Method for evaluating ground in front of tunnel face, system for evaluating ground in front of tunnel face, and program for processing drilling data

Abstract

To enable appropriate ground evaluation and to compare ground evaluations using rock drills from multiple manufacturers using the same evaluation index.SOLUTION: A method for evaluating ground in front of a tunnel face includes a valid data extraction step of extracting valid data that meets a preset data extraction standard from drilling data of a rock drilling machine 1, and a rock strength estimation step of estimating rock strength based on the valid data. When there are multiple rock drilling machines 1, the method includes a commonization step of commonizing the drilling data obtained from the multiple rock drilling machines 1.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a method for evaluating the ground ahead of a tunnel face, a system for evaluating the ground ahead of a tunnel face, and a drilling data processing program. [Background technology]

[0002] In mountain tunnel construction, rock drilling machines called drill jumbos are used for blasting excavation. In recent years, computerized drill jumbos, commonly known as computer jumbos, have come to be used, which can determine the drilling position automatically or manually and drill by automatically controlling the drilling speed and drill rotation pressure. With the spread of such rock drilling machines, development of a system to evaluate the face and the surrounding ground is underway using machine data obtained during drilling, such as the drilling speed and rotary drill pressure, as well as face evaluation indexes calculated from the machine data. Conventionally, known techniques for evaluating natural ground using drilling data include those disclosed in, for example, Patent Documents 1 to 4. Patent Documents 1 to 3 describe face evaluation methods that calculate and use face evaluation indexes called drilling volume specific energy or fracture energy coefficient from drilling data obtained by a rock drill. Patent Document 4 describes a face evaluation method that uses a face evaluation index called a normalized drilling speed ratio calculated from drilling data of a rock drill machine. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5867957 [Patent Document 2] Patent No. 4421146 [Patent Document 3] JP 2022-61417 A [Patent Document 4] JP 2022-174364 A Summary of the Invention [Problem to be solved by the invention]

[0004] The face evaluation methods of Patent Documents 1 to 4 can calculate and obtain face evaluation indexes such as drilling volume specific energy, fracture energy coefficient, and normalized drilling speed ratio from the drilling data of a rock drill machine. However, the face evaluation methods of Patent Documents 1 to 4 cannot obtain the strength properties in front of the tunnel face, and therefore cannot properly evaluate the natural ground. Therefore, there is a problem that it is necessary to separately grasp the relationship between these face evaluation indexes and the strength properties to evaluate the natural ground. In addition, the face evaluation index obtained from the drilling data of the rock drill differed depending on the rock drill manufacturer. Therefore, when drilling holes using rock drills from different manufacturers, it was difficult to compare the two using the same face evaluation index, for example, to use it for support design or calculation of blasting charge. In other words, a quantitative face evaluation index that was common to all rock drill manufacturers and associated with strength properties was needed. The present invention aims to solve the above-mentioned problems, and to propose a ground evaluation method ahead of a tunnel face, a ground evaluation system ahead of a tunnel face, and a drilling data processing program that can perform appropriate ground evaluation and compare ground evaluations performed by rock drills from multiple manufacturers using the same evaluation index. [Means for solving the problem]

[0005] The method for evaluating the ground ahead of a tunnel face of the present invention for solving the above-mentioned problems is a method for evaluating the ground ahead of a tunnel face, characterized in that it includes a valid data extraction process for extracting valid data that meets predetermined data extraction criteria from the drilling data of a rock drill machine, and a rock strength estimation process for estimating rock strength based on the valid data. In the present invention, effective data that is effective for understanding rock strength can be extracted from the drilling data obtained from a rock drill machine and used to perform natural ground evaluation, thereby enabling cost reduction through optimal blasting design. Furthermore, by taking into account the control characteristics of a plurality of rock drills, for example rock drills with different specifications from each manufacturer, and extracting data that is effective for understanding rock strength, the accuracy of the evaluation results can be improved. It is preferable that the method for evaluating the natural ground ahead of a tunnel face includes, when a plurality of rock drills are used, a commonization step of commonizing the drilling data acquired from each of the plurality of rock drills. In this configuration, the evaluation of the ground in front of the tunnel face by multiple rock drills can be compared using the same evaluation index, which improves the accuracy of the evaluation results. In addition, even if the drilling data of rock drills is saved in multiple files in different formats for each manufacturer, the drilling data can be centrally managed by standardizing it. In the rock strength estimation step, it is preferable to estimate the rock strength ahead of the tunnel face from the drilling speed of the rock drill machine, based on a relationship between the drilling speed and compressive strength determined in advance using a test specimen. In this configuration, the rock strength can be estimated based on a predetermined relationship using a test specimen, which improves the accuracy of the rock drill evaluation results. Similarly, the accuracy of the evaluation results of the ground in front of the tunnel face using multiple rock drills can be improved.

