CN113902351A - Swedish striping method-based tailing pond dam slope anti-slip stability analysis method - Google Patents
Swedish striping method-based tailing pond dam slope anti-slip stability analysis method Download PDFInfo
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Abstract
The invention discloses a Swedish segmentation method-based tailing pond dam slope anti-slip stability analysis method, which comprises the following steps of: in the field geological exploration of the dam slope of the tailing pond, namely determining the range of the tailing dam according to the field geological exploration, and determining the physical and mechanical parameters of a dam body of a primary dam of the tailing pond, a tailing accumulation body and a dam foundation rock-soil layer through a rock-soil test; monitoring a tailing reservoir dam slope infiltration line in real time; calculating the anti-skid stability coefficient of the tailing reservoir dam slope; the invention discloses a real-time early warning of dam breakage of a tailing pond, which realizes the early warning of the tailing pond by adopting the dam body of the initial dam of the tailing pond, a tailing accumulation body and the soil body physical and mechanical parameters of a dam foundation rock-soil layer, combining the real-time dam body wetting line monitoring data and further calculating the direct index of the slope anti-slip stability coefficient of the tailing pond based on the Swedish segmentation theory and the landslide stability analysis method theory through the geological exploration of the tailing dam.
Description
Technical Field
The invention relates to the technical field of tailing ponds, in particular to a dam slope anti-slip stability analysis method of a tailing pond based on a Swedish segmentation method.
Background
The tailing pond is a place which is formed by damming and intercepting a valley opening or surrounding land and is used for piling metal or nonmetal mines and discharging tailings or other industrial waste residues after ore sorting, the tailing pond is an artificial debris flow danger source with high potential energy, dam breaking danger exists, and serious accidents are easily caused once the tailings pond is crashed.
From the perspective of protecting ecological environment and guaranteeing the safety of public lives and properties, the method has very important significance in researching and analyzing the stabilization process of the tailing pond. However, in the existing analysis of the anti-slip stability of the dam slope of the tailing pond, only the mechanical stability of the tailing dam is considered, and only the mechanical stability index of the dam body is taken as the safety evaluation index of the tailing pond, so that the requirements of ecological environment protection and sustainable development of the tailing pond cannot be met.
The conventional mine waste reservoir safety monitoring is mainly carried out on site by manual regular use of a conventional instrument, the monitoring workload is large, manpower and material resources are excessively consumed, the mine waste reservoir safety monitoring is influenced by many factors such as weather, manpower and site conditions, certain system errors and manual errors exist, meanwhile, various technical parameters of mine waste reservoir operation cannot be monitored in real time through manual monitoring, and the problem that the monitoring precision of a monitoring method is not high generally exists. Aiming at the problems and the current situation of the environment of the tailing pond, the research provides a method for analyzing and predicting the stability of the anti-sliding of the dam slope of the tailing pond based on a Swedish segmentation method, and has positive significance and influence on the treatment of the tailing pond.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made keeping in mind the above problems occurring in the prior art.
Therefore, the invention aims to provide a dam slope anti-slip stability analysis method for a tailing pond based on a Swedish segmentation method, and aims to solve the problems that the safety monitoring workload of the tailing pond is large, certain system errors and manual errors exist, and the monitoring precision of the monitoring method is not high.
In order to solve the above problems, the present invention proposes the following technical solutions: a tailing pond dam slope anti-slip stability analysis method based on a Swedish striping method is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
the method comprises the following steps: determining the range of a tailing dam according to on-site geological exploration, determining physical and mechanical parameters of a dam body of an initial dam of the tailing pond, a tailing accumulation body and a dam foundation rock-soil layer through a rock-soil test, and making a corresponding tailing dam monitoring scheme;
step two: building a real-time monitoring station and embedding and installing a sensor, and realizing real-time monitoring, data transmission and storage to a control center;
step three: establishing a Swedish segmentation method-based calculation model, calculating, displaying and storing the anti-slip stability coefficient of the dam slope of the tailing pond;
step four: and the control center compares the early warning grading indexes of the soil slope according to the calculation result, and carries out monitoring and early warning on the slope of the tailing reservoir dam.
