JP6131160B2 - Rock exploration method, rock exploration system, and drilling data correction device for rock exploration - Google Patents

Description

  The present invention relates to a rock exploration technique suitable for use in rock evaluation in front of a tunnel face, mainly when excavating a tunnel or the like, and in particular, information obtained from a percussion drill (crag drill) in a drill hole. The present invention relates to a rock exploration method, a rock exploration system, and a drilling data correction device for rock exploration, for exploring the condition of a target rock.

Conventionally, as a method for exploring a rock mass, attempts have been made to use drilling data obtained from a drilling machine in a drilling hole (see, for example, Patent Document 1). Many conventional rock mass exploration methods place importance on the impact energy and drilling speed of drilling data obtained from drilling machines, and are based on the fracture energy per unit volume given to the bedrock by drilling machines. Is almost.
However, a change in rotational pressure obtained as a result of drilling becomes a change in the number of revolutions, which greatly affects the drilling state. For this reason, if this evaluation information is missing, there is a risk of causing a serious difference in evaluation, and the present inventor considered that a change in rotational pressure becomes an important evaluation index for rock mass evaluation.

  On the other hand, for example, in the method for discriminating formation rock described in Patent Document 2, a rotary percussion drill (drilling machine) is used, and the ground is added to the sum of propulsion energy, rotational energy and impact energy per unit volume, that is, rotational energy is added. This is a comprehensive evaluation based on the input energy, and is an effective investigation method when drilling a relatively soft and stable ground with a rotary percussion drill.

Japanese Examined Patent Publication No. 7-49756 Japanese Patent No. 3831904

However, although the method for discriminating formation rocks described in Patent Document 2 is effective for evaluating relatively soft and stable hard and soft rocks, it is an evaluation that captures rocks such as discontinuous layers with complex conditions. In particular, it is not suitable as an exploration method for tunnel excavation in which hard and unstable conditions are mixed.
For example, in the crushing zone, normal perforation is impaired and non-uniform flouring results in drilling resistance, so that the rotational pressure during drilling increases and the rotational speed decreases. Then, since the evaluation is simply based on the total input energy with rotational energy added, if the fracture energy increases due to a decrease in the drilling speed, an incorrect evaluation contradicting the actual condition that the bedrock has become harder is made. There is a risk.

  Accordingly, the present invention has been made paying attention to such problems, and is a rock mass exploration method that can be suitably evaluated in both evaluation of hard rocks and rocks such as discontinuous layers. Another object of the present invention is to provide a rock exploration system and a drilling data correction device for rock exploration.

  In order to solve the above-described problems, the rock exploration method according to the first aspect of the present invention is one of the aspects of the present invention, and the condition of the target rock is based on information obtained from the percussion drill in the drilling hole. A rock exploration method for exploring, wherein a drilling speed and rotational pressