CN106777655B - Method and device for calculating equivalent mining thickness ratio of coal mine goaf of overhead transmission line - Google Patents

Method and device for calculating equivalent mining thickness ratio of coal mine goaf of overhead transmission line Download PDF

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CN106777655B
CN106777655B CN201611137014.3A CN201611137014A CN106777655B CN 106777655 B CN106777655 B CN 106777655B CN 201611137014 A CN201611137014 A CN 201611137014A CN 106777655 B CN106777655 B CN 106777655B
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goaf
thickness
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soil layer
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马维青
贾志义
赵晓龙
穆昭玺
夏丽
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HUADA TIANYUAN (BEIJING) ELECTRIC POWER TECHNOLOGY CO LTD
State Grid Corp of China SGCC
Yangquan Power Supply Co of State Grid Shanxi Electric Power Co Ltd
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State Grid Corp of China SGCC
Yangquan Power Supply Co of State Grid Shanxi Electric Power Co Ltd
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Abstract

A method and a device for calculating the equivalent mining thickness ratio of a coal mine goaf of an overhead transmission line comprise the following steps: calculating the equivalent thickness of each rock-soil layer above the goaf; equivalent thickness of each layered overlying rock-soil layer

Description

Method and device for calculating equivalent mining thickness ratio of coal mine goaf of overhead transmission line
Technical Field
The invention belongs to the field of disaster prevention design and protection of overhead transmission lines, and relates to a method and a device for calculating an equivalent mining thickness ratio of a coal mine goaf of an overhead transmission line.
Background
The power transmission iron tower is extremely sensitive to earth surface movement deformation caused by mining, the underground coal seam mining can cause the earth surface movement and deformation, and the safety of the high-voltage power transmission line is greatly influenced. However, how to evaluate the influence degree of the surface deformation of the goaf on the newly-built transmission line at the upper part is a difficult problem which is not completely solved at home and abroad.
At present, scholars at home and abroad generally divide the influence degree of the surface deformation by the size of the traditional mining thickness ratio, namely the ratio of the burial depth of a coal seam to the mining thickness of the coal seam, and propose suggestions on whether the construction is suitable or not and structural measures are taken according to the divided grades. However, because the thicknesses and properties of overlying rock-soil layers in different regions are obviously different, the surface deformation degree of the goaf is judged simply by using the ratio of the burial depth of the coal seam to the thickness of the coal seam, and the theoretical basis is lacked. The same value of the mining thickness ratio may correspond to completely different geological conditions, and the severity of actual surface deformation cannot be reflected, even serious judgment errors are caused. Therefore, the influence degree of the goaf surface deformation on the surface power transmission line is evaluated according to the traditional mining thickness ratio, the planning, construction and operation technical scheme of the coal mine goaf overhead power transmission line is determined, and serious potential safety hazards exist.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method and a device for calculating the equivalent mining thickness ratio of the coal mine goaf of the overhead transmission line, the method has the advantages of sufficient theoretical basis, comprehensive consideration and reliable result, can reasonably consider the influence degree of the thickness and the property of an overlying rock-soil layer on the surface deformation, can accurately reflect the severity of the actual surface deformation, can be favorable for evaluating the risk of the surface deformation of the goaf through which the transmission line passes, can be favorable for determining the reasonable planning, construction and operation technical scheme of the overhead transmission line of the coal mine goaf, and has important guiding significance and reference value for ensuring the safety of the transmission line.
In order to achieve the aim, the invention provides a method for calculating the equivalent mining thickness ratio of a coal mine goaf of an overhead transmission line, which comprises the following steps:
the method comprises the following steps: calculating the equivalent thickness of each rock-soil layer above the goaf according to the property and the thickness of the overlying rock-soil layer;
step two: equivalent thickness of each layered overlying rock-soil layer
Figure BDA0001177106640000021
Accumulating and summing to obtain the equivalent total thickness of the overlying rock-soil layer corresponding to the standard medium;
step three: and calculating the equivalent mining thickness ratio of the goaf according to the mining thickness of the coal seam and the equivalent total thickness of the overlying rock-soil layer.
