Design method of dam body for black rainwater flood drainage in flood drainage ditch of mining area

Abstract

The invention discloses a design method of a dam body for black rainwater flood drainage in a flood drainage ditch in a mining area, which comprises the following steps of: acquiring historical data of a local mining area, including a flood level H and a flood drainage ditch width L; the dam body is semicircular and V-shaped, the radius of the semicircular dam body or the side length of the V-shaped dam body is determined according to the width L of the flood drainage ditch, and the diameter of the semicircular dam body is equal to the width L of the flood drainage ditch; the calculation formula of the outflow area S1 of the flood drainage ditch when no dam body is arranged is S1 = L * H, the height of the false dam body is h, the outflow area of the flood drainage ditch when the dam body is arranged is S2, and when the outflow area S1 of the flood drainage ditch when no dam body is arranged is the same as the outflow area S2 of the flood drainage ditch when the dam body is arranged, it is regarded that the arrangement of the dam body has no influence on the flood discharge capacity of the flood drainage ditch; under the condition that the outflow area is not changed, the height of the dam body can be obtained; according to the method, the height of the dam body can be determined according to the flood level of the mining area, normal flood drainage is ensured under the condition that the flood drainage amount before and after the dam body is arranged is not changed, and early-stage black rainwater of the mining area can be intercepted.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy engineering, in particular to a dam body design method for black rainwater drainage in a mining area drainage ditch. Background Art

[0002] The existing open-pit mine drainage ditch is mainly used for site flood discharge. In order to treat the black rainwater in the mine, a "straight-line" dam is usually used in the drainage ditch to intercept the initial black rainwater in the mining area in sections to achieve the purpose of treating the black rainwater. However, if a "straight-line" dam is used in the drainage ditch, the drainage ditch will reduce its flood discharge capacity during the rainy season, lose its inherent flood discharge function, and there will be a flood risk; but if the dam is not set up, the black rainwater and silt problems cannot be treated. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a dam design method for black rainwater drainage in a mining area drainage ditch to solve the above problems.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A method for designing a dam body for black rainwater drainage in a mining area drainage ditch comprises the following steps:

[0006] S1: Acquire historical data of the local mining area, wherein the historical data includes flood water level H and drainage ditch width L;

[0007] S2: The dam body is set to be semicircular and V-shaped, and the orientation direction of the semicircular dam body and the V-shaped dam body is the same as the water flow direction, and the radius of the semicircular dam body or the side length of the V-shaped dam body is determined according to the width L of the flood drainage ditch, wherein the diameter of the semicircular dam is equal to the width L of the flood drainage ditch;

[0008] S3: The outflow area S1 of the flood drainage ditch when there is no dam. The calculation formula of the outflow area S1 is: S1 = L × H. Assuming that the height of the dam to be determined is h, the outflow area of ​​the flood drainage ditch when there is a dam is S2. When the outflow area S1 when there is no dam is the same as the outflow area S2 when there is a dam, it is considered that the installation of the dam has no effect on the flood discharge capacity of the flood drainage ditch;

[0009] S4: Let S1=S2. Under the condition that the outflow area of ​​the flood drainage ditch remains unchanged, the height of the dam body can be obtained. The height of the dam body is related to the flood water level H, and the dam body is constructed according to the calculated height of the dam body.

[0010] In the above invention, further, when the dam body is semicircular, the radius of the dam body is R=L / 2, and the outflow area is S2 半圆 The calculation formula is: S2 半圆 =πR×(Hh); when the outflow area of ​​the flood drainage ditch is S1=S2 半圆The calculation formula for the height h of the semicircular dam body can be obtained: L×H=πR×(Hh). Finally, the relationship between the height h of the semicircular dam body and the flood water level H is obtained by integration: h=(1-2 / π)×H.

[0011] In the above invention, further, when the dam body is V-shaped, the two sides of the dam body are L1 and L2 respectively. When designing the dam body, the side length of the dam body is L1 = L2 = L, and the outflow area is S2 V形 The calculation formula is: (L1+L2)×(Hh); when the outflow area of ​​the flood drainage ditch S1=S2 V形 The calculation formula for the V-type dam height h can be obtained: L×H=(L1+L2)×(Hh). Finally, the relationship between the V-type dam height h and the flood water level H is obtained by integration: h=H / 2.