The preferable scheme of the method for analyzing the stability of the dam slope sliding resistance of the tailings pond based on the Swedish striping method is as follows: the second step is as follows:
a. determining a monitoring range of a tailing dam according to field exploration of a tailing dam slope, carrying out dam body infiltration line monitoring point arrangement, and burying and installing a sensor;
b. and further carrying out real-time monitoring on the seepage line of the dam body of the tailing dam, and transmitting and storing monitoring data to a control center in real time through 4G/5G wireless transmission.
The preferable scheme of the method for analyzing the stability of the dam slope sliding resistance of the tailings pond based on the Swedish striping method is as follows: the Swedish striping method related to the third step comprises the following assumptions: assuming that the sliding surface is an arc surface, dividing the sliding body into a plurality of vertical soil strips, and neglecting the interaction force among the soil strips; according to this assumption, any soil strip is only subject to self-gravity FWiShear force F on sliding surfaceTiAnd normal force FNiAnd solving the minimum safety factor of the mine tailing pond dam slope anti-skidding in real time.
The preferable scheme of the method for analyzing the stability of the dam slope sliding resistance of the tailings pond based on the Swedish striping method is as follows: the real-time solving method comprises the following steps:
calculating the sliding surface resultant force according to the soil mechanics theory:
Ni＝Wicosai；
the ultimate equilibrium condition on the arc surface can be obtained as follows:
the anti-slip moment generated on the sliding surface is:
from the moment balance, one can finally get:
in the formula, alpha i is the bottom slope angle of the ith bar; wi is the sum of the self weight of the bar block i and the upper load; ni is the total normal reaction force of the bottom of the bar i block; ti is the total tangential resistance of the bar i at the bottom; fs is the safety coefficient of the sliding arc; ci is the cohesion of the bar i; li is the length of the bottom of the bar i; phi i is the internal friction angle of the bar block i; r is the arc radius of the sliding surface.
The preferable scheme of the method for analyzing the stability of the dam slope sliding resistance of the tailings pond based on the Swedish striping method is as follows: the swedish striping method involved in step three, temporarily does not take external forces into account.
The preferable scheme of the method for analyzing the stability of the dam slope sliding resistance of the tailings pond based on the Swedish striping method is as follows: the landslide early warning and forecasting indexes in the fourth step are divided according to landslide stability states specified by a standard, and specifically comprise the following steps: according to the regulation of the specification, landslide stability is divided into four levels, namely a stable state (Fs is more than 1:15), a basic stable state (Fs is more than 1:05 and less than 1:15), an under-stable state (Fs is more than 1 and less than 1:05) and an unstable state (Fs is less than 1), and non-early warning, yellow early warning, orange early warning and red early warning are correspondingly adopted as early warning indexes.
The preferable scheme of the method for analyzing the stability of the dam slope sliding resistance of the tailings pond based on the Swedish striping method is as follows: and in the fourth step, after the minimum safety factor is calculated, the control center compares the minimum safety factor with the landslide early warning and forecasting index, so that the state of the landslide is judged, and the landslide state is output to a result.
The preferable scheme of the method for analyzing the stability of the dam slope sliding resistance of the tailings pond based on the Swedish striping method is as follows: the main physical mechanical parameters in the first step process comprise: the effective internal friction angle phi of the soil body, the effective cohesive force c of the soil body and the natural gravity gamma of the soil body.
The invention has the beneficial effects that:
1. according to the invention, through geological exploration of the tailing dam, the forecasting and early warning of the tailing pond are realized by adopting physical and mechanical parameters of a dam body of a primary dam of the tailing pond, a tailing accumulation body and a dam foundation rock-soil layer, combining real-time dam body infiltration line monitoring data and further calculating a direct index of the anti-slip stability coefficient of a dam slope of the tailing pond based on a Swedish segmentation method theory and a landslide stability analysis method theory;
2. compared with the existing early warning mode adopting soil body mechanical parameters, the early warning method directly combines real-time dam body infiltration line monitoring data, calculates the anti-slip stability of the dam slope of the tailing pond in real time, and standardizes the provided landslide stability evaluation index to determine the early warning level;
3. the method provided by the invention has the advantages of theoretical and scientific performance, objective calculation results, simple and practical procedure, simple indexes, applicability and easiness in change.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic flow chart of a tailings pond dam slope anti-slip stability analysis method based on a swedish striping method.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. .
