation capacity.
For example, the formula for calculating the total flood amount is as follows:
W tp ＝1000α 24 H 24p F
in the formula: w tp The total flood quantity with a preset frequency P, alpha is a rainfall runoff coefficient lasting for 24 hours, H 24p Is 24 hours at a preset frequency PThe rainfall is measured, and F is the catchment area of the reservoir area.
In step S140, when the highest flood level is higher than the crest of the tailing dam, it is determined that the current flood standard is a flood condition for overtopping and breaking the tailing dam.
In practical application, after the flood condition of overtopping dam break of the tailing pond is determined, the flood storage process curve corresponding to the flood condition can be used for the numerical simulation analysis of overtopping dam break. And converting the flood storage process line into a model flood storage process line according to a similar law and a model scale for overtopping dam-break model test.
For example, the maximum dam height of a target tailing dam is 195m, and the storage capacity is 1.24 hundred million m 3 According to the design specification of tailing facilities of a concentrating mill, a target tailing dam is a second-class reservoir, the flood standard of the target tailing dam in each service period is determined according to the grade of the target tailing dam in each service period, and the flood standard of each service period is determined according to the grade of the target tailing dam in each service period, and the flood standards are shown in tables 1 and 2.
Table 1, grade and flood protection standard of the target tailings pond:
table 2 flood standard for each service life of target tailings pond
The catchment area of the target tailing pond is 6.35km 2 The main trench is about 4.25km long and the weighted average slope is 8.8%. Designing a rainstorm flood map set and a rainstorm parameter map set according to the small and medium drainage basins where the target tailing pond is located, and calculating the flood calculation parameters of the target tailing pond area
Rainstorm decreasing index n 1 ＝0.50，n 2 ＝0.75，Cv＝0.75，Cs＝3.5Cv，K p＝0.5％ ＝4.55，K p＝0.2％ ＝5.38，K p＝0.1％ =6.02. And carrying out flood calculation according to the calculation formula of the peak flow and the total flood amount, wherein the calculation result is shown in a table 3:
TABLE 3 flood calculation result TABLE
Specifically, the flood drainage system adopts a drainage well-vertical shaft-tunnel combined flood drainage mode to drain the flood to the downstream of the tailing pond. According to flood calculation, a framed drainage well with the diameter D =5.0m, a vertical well with the diameter 4m and a tunnel with the diameter D =3.5m are selected. The number of the drainage wells is 5, the heights of No. 0, no. 1, no. 2 and No. 3 drainage wells are 36m, the height of No. 4 drainage well is 26m, and the length of a main hole is 2121m. The outlet of the main hole is provided with a stilling pool, and the stilling pool is 35m long and 5m wide.
The minimum water inlet elevation of the No. 0 well is 690m, the top elevation of the well is 726m, the minimum water inlet elevation of the No. 1 well is 710m, the top elevation of the well is 746m, the minimum water inlet elevation of the No. 2 well is 745m, the top elevation of the well is 781m, the minimum water inlet elevation of the No. 3 well is 780m, the top elevation of the well is 816m, the minimum water inlet elevation of the No. 4 well is 815m, and the top elevation of the well is 841m.
Carry out target tailing storehouse drainage system drainage well and tunnel hydraulic model test, the experimental flood discharge flow who reachs the drainage facility of reacing, see table 4:
TABLE 4 flood discharge flowmeter
| Head height H (m) | 0 | 0.4 | 1.0 | 2.6 | 5.0 |
| Discharge rate Q (m) 3 /s) | 0.0 | 2.34 | 18.5 | 96.3 | 126.0 |
Specifically, flood regulation calculation is carried out on each service life of the target tailing pond, and the most dangerous working condition of each service life of the tailing pond is selected as the flood regulation calculation working condition according to the service condition of the drainage well and the capacity of the flood regulation pond. The flood regulation of the target tailing pond is fully calculated and 4 service periods are selected as typical working conditions, and the elevation selection of the flood regulation calculation of each service period is shown in a table 5. The average gradient of the sedimentary beach of the target tailing pond is about 2.62 percent, and the gradient of the sedimentary beach of the target tailing pond is 1 percent by flood diversion calculation.