[0012] The beneficial effects of the present invention are:

[0013] The present invention intercepts black rainwater through a special semicircular or V-shaped dam body. Compared with the "straight dam", the present invention can increase the discharge volume of the flood drainage ditch per unit time, and at the same time effectively improve the pressure resistance of the dam body; secondly, the method can also adaptively determine the height of the dam body according to the different flood levels in the mining area, ensuring that the normal flood discharge is guaranteed when the discharge volume before and after the dam body is set remains unchanged, and can also achieve the interception and sedimentation control of the initial black rainwater in the mining area, which is convenient for the subsequent dredging of the flood drainage ditch. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the flood drainage ditch of the present invention;

[0015] Figure 2 A top view of the semicircular dam body of the flood drainage ditch of the present invention;

[0016] Figure 3 for Figure 2 An expanded schematic diagram of a side sectional view;

[0017] Figure 4 A top view of a V-shaped dam body of a flood drainage ditch according to the present invention;

[0018] Figure 5 for Figure 4 Schematic diagram of the side section view. DETAILED DESCRIPTION

[0019] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0020] Embodiment 1:

[0021] This proposal aims to design a dam design method for black rainwater drainage in the mining area drainage ditch, solving the problem of intercepting black rainwater in sections without affecting the drainage capacity of the drainage ditch. The main technical point is to increase the outflow section through the new dam design under the condition that the flood level H remains unchanged, so as to ensure that the discharge capacity of the drainage ditch 1 remains unchanged.

[0022] A design method for a dam body for black rainwater drainage in a mining area drainage ditch, as shown in the attached Figure 1-3 As shown, the specific steps include:

[0023] S1: Acquire historical data of the local mining area, the historical data including flood water level H and flood drainage ditch width L. In this embodiment, a rectangular flood drainage ditch 1 which is common and widely used in real life is adopted. The flood water level H generally refers to the flood water level calculated based on the frequency of once in 50 years, and the flood water level H is fixed;

[0024] S2: The dam body 2 is set to be semicircular, and the orientation direction of the semicircular dam body is the same as the water flow direction, and the radius of the semicircular dam body is determined according to the width L of the flood drainage ditch, wherein the diameter of the semicircular dam is equal to the width L of the flood drainage ditch, that is, the radius R of the semicircular dam body is equal to L / 2; in this embodiment, the dam body 2 is set to be semicircular, which can effectively increase the flood discharge of the flood drainage ditch 1 per unit time, and at the same time can effectively improve the flood resistance pressure of the dam body 2;

[0025] S3: The outflow area S1 of the flood drainage ditch 1 when the dam body 2 is not installed. The calculation formula of the outflow area S1 is: S1 = L × H. Assuming that the height of the dam body 2 to be determined is h, the outflow area of ​​the flood drainage ditch 1 when the dam body 2 is installed is S2. When the outflow area S1 when the dam body 2 is not installed is the same as the outflow area S2 of the flood drainage ditch 1 when the dam body 2 is installed, it is considered that the installation of the dam body 2 has no effect on the flood discharge capacity of the flood drainage ditch 1; ensure that after the dam body 2 is built in the flood drainage ditch 1, the original outflow area of ​​the flood drainage ditch 1 per unit time is equal to the outflow area after the installation of the dam body 2, provided that the flood water level H remains unchanged;

[0026] When the dam body 2 is semicircular, the radius of the dam body 2 is R = L / 2, and the outflow area is S2 半圆 The calculation formula is:

[0027] S2 半圆 =πR×(Hh);

[0028] S4: Under the condition that the outflow area of ​​drainage ditch 1 remains unchanged, let S1 = S2 半圆 , the calculation formula for the height h of the semicircular dam body can be obtained: L×H=πR×(Hh), the dam body height h is related to the flood water level H, and finally the relationship between the height h of the semicircular dam body and the flood water level H is obtained through integration: h=(1-2 / π)×H, π takes the value of 3.14, and the height of the semicircular dam body can be obtained as 0.36H. It can be seen that if a semicircular dam body is used, the height of the dam body is only related to the annual flood water level H of the drainage ditch.

[0029] Finally, relevant personnel can build the dam body height according to the flood water level H, and according to the terrain conditions, they can set up the dam body in sections in the drainage ditch 1.

[0030] This method is practical. It can ensure normal flood discharge while keeping the flood discharge volume unchanged before and after the dam is set, and can also intercept and settle the initial black rainwater in the mining area, which is convenient for subsequent flood discharge ditch desilting. The dam body can also be adjusted according to the different flood water levels H of drainage ditches in different mining areas, and it is highly practical. The dam body form involved in this embodiment is suitable for drainage ditches with a small interception volume.

[0031] Preferably, after the height and shape of the dam body are determined, the dam body can be provided with a drain port (not shown in the attached drawings) in consideration of the sludge height so that the sludge can be drained in time during the rainy season to free up storage space before the next heavy rain.

[0032] Preferably, a water intake (not shown in the attached drawings) is provided on the dam body, so that the rainwater supernatant after standing can be used as water for road irrigation and landscaping.

[0033] Embodiment 2:

[0034] As attached Figure 4 and attached Figure 5 As shown, when the flood water level H and the width L of the flood discharge ditch remain unchanged, when the dam body 2 is V-shaped, the two side lengths of the dam body 2 are L1 and L2 respectively, and the direction of the V-shaped dam body is the same as the water flow direction;

[0035] In this embodiment, similarly, when designing the dam body 2, the side length of the V-shaped dam body is also determined according to the width L of the flood discharge ditch, and the dam body side length L1 = L2 = L is preferably adopted;

[0036] The outflow area S1 of the flood discharge ditch 1 when there is no dam 2 is calculated as: S1 = L × H, and the outflow area of ​​the V-shaped dam is S2 V形 The calculation formula is: (L1+L2)×(Hh), such as Figure 5The figure shows a schematic diagram of the unfolded cross section of the V-shaped dam body;

[0037] Under the condition that the outflow area of ​​drainage ditch 1 remains unchanged, the outflow area of ​​drainage ditch 1 is set to S1 = S2 V形 When the height h of the V-shaped dam is calculated, the formula is: L×H=(L1+L2)×(Hh). Finally, the formula for the height h of the V-shaped dam is obtained: h=H / 2. It can be seen that no matter it is a semicircular or V-shaped dam, the height of the dam calculated by this method is only related to the flood water level H. The relevant personnel only need to build the dam height according to the flood water level H, which reduces the workload of the staff and the collection of relevant data information.

[0038] The dam design method proposed in this invention can solve the problem of setting up a black water interception dam and flood discharge in the flood discharge ditch 1, which is of broad and important significance for the management of black rainwater in mountain mining areas, and can also be applied to river ecological management, landscape waterfall setting, etc.

[0039] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0040] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for designing a dam for black rainwater drainage in a mining area drainage ditch, characterized in that: The following steps are involved: S1: Obtaining historical data of the local mining area, the historical data including the flood water level H and the width L of the flood drainage ditch (1); S2: The dam body (2) is set to be semicircular or V-shaped, and the orientation direction of the semicircular dam body and the V-shaped dam body is the same as the direction of the water flow, and the radius of the semicircular dam body or the side length of the V-shaped dam body is determined according to the width L of the flood discharge ditch (1), wherein the diameter of the semicircular dam is equal to the width L of the flood discharge ditch (1); S3: the outflow area S1 of the flood discharge ditch (1) when the dam body (2) is not provided. The calculation formula of the outflow area S1 is: S1 = L × H. Assuming that the height of the dam body (2) to be determined is h, the outflow area of ​​the flood discharge ditch (1) when the dam body (2) is provided is S2. When the outflow area S1 when the dam body (2) is not provided is the same as the outflow area S2 of the flood discharge ditch (1) when the dam body (2) is provided, it is considered that the installation of the dam body (2) has no effect on the flood discharge capacity of the flood discharge ditch (1); S4: Let S1 = S2. Under the condition that the outflow area of ​​the flood drainage ditch (1) remains unchanged, the height of the dam body (2) can be obtained. The height of the dam body (2) is related to the flood water level H. The dam body is constructed according to the calculated height of the dam body (2).

2. The method for designing a dam for draining black rainwater in a mining area drainage ditch according to claim 1, characterized in that: When the dam body (2) is semicircular, the radius of the dam body (2) is R = L / 2, and the outflow area is S2 半圆 The calculation formula is: S2 半圆 =πR×(Hh); when the outflow area of ​​the flood drainage ditch (1) is S1=S2 半圆 The calculation formula for the height h of the semicircular dam body can be obtained: L×H=πR×(Hh). Finally, the relationship between the height h of the semicircular dam body and the flood water level H is obtained by integration: h=(1-2 / π)×H.

3. The method for designing a dam for draining black rainwater in a mining area drainage ditch according to claim 1, characterized in that: When the dam body (2) is V-shaped, the two sides of the dam body (2) are L1 and L2 respectively. When designing the dam body (2), the side length of the dam body (2) is L1 = L2 = L, and the outflow area is S2 V形 The calculation formula is: (L1+L2)×(Hh); when the outflow area of ​​the flood drainage ditch (1) S1=S2 V形 The calculation formula for the V-type dam height h can be obtained: L×H=(L1+L2)×(Hh). Finally, the relationship between the V-type dam height h and the flood water level H is obtained by integration: h=H / 2.

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