Preferably, the equivalent thickness of each rock-soil layer above the goaf in the step one
Figure BDA0001177106640000022
The calculation formula of (2) is as follows:
Figure BDA0001177106640000023
wherein: qkThe lithology evaluation coefficient of the rock-soil layer selected as the standard medium in the overlying rock-soil layer is obtained;
Qithe lithology evaluation coefficient of the ith rock stratum in the overlying rock stratum is obtained;
hithe thickness of the rock stratum of the ith rock stratum in the overlying rock stratum is shown.
Preferably, the overburden rock soil layer in the second step corresponds to the equivalent total thickness of the standard medium
Figure BDA0001177106640000024
The calculation formula of (2) is as follows:
Figure BDA0001177106640000025
preferably, the equivalent goaf mining thickness ratio in the third step
Figure BDA0001177106640000026
The calculation formula of (2) is as follows:
Figure BDA0001177106640000027
wherein: and B is the thickness of coal seam mining.
Preferably, in the first step, loess in the overlying rock-soil layer is selected as a standard medium, and the lithology evaluation coefficient of the loess is 1.0.
Further comprises a goaf equivalent mining thickness ratio calculated by taking loess as a standard medium
Figure BDA0001177106640000028
Are respectively located at
Figure BDA0001177106640000029
And
Figure BDA00011771066400000210
when the earth surface deformation is within the range of (2), the influence degree of the earth surface deformation on the power transmission line is respectively in three grades of serious, medium and slight.
When the calculation result of the equivalent mining thickness ratio shows that the influence degree of the surface deformation on the power transmission line is serious, the goaf is not required to be constructed with the power transmission line; when the influence degree of the ground surface deformation on the transmission line is moderate, structure and structure anti-deformation measures should be adopted when the transmission line is constructed in the goaf; when the influence degree of the ground surface deformation on the transmission line is slight, no special measures can be taken when the transmission line is constructed in the goaf.
As a preference, the measures taken to make the structure and construction resistant to deformation specifically refer to: and the line patrol frequency is improved, and the online deformation and displacement monitoring of the power transmission line are carried out.
In order to achieve the above object, the present invention further provides a device for calculating an equivalent mining thickness ratio of a coal mine goaf of an overhead transmission line, including:
the equivalent thickness calculation module is used for calculating the equivalent thickness of each rock-soil layer above the goaf according to the property and the thickness of the overlying rock-soil layer;
an equivalent total thickness calculating module for calculating the equivalent thickness of each layered overlying rock-soil layer
Figure BDA0001177106640000031
Accumulating and summing to obtain the equivalent total thickness of the overlying rock-soil layer corresponding to the standard medium;
and the equivalent mining thickness ratio calculating module is used for calculating the equivalent mining thickness ratio of the goaf according to the mining thickness of the coal seam and the equivalent total thickness of the overlying rock-soil layer.
Further, the apparatus further comprises:
an output module for calculating the equivalent goaf mining thickness ratio when loess is used as a standard medium
Figure BDA0001177106640000032
Outputting a conclusion that the goaf is not suitable for constructing the power transmission line; when in use
Figure BDA0001177106640000033
Outputting a conclusion that structural and structural anti-deformation measures are required during the construction of the transmission line of the goaf; when in use
Figure BDA0001177106640000034
And outputting a conclusion that the goaf is suitable for constructing the power transmission line.
Based on geological data of rock strata of the goaf, common loess of the coal mine goaf is used as a standard medium, the lithology evaluation coefficient is used as a conversion basis, the actual thicknesses of different rock-soil layers in the overlying rock-soil layer of the goaf are converted into equivalent thicknesses of the standard medium, then the equivalent thicknesses of the rock-soil layers above the goaf are accumulated and summed to obtain the equivalent total thickness of the overlying rock-soil layer of the goaf, namely the equivalent depth of the mined coal seam, and then the equivalent total thickness of the overlying rock-soil layer is divided by the coal mining thickness, so that the equivalent mining thickness ratio of the goaf is obtained. On the basis, loess is used as a standard medium, and a judgment index for evaluating the ground surface deformation severity of the goaf in the power transmission line way is provided. The calculation method has the advantages of sufficient calculation theoretical basis, comprehensive consideration, reliable result, convenience in use, more fitting of the calculation result to the requirements of engineering design, capability of reasonably considering the influence degree of the thickness and the property of the overlying rock-soil layer on the surface deformation, capability of accurately reflecting the severity of the actual surface deformation, convenience in popularization and application and wide applicability. The method can also be beneficial to evaluating the risk of surface deformation of the goaf through which the power transmission line passes, can be beneficial to determining the reasonable planning, construction and operation technical scheme of the overhead power transmission line in the coal mine goaf, and has important guiding significance and reference value for ensuring the safety of the power transmission line. The device can calculate the mining thickness ratio of the mined-out area of the coal mine quickly and accurately, and can reflect the severity of actual surface deformation.
