Method and device for drawing minimum overlying rock mass thickness curve of hydraulic pressure tunnel

Abstract

The invention belongs to the technical field of water conservancy and hydropower engineering, and particularly relates to a method for drawing a minimum overlying rock mass thickness curve of a hydraulic pressure tunnel, which comprises the following steps of: drawing an intersection line of a longitudinal section of a tunnel to be excavated and the outer surface of an overlying rock mass, and determining a gentle area and a slope area on the longitudinal section according to the fluctuation degree of the intersection line; points are taken from the intersecting line in the gentle area and the slope area respectively, the minimum overlying rock mass thickness is cut inwards, cut points are obtained, then the adjacent cut points are connected to form a smooth minimum overlying rock mass thickness curve, and the method is suitable for being applied to hydraulic pressure tunnel surrounding rock mountain anti-lift stability evaluation. Based on the same inventive concept, the invention further provides a device for drawing the minimum overlying rock mass thickness curve of the hydraulic pressure tunnel, a non-transient readable recording medium storing a program of the method and a system comprising the medium, and the program can be called through a processing circuit to execute the method.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and discloses a method, device, system and recording medium storing a program capable of executing the method for drawing a minimum overburden rock thickness curve of a hydraulic pressure tunnel. Background Art

[0002] When constructing new water conservancy projects and developing hydropower resources, it is often necessary to dig hydraulic pressure tunnels to achieve functions such as water transmission, water discharge, and water diversion for power generation. Among them, the walls of some tunnels or certain sections of tunnels are subject to a certain amount of internal water pressure. Pressure tunnels are a common type of hydraulic structure in water conservancy and hydropower projects. With the gradual implementation of the national water network planning, large-scale irrigation areas, water diversion and water resource allocation projects across river basins and regions will involve more pressure tunnels.

[0003] The survey and design of pressurized tunnels is more difficult than that of unpressurized tunnels. In addition to all the problems faced by unpressurized tunnels, pressurized tunnels also need to first solve the problem of mountain anti-uplift stability, as the most important part of ensuring the safe operation of pressurized tunnels. Norway was the first country to study this issue, proposing that the minimum overburden thickness of unlined tunnels should not be less than the internal water pressure, while retaining a safety factor of 1.3 to 1.5 to ensure that the surrounding rock mass does not suffer uplift damage under the maximum internal water pressure (Norwegian criteria). Subsequently, Australia proposed the Snow Mountain Criteria for steep terrain, arguing that the horizontal lateral covering rock thickness plays a controlling role when there is a slope terrain with an open face in the horizontal direction of the tunnel, as a supplement to the Norwegian criteria.

[0004] In current practice, survey and design personnel first preliminarily plan the tunnel sections in hydraulic pressure tunnels that may have anti-uplift stability problems based on engineering experience, and then use the Norwegian criterion and the Snow Mountain criterion to calculate the minimum overburden rock thickness for the above-mentioned key tunnel sections. Finally, the anti-uplift stability of the surrounding rock mass is evaluated by comparing the calculated value of the minimum overburden rock thickness with the actual overburden rock thickness at that location. It can be seen that in the evaluation of the anti-uplift stability of the surrounding rock mass of the pressure tunnel, the conventional approach has the shortcomings of incomplete analysis (it is difficult to conduct anti-uplift risk assessment for the entire tunnel), unintuitive judgment (only data, no images), and inaccurate conclusions. It is necessary to invent a method that can overcome the above-mentioned defects and provide a reliable basis for the plan section layout and lining structure selection of hydraulic pressure tunnels. Summary of the invention

[0005] In view of the above problems, the present invention provides a method for drawing a minimum overburden rock thickness curve of a hydraulic pressure tunnel, and the specific scheme includes the following steps:

[0006] S1. Draw the intersection line between the longitudinal section of the proposed tunnel and the outer surface of the overlying rock mass, and determine the gentle area and slope area on the longitudinal section according to the degree of undulation of the intersection line;

[0007] S2. Calculate the thickness of the minimum overlying rock mass, draw multiple plumb lines at preset step lengths in the gentle area, and respectively cut the length of the thickness from the intersection of the plumb line and the intersection line along the plumb line downward to obtain the interception point; draw multiple normal lines perpendicular to the intersection line at preset step lengths in the slope area, and respectively cut the length of the thickness from the intersection of the normal line and the intersection line along the plumb line downward to obtain the interception point;

[0008] S3. Connect adjacent interception points to form a smooth curve, where the smooth curve is a minimum overburden rock thickness curve.