Example 1
Referring to fig. 1, the invention provides a tailing pond dam slope anti-slip stability analysis method based on a swedish striping method, which comprises the following steps:
the method comprises the following steps: determining the range of the tailing dam according to on-site geological exploration, and determining physical and mechanical parameters of a dam body of the initial dam, a tailing accumulation body and a dam foundation rock-soil layer of the tailing pond through a rock-soil test: it should be noted that the main physical and mechanical parameters include: the effective internal friction angle phi of the soil body, the effective cohesive force c of the soil body and the natural gravity gamma of the soil body; meanwhile, the position of a pore water pressure gauge of a tailing reservoir dam slope is selected, and a monitoring scheme is worked out according to on-site exploration results.
Step two: determining a monitoring range of a tailing pond according to on-site exploration of a tailing pond dam slope, carrying out real-time monitoring of a dam body infiltration line, and transmitting and storing monitoring data to a control center in real time; based on the technical specification GB51108-2015 of the tailing pond online safety monitoring system, the immersion line monitoring cross section is combined with the surface displacement monitoring cross section, the number of the cross sections is not less than 3, the number of monitoring holes in each cross section is not less than 3, and the number of measuring points in the same monitoring hole is not less than 2.
Based on tailing facility design specifications (GB 50863), the depth of embedment of the sensor for real-time monitoring of the slope infiltration line of a tailing reservoir dam is shown in Table 1.
TABLE 1 minimum buried depth (m) of infiltration line of tailing dam
Step three: the invention establishes a stability coefficient calculation model based on the data of the saturation line of the tailing dam at different moments. And (3) calculating and determining the anti-slip stability coefficient of the dam slope of the tailing pond at different moments (t) by the control center through real-time returned tailing dam infiltration line real-time monitoring data by combining the formulas 1-5 on the basis of the method in the step two, and displaying and storing the anti-slip stability coefficient.
The following introduces the tailings pond safety coefficient solving process provided by the invention:
based on the specification, in the cross section of the dam body, the line with the pressure of 0 is the infiltration line of the tailing dam; according to the pressure information obtained by the pore water pressure gauge, obtaining h through the inverse calculation of a formula 1, wherein the sum of the embedded elevation of the pore water pressure gauge and the h is a pressure balance point, and the pressure balance points obtained by a plurality of pore water pressure gauges in the cross section are sequentially connected to form a wetting line of the cross section; based on the specification, the effective soil body weight below the saturation line should be the saturation weight-water weight (water weight 10kN/m 3).
p ═ ρ gh; equation 1
In the formula: p is the pressure, rho is the density, g is the acceleration of gravity, and h is the depth from the liquid level to the point.
According to the soil mechanics theory, the sliding body is divided into a plurality of vertical soil strips by a Swedish strip division method, and the interaction force among the soil strips is ignored; according to this assumption, any soil strip is subjected only to the self-gravity FWi, the shear force FTi on the sliding surface and the normal force FNi, and therefore, for any soil strip in the sliding body, the resultant sliding surface force is calculated:
Ni＝Wicosai(ii) a Equation 2
In the formula: alpha i is the bottom slope angle of the ith bar; wi is the sum of the self weight of the bar block i and the upper load; ni is the total normal reaction force of the bottom of the bar i block.
And (3) calculating the total tangential resistance of the bottom of the sliding surface according to the resultant force of the sliding surface obtained by the formula 2 and the limit balance condition on the sliding arc surface:
in the formula: ni is the total normal reaction force of the bottom of the bar i block; ti is the total tangential resistance of the bar i at the bottom; fs is the safety coefficient of the sliding arc; ci is the cohesion of the bar i; li is the length of the bottom of the bar i; phi i is the internal friction angle of the bar i.
Calculating the anti-slip moment generated on the sliding surface by the resultant force of the sliding surface obtained by the formula 2 and the total tangential resistance of the bottom obtained by the formula 3:
in the formula: ni is the total normal reaction force of the bottom of the bar i block; ti is the total tangential resistance of the bar i at the bottom; fs is the safety coefficient of the sliding arc; ci is the cohesion of the bar i; li is the length of the bottom of the bar i; phi i is the internal friction angle of the bar block i; r is the arc radius of the sliding surface.
The stability safety factor of the sliding surface can be finally obtained by moment balance:
in the formula: alpha i is the bottom slope angle of the ith bar; wi is the sum of the self weight of the bar block i and the upper load; ni is the total normal reaction force of the bottom of the bar i block; ti is the total tangential resistance of the bar i at the bottom; fs is the safety coefficient of the sliding arc; ci is the cohesion of the bar i; li is the length of the bottom of the bar i; phi i is the internal friction angle of the bar block i; r is the arc radius of the sliding surface.