Detailed Description
The present invention is further described below.
The properties of the overlying geotechnical layer have important influence on the movement and deformation of the earth surface, namely, when the influence of the mining thickness ratio on the stability of the earth surface of the overhead transmission line is considered, the thickness and the properties of the overlying geotechnical layer must be considered. Therefore, the method converts the overlying rock-soil layers with different properties into a certain soil layer or rock layer serving as a standard medium, converts the currently called mining thickness ratio into a uniform mining thickness ratio, namely an equivalent mining thickness ratio, can better reflect the influence degree of the geological conditions of the goaf on the surface deformation, and is used as an important basis for determining the technical scheme of planning, construction and operation of the overhead transmission line.
A method for calculating the equivalent mining thickness ratio of a coal mine goaf of an overhead transmission line comprises the following steps:
the method comprises the following steps: calculating the equivalent thickness of each rock-soil layer above the goaf
Figure BDA0001177106640000041
The calculation formula is as follows:
Figure BDA0001177106640000042
wherein: qkSelecting loess as a standard medium during actual calculation, wherein the lithological evaluation coefficient of the rock-soil layer selected as the standard medium in the overlying rock-soil layer is 1.0;
Qithe lithology evaluation coefficient of the ith rock stratum in the overlying rock stratum is obtained;
hithe thickness of the rock stratum of the ith rock stratum in the overlying rock stratum is m;
Figure BDA0001177106640000043
the equivalent thickness of the i-th rock soil layer in the overlying rock soil layer after being converted into a standard medium is expressed in m;
table 1: evaluation coefficient of layered lithology
Figure BDA0001177106640000051
Step two: equivalent thickness of each layered overlying rock-soil layer
Figure BDA0001177106640000052
And accumulating and summing to obtain the equivalent total thickness of the overlying rock-soil layer corresponding to the standard medium, wherein the calculation formula is as follows:
Figure BDA0001177106640000053
wherein:
Figure BDA0001177106640000054
the equivalent total thickness of the overlying rock-soil layer of the goaf relative to the standard medium is m;
step three: calculating the equivalent mining thickness ratio of the goaf according to the mining thickness of the coal seam and the equivalent total thickness of the overlying rock-soil layer, wherein the calculation formula is as follows:
Figure BDA0001177106640000055
wherein:
Figure BDA0001177106640000056
the equivalent mining thickness ratio of the goaf is obtained;
and B is the thickness of the coal seam, and the unit is m.
Goaf equivalent mining thickness ratio calculated by taking loess as standard medium
Figure BDA0001177106640000057
Are respectively located at
Figure BDA0001177106640000058
Figure BDA0001177106640000059
And
Figure BDA00011771066400000510
when the earth surface deformation is within the range of (2), the influence degree of the earth surface deformation on the power transmission line is respectively in three grades of serious, medium and slight.
When the calculation result of the equivalent mining thickness ratio shows that the influence degree of the surface deformation on the power transmission line is serious, the goaf is not required to be constructed with the power transmission line; when the influence degree of the surface deformation on the transmission line is moderate, necessary structure and structure anti-deformation measures are required to be adopted when the transmission line is constructed in the goaf, the line patrol frequency is improved, and the online deformation and displacement monitoring of the transmission line is required to be carried out conditionally; when the influence degree of the ground surface deformation on the transmission line is slight, no special measures can be taken when the transmission line is constructed in the goaf.
The invention provides a method for calculating the equivalent mining thickness ratio, which can reasonably consider the influence degree of the thickness and the property of the overlying rock-soil layer on the surface deformation, and can evaluate the risk of the surface deformation of the goaf through which the power transmission line passes so as to determine the technical scheme of planning, construction and operation of the overhead power transmission line, thereby having important guiding significance and reference value for ensuring the safety of the power transmission line.