TABLE 5 flood regulation calculation elevation of target tailing pond in each service period
Specifically, the target tailing dam is a stacking tailing dam. When the target tailing pond is used from the beginning to the initial dam full (the height of the beach top is 720 m), the height of the beach top is 720m and is selected as the flood regulation calculation elevation. According to the design specification of tailing facilities of a concentrating mill, a target tailing pond is a third-class pond in the service period from the start of the tailing pond to the full piling period of an initial dam (the height of a beach top is 720 m), and the flood control standard is designed according to 200-year first chance. According to the requirements of design regulations of tailing facilities of concentrating plants, the minimum beach length is 70m, the minimum safety height is 0.7m, and according to the requirements of earthquake-resistant design regulations of structures, the minimum beach length is not less than the height of a dam body, namely 75m.
Wherein, the flood process line adopts a generalized multi-peak triangular flood process line, and the main rain peak is arranged on the three-quarter process of the designed rainfall duration from the safety point of view. According to the design specification, when the design frequency flood meeting for 200 years is encountered in the early stage, the flood process line is shown in figure 2.
The dry beach length of the target tailing dam is 600m, the slope of the dry beach is 1%, the normal water level (flood prevention limited water level in flood season) in the reservoir is controlled below the elevation of 714m, when flood occurs in 200 years, the maximum flood level is controlled below the elevation of 719m, and the dry beach length is not less than 100m. The flood control storage capacity curve when the water level in the target tailing storage is 714m is shown in figure 3.
And calculating a flood discharge process line through water balance according to the flood discharge process line, the flood discharge capacity curve and the flood regulation reservoir capacity curve, so as to determine the maximum discharge capacity and the maximum flood level. The flood and flood discharge process lines, flood level-time curves are shown in fig. 4 and fig. 5, respectively. In fig. 4, X is a flood process line and Y is a flood discharge process line.
As can be seen from fig. 4 and 5, at the elevation of 720m, the maximum flood level of the target tailing pond appears 18 hours and 44 minutes after the flood occurs, which corresponds to the maximum flood regulation capacity of about 81.46 ten thousand m3 and the maximum discharge capacity of 125.78m3/s. At the moment, the rise height of the flood level is 4.85m, the elevation of the flood level is 718.85m, and the elevation of the flood level is 1.15m away from the elevation of the dam crest of 720m, so that the requirements of safety, super-high level and the like are met. The slope of the dry beach is calculated according to the ratio of 1:100, the length of the dry beach is 115m, and the requirement of the specification (not less than 75 m) is met.
Specifically, the beach top elevation 745m is selected as the flood regulation elevation in the service life from the beach top elevation 745m to the beach top elevation 780m (not included). When the beach top is 745m high, the dam is 100m high, and the total storage capacity is 1800 ten thousand m3. According to the design specification of tailing facilities of a concentrating mill, a target tailing pond is a second-class pond from a beach top standard height of 745m to a beach top standard height of 780m (excluding) in service life, and the flood control standard is designed according to 500-year first-chance. According to the requirements of design specifications of tailing facilities of a concentrating mill, the minimum beach length is 100m, the minimum safety height is 1.0m, and according to the requirements of earthquake-resistant design specifications of structures, the minimum beach length is not less than the height of a dam body, namely 100m.
The flood process line adopts a generalized multi-peak triangular flood process line, and the main rain peak is arranged on the three-quarter process of the designed rainfall duration from the safety point of view. According to the design specifications, when the design frequency flood of 500 years is encountered in the early stage, the flood process line is shown in fig. 6.
The dry beach of the target tailing dam is 600m long, the slope of the dry beach is 1%, the normal water level (flood prevention limited water level in flood season) in the reservoir is controlled below the elevation of 739m, when flood occurs in 500-year first chance, the designed maximum flood level is controlled below the elevation of 744m, and the length of the dry beach is not less than 100m. The curve of flood control storage capacity when the water level in the target tailing storage is 739m is shown in figure 7.
And calculating the flood discharge process line through water balance according to the flood process line, the flood discharge capacity curve and the flood regulation reservoir capacity curve, so that the maximum discharge capacity and the maximum flood level are determined. The flood and flood discharge process lines, flood level-time curves are shown in fig. 8 and fig. 9, respectively. In fig. 8, X is a flood process line, and Y is a flood discharge process line.