Step four: and the control center compares landslide early warning grading indexes (table 2) according to the calculated landslide stability coefficient of the dam slope of the tailing pond, determines whether to send out early warning of corresponding grades or not, and issues an early warning result.
According to the landslide stability state division standard specified in landslide prevention and control engineering survey Specification (DZ/T0218-2006), the landslide early warning and forecasting index is divided into 4 grades, which is shown in Table 2.
TABLE 2 landslide warning grading index
The technical idea of the invention is as follows: the method is characterized in that the forming process and the mechanical mechanism of the dam slope of the tailing pond are used as theoretical bases, the monitoring data of the saturation line of the dam slope of the tailing pond at different moments are connected with the stability Fs of the tailing pond, and the minimum safety coefficient of the anti-sliding of the dam slope of the tailing pond is determined by applying a Swedish segmentation method, so that the stable state of the tailing pond is judged.
According to the technical idea, the basic technical principle of the tailing pond early warning method is as follows: and in the first step, determining basic data such as physical and mechanical parameters of a monitoring area of the tailing pond, a dam body of an initial dam of the tailing pond, a tailing accumulation body and a dam foundation rock-soil layer according to geological exploration. On the basis, the stability of the tailing pond is calculated according to the real-time monitoring data of the dam slope infiltration line of the tailing pond by using the basic data obtained in the first step and the second step and the Swedish segmentation method in the third step. And step four, judging and evaluating the stability of the tailing pond in the early warning area by comparing whether the calculated value reaches the early warning value according to the early warning grading index specified by the specification, so that the forecasting and early warning of the slope stability of the tailing pond are realized. The method is adopted to carry out forecast early warning on the dam slope of the tailing pond, and the stability of the dam slope of the tailing pond is calculated through real-time monitoring data of the dam slope infiltration line of the tailing pond to judge whether the dam slope of the tailing pond is close to or achieves instability damage, so that the method has higher reliability.
The early warning method provided by the invention is mainly suitable for the forecast early warning of the single-layer soil tailing pond, and adopts Python programming, wherein the program pseudo code is as follows:
the above disclosed inventive pseudo-code is intended only to aid in the explanation of the invention. The pseudo-code is not exhaustive of all of the details and does not limit the invention to the specific embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The pseudocode was chosen and described in order to best explain the principles of the invention and the practical application, thereby enabling others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. A tailing pond dam slope anti-slip stability analysis method based on a Swedish striping method is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
the method comprises the following steps: determining the range of a tailing dam according to on-site geological exploration, determining physical and mechanical parameters of a dam body of an initial dam of the tailing pond, a tailing accumulation body and a dam foundation rock-soil layer through a rock-soil test, and making a corresponding tailing dam monitoring scheme;
step two: building a real-time monitoring station and embedding and installing a sensor, and realizing real-time monitoring, data transmission and storage to a control center;
step three: establishing a Swedish segmentation method-based calculation model, calculating, displaying and storing the anti-slip stability coefficient of the dam slope of the tailing pond;
step four: and the control center compares the early warning grading indexes of the soil slope according to the calculation result, and carries out monitoring and early warning on the slope of the tailing reservoir dam.
2. The Swedish segmentation method-based tailing pond dam slope anti-slip stability analysis method according to claim 1, characterized in that: the second step is as follows:
a. determining a monitoring range of a tailing dam according to field exploration of a tailing dam slope, carrying out dam body infiltration line monitoring point arrangement, and burying and installing a sensor;
b. and further carrying out real-time monitoring on the seepage line of the dam body of the tailing dam, and transmitting and storing monitoring data to a control center in real time through 4G/5G wireless transmission.
3. The swedish striping method-based tailings pond slope anti-slip stability analysis method according to claim 1 or 2, wherein: the Swedish striping method related to the third step comprises the following assumptions: assuming that the sliding surface is an arc surface, dividing the sliding body into a plurality of vertical soil strips, and neglecting the interaction force among the soil strips; according to this assumption, any soil strip is only subject to self-gravity FWiShear force F on sliding surfaceTiAnd normal force FNiAnd solving the minimum safety factor of the mine tailing pond dam slope anti-skidding in real time.