[0006] The drilling data is data on at least the drilling speed, impact pressure, feed pressure and rotation pressure. In the valid data extraction process, it is preferable to set an extraction exclusion section within the length of the hole drilled by the rock drill machine, from which the drilling data is not extracted. It is preferable that the extraction exclusion section includes a section before the main drilling, which is a section prior to the main drilling, and a drilling control section, which is a section in the section where the main drilling is performed, in which the drilling data does not satisfy the preset data extraction criteria. In this configuration, the drilling data of the section suitable for evaluating the natural ground properties can be extracted to perform natural ground evaluation, which leads to cost reduction through optimal blasting design and improved accuracy of evaluation results. The drilling control section is preferably a section in which the feed pressure of the drilling data does not satisfy a preset data extraction criterion. Sections where the feed pressure of the drilling data does not meet the preset data extraction criteria are sections that are likely to be unsuitable for grasping rock strength, so by excluding these sections, the accuracy of the evaluation results can be improved. In the rock strength estimation process, when the rotational pressure of the drilling data exceeds a predetermined threshold, it is preferable to set a specified section to include the part that exceeds the threshold, and to estimate that the specified section is a soft rock with low rock strength. With this configuration, it is possible to easily estimate that the rock mass is soft based on the rotational pressure in the drilling data, thereby improving the accuracy of the evaluation results.

[0007] The present invention provides a system for evaluating natural ground ahead of a tunnel face to solve the above problems, comprising a rock drill and a management terminal device for processing drilling data acquired from the rock drill. The management terminal device comprises a reading means for reading the drilling data acquired from the rock drill, a valid data extraction means for extracting valid data from the drilling data, and a rock strength estimation means for estimating rock strength based on the valid data. In the present invention, effective data that is effective for understanding rock strength can be extracted from the drilling data obtained from a rock drill machine and used to perform natural ground evaluation, thereby enabling cost reduction through optimal blasting design. Furthermore, by taking into account the control characteristics of a plurality of rock drills, for example rock drills with different specifications from each manufacturer, and extracting data that is effective for understanding rock strength, the accuracy of the evaluation results can be improved. It is preferable that, when there are multiple rock drills, the management terminal device is provided with a conversion means for converting the drilling data acquired from each of the multiple rock drills into a common format. In this configuration, the evaluation of the ground in front of the tunnel face by multiple rock drills can be compared using the same evaluation index, which improves the accuracy of the evaluation results. In addition, even if the drilling data of rock drills is saved in multiple files in different formats for each manufacturer, the drilling data can be centrally managed by standardizing it. The management terminal device preferably includes a visualization means for spatially interpolating the rock strength. With this configuration, it is possible to perform a ground evaluation in front of the tunnel face based on the spatially interpolated rock strength, thereby improving the accuracy of the evaluation results.