The following description will be made of specific operation steps of the calculation method according to the present invention with reference to specific examples:
example 1: the basic occurrence of the overlying rock-soil layer of the coal face of a certain goaf is shown in table 1, and the thickness of the mined coal bed is 11.0 m. At present, the influence degree on the power transmission line is evaluated by calculating the equivalent mining-thickness ratio at the position, and a suggestion whether the line can be built at the position is provided.
Table 2: parameters of each layer of overlying rock-soil layer
Figure BDA0001177106640000061
1. Calculating the equivalent thickness of each rock-soil layer above the goaf
Figure BDA0001177106640000062
And converting the actual thickness of each rock-soil layer of the overlying rock-soil layer into the equivalent thickness corresponding to the standard medium by taking loess as the standard medium.
Substituting the actual thickness and lithology coefficient parameters of each layer in the table 2 into the formula
Figure BDA0001177106640000063
Calculating to obtain the equivalent thickness of each layer
Figure BDA0001177106640000071
As shown in table 3.
2. Calculating equivalent total thickness of overlying rock-soil layer
Figure BDA0001177106640000072
Accumulating the obtained equivalent thickness of each layer from the earth surface downwards layer by layer according to the formula
Figure BDA0001177106640000073
Calculating the cumulative equivalent total thickness of all rock and soil layers above the goaf
Figure BDA0001177106640000074
As shown in table 3.
As can be seen from Table 3, the actual total thickness of the overlying rock-soil layer of the goaf at this position is 333.5m, while the equivalent total thickness corresponding to the standard medium loess is 401.8 m.
Table 3: equivalent thickness of loess in each layer
Figure BDA0001177106640000075
3. Calculating the equivalent mining thickness ratio of the goaf
Figure BDA0001177106640000076
According to the method of the present invention, the formula
Figure BDA0001177106640000077
Calculating the equivalent mining thickness ratio of the goaf at the position
Figure BDA0001177106640000078
Correspondingly, if the traditional calculation method is used, the goaf is calculated according to the actual thickness of each rock-soil layer to obtain the mining thickness ratio
Figure BDA0001177106640000079
The safety range of the transmission line allowed to be built is exceeded.
4. Evaluating the influence degree of the surface deformation of the goaf on the power transmission line
From the above calculation results, according to the calculation method of the present invention, the equivalent thickness ratio is 35.6, which is in the range between 35 and 120. According to the judgment, the ground surface deformation belongs to a common influence degree, and a power transmission tower can be built at the place, but necessary deformation-resistant structures and technical measures are required to be taken.
The calculation of the above calculation example shows that by adopting the related calculation method of the invention, the goaf goa. Particularly, various rock-soil layers are simplified into a standard medium, comprehensive comparison analysis of relevant surface subsidence observation data of the goaf in different regions and under different geological conditions and comparison, summarization and popularization and application of relevant power transmission line planning, design and operation experiences are facilitated, the problem that many experiences in the existing goaf line design are difficult to rise to the unified technical standard is solved, the scientific and technical level of planning, design and operation of the goaf power transmission line is improved, and an effective research and analysis means and method are provided.
The applicant establishes a large number of subsidence analysis models of typical goaf rock-soil bodies by adopting F L AC 3D finite element software, and analyzes main ground surface deformation indexes such as a subsidence value, a subsidence rate, an inclination value and the like expressed after the underground coal seam is mined
Figure BDA0001177106640000081
When the equivalent mining thickness ratio is less than 35, the surface deformation is severe and belongs to a dangerous section, and a power transmission iron tower is prevented from being built at the dangerous section; when equivalent mining thickness ratio of overburden
Figure BDA0001177106640000082
When the equivalent mining thickness ratio is larger than 120, the deformation degree of the ground surface above the goaf is very small, and the ground surface near the boundary of the goaf area has no obvious adverse ground surface deformation, which shows that when the equivalent mining thickness ratio is larger than 120, the ground surface deformation of the goaf does not cause serious influence on the safety of the power transmission iron tower, and the power transmission iron tower can be normally constructed; when equivalent mining thickness ratio of overburden
Figure BDA0001177106640000083
When the goaf is in use, certain deformation such as subsidence and inclination occurs, but the deformation of the earth surface presents good continuity, the subsidence rate is small, and the earth surface around the goaf is subjected to shadowThe sound is very small, no stepped sudden ground surface damage occurs, at the moment, the adverse effects on the iron tower caused by ground surface cracking, ground surface sinking and ground surface inclination can be effectively solved only by taking certain measures, such as the arrangement of a bottom composite protective plate foundation, the arrangement of lengthened foundation bolts, the matched correction and righting measures and the like, and therefore, when the equivalent mining thickness ratio of the overlying strata is higher than the equivalent mining thickness ratio of the overlying strata
Figure BDA0001177106640000084
In the process, the power transmission line is feasible to erect above the goaf, but matched structures and technical measures should be made in combination with specific terrain conditions, so that the safety of the power transmission iron tower is further improved.