4. The Swedish segmentation method-based tailing pond dam slope anti-slip stability analysis method according to claim 3, characterized in that: the real-time solving method comprises the following steps:
calculating the sliding surface resultant force according to the soil mechanics theory:
Ni＝Wicosai；
the ultimate equilibrium condition on the arc surface can be obtained as follows:
the anti-slip moment generated on the sliding surface is:
from the moment balance, one can finally get:
in the formula, alpha i is the bottom slope angle of the ith bar; wi is the sum of the self weight of the bar block i and the upper load; ni is the total normal reaction force of the bottom of the bar i block; ti is the total tangential resistance of the bar i at the bottom; fs is the safety coefficient of the sliding arc; ci is the cohesion of the bar i; li is the length of the bottom of the bar i; phi i is the internal friction angle of the bar block i; r is the arc radius of the sliding surface.
5. The swedish segmentation method-based tailing pond dam slope anti-slip stability analysis method according to any one of claims 1, 2 and 4, characterized in that: the swedish striping method involved in step three, temporarily does not take external forces into account.
6. The Swedish segmentation method-based tailing pond dam slope anti-slip stability analysis method according to claim 5, characterized in that: the landslide early warning and forecasting indexes in the fourth step are divided according to landslide stability states specified by a standard, and specifically comprise the following steps: according to the regulation of the specification, landslide stability is divided into four levels, namely a stable state (Fs is more than 1:15), a basic stable state (Fs is more than 1:05 and less than 1:15), an under-stable state (Fs is more than 1 and less than 1:05) and an unstable state (Fs is less than 1), and non-early warning, yellow early warning, orange early warning and red early warning are correspondingly adopted as early warning indexes.
7. The Swedish segmentation method-based tailing pond dam slope anti-slip stability analysis method according to claim 6, characterized in that: and in the fourth step, after the minimum safety factor is calculated, the control center compares the minimum safety factor with the landslide early warning and forecasting index, so that the state of the landslide is judged, and the landslide state is output to a result.
8. The Swedish segmentation method-based tailing pond dam slope anti-slip stability analysis method according to any one of claims 1, 2, 4, 6 and 7, wherein the method comprises the following steps: the main physical mechanical parameters in the first step process comprise: the effective internal friction angle phi of the soil body, the effective cohesive force c of the soil body and the natural gravity gamma of the soil body.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114580218A (en) * | 2022-05-07 | 2022-06-03 | 矿冶科技集团有限公司 | Tailing pond safety coefficient measuring method and device |
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| CN116307832A (en) * | 2023-01-16 | 2023-06-23 | 中煤科工开采研究院有限公司 | Alkaline residue dam stability evaluation method and device |
| CN117007506A (en) * | 2023-08-16 | 2023-11-07 | 北方工业大学 | Tailing dam loading test method under influence of lens body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114580218A (en) * | 2022-05-07 | 2022-06-03 | 矿冶科技集团有限公司 | Tailing pond safety coefficient measuring method and device |
| CN114580218B (en) * | 2022-05-07 | 2022-07-22 | 矿冶科技集团有限公司 | Tailing pond safety coefficient measuring method and device |
| CN115165014A (en) * | 2022-07-08 | 2022-10-11 | 中国地质科学院岩溶地质研究所 | Method for calculating tailing pile volume in karst depression tailing pond |
| CN116307832A (en) * | 2023-01-16 | 2023-06-23 | 中煤科工开采研究院有限公司 | Alkaline residue dam stability evaluation method and device |
| CN116307832B (en) * | 2023-01-16 | 2023-10-10 | 中煤科工开采研究院有限公司 | Alkaline residue dam stability evaluation method and device |
| CN117007506A (en) * | 2023-08-16 | 2023-11-07 | 北方工业大学 | Tailing dam loading test method under influence of lens body |
| CN117007506B (en) * | 2023-08-16 | 2024-04-02 | 北方工业大学 | Tailing dam loading test method under influence of lens body |
| CN117131713A (en) * | 2023-10-26 | 2023-11-28 | 中国地质科学院地质力学研究所 | Landslide stability calculation method based on geophysical prospecting weighted Swedish strip division method |
| CN117131713B (en) * | 2023-10-26 | 2024-01-23 | 中国地质科学院地质力学研究所 | Landslide stability calculation method based on geophysical prospecting weighted Swedish strip division method |
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