[0008] The drilling data processing program of the present invention for solving the above-mentioned problem is for processing drilling data obtained from a rock drilling machine, and causes a computer to execute a process of reading the drilling data obtained from the rock drilling machine, a conversion process of converting the drilling data into a common format, a valid data extraction process of extracting valid data from the drilling data, and a rock strength estimation process of estimating rock strength based on the valid data. In the present invention, effective data that is effective for understanding rock strength can be extracted from the drilling data obtained from a rock drill machine and used to perform natural ground evaluation, thereby enabling cost reduction through optimal blasting design. Furthermore, by taking into account the control characteristics of a plurality of rock drills, for example rock drills with different specifications from each manufacturer, and extracting data that is effective for understanding rock strength, the accuracy of the evaluation results can be improved. Effect of the Invention

[0009] The ground evaluation method ahead of a tunnel face, the ground evaluation system ahead of a tunnel face, and the drilling data processing program of the present invention make it possible to perform appropriate ground evaluation, and to compare ground evaluations made by rock drills from multiple manufacturers using the same evaluation index. [Brief description of the drawings]

[0010] [Figure 1] This is a schematic diagram showing an example of the system configuration of a method for evaluating the ground in front of a tunnel face, a system for evaluating the ground in front of a tunnel face, and a drilling data processing program according to one embodiment of the present invention. [Diagram 2] FIG. 1 is an explanatory diagram showing the process of drilling a hole using a rock drill. [Diagram 3] FIG. 2 is an explanatory diagram showing an image of the operation of the drifter and drilling rod of a rock drill machine. [Figure 4]FIG. 1 is an explanatory diagram showing a common format based on drilling data for each drilling machine manufacturer. [Diagram 5] FIG. 13 is an explanatory diagram for explaining a method for extracting valid data taking into account the mechanical characteristics of a rock drill. [Figure 6] 1 is a graph showing the relationship between drilling speed and compressive strength. [Figure 7] FIG. 1 shows the distribution of rock strength, where (a) is an explanatory diagram showing the drilling locations, and (b) is an explanatory diagram showing the rock strength distribution from drilling data based on the drilling locations. [Figure 8] 13 is a flowchart showing the procedure for processing hole drilling data. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The method for evaluating the natural ground in front of a tunnel face, the system for evaluating the natural ground in front of a tunnel face, and the drilling data processing program of the present invention will be described in detail below with reference to the drawings as appropriate. The following technology is effective when a computer jumbo is used as a rock drill to drill holes for blasting (hereinafter referred to as "blasting holes") for loading explosives into rocks or the like in tunnel excavation work using a blasting method. The drilling data is data on the hole number, date, time, boom number, etc. as hole information, and data on the position coordinates (X, Y, Z) and angles (horizontal insertion angle, vertical insertion angle, etc.) as position information. The drilling data is data on the drilling speed, impact pressure, feed pressure, rotation pressure, damper pressure, etc. as machine data, and data on the excavation energy, etc. as a face evaluation index. The machine data is physical data related to the speed, rotation speed, operating pressure (pressure), etc. obtained from the rock drill. Below, we will explain the case where valid data that meets preset data extraction criteria is extracted from the drilling data of multiple rock drills, and rock strength is estimated from the valid data, but this is not intended to limit the case to when there are multiple rock drills. 1 is a schematic diagram showing an example of a system configuration of a natural ground evaluation system 100 ahead of a tunnel face (hereinafter referred to as the "natural ground evaluation system") according to an embodiment of the present invention. The natural ground evaluation system 100 includes a rock drill 1 and a management terminal device 10. First, the rock drill 1 will be described.

[0012] Fig. 2 is an explanatory diagram showing the rock drill 1 and the state of drilling a hole by the rock drill 1. Fig. 3 is an explanatory diagram showing an image of the operation of the drifter 5 and the drilling rod 6 of the rock drill 1. As shown in FIG. 2, the rock drill 1 is called a computer jumbo and mainly comprises a cart 2 and multiple booms 3. Each boom 3 is provided with a guide shell 4, a drifter 5, and a drilling rod 6. The cart 2 can travel by wheels 2a, and is provided with a drive source, an operating device (operator operation room), and the like. The boom 3 is provided at the front of the cart 2, and is provided in front of the cart 2 so as to be rotatable in any direction and to be freely extended and retractable. The guide shell 4 is attached to the tip of the boom 3. The drifter 5 is a hydraulic impact device and is disposed at the rear of the guide shell 4. The drifter 5 is configured to advance and retreat while being guided by the guide shell 4. The drilling rod 6 is a rod-shaped member for drilling a rock G, and is attached to the drifter 5 and configured to move on the guide shell 4 while maintaining a state parallel to the central axis direction of the guide shell 4. A bit 7 (see FIG. 2) for drilling the rock G is provided at the tip of the drilling rod 6.

