CN103924609A - Calculation method of required sectional area of rock filling blind ditch of valley type mine refuse dump - Google Patents

Abstract

The invention discloses a calculation method of a required sectional area of a rock filling blind ditch of a valley type mine refuse dump. The required sectional area A of the rock filling blind ditch of the valley type mine refuse dump is calculated according to the formula 1, wherein according to the formula 1, A=Qy/k*i<1/2> +aqs/2592000k*i<1/2>, A is the required sectional area of the rock filling blind ditch, the unit of A is m<2>, Qy is the drainage quantity, not directly affected by rainfall, in a basal spring or surface seepage, the unit of Qy is m<3>/s, k is the permeability coefficient of a rock filling body of the rock filling blind ditch, the unit of k is m/s, i is the longitudinal slope degree of the rock filling blind ditch and is dimensionless, a is the annually average atmospheric precipitation supply coefficient and is dimensionless, q is the annually average rainfall of the place where the mine refuse dump is located, the unit of q is m, s is the infiltration confluence area of the mine refuse dump, and the unit of s is m<2>. The method is used for quantitatively calculating the required sectional area of the rock filling blind ditch of the newly built valley type mine refuse dump, can avoid investment waste caused when the sectional area of a rock filling blind ditch is too large, or potential safety hazard caused when the sectional area of the rock filling blind ditch is too small, and has the good economic benefits and social benefits.

Description

The computational methods of refuse dump, gully type mine enrockment french drain demand basal area

Technical field

The invention belongs to mining technique field, more particularly, relate to the computational methods of refuse dump, a kind of gully type mine enrockment french drain demand basal area.

Background technology

Enrockment french drain is that a kind of penetration mode that adopts comes together in workspace or following more shallow large area underground water in ditch, and along ditch, water is discharged to the sewer of appointed place.The Applicative time of enrockment french drain in refuse dump, mine is shorter, and newly-built refuse dump, gully type mine was provided with enrockment french drain with ejectment refuse dump underground water in recent years, strengthens stability of dump.

Due to current domestic a kind of general refuse dump, gully type mine enrockment french drain demand basal area computational methods that there is no, in Practical Project, can only adopt analogy method to determine its demand basal area according to engineering experience, but adopt the definite enrockment french drain demand basal area of analogy method easily to depart from actual user demand, although when the section of enrockment french drain arranges the excessive ejectment demand that can meet refuse dump underground water while exceeding its user demand, can cause the waste of construction investment; When the section of enrockment french drain arranges too smallly, cannot meet the ejectment demand of refuse dump underground water, will cause refuse dump to dive under water for a long time in a high position, reduce stability of dump, form potential safety hazard.

Summary of the invention

For deficiency of the prior art, the object of the invention is to one or more in solving the problems of the technologies described above.

The present invention is directed to refuse dump, current gully type mine enrockment french drain demand basal area and determine that the middle problem existing provides a kind of refuse dump, gully type mine enrockment french drain demand basal area computational methods for using for reference.

To achieve these goals, the invention provides the computational methods of refuse dump, a kind of gully type mine enrockment french drain demand basal area, calculate the demand basal area A of refuse dump, described gully type mine enrockment french drain according to formula 1:

$A=\frac{Q_Y}{k\sqrt{i}}+\frac{\mathrm{aqs}}{2592000k\sqrt{i}}$ ---formula 1,

In formula, A is the demand basal area of enrockment french drain, m ²; Q _yfor the excretion that or not affected by amount of precipitation in substrate spring or face seepage flow, m ³/ s; K is the transmission coefficient of the rockfill of enrockment french drain, m/s; I is the longitudinal gradient gradient of enrockment french drain, dimensionless; A is annual mean atmospheric precipitation supply coefficient, dimensionless; Q is the average annual amount of precipitation of casting place, mine on ground, m; S is the catchment area that infiltrates of refuse dump, mine, m ².

According to an embodiment of the computational methods of refuse dump, gully type of the present invention mine enrockment french drain demand basal area, calculate the osmotic coefficient k of the rockfill of described enrockment french drain according to formula 2:

$k=\frac{n\sqrt{d}}{5}-\frac{7n}{50\sqrt{d}}$ ---formula 2,

In formula, n is the interconnected pore rate of the rockfill of enrockment french drain, dimensionless; D is the average grain diameter of the rockfill of enrockment french drain, cm.

According to an embodiment of the computational methods of refuse dump, gully type of the present invention mine enrockment french drain demand basal area, d > 6cm.