As can be seen from fig. 8 and 9, when the elevation of 744m is high, the highest flood level of the target tailing pond occurs 19 hours and 2 minutes after the flood occurs, which corresponds to the maximum flood regulation pond capacity of about 122.0 ten thousand m3 and the maximum discharge rate of 125.3m3/s. At the moment, the rise height of the flood level is 4.39m, the elevation of the flood level is 743.39m, and the elevation is 1.61m away from the elevation 745m of the dam top, so that the requirements of ultrahigh safety, wind wave climbing and the like are met. The slope of the dry beach is calculated according to 1.
Specifically, during the service period from the beach top elevation 745m to the beach top elevation 780m, the beach top elevation 780m and 840m are selected as flood regulation calculation elevations. When the beach top mark is 780m high, the dam is 135m high, and the total storage capacity is 4400 ten thousand m3. According to design specifications of tailing facilities of a concentrating mill, a target tailing pond is a second-class pond from 745m of beach top elevation to 780m of beach top elevation in service life, and flood control standards are designed according to 1000-year first-chance. The minimum beach length is 100m according to the design specification of tailing facilities of a concentrating mill, the minimum safety height is 1.0m, and the minimum beach length is not less than the height of a dam body, namely 135m according to the requirement of the earthquake-resistant design specification of structures.
The flood process line adopts a generalized multi-peak triangular flood process line, and from the safety point of view, the main rain peak is placed in the three-quarter process of the designed rainfall duration, and when the design frequency flood of 1000-year first encounters is encountered, the flood process line is shown in a figure 10.
The dry beach length of the target tailing dam is 700m, the slope of the dry beach is 1%, the normal water level (flood prevention limited water level in the flood season) in the reservoir is controlled below the 773m elevation, when flood occurs in 1000 years, the designed maximum flood level is controlled below the 778m elevation, and a flood regulation reservoir capacity curve when the dry beach length is not less than 200m and the water level in the target tailing reservoir is 773m is shown in figure 11.
And calculating the flood discharge process line through water balance according to the flood process line, the flood discharge capacity curve and the flood regulation reservoir capacity curve, so that the maximum discharge capacity and the maximum flood level are determined. The flood and flood discharge process lines, flood level-time curves are shown in fig. 12 and fig. 13, respectively. In fig. 12, X is a flood process line and Y is a flood discharge process line.
As can be seen from fig. 12 and 13, at 780m elevation, the highest flood level of the target tailing pond appears 19 hours and 12 minutes after the flood occurs, corresponding to the maximum required flood regulation capacity of about 174.07 ten thousand m3, and the maximum discharge capacity of 123.48m3/s. At the moment, the rise height of the flood level is 3.55m, the elevation of the flood level is 776.55m, is lower than 778m of the designed highest flood level, and is 3.45m away from the elevation 780m of the dam top, so that the requirements of ultrahigh safety, wind wave climbing and the like are met. The dry beach slope is calculated according to 1.
Specifically, when the beach top elevation is 840m, the dam height is 195m, and the total storage capacity is 1.24 hundred million m3. According to the design specification of tailing facilities of a concentrating mill, a target tailing pond is a second-class pond from 780m of beach top standard height to 840m of beach top standard height within the service life, and the flood control standard is designed according to 1000-year first-chance. The minimum beach length is 100m according to the design specification of tailing facilities of a concentrating mill, the minimum safety height is 1.0m, and the minimum beach length is not less than the height of a dam body, namely 195m according to the requirement of earthquake-resistant design specification of structures.
The flood process line in 1000 years is shown in figure 10.
The dry beach of the target tailing dam is 800m in length, the slope of the dry beach is 1%, the normal water level (flood season flood control limit water level) in the reservoir is controlled below the level of 832m, when flood occurs in 1000 years, the maximum flood level is designed to be controlled below the level of 837m, and the length of the dry beach is not less than 300m. The flood control storage capacity curve when the water level in the target tailing storage is 832m is shown in figure 14.