[0009] Preferably, if the outer surface undulation of the overlying rock mass exceeds 1 / 10 of the tunnel clearance every 10 meters, it is a slope area; otherwise, it is a flat area.

[0010] Preferably, for the rock mass that has been weathered and eroded, the easily peeled attached blocks are removed, and the outermost layer of the rock mass that has not been eroded is used as the outer surface of the overlying rock mass.

[0011] Preferably, the formula for calculating the thickness of the minimum overburden is:

[0012] In the formula: h s is the hydrostatic pressure head in the tunnel, which is equal to the difference between the design water level of the water inlet and the elevation of the tunnel axis at the projection line; γ w is the density of water, which is 10 kN / m3; γ r is the weight of the rock; θ is the slope angle, if θ>60 degrees, then take θ=60 degrees; F is the safety factor, which is 1.3~1.5.

[0013] In order to cooperate with the implementation of the above method, the present application also provides a device for drawing a minimum overburden thickness curve of a hydraulic pressure tunnel, comprising the following functional modules:

[0014] The zoning module is used to make the intersection line between the longitudinal section of the planned tunnel and the outer surface of the overlying rock mass, and to determine the flat area and slope area on the longitudinal section according to the degree of undulation of the intersection line;

[0015] The interception module calculates the thickness of the minimum overlying rock mass, draws multiple plumb lines at preset step lengths in the gentle area, and respectively intercepts the length of the thickness from the intersection of the plumb line and the intersection line along the plumb line downward to obtain the interception point; draws multiple normal lines perpendicular to the intersection line at preset step lengths in the slope area, and respectively intercepts the length of the thickness from the intersection of the normal line and the intersection line along the plumb line downward to obtain the interception point;

[0016] The fitting module connects adjacent interception points to form a smooth curve, where the smooth curve is a minimum overburden rock thickness curve.

[0017] Preferably, in the partition module, if the undulation of the outer surface of the overlying rock mass every 10 meters exceeds 1 / 10 of the tunnel clearance, it is a slope area, otherwise it is a flat area.

[0018] Preferably, in the partition module, for the weathered and eroded rock mass, the easily peeled attached blocks are removed, and the outermost layer of the uneroded rock mass is used as the outer surface of the overlying rock mass.

[0019] Preferably, the formula for calculating the thickness of the minimum overburden in the intercept module is:

[0020] In the formula: h s is the hydrostatic pressure head in the tunnel, which is equal to the difference between the design water level of the water inlet and the elevation of the tunnel axis at the projection line; γ w is the density of water, which is 10 kN / m3; γ r is the weight of the rock; θ is the slope angle, if θ>60 degrees, then take θ=60 degrees; F is the safety factor, which is 1.3~1.5.

[0021] Another embodiment of the present invention is to provide a non-transitory readable recording medium for storing one or more programs containing multiple instructions. When the instructions are executed, the processing circuit will execute the above-mentioned method for drawing the minimum overburden thickness curve of the hydraulic pressure tunnel.

[0022] The present invention also provides a system for drawing a minimum overburden thickness curve of a hydraulic pressure tunnel, comprising a processing circuit and a memory electrically coupled thereto, characterized in that the memory is configured to store at least one program, the program comprising a plurality of instructions, and the processing circuit runs the program to execute the above-mentioned method for drawing a minimum overburden thickness curve of a hydraulic pressure tunnel.

[0023] Beneficial effects of the present invention:

[0024] The present invention obtains the inner interception points of the minimum overburden rock thickness in different areas by zoning the tunnel longitudinal section, and then connects the inner interception points with a smooth curve to form a minimum overburden rock thickness curve. It can make an intuitive and clear judgment on whether the tunnel selection makes the outer edge of the tunnel fall into the unstable area. Since the interception points are obtained throughout the excavation direction of the tunnel, the one-sidedness of thickness calculation only for certain special sections is avoided. The information obtained is more credible and accurate. The use of curve fitting saves the number of samples, indirectly saves the amount of calculation, and improves the judgment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the flow of a method for drawing a minimum overburden rock thickness curve of a hydraulic pressure tunnel in an embodiment of the present invention;

[0026] Figure 2 The engineering geological profile diagram containing the minimum overlying rock mass thickness curve of the hydraulic pressure tunnel in the embodiment of the present invention;

[0027] Among them, A-slope shoulder point of the mountain slope; B-turning point of the outer edge line of the tunnel; S-water inlet; E-water outlet; 1-mountain terrain line; 2-outer edge line of the hydraulic pressure tunnel; 3-dividing line between the flat land (tunnel) section and the slope land (tunnel) section; 4-vertical projection line, 5-oblique projection line, 6-weakly weathered top plate line of bedrock, 7-designed water level of the water inlet, 8-minimum overlying rock thickness curve of the hydraulic pressure tunnel. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making innovative efforts are within the scope of protection of the present invention.

[0029] An embodiment of a method for drawing a minimum overburden thickness curve of a hydraulic pressure tunnel comprises the following steps:

[0030] Step 1: Distinguish between the flat ground (tunnel) section and the sloping ground (tunnel) section (i.e. the flat area and the sloping area in the invention); if the outer surface undulation of the overlying rock mass exceeds 1 / 10 of the tunnel clearance every 10 meters, it is a slope area, otherwise it is a flat area.

[0031] like Figure 2 As shown, the line AB connecting the shoulder point A of the mountain slope and the turning point B of the outer edge of the tunnel is the dividing line 3 between the flat land (tunnel) section and the slope land (tunnel) section;

[0032] The mountain and tunnel between the water inlet S of the hydraulic pressure tunnel and the partition line AB are a flat ground (tunnel) section, and the mountain and tunnel between the partition line AB and the water outlet E of the hydraulic pressure tunnel are a sloping ground (tunnel) section.

[0033] Step 2: Project the characteristic points of each location (hole) to form projection lines;

[0034] The characteristic points include the turning point on the mountain terrain line 1 and the turning point on the outer edge line 2 of the hydraulic pressure tunnel;

[0035] In the flat land (tunnel) section, every 20 meters as a step interval, the turning point of the mountain topography line in each interval is vertically projected to the outer edge line of the hydraulic pressure tunnel, and the turning point of the outer edge line of the hydraulic pressure tunnel is vertically projected to the mountain topography line 1 to form a corresponding vertical projection line 4 (i.e., the plumb line in the invention);

[0036] In the slope (tunnel) section, every 20 meters is a step interval, the turning point of the mountain terrain line 1 in each interval is vertically projected to the outer edge line 2 of the hydraulic pressure tunnel, and the turning point of the outer edge line of the hydraulic pressure tunnel is vertically projected to the terrain line to form the corresponding oblique projection line (i.e., the normal line in the invention content);

[0037] For the turning point B of the outer edge line of the tunnel closest to the shoulder of the mountain slope, vertical projections are made to the terrain line of the flat land (tunnel) section and to the terrain line of the slope land (tunnel) section to form corresponding vertical projection lines and oblique projection lines.