According to an embodiment of the computational methods of refuse dump, gully type of the present invention mine enrockment french drain demand basal area, the catchment area s that infiltrates of refuse dump, mine is own level projected area s1 and the border, refuse dump, mine of refuse dump, mine and cuts the domatic horizontal projected area s2 sum between big vast flood discharge facility outside the venue.

The present invention can be used for the quantification of newly-built refuse dump, gully type mine enrockment french drain demand basal area and calculates, solve at present and can only adopt analogy method to determine its basal area and easily depart from the present situation of actual user demand according to engineering experience, can avoid, because enrockment french drain basal area arranges the excessive phenomenon that causes investment waste or french drain basal area that too small formation potential safety hazard is set, thering is good economic and social benefit.

Brief description of the drawings

Fig. 1 is the plan view of refuse dump, typical gully type mine.

Fig. 2 is the profile of typical enrockment french drain.

1-enrockment french drain, 2-cut Great Gulch, 3-dam, A-enrockment french drain basal area.

Detailed description of the invention

Hereinafter, the computational methods of refuse dump, gully type of the present invention mine enrockment french drain demand basal area will be described in detail.

Fig. 1 is the plan view of refuse dump, typical gully type mine, and Fig. 2 is the profile of typical enrockment french drain.As depicted in figs. 1 and 2, enrockment french drain 1 is that a kind of penetration mode that adopts comes together in workspace or following more shallow large area underground water in ditch, and along ditch, water is discharged to the sewer of appointed place.Conventionally, in the outside, border of refuse dump, mine, a section Great Gulch 2 also can be set and enter in cheuch to stop the precipitation that a part is saved bit by bit, meanwhile, in the downstream of enrockment french drain, dam 3 also can be set and run off in a large number with the silt that prevents refuse dump.Because the demand basal area A of enrockment french drain directly affects drainability or the conveyance capacity of enrockment french drain, therefore need, to the estimation accurately of trying one's best of its demand basal area, its enough conveyance capacity, to reduce construction cost in the case of ensureing as far as possible.

The present invention is by analyzing the seepage action of ground water feature of refuse dump, gully type mine, set up and simplified the conceptual model of casting place, gully type mine in mountain valley bottom of trench seepage flow supply, deducing out a kind of Quantitative Calculation Method that can comparatively accurately determine refuse dump, gully type mine enrockment french drain demand basal area in conjunction with wise man's ability law afterwards.

According to exemplary embodiment of the present invention, the computational methods of refuse dump, described gully type mine enrockment french drain demand basal area are calculated the demand basal area A of refuse dump, described gully type mine enrockment french drain according to formula 1:

$A=\frac{Q_Y}{k\sqrt{i}}+\frac{\mathrm{aqs}}{2592000k\sqrt{i}}$ ---formula 1,

In formula, A is the demand basal area of enrockment french drain, m ²; Q _yfor the excretion that or not affected by amount of precipitation in substrate spring or face seepage flow, m ³/ s; K is the transmission coefficient of the rockfill of enrockment french drain, m/s; I is the longitudinal gradient gradient of enrockment french drain, dimensionless; A is annual mean atmospheric precipitation supply coefficient, dimensionless; Q is the average annual amount of precipitation of casting place, mine on ground, m; S is the catchment area that infiltrates of refuse dump, mine, m ².

According to exemplary embodiment of the present invention, calculate the osmotic coefficient k of the rockfill of described enrockment french drain according to formula 2:

$k=\frac{n\sqrt{d}}{5}-\frac{7n}{50\sqrt{d}}$ ---formula 2,

In formula, n is the interconnected pore rate of the rockfill of enrockment french drain, dimensionless; D is the average grain diameter of the rockfill of enrockment french drain, cm.

Below the derivation of formula 1, formula 2 is briefly explained.

Refuse dump, mine is the backwater water-accumulating body of Atmospheric precipitation, and the Source Of Supply of its bottom of trench seepage flow is mainly Atmospheric precipitation, substrate spring and/or face seepage flow.Therefore, the toe of refuse dump, mine goes out milliosmolarity Q _oozecomprise the excretion Q that not affected by amount of precipitation in substrate spring or face seepage flow _yincrement (P+R)-Q with Atmospheric precipitation to bottom of trench seepage flow _s, wherein, P drops to mine casting outside the venue but because slope runoff flows into the water yield (be border, refuse dump and cut the slope runoff between big vast flood discharge facility outside the venue) of refuse dump, mine, R is the water yield that directly drops to surface, refuse dump, mine, Q _sbe comprehensive amount and it amount that comprises the increment of system evaporation capacity, groundwater storage and drain by other approach.