Based on the same invention concept, the invention also provides a device for calculating the equivalent mining thickness ratio of the coal mine goaf of the overhead transmission line, which comprises the following steps:
the equivalent thickness calculation module is used for calculating the equivalent thickness of each rock-soil layer above the goaf according to the property and the thickness of the overlying rock-soil layer;
an equivalent total thickness calculating module for calculating the equivalent thickness of each layered overlying rock-soil layer
Figure BDA0001177106640000091
Accumulating and summing to obtain the equivalent total thickness of the overlying rock-soil layer corresponding to the standard medium;
and the equivalent mining thickness ratio calculating module is used for calculating the equivalent mining thickness ratio of the goaf according to the mining thickness of the coal seam and the equivalent total thickness of the overlying rock-soil layer.
Further, the apparatus may further include:
an output module for calculating the equivalent goaf mining thickness ratio when loess is used as a standard medium
Figure BDA0001177106640000092
Outputting a conclusion that the goaf is not suitable for constructing the power transmission line; when in use
Figure BDA0001177106640000093
Then the goaf conveying is outputStructure and structure anti-deformation measures need to be taken when the electric line is built; when in use
Figure BDA0001177106640000094
And outputting a conclusion that the goaf is suitable for constructing the power transmission line.
The device can calculate the mining thickness ratio of the mined-out area of the coal mine quickly and accurately, and can reflect the severity of actual surface deformation.
The taking of measures against structural and constructional deformation may specifically include: and the line patrol frequency is improved, and the online deformation and displacement monitoring of the power transmission line are carried out.
The method is based on the geological data of the rock stratum of the goaf, the actual thicknesses of different rock-soil layers in the overlying rock-soil layer of the goaf are converted into equivalent thicknesses of standard media, then the equivalent thicknesses of the rock-soil layers above the goaf are accumulated and summed to obtain the equivalent total thickness of the overlying rock-soil layer of the goaf, namely the equivalent depth of a mining coal seam, and then the equivalent total thickness of the overlying rock-soil layer is divided by the coal mining thickness, so that the equivalent mining thickness ratio of the goaf is obtained. On the basis, a judgment index for evaluating the ground surface deformation severity of the goaf in the power transmission line way is provided. By adopting the scheme provided by the invention, the influence degree of the thickness and the property of the overlying rock-soil layer on the earth surface deformation can be reasonably considered, the severity of the actual earth surface deformation can be accurately reflected, the popularization and the application are convenient, and the applicability is wide. Moreover, the method is beneficial to evaluating the risk of surface deformation of the goaf through which the power transmission line passes, is beneficial to determining the reasonable planning, construction and operation technical scheme of the overhead power transmission line in the coal mine goaf, and has important guiding significance and reference value for ensuring the safety of the power transmission line.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (6)

1. A method for calculating the equivalent mining thickness ratio of a coal mine goaf of an overhead transmission line is characterized by comprising the following steps:
the method comprises the following steps: calculating the equivalent thickness of each rock-soil layer above the goaf according to the property and the thickness of the overlying rock-soil layer;
equivalent thickness of each rock-soil layer above goaf
Figure FDA0002519134500000011
The calculation formula of (2) is as follows:
Figure FDA0002519134500000012
wherein: qkThe lithology evaluation coefficient of the rock-soil layer selected as the standard medium in the overlying rock-soil layer is obtained; selecting loess as a standard medium, wherein the lithology evaluation coefficient of the loess is 1.0;
Qithe lithology evaluation coefficient of the ith rock stratum in the overlying rock stratum is obtained;
hithe thickness of the rock stratum of the ith rock stratum in the overlying rock stratum is determined;
step two: equivalent thickness of each layered overlying rock-soil layer
Figure FDA0002519134500000013
Accumulating and summing to obtain the equivalent total thickness of the overlying rock-soil layer corresponding to the standard medium;
equivalent total thickness of overlying rock-soil layer corresponding to standard medium
Figure FDA0002519134500000014
The calculation formula of (2) is as follows:
Figure FDA0002519134500000015
step three: calculating the equivalent mining thickness ratio of the goaf according to the mining thickness of the coal seam and the equivalent total thickness of the overlying rock-soil layer;
equivalent mining thickness ratio of goaf
Figure FDA0002519134500000016
The calculation formula of (2) is as follows:
Figure FDA0002519134500000017
wherein: and B is the thickness of coal seam mining.