[0038] Step 3: determine the minimum overburden rock thickness point on each projection line;

[0039] The intersections of each projection line (vertical projection line, oblique projection line) and the weakly weathered top plate line 6 of the bedrock (i.e., the intersection line of the outermost layer of the uneroded rock mass and the longitudinal section of the tunnel mountain in the content of the invention) are numbered from left to right, and are 0 1 , O 2 ,…,O 12 , where O 1 , O 2 ,…,O 7 is the intersection of the vertical projection line 4 and the weakly weathered top plate line 6 of the bedrock, O 8 , O 9 ,…,O 12 It is the intersection of the oblique projection line 5 and the weakly weathered top plate line 6 of the bedrock;

[0040] On the vertical projection line 4, point O 1 , O 2 ,…,O 7 Cut line segments O downwards for the endpoints 1 D 1 , O 2 D 2 ,…,O 7 D 7 , so that line segment O 1 D 1 , O 2 D 2 ,…,O 7 D 7 The lengths are the minimum overburden thickness C at the projection line. RM , point D 1 , D 2 ,…,D 7 are the minimum overlying rock mass thickness points on each vertical projection line 4 (i.e., the intercept points in the content of the invention);

[0041] On the oblique projection line 5, point O 8 , O 9 ,…,O12 Take line segments O as the endpoints and cut them into the slope 8 D 8 , O 9 D 9 ,…,O 12 D 12 , so that line segment O 8 D 8 , O 9 D 9 ,…,O 12 D 12 The lengths are the minimum overburden thickness C at the projection line. RM , point D 8 , D 9 ,…,D 12 are the minimum overburden rock thickness points on each oblique projection line 5;

[0042] Minimum overburden rock thickness C RM The calculation of is based on the formula specified in the current technical standards, namely In the formula: h s is the hydrostatic pressure head in the tunnel (in meters), which is equal to the difference between the design water level 7 at the water inlet (in meters) and the elevation of the tunnel axis at the projection line (in meters); γ w is the density of water (in kilonewtons / cubic meter), usually 10 kilonewtons / cubic meter; γ r is the weight of the rock (in kilonewtons / cubic meter), which can be determined based on the test results; θ is the slope angle (in degrees), which is the inclination of the tangent line of the topographic line at the oblique projection line. If θ>60 degrees, θ=60 degrees is taken, and θ=0 degrees is taken on the vertical projection line; F is the safety factor, which is generally 1.3-1.5;

[0043] According to the above formula, the calculation results of the minimum overburden rock thickness value at each projection line are as follows:

[0044] O 1 D 1 =O 2 D 2 =O 3 D 3 =O 4 D 4 =O 5 D 5 = 45 meters, where h s =2900-2825=75 meters, γ w =10 kN / m3, F=1.4, γ r =23.3 kN / m3, θ = 0 degrees;

[0045] O 6 D6 = 60 meters, where h s =2900-2800.75=99.25m, γ w =10 kN / m3, F=1.4, γ r =23.3 kN / m3, θ = 0 degrees;

[0046] O 7 D 7 =78 meters, of which h s =2900-2770=130m, γ w =10 kN / m3, F=1.4, γ r =23.3 kN / m3, θ = 0 degrees;

[0047] O 8 D 8 = 156 meters, of which h s =2900-2770=130m, γ w =10 kN / m3, F=1.4, γ r =23.3 kN / m3, θ=60 degrees (the actual slope angle at the projection line θ=68 degrees>60 degrees);

[0048] O 9 D 9 =415 meters, of which h s =2900-2555=345 meters, γ w =10 kN / m3, F=1.4, γ r =23.3 kN / m3, θ=60 degrees (the actual slope angle at the projection line θ=66 degrees>60 degrees);

[0049] O 10 D 10 =415 meters, of which h s =2900-2555=345 meters, γ w =10 kN / m3, F=1.4, γ r =23.3 kN / m3, θ=60 degrees (the actual slope angle at the projection line θ=62 degrees>60 degrees);

[0050] O 11 D 11 = 381 meters, of which h s =2900-2444.19=455.81m, γ w =10 kN / m3, F=1.4, γ r =3.3 kN / m3, θ=44 degrees;

[0051] O 12 D12 = 400 m, of which hs ＝ 2900-2375=525 meters, γ w =10 kN / m3, F=1.4, γ r =23.3 kN / m3, θ=38 degrees.