To sum up, in 1 year refuse dump, mine toe go out milliosmolarity Q _oozecan be expressed as:

Q _ooze=31536000Q _y+ (P+R)-Q _s---formula 3

(P+R)-Q in above-mentioned formula 3 _scan be expressed as aqs, wherein, a is annual mean atmospheric precipitation supply coefficient, dimensionless; Q is the average annual amount of precipitation of casting place, mine on ground, m; S is the catchment area that infiltrates of refuse dump, mine, m ², thereby Q _oozealso can be expressed as:

Q _ooze=31536000Q _y+ aqs---formula 4

Because the seepage flow in the enrockment french drain of refuse dump, mine mostly is turbulent flow, follow just law of wise man, therefore the inflow-rate of water turbine of enrockment french drain can be expressed as:

---formula 5

In formula, Q _crossfor the inflow-rate of water turbine of enrockment french drain, m ³/ s; A is enrockment french drain basal area, m ²; K is the transmission coefficient of the rockfill of enrockment french drain, m/s; I is the longitudinal gradient gradient of enrockment french drain, dimensionless.

From formula 4, the seepage discharge of refuse dump, mine toe is mainly subject to rainfall recharge and spring to ooze out the impact of two factors of supply, and the demand conveyance capacity of enrockment french drain can be analyzed respectively for these two factors.For supply is oozed out at spring, its amount is generally less and can regard a constant as, should be thought of as with the instant increment at spring and equate for the demand conveyance capacity of this factor; For rainfall recharge, its amount is cyclically-varying taking year as unit conventionally, can regard a constant as, and incorporation engineering experience, should be thought of as the increment of discharging rainfall in a year in 30 days for the demand conveyance capacity of this factor.

Accordingly, the demand inflow-rate of water turbine of enrockment french drain can be expressed as:

---formula 6

Analyze based on above-mentioned enrockment french drain conveyance capacity and demand conveyance capacity, can set up following equation:

$\mathrm{Ak}\sqrt{i}=Q_y+\frac{\mathrm{aqs}}{2592000}$ ---formula 7

Can obtain above-mentioned formula 1 by formula 7:

$A=\frac{Q_y}{k\sqrt{i}}+\frac{\mathrm{aqs}}{2592000k\sqrt{i}}$ ---formula 1

Determining or choosing and describe the each calculating parameter in formula 1 below.

1) the excretion Q that not affected by amount of precipitation in spring or face seepage flow _y

For newly-built refuse dump, mine, Q _yvalue can obtain by the measurement of casting place, foot couple in dry season mine runoff in cheuch.

2) the longitudinal gradient gradient i of enrockment french drain

For the little enrockment french drain of change of longitudinal grade, its i value can adopt the sectionally weighting average of whole piece enrockment french drain; For the large enrockment french drain of change of longitudinal grade, the i value of answering segmentation meter to get its longitudinal gradient participates in calculating.

3) year Atmospheric precipitation supply coefficient a

The a value of Newly-built mine refuse dump can only or adopt analogy method to predict by model testing.

According to existing measured data, for metallurgical mine refuse dump, a value is generally between 0.6～0.9.

For both unconditionally carrying out model testing, newly-built refuse dump that again can be for reference without similar refuse dump, for security consideration, its a value desirable 0.9.

4) casting place in mine is at the average annual amount of precipitation q on ground

Can obtain at the hydrological data on ground by inquiry casting place, mine.

5) refuse dump, mine infiltrate catchment area s

The catchment area s that infiltrates of refuse dump, mine is own level projected area s1 and the border, refuse dump, mine of refuse dump, mine and cuts the domatic horizontal projected area s2 sum between big vast flood discharge facility outside the venue, specifically can be referring to Fig. 1.

Wherein, for s1, can, by refuse dump, the mine design end of a period boundary of banking up, adopt CAD automatically to calculate; For s2, can cut a flood drainage system and carry out trap in conjunction with bank up end of a period boundary, refuse dump, mine periphery landform and the design of refuse dump, mine of refuse dump, mine design, adopt CAD automatically to calculate.

6) osmotic coefficient k of the rockfill of enrockment french drain

The seepage velocity v of enrockment french drain can be expressed as

$v=\frac{\mathrm{Cn}\sqrt{\mathrm{di}}}{100}$ ---formula 8

In formula, v is the seepage velocity of enrockment french drain, m/s; C is efflux coefficient, cm, C=20-14/d; N is the transmission coefficient of the rockfill of enrockment french drain; D is the average grain diameter ， ㎝ of the rockfill of enrockment french drain; I is the longitudinal gradient gradient of enrockment french drain.