[0013] As shown in FIG. 3, the drifter 5 has a hydraulically driven piston 5a inside. When the piston 5a of the drifter 5 strikes the rear end of the drilling rod 6, an elastic stress wave is generated, which propagates through the drilling rod 6 and reaches the bit 7 to crush the rock G. A feed pressure is applied to the drifter 5 so that the front of the bit 7 abuts against the rock G and so that the energy of the stress wave is efficiently transmitted to the rock G. Rotation is applied to the drilling rod 6 via the spline portion 6a to maintain high crushing efficiency. During drilling, water W is pumped into the drilling rod 6 and the bit 7, and cuttings in the blast hole H are discharged. The guide shell 4 and the drifter 5 are fitted with various sensors for detecting the drilling speed V (m / min), the impact pressure N (MPa) of the drifter 5, the feed pressure P (MPa), and the rotational pressure M (MPa) of the drilling rod 6 during drilling. The data detected by each sensor is input to a memory device 8 mounted on the rock drill 1 via, for example, an input I / F (interface) not shown. Other data input to the memory device 8 include start and end coordinates as position information of the rock drill 1, the insertion angle and insertion angle direction of the drilling rod 6, and further data such as the hardness of the rock mass G and the frequency of cracks in the rock mass G as a face evaluation index.

[0014] As shown in Fig. 1, the management terminal device 10 includes a reading means 11, a conversion means 12, a valid data extraction means 13, a rock strength estimation means 14, and a visualization means 15. The management terminal device 10 is a terminal used by an operator, such as a tablet or notebook computer. The management terminal device 10 is installed at the excavation work site of the tunnel T, a site office, or even in a remote office. The reading means 11 reads the drilling data acquired by the rock drilling machine 1 using a reading process program for reading drilling data. The drilling data acquired by the rock drilling machine 1 can be easily read into the management terminal device 10 via a well-known communication means or a memory storage such as a USB memory. The drilling data is automatically acquired by the rock drilling machine 1, and includes data stored in a server via a terminal device at the excavation work site of the tunnel T or at a site office, etc., and data synchronized with a cloud on the web. Here, the drilling data of the rock drilling machine 1 is composed of a single file or multiple files in different formats for each manufacturer (e.g., Company A to Company C, the same below) of the rock drilling machine 1, as shown in Fig. 4. The reading means 11 is capable of reading the drilling data in different formats.

[0015] The conversion means 12 plays a role in converting drilling data, which differs for each manufacturer of the rock drilling machine 1, into drilling data in a common format using a conversion processing program that converts drilling data (standardization process). In other words, the conversion means 12 plays a role in integrating drilling data consisting of a single file or multiple files in the file format of each manufacturer into one file and converting it into a common file format, making it easier to centrally manage, analyze, and utilize. For this purpose, the conversion means 12 is configured to determine the items to be saved in the file and convert it into a common file format, as shown in Figure 4. Specifically, the conversion means 12 unifies the start and end coordinates (relative coordinates, absolute coordinates) as position information for each manufacturer into absolute coordinates. If the drilling data of the rock drilling machine 1 does not have absolute coordinates, the absolute coordinates are found by calculation. In this case, the absolute coordinates can be found by adding the absolute coordinates of the measuring device origin to the product of a rotation matrix that converts relative coordinates into absolute coordinates and the relative coordinates of the drilling start and end (relative coordinates from the measuring device origin). In addition, when the units of the drilling speed V (m / min), the impact pressure N (MPa) of the drilling rod 5, the feed pressure P (MPa), and the rotational pressure M (MPa) of the drilling rod 6 as machine data for each manufacturer are different, the conversion means 12 converts the data into a pre-set common unit. The conversion means 12 is configured to convert the original data of each manufacturer as well as the rock strength calculated from the drilling speed described later into a common file format. The drilling data converted by the conversion means 12 is stored in a storage device (not shown).