[0052] Step 4: determine the minimum overlying rock thickness point at the water inlet S and outlet E of the hydraulic pressure tunnel;

[0053] Considering that there is no problem of mountain anti-lift stability caused by internal water pressure in the tunnel below the water inlet design water level 7, the minimum overlying rock thickness point at the water inlet S is located at the intersection D of the water inlet design water level line and the bedrock weakly weathered top plate line 6. 0 , that is, the minimum overlying rock mass thickness here is 0;

[0054] The outlet E is vertically projected, and the vertical projection line 4 intersects with the weakly weathered top plate line 6 of the bedrock at point O. 13 , with point O 13 Cut a line segment O downwards for the endpoint 13 D 13 , so that line segment O 13 D 13 The length is the minimum overburden thickness C at the projection line. RM , point D 13 is the minimum overburden thickness point on the vertical projection line, and the minimum overburden thickness value C RM The calculation still uses the formula in step 3, and the calculation results are as follows:

[0055] O 13 D 13 = 315 meters, of which h s =2900-2375=525m, γ w =10 kN / m3, F=1.4, γ r =23.3 kN / m3, θ=0 degrees.

[0056] Step 5: Use a smooth curve to successively divide the minimum overburden thickness point D 0 , D 1 , D 2 ,…,D 13 Connected together, this curve is the minimum overlying rock thickness curve 8 of the hydraulic pressure tunnel; this curve intersects with the outer edge line 2 of the hydraulic pressure tunnel at point X.

[0057] By using the engineering geological profile containing the minimum overlying rock thickness curve of the hydraulic pressure tunnel, it is possible to intuitively and accurately determine whether the tunnel can meet the mountain uplift stability requirements and the corresponding specific tunnel section location: the tunnel axis of the XE tunnel section is above the minimum overlying rock thickness curve, and this section of the tunnel does not meet the mountain uplift stability requirements; the tunnel axis of the SX tunnel section is below the minimum overlying rock thickness curve, and this section of the tunnel meets the mountain uplift stability requirements.

[0058] The method for drawing the minimum overlying rock thickness curve of a hydraulic pressure tunnel provided by the present invention has been successfully applied in the preliminary geological surveys of many large-scale water conservancy and hydropower projects, such as the Zala Hydropower Station in the Tibet Autonomous Region and the Fangxian Pumped Storage Hydropower Station in Hubei Province.

[0059] A device for drawing a minimum overburden thickness curve of a hydraulic pressure tunnel only uses a virtual module to express the above method, and the basic content remains unchanged, and the embodiments of the device will not be repeated here.

[0060] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computers, available storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program codes.

[0061] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0062] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0063] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0064] Compiling the above method steps into a program and then storing it on a hard disk or other non-transitory storage medium constitutes an embodiment of "a non-transitory readable recording medium" of the present invention; and electrically connecting the storage medium to a computer processor and completing the drawing of the minimum overburden thickness curve of a hydraulic pressure tunnel through data processing constitutes an embodiment of "a system for drawing the minimum overburden thickness curve of a hydraulic pressure tunnel" of the present invention.

[0065] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for drawing a minimum overburden thickness curve for a hydraulic pressure tunnel, characterized in that The following steps are involved: S1. Draw the intersection line between the longitudinal section of the proposed tunnel and the outer surface of the overlying rock mass, and determine the gentle area and slope area on the longitudinal section according to the degree of undulation of the intersection line; S2. Calculate the thickness of the minimum overlying rock mass, draw multiple plumb lines at preset step lengths in the gentle area, and respectively cut the length of the thickness from the intersection of the plumb line and the intersection line along the plumb line downward to obtain the interception point; draw multiple normal lines perpendicular to the intersection line at preset step lengths in the slope area, and respectively cut the length of the thickness from the intersection of the normal line and the intersection line along the plumb line downward to obtain the interception point; S3. Connect adjacent interception points to form a smooth curve, where the smooth curve is a minimum overburden rock thickness curve.