And calculating a flood discharge process line through water balance according to the flood discharge process line, the flood discharge capacity curve and the flood regulation reservoir capacity curve, so as to determine the maximum discharge capacity and the maximum flood level. The flood and flood discharge process lines, flood level-time curves are shown in fig. 15 and fig. 16, respectively. In fig. 15, X is a flood process line, and Y is a flood discharge process line.
As can be seen from fig. 15 and 16, at the height of 840m, the highest flood level of the target tailing pond appears at 46 minutes 19 hours after the flood occurs, which corresponds to about 225.3 ten thousand m3 of the maximum required flood regulation capacity and 76.2m3/s of the maximum discharge capacity. At the moment, the rise height of the flood level is 2.20m, the elevation of the flood level is 834.20m, is lower than the designed highest flood level 837m, and is 5.80m away from the elevation of the dam top, so that the requirements of ultrahigh safety, wind wave climbing and the like are met. The slope of the dry beach is calculated according to 1.
Known by the regulation flood calculus of above-mentioned 4 beach top elevation, 4 kinds of operating modes, the drainage ability of design drainage facility is satisfied standard requirement, as long as guarantee drainage system normal operating, the drainage passageway is unblocked, and drainage facility drainage ability can discharge the flood safely under the flood condition, can not influence the safety in target tailing storehouse.
The embodiment of the present disclosure further provides a device for determining flood conditions of overtopping dam break of a tailing pond, including:
the first determining module is used for determining a flood storage process curve according to the current flood standard and a flood discharge process line;
the calculation module is used for calculating to obtain the highest flood level according to the flood storage process curve and the flood regulation storage capacity curve;
the comparison module is used for comparing the highest flood level height with the top height of the tailing dam;
and the second determining module is used for determining that the current flood standard is a flood condition of overtopping and dam break of the tailing pond when the highest flood level is higher than the top of the tailing dam.
The flood condition determining device for overtopping and dam break of the tailing pond determines a flood storage process curve through a first determining module, a calculating module calculates the highest flood level, a comparing module compares the height of the highest flood level with the height of the top of the tailing dam, and when the highest flood level is higher than the top of the tailing dam, a second determining module determines that the current flood standard is the flood condition of overtopping and dam break of the tailing pond. The method and the device realize the determination of the flood condition of overtopping dam break of the tailing pond through the flood standard, and solve the problems that the simulation result is inaccurate due to the fact that the flood condition is inconsistent with the actual flood condition during simulation in the related technology, the influence of the flood process and the dam break on the downstream is inaccurate in the dam break process, and accurate basis cannot be provided for writing an emergency plan and implementing disaster relief.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (4)
1. A method for determining flood conditions of overtopping dam break of a tailing pond is characterized by comprising the following steps:
determining a flood storage process curve according to the current flood standard and the flood discharge process line;
calculating the highest flood level according to the flood storage process curve and the flood regulation reservoir capacity curve;
comparing the height of the highest flood level with the height of the top of the tailing dam;
when the highest flood level is higher than the top of the tailing dam, determining that the current flood standard is a flood condition of overtopping and dam break of the tailing pond;
when the highest flood level is lower than the crest of the tailing dam, updating the current flood standard until the highest flood level is higher than the crest of the tailing dam, and determining that the current flood standard is a flood condition of overtopping and breaking of the tailing pond;
comparing the flood condition of the overtopping dam break of the tailing pond with the historical maximum flood, and determining that the historical maximum flood is the flood condition of the overtopping dam break of the tailing pond when the historical maximum flood is larger than the flood condition of the overtopping dam break of the tailing pond;
wherein, according to the current flood standard and the flood discharge process line, determining a flood storage process curve comprises: calculating to obtain a flood process curve according to the current flood standard; obtaining a flood storage process curve according to the flood process curve and the flood discharge process line;
calculating to obtain a flood process curve according to the current flood standard, wherein the flood process curve comprises the following steps: calculating a flood process curve according to a current flood standard through a first formula, wherein the first formula is as follows:
qp is the peak flow rate of the flood with the frequency P, sp is the rainstorm force with the frequency P, F is the catchment area of the reservoir area, m is the confluence parameter, L is the length of the main ditch of the reservoir area, j is the average slope drop in the ditch, mu is the average infiltration rate of the residual duration, and A, B, C and D are the maximum peak flow rate calculation indexes;
the rainstorm force Sp with the frequency P is calculated by a second formula:
H 24p is the 24 hour rainfall at frequency P, n 2 A second rainstorm decreasing index;
24 hours rainfall H when the frequency is P 24P Calculated by a third formula:
K P is the modulus coefficient, H 24 For 24 hours at the maximumMean rainfall precipitation.
