** **

** Reserve calculation method **

** (4) Section method **

** The method is a method for calculating reserves using a survey line profile. According to whether the exploration lines are parallel, it can be divided into two methods: **

** Parallel section method **

** That is, the method of calculating the reserves under the condition that the adjacent two sections are parallel to each other. **

** (1) coal layer control volume between two adjacent cross-section as a block section. **

** The volume of a coal seam controlled between two adjacent sections is equal to the average of the area of â€‹â€‹the coal seam on both sections multiplied by the distance between the two sections, and the volume multiplied by the volume is the reserve. The sum of coal seam reserves between adjacent sections is the total reserves of a certain coal seam. However, some special circumstances should be considered at the edge of the coal seam or at the edge of the exploration area. **

** Figure 2-8-16 Residual ruler **

** First of all, at the edge of the coal seam, sometimes there is only one section control, and the extension is less than the second section. In this case, it should be properly treated according to the characteristics of the coal seam quenching, such as the wedge shape, that is, the area of â€‹â€‹the coal seam on the section multiplied by the distance from the section to the coal seam tipping point, and then multiplied by 2 times Tolerance. **

** Secondly, the boundary of the exploration area is not necessarily the exploration line. In this case, only one section of the coal seam controls the outward extension, but it is not pinched. In this case, proper treatment is given according to the morphological characteristics of the coal seam extending outward. **

** (2) A coal seam with a section of the exploration line and its influence on both sides is used as a block. The storage of the block is equal to one-half of the distance between the cross-sectional area of â€‹â€‹the coal seam on the section and the left and right sections of the section multiplied by the bulk density of the coal. The sum of the reserves of each block is the total reserve. **

** 2. Non-parallel section method **

** When the exploration lines are not parallel to each other, the calculation of reserves using the section method is more complicated. Two simple methods are introduced here. **

** (1) Profile influence distance method. **

** The distance affected by the cross-sectional area of â€‹â€‹the coal seams on two non-parallel exploration lines is different in most cases. Calculating the reserves according to this principle is a feature of the law. Figure 2-8-17 has two exploration lines 1-1 and 11-11, which are not parallel to each other, a _{1} a _{2} Â And b _{1} b _{2} is the intersection of the exploration line and the coal seam boundary line, wherein the points are c _{1} and c _{2 respectively} , and after connecting and extending, the coal seam block between the two exploration lines is divided into two parts. That is, S' _{1} and S' _{2} . Their volumes are: **

** Wherein, V _{1} and V _{2} respectively are c _{1} c _{2} and two parts by volume of the separated coal; S _{1} and S _{2 are} respectively cross-sectional area of the seam cross section 1-1 and 11-11; S _{'1} and S _{'2} are respectively horizontal projection area between c _{1} c _{2} separated by two bottom seam line exploration contour; l _{1} and l _{2} are two exploration lines and a _{1} b _{1} a _{2} b _{2} length. **

** Obviously, S' _{1} /l _{1} and S' _{2} /l _{2} are the influence distances of the coal seam cross-sectional areas S _{1} and S _{2} on the 1-1 and 11-11 exploration line profiles, respectively. With volume, you can find reserves and total reserves. **

** (2) Section impact area method. **

** Figure 2-8-17 Schematic diagram of the calculation of reserves by the section influence distance method **

** As shown in Figure 2-8-18, the two extension lines 1-1 and 11-11 intersect at 0, and the bisector of the angle Î± is connected to the ends 1-5 and 4-7 of the two exploration lines. The coal seam area between the lines is divided into two parts, S _{1} and S _{2} . Consider S _{1} as the area of â€‹â€‹influence of the 1-1 section, and S2 as the area of â€‹â€‹influence of the 11 - 11 section. The reserves of the two sections are: **

** Q _{1} = S _{1} â€¢ Mcp _{1} Â â€¢ dcp _{1} **

** Q _{2} Â = S _{2} Â * Mcp _{1} Â â€¢ dcp _{2} **

** Where Q _{1} and Q _{2} Â The reserves of the coal seams of the 1-1 and 11-11 sections are respectively; S _{1} and S _{2} are the affected areas of the 1-1 and 11-11 sections respectively; McP _{1} and Mcp _{2} are the sections of 1-1 and 11-11l, respectively. The average diameter of the coal is seen for each hole; dcp _{1} and dcp _{2} are the average values â€‹â€‹of the density of the coal holes in each of the 1-1 and 11-11 sections. **

** Figure 2 - 8 - 18 section effect area method **

** There are two main advantages of the section method. One is that the method is simple and has sufficient accuracy, and the other is to save time and effort for the contour map of the coal seam floor. Therefore, it has been widely used in the calculation of coal reserves, especially in the calculation of reserves of various types of thick coal seams with huge changes in coal seam thickness. **

** Figure 2-8-l9 Polygonal method for calculating reserves **

** (a) A part of the calculation plane, with a method of taking a polygon as an example; **

** (b) On the axis projection, the coal seam is divided into mutually adjacent corner cylinders 1 see the coal seams drilled; 2 - no coal boreholes; 3 - calculated polygonal boundaries; 4 - inner boundary lines; 5 - outer edges Boundary **

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