2. The method for drawing a minimum overburden thickness curve of a hydraulic pressure tunnel according to claim 1, characterized in that: If the undulation of the outer surface of the overlying rock mass exceeds 1 / 10 of the tunnel clearance every 10 meters, it is a slope area; otherwise, it is a flat area.

3. The method for drawing a minimum overburden thickness curve of a hydraulic pressure tunnel according to claim 2, characterized in that: For rock mass that has been weathered and eroded, the easily peeled attached blocks are removed and the outermost layer of the uneroded rock mass is used as the outer surface of the overlying rock mass.

4. The method for drawing a minimum overburden thickness curve of a hydraulic pressure tunnel according to claim 3, characterized in that: The formula for calculating the minimum overburden thickness is: In the formula: h s is the hydrostatic pressure head in the tunnel, which is equal to the difference between the design water level of the water inlet and the elevation of the tunnel axis at the projection line; γ w is the density of water, which is 10 kN / m3; γ r is the weight of the rock; θ is the slope angle, if θ>60 degrees, then take θ=60 degrees; F is the safety factor, which is 1.3~1.

5.

5. A device for drawing a minimum overburden thickness curve of a hydraulic pressure tunnel, characterized in that Includes the following functional modules: The zoning module is used to make the intersection line between the longitudinal section of the planned tunnel and the outer surface of the overlying rock mass, and to determine the flat area and slope area on the longitudinal section according to the degree of undulation of the intersection line; The interception module calculates the thickness of the minimum overlying rock mass, draws multiple plumb lines at preset step lengths in the gentle area, and respectively intercepts the length of the thickness from the intersection of the plumb line and the intersection line along the plumb line downward to obtain the interception point; draws multiple normal lines perpendicular to the intersection line at preset step lengths in the slope area, and respectively intercepts the length of the thickness from the intersection of the normal line and the intersection line along the plumb line downward to obtain the interception point; The fitting module connects adjacent interception points to form a smooth curve, where the smooth curve is a minimum overburden rock thickness curve.

6. The device for drawing a minimum overburden thickness curve of a hydraulic pressure tunnel according to claim 5, characterized in that: In the partition module, if the undulation of the outer surface of the overlying rock mass exceeds 1 / 10 of the tunnel clearance every 10 meters, it is a slope area, otherwise it is a flat area.

7. The device for drawing a minimum overburden thickness curve of a hydraulic pressure tunnel according to claim 6, characterized in that: In the zoning module, for the weathered and eroded rock mass, the easily peeled attached blocks are removed, and the outermost layer of the uneroded rock mass is used as the outer surface of the overlying rock mass.

8. The device for drawing a minimum overburden thickness curve of a hydraulic pressure tunnel according to claim 7, characterized in that: The formula for calculating the minimum thickness of the overburden in the intercept module is: In the formula: h s is the hydrostatic pressure head in the tunnel, which is equal to the difference between the design water level of the water inlet and the elevation of the tunnel axis at the projection line; γ w is the density of water, which is 10 kN / m3; γ r is the weight of the rock; θ is the slope angle, if θ>60 degrees, then take θ=60 degrees; F is the safety factor, which is 1.3~1.

5.

9. A non-transitory readable recording medium for storing one or more programs including a plurality of instructions, characterized in that: When the instruction is executed, the processing circuit will be caused to execute the method for drawing a minimum overburden thickness curve of a hydraulic pressure tunnel according to any one of claims 1 to 4.

10. A system for drawing a minimum overburden thickness curve for a hydraulic pressure tunnel, characterized in that It comprises a processing circuit and a memory electrically coupled thereto, characterized in that the memory is configured to store at least one program, the program comprises a plurality of instructions, and the processing circuit runs the program to execute a method for drawing a minimum overburden thickness curve of a hydraulic pressure tunnel as claimed in any one of claims 1 to 4.

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