2. A flood condition determining method for a mine tailing pond overtopping dam break according to claim 1, further comprising:
determining the maximum peak flood flow calculation indexes A, B, C and D, wherein the steps comprise:
and selecting the maximum peak flow calculation indexes A, B, C and D according to the rainstorm decreasing index.
3. The method for determining flood conditions of overtopping dam break of the tailing pond according to claim 1, wherein the step of calculating the highest flood level according to the flood storage process curve and the flood diversion pond capacity curve comprises the following steps:
acquiring a flood regulating reservoir capacity according to the flood regulating reservoir capacity curve;
calculating the total flood amount according to the flood storage process curve;
and calculating the highest flood level according to the total flood amount and the flood regulation storage capacity.
4. A flood condition determination device for overtopping dam break of a tailing pond is characterized by comprising:
the first determining module is used for determining a flood storage process curve according to the current flood standard and the flood discharge process line;
the calculation module is used for calculating to obtain the highest flood level according to the flood storage process curve and the flood regulation storage capacity curve;
the comparison module is used for comparing the highest flood level height with the dam crest height of the tailing dam;
the second determination module is used for determining that the current flood standard is a flood condition of overtopping and dam break of the tailing pond when the highest flood level is higher than the top of the tailing dam;
the updating module is used for updating the current flood standard when the highest flood level is lower than the crest of the tailing dam until the highest flood level is higher than the crest of the tailing dam, and determining that the current flood standard is a flood condition of overtopping and dam break of a tailing pond;
the condition comparison module is used for comparing the flood condition of the overtopping dam break of the tailings pond with the historical maximum flood, and when the historical maximum flood is larger than the flood condition of the overtopping dam break of the tailings pond, the historical maximum flood is determined to be the flood condition of the overtopping dam break of the tailings pond
Wherein, according to current flood standard and flood discharge process line, confirm the curve of flood storage process, include: calculating to obtain a flood process curve according to the current flood standard; obtaining a flood storage process curve according to the flood process curve and the flood discharge process line;
calculating a flood process curve according to the current flood standard, wherein the flood process curve comprises the following steps: calculating to obtain a flood process curve according to a current flood standard through a first formula, wherein the first formula is as follows:
qp is peak flow with frequency P, sp is rainstorm force with frequency P, F is catchment area of the reservoir area, m is confluence parameter, L is length of main ditch of the reservoir area, j is average slope drop in the ditch, mu is average infiltration rate of residual duration, and A, B, C and D are maximum peak flow calculation indexes;
the rainstorm force Sp with the frequency P is calculated by a second formula:
H 24p is the 24 hour rainfall at frequency P, n 2 A second rainstorm decreasing index;
24 hours rainfall H when the frequency is P 24P Calculated by a third formula:
K P is a modulus coefficient, H 24 The first yearAverage rainfall 24 hours in size.
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| CN110362925B (en) * | 2019-07-16 | 2020-05-19 | 中国水利水电科学研究院 | Method for simulating overtopping and bursting flood numerical value of earth and rockfill dam comprising reservoir area |
| CN111275242A (en) * | 2020-01-08 | 2020-06-12 | 昆明理工大学 | Downstream protection tailing pond flood regulating method based on tabu search optimization algorithm |
| CN111311734A (en) * | 2020-02-14 | 2020-06-19 | 中核第四研究设计工程有限公司 | Three-dimensional numerical simulation method for hydraulic characteristics of flood discharge system of uranium tailing pond |
| CN112101697B (en) * | 2020-07-17 | 2021-06-22 | 中国安全生产科学研究院 | Tailings pond flood regulating calculation system flow manager |
| CN112287528B (en) * | 2020-10-16 | 2021-07-20 | 黄河勘测规划设计研究院有限公司 | Flood control high water level determination method for sandy river reservoir based on high beach trough |
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