2. The method for calculating the equivalent mining thickness ratio of the coal mine goaf of the overhead transmission line according to claim 1, characterized by further comprising: goaf equivalent mining thickness ratio calculated by taking loess as standard medium
Figure FDA0002519134500000018
Are respectively located at
Figure FDA0002519134500000019
Figure FDA00025191345000000110
And
Figure FDA00025191345000000111
when the earth surface deformation is within the range of (2), the influence degree of the earth surface deformation on the power transmission line is respectively in three grades of serious, medium and slight.
3. The method for calculating the equivalent mining thickness ratio of the coal mine goaf of the overhead transmission line according to claim 2, wherein when the calculation result of the equivalent mining thickness ratio shows that the influence degree of the surface deformation on the transmission line is serious, the goaf should not be constructed with the transmission line; when the influence degree of the ground surface deformation on the transmission line is moderate, structural and structural anti-deformation measures are required when the transmission line is constructed in the goaf; when the influence degree of the ground surface deformation on the transmission line is slight, no special measures are needed when the transmission line is built in the goaf.
4. The method for calculating the equivalent mining thickness ratio of the coal mine goaf of the overhead transmission line according to claim 3, wherein the taking of the measures of structure and structure deformation resistance specifically refers to: and the line patrol frequency is improved, and the online deformation and displacement monitoring of the power transmission line are carried out.
5. The utility model provides a computing device of overhead transmission line coal mine goaf equivalent mining thickness ratio which characterized in that includes:
the equivalent thickness calculation module is used for calculating the equivalent thickness of each rock-soil layer above the goaf according to the properties and the thickness of the overlying rock-soil layer and selecting loess with a lithology evaluation coefficient of 1.0 as a standard medium;
equivalent thickness of each rock-soil layer
Figure FDA0002519134500000021
The calculation formula of (2) is as follows:
Figure FDA0002519134500000022
wherein: qkThe lithology evaluation coefficient of the rock-soil layer selected as the standard medium in the overlying rock-soil layer is obtained; selecting loess as a standard medium, wherein the lithology evaluation coefficient of the loess is 1.0;
Qithe lithology evaluation coefficient of the ith rock stratum in the overlying rock stratum is obtained;
hithe thickness of the rock stratum of the ith rock stratum in the overlying rock stratum is determined;
an equivalent total thickness calculating module for calculating the equivalent thickness of each layered overlying rock-soil layer
Figure FDA0002519134500000023
Accumulating and summing to obtain the equivalent total thickness of the overlying rock-soil layer corresponding to the standard medium;
equivalent total thickness of overlying rock-soil layer corresponding to standard medium
Figure FDA0002519134500000024
The calculation formula of (2) is as follows:
Figure FDA0002519134500000025
the equivalent mining thickness ratio calculating module is used for calculating the equivalent mining thickness ratio of the goaf according to the mining thickness of the coal seam and the equivalent total thickness of the overlying rock-soil layer;
equivalent mining thickness ratio of goaf
Figure FDA0002519134500000026
The calculation formula of (2) is as follows:
Figure FDA0002519134500000027
wherein: and B is the thickness of coal seam mining.
6. The device for calculating the equivalent mining thickness ratio of the goaf of the overhead transmission line coal mine according to claim 5, characterized by further comprising:
an output module for calculating the equivalent goaf mining thickness ratio when loess is used as a standard medium
Figure FDA0002519134500000028
Outputting a conclusion that the goaf is not suitable for constructing the power transmission line; when in use
Figure FDA0002519134500000029
Outputting a conclusion that structural and structural anti-deformation measures are required during the construction of the transmission line of the goaf; when in use
Figure FDA0002519134500000031
And outputting a conclusion that the goaf is suitable for constructing the power transmission line.
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