In conjunction with just law of wise man, can set up following equation

$\mathrm{Ak}\sqrt{i}=A\frac{\mathrm{Cn}\sqrt{\mathrm{di}}}{100}(d>6\mathrm{cm})$ ---formula 9

Can obtain k by formula 9:

$k=\frac{n\sqrt{d}}{5}-\frac{7n}{50\sqrt{d}}$ ---formula 2

Wherein, statistics shows, the transmission coefficient n of the rockfill of enrockment french drain generally between 15～25%, and the particle diameter of the rockfill of enrockment french drain more greatly, approximately even, n value is larger; The rockfill average grain diameter d of enrockment french drain is definite by designing.

Computational methods of the present invention are applicable to the refuse dump, gully type mine of conventional ground mixing.

Below in conjunction with concrete example, further the present invention will be described.

In this example, verify with mining industry Co., Ltd Baima Iron Mine IV refuse dump, the new Baima of Panzhihua, use computational methods of the present invention to calculate:

This refuse dump is a refuse dump, gully type mine, and the basal area of bottom of trench enrockment french drain is 7m ².From service condition in recent years, the row that the enrockment french drain that design arranges can meet refuse dump, mine is substantially oozed demand.

The demand basal area of calculating this refuse dump, mine enrockment french drain below by computational methods of the present invention, calculating parameter is in table 1.Calculating parameter shown in employing table 1 also uses formula 1 and formula 2 is calculated.

The calculating parameter table of table 1 enrockment french drain demand basal area

Calculating parameter	Q y	n	d	a
					Numerical value	0.009m 3/s	0.15	20cm	0.90
Calculating parameter	q	s1	s2	i
					Numerical value	1.10m	708836m 2	89760m 2	0.12

As calculated, the demand basal area A=7.00m of enrockment french drain ², consistent with actual conditions, reasonability of the present invention has been described.

In sum, refuse dump, gully type of the present invention mine enrockment french drain demand basal area computational methods are calculated, are contrasted through refuse dump, multiple ground water discharges of having implemented normal gully type mine relevant parameter, result shows that these computational methods meet engineering reality, can be used for the designing and calculating reference of refuse dump, mine enrockment french drain basal area.

Although above by having described the present invention in conjunction with exemplary embodiment, it will be apparent to those skilled in the art that in the case of not departing from the spirit and scope that claim limits, can carry out various amendments and change to exemplary embodiment of the present invention.

Claims (4)

1. computational methods for refuse dump, gully type mine enrockment french drain demand basal area, is characterized in that, calculate the demand basal area A of refuse dump, described gully type mine enrockment french drain according to formula 1:

$A=\frac{Q_Y}{k\sqrt{i}}+\frac{\mathrm{aqs}}{2592000k\sqrt{i}}$ ---formula 1,

In formula, A is the demand basal area of enrockment french drain, m ²;

Q _yfor the excretion that or not affected by amount of precipitation in substrate spring or face seepage flow, m ³/ s;

K is the transmission coefficient of the rockfill of enrockment french drain, m/s;

I is the longitudinal gradient gradient of enrockment french drain, dimensionless;

A is annual mean atmospheric precipitation supply coefficient, dimensionless;

Q is the average annual amount of precipitation of casting place, mine on ground, m;

S is the catchment area that infiltrates of refuse dump, mine, m ².

2. the computational methods of refuse dump, gully type according to claim 1 mine enrockment french drain demand basal area, is characterized in that, calculate the osmotic coefficient k of the rockfill of described enrockment french drain according to formula 2:

$k=\frac{n\sqrt{d}}{5}-\frac{7n}{50\sqrt{d}}$ ---formula 2,

In formula, n is the interconnected pore rate of the rockfill of enrockment french drain, dimensionless;

D is the average grain diameter of the rockfill of enrockment french drain, cm.

3. the computational methods of refuse dump, gully type according to claim 2 mine enrockment french drain demand basal area, is characterized in that, d > 6cm.

4. the computational methods of refuse dump, gully type according to claim 1 mine enrockment french drain demand basal area, it is characterized in that, the catchment area s that infiltrates of refuse dump, mine is own level projected area s1 and the border, refuse dump, mine of refuse dump, mine and cuts the domatic horizontal projected area s2 sum between big vast flood discharge facility outside the venue.