[0016] The valid data extraction means 13 extracts valid data that satisfies a preset data extraction criterion from the drilling data converted into the common format by the conversion means 12, using a valid data extraction processing program (valid data extraction step). The valid data that satisfies the data extraction criterion is extracted as data associated with the drilling speed (m / min). FIG. 5 is an explanatory diagram for explaining a method of extracting valid data that takes into account the mechanical characteristics of the rock drill 1. FIG. 5 shows the mechanical characteristics of the rock drill 1 of Company A as an example of a method of extracting valid data. In FIG. 5, the horizontal axis indicates the drilling length (m) of the blast hole H, and the vertical axis indicates the magnitude of the impact pressure (MPa), rotation pressure (MPa), and feed pressure (MPa). In Company A's rock drill 1, the rotation pressure is controlled so as to be maintained at a constant value set within a predetermined range. In addition, Company A's rock drill 1 has the following three controls (1) to (3) that cause the feed pressure, etc. to change significantly. Since drilling transitions from the pre-main drilling stage to the main drilling stage, as shown in Figure 5, the drilling length L1 of blast hole H was divided into two sections: section L2 before main drilling, which is the stage before main drilling, and section L3 of main drilling. For example, if the total drilling length L1 is 1 to 2 m, the drilling length of section L2 before main drilling is, for example, 0.6 m. In section L2 before main drilling, the values ​​of impact pressure, rotation pressure, and feed pressure are all lower than in the main drilling stage. Section L2 before main drilling is defined as the "section that does not meet the data extraction criteria."

[0017] In the rock drilling machine 1 of Company A, when the feed pressure exceeds a preset control threshold K1 (white arrow A in the figure) in the section L2 before the actual drilling, control (1) is set to increase the impact pressure of the drifter 5 (see FIG. 3, the same below). On the other hand, when the feed pressure falls below the control threshold K1 (white arrow B in the figure) in the section L3 of the actual drilling, control (1) is set to decrease the impact pressure. These controls (1) are performed in conjunction with the magnitude of the feed pressure to prevent blank strikes. In addition, in section L3 of this drilling, when the rotation pressure exceeds the control threshold K2 (white arrow C in the figure), control (2) is set to lower the feed pressure. This control is to lower the feed pressure when the rotation pressure increases in order to prevent hole clogging due to drilling mud. In addition, in section L3 of this hole drilling, when the rotational pressure exceeds the control threshold K2 and then exceeds the control threshold K3 (white arrow D in the figure), control (3) is set to lower the feed pressure. This control is an anti-jamming control, and when the rotational pressure increases, the rock drill 1 (rod 3, see Figure 2) is retreated.

[0018] The valid data extraction means 13 sets an extraction exclusion section from which no drilling data is extracted within the drilling length L1 drilled by the rock drilling machine 1. The valid data extraction means 13 is set to extract the drilling data excluding the extraction exclusion section as valid data. In other words, it is configured to set an extraction exclusion section from which data on the face properties is not considered to be obtained, and use the remaining part for the face evaluation. The extraction-excluded section is the section where the above-mentioned control of the rock drill 1 is functioning (drilling control section), and is the area surrounded by dashed lines X and Y in Figure 5. The extraction-excluded section X is the section corresponding to section L2 before the main drilling, and is the section where the feed pressure does not satisfy the preset data extraction criteria. The extraction-excluded section X can be easily identified by setting in advance the drilling length corresponding to this section. The extraction exclusion section Y is a section that is excluded based on the rotational pressure threshold value. In the extraction exclusion section Y, control (2) is performed to reduce the feed pressure when the rotational pressure exceeds the control threshold value K2, and this control causes the feed pressure to no longer satisfy the preset data extraction criteria. The control threshold value K2 is set to a value, for example, 3.5 (MPa) greater than the initial rotational pressure. The extraction exclusion section Y is set with a width that includes the parts that satisfy the data extraction criteria before and after the part where control (2) is performed. On the other hand, the area surrounded by dashed line Z in Fig. 5 is the section where the above-mentioned controls (1) and (3) of the rock drill 1 function, and is the subject of data extraction. In the area surrounded by dashed line Z, the rotation pressure exceeds the control thresholds K2 and K3, and control (3) is performed to reduce the feed pressure. Since poor ground such as a weak zone is expected, this area is treated as a soft rock mass and is subject to data extraction. The control threshold K3 is set to a value, for example, 5.0 (MPa) greater than the initial rotation pressure. The valid data extraction means 13 is configured to extract valid data that takes into account the control characteristics of rock drills 1 made by other manufacturers in a similar manner. This makes it possible to extract valid data that is optimal for each manufacturer.

[0019] The rock strength estimation means 14 estimates rock strength by a rock strength estimation processing program for estimating rock strength based on the valid data extracted by the valid data extraction means 13 (rock strength estimation step). Specifically, the rock strength estimation means 14 is configured to estimate the rock strength ahead of the tunnel face from the drilling speed associated with the valid data, based on the relationship between the drilling speed and compressive strength determined in advance using a test specimen. Here, the drilling test using the test specimen is conducted by preparing a homogeneous mortar test specimen with known strength, and drilling the mortar test specimen with each manufacturer's rock drilling machine 1. In this embodiment, a plurality of mortar test specimens with different strengths were prepared, and tests were conducted in which each test specimen was drilled with each manufacturer's rock drilling machine 1. Then, the relationship between the obtained drilling speed and the compressive strength obtained by a uniaxial compression test conducted using a separate test specimen was obtained. FIG. 6 is a graph showing the obtained relationship between the drilling speed and the compressive strength, which was used as an index for each manufacturer's rock drilling machine 1. For example, in the results of Company A, if the drilling speed is x and the compressive strength is y, the relational equation y=-56x+205 is obtained, and the compressive strength can be obtained from any drilling speed. Moreover, the rock strength estimation means 14 estimates the rock strength in the portion of the broken line Z that is deemed to be a soft rock by the effective data extraction means 13 to be uniformly set at, for example, 10 (MPa). The rock strength estimated by the rock strength estimation means 14 is stored in a storage device (not shown) together with the drilling data converted by the conversion means 12.

[0020] The visualization means 15 visualizes the rock strength by a visualization processing program for visualizing rock strength based on the rock strength estimated by the rock strength estimation means 14. Figure 7 shows the distribution of natural ground hardness and rock strength, where (a) is an explanatory diagram showing the drilling locations, and (b) is an explanatory diagram showing the rock strength distribution from drilling data based on the drilling locations. The visualization means 15 performs spatial data interpolation processing using a visualization processing program, and creates data for a rock mass strength contour distribution map at any cross section. The visualization means 15 then imports the created data for the rock mass strength contour distribution map into a general-purpose point cloud drawing software, and creates a two-dimensional rock mass strength contour distribution model as shown in Fig. 7(b) or a three-dimensional rock mass strength contour distribution model (not shown). The created two-dimensional or three-dimensional rock mass strength contour distribution model can be displayed on a monitor (not shown) of the management terminal device 10.

[0021] Here, as shown in FIG. 7(a), the drilling data is data obtained for each drilled blast hole H, and exists discretely with respect to the face. Therefore, in order to draw the rock strength contour distribution model shown in FIG. 7(b), it is necessary to estimate the drilling data of the points other than the data acquisition points by a geostatistical method (spatial interpolation processing). Therefore, in this embodiment, the data was estimated using a method called the inverse distance weighting method among the geostatistical methods. The inverse distance weighting method obtains an estimated value by a weighted average with the inverse of the distance as the weight, under the rule that the closer to the estimation point, the greater the influence on the averaging processing. In addition to this, by adding a data number acquisition limit and a data distance limit, it is possible to add an acquisition limit condition to the data used for estimation, rather than estimating data from the drilling data of the entire face. Note that the spatial processing method is not limited to the estimation of data using the inverse distance weighting method, and various methods, such as a method called the kriging method, may be used.

[0022] Next, the method for evaluating the natural ground ahead of a tunnel face according to this embodiment will be described with reference to Fig. 8. Fig. 8 is a flow chart showing the procedure for processing drilling data. As shown in Fig. 8, in step S1, the reading means 11 of the management terminal device 10 reads the drilling data of the rock drill 1. In step S1, the reading means 11 reads the drilling data of the rock drill 1 of each manufacturer via a communication means, a USB memory, or the like, using a reading processing program. In step S2, the conversion means 12 converts the hole drilling data, which differs for each manufacturer of the rock drill 1, into hole drilling data in a common format using a conversion processing program (standardization step, see FIG. 4). In step S3, the valid data extraction means 13 extracts valid data that takes into account the control characteristics of the rock drill 1 from the converted common format hole drilling data for each manufacturer using a valid data extraction processing program (valid data extraction step). In step S4, the rock strength estimation means 14 estimates the rock strength ahead of the tunnel face from the drilling speed associated with the valid data using a rock strength estimation processing program (rock strength estimation process). In step S5, the visualization means 15 performs spatial data interpolation processing using a visualization processing program, and creates data for a rock mass strength contour distribution map in an arbitrary cross section. In step S6, the visualization means 15 imports data for the rock mass strength contour distribution map into general-purpose point cloud drawing software, and creates two-dimensional and three-dimensional rock mass strength contour distribution models. In step S7, the worker checks the correlation between the rock strength contour distribution model and the hardness evaluation obtained from the face observation results or the compressive strength obtained near the face, and performs face evaluation.

[0023] According to the method for evaluating the ground ahead of the tunnel face of this embodiment described above, effective data that is effective for understanding the rock strength can be extracted from the drilling data obtained from the rock drill 1 and used to evaluate the ground, thereby enabling cost reduction through optimal blasting design. In addition, since data effective for grasping rock strength can be extracted taking into account the control characteristics of a plurality of rock drills 1 with different specifications for each manufacturer, the accuracy of the evaluation results can be improved. In addition, since the system includes a standardization process for standardizing drilling data, the evaluation of the natural ground in front of the tunnel face by multiple rock drilling machines 1 with different specifications for each manufacturer can be compared using the same evaluation index, improving the accuracy of the evaluation results. Even if the drilling data of the rock drilling machine 1 is saved in multiple files in different formats for each manufacturer, the drilling data can be managed centrally by standardization. In addition, since the rock strength can be estimated based on a predetermined relationship using a test specimen, it is possible to improve the accuracy of the evaluation results of the rock drill 1. Similarly, it is possible to improve the accuracy of the evaluation results for the natural ground evaluation in front of the tunnel face using a plurality of rock drills 1 with different specifications for each manufacturer. In addition, since an extraction exclusion section is set where drilling data is not extracted, it is possible to extract drilling data for sections suitable for evaluating natural ground properties and perform natural ground evaluation. This allows for cost reduction through optimal blasting design. It also allows for improved accuracy of evaluation results. In addition, sections where the feed pressure of the drilling data does not meet the predetermined data extraction criteria are sections that are likely to be unsuitable for grasping rock strength, so the accuracy of the evaluation results can be improved by excluding these sections as drilling control sections. In addition, since the rotation pressure of the drilling data makes it easy to estimate that the rock mass is soft, the accuracy of the evaluation results can be improved.

[0024] According to the ground evaluation system for the area ahead of the tunnel face of this embodiment, effective data that is effective for understanding rock strength can be extracted from the drilling data obtained from the rock drill 1, and ground evaluation can be performed, thereby enabling cost reduction through optimal blasting design. In addition, since data effective for grasping rock strength can be extracted taking into account the control characteristics of a plurality of rock drills 1 with different specifications for each manufacturer, the accuracy of the evaluation results can be improved. In addition, since it includes a conversion means for converting drilling data into a common format, the evaluation of the natural ground in front of the tunnel face by multiple rock drilling machines 1 with different specifications for each manufacturer can be compared using the same evaluation index, improving the accuracy of the evaluation results. Even if the drilling data of the rock drilling machine 1 is saved in multiple files in different formats for each manufacturer, the drilling data can be managed in a unified manner using a common format. In addition, since the visualization means 15 is included, it is possible to perform a ground evaluation in front of the tunnel face based on the spatially interpolated rock strength, thereby improving the accuracy of the evaluation results.

[0025] According to the drilling data processing program of this embodiment, useful data that is effective for understanding rock strength can be extracted from the drilling data obtained from the rock drilling machine 1 and used to perform ground evaluation, thereby enabling cost reduction through optimal blasting design. In addition, since data effective for grasping rock strength can be extracted taking into account the control characteristics of a plurality of rock drills 1 with different specifications for each manufacturer, the accuracy of the evaluation results can be improved.

[0026] Although an embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and each of the above components can be appropriately modified without departing from the spirit of the present invention. For example, the conversion means 12 may perform averaging and filtering of the drilling data converted into a common file format. In this case, the data before and after the processing may be configured to be output as a machine data graph. Furthermore, the conversion processing program, the valid data extraction processing program, the rock strength estimation processing program, and the visualization processing program may be provided in multiple types so as to correspond to the rock drill 1 of each manufacturer. In this case, the processing may be configured to automatically correspond to the rock drill 1 of each manufacturer. [Explanation of symbols]

[0027] 1 Drilling machine 10 Management terminal 11 Reading method 12 Conversion methods 13 Means of extracting valid data 14. Methods for estimating rock mass strength 15 Visualization means 100. Rock mass evaluation system ahead of tunnel face

Claims

1. A method for evaluating ground in front of a tunnel face, comprising: a valid data extraction step of extracting valid data that satisfies a preset data extraction criterion from the drilling data of the rock drill; a rock strength estimation step of estimating rock strength based on the valid data; A method for evaluating the ground ahead of a tunnel face, including:

2. The method for evaluating the ground ahead of a tunnel face as described in claim 1, characterized in that when there are multiple rock drills, it includes a standardization step for standardizing the drilling data obtained from each of the multiple rock drills.

3. The method for evaluating the ground ahead of a tunnel face as described in claim 1 or claim 2, characterized in that the rock strength estimation process estimates the rock strength ahead of the tunnel face from the drilling speed of the rock drill machine based on the relationship between the drilling speed and compressive strength determined in advance using a test specimen.

4. The drilling data is data on at least a drilling speed, an impact pressure, a feed pressure, and a rotation pressure, In the valid data extraction step, an extraction exclusion section is set within the length of the hole drilled by the rock drill machine, from which the drilling data is not extracted; The extraction exclusion section is The pre-drilling section, which is the section before the actual drilling takes place, and A method for evaluating the ground ahead of a tunnel face as described in claim 1, characterized in that the method includes a drilling control section in which the drilling data does not satisfy a predetermined data extraction standard, in the section in which the drilling is performed.

5. The method for evaluating ground ahead of a tunnel face according to claim 4, characterized in that the drilling control section is a section in which the feed pressure of the drilling data does not satisfy a preset data extraction standard.

6. The method for evaluating the ground ahead of a tunnel face as described in claim 4 or claim 5, characterized in that the rock strength estimation process, when the rotational pressure of the drilling data exceeds a predetermined threshold, sets a predetermined section to include the part that exceeds the threshold, and estimates that the predetermined section is a soft rock with low rock strength.

7. A rock drill and A management terminal device for processing drilling data acquired from the rock drilling machine; A system for evaluating the ground in front of a tunnel face, comprising: The management terminal device A reading means for reading the drilling data acquired from the rock drilling machine; A valid data extraction means for extracting valid data from the drilling data; a rock strength estimation means for estimating rock strength based on the available data; A ground evaluation system in front of a tunnel face.

8. The ground evaluation system ahead of a tunnel face as described in claim 7, characterized in that the management terminal device is equipped with a conversion means for converting the drilling data obtained from each of the multiple rock drills into a common format when there are multiple rock drills.

9. The system for evaluating natural ground ahead of a tunnel face according to claim 7 or 8, characterized in that the management terminal device is provided with a visualization means for spatially interpolating the rock strength.

10. A drilling data processing program for processing drilling data acquired from a rock drilling machine, On the computer, a reading process for reading the drilling data obtained from the rock drilling machine; A conversion process for converting the drilling data into a common format; A valid data extraction process for extracting valid data from the drilling data; A rock strength estimation process for estimating rock strength based on the valid data; A drilling data processing program that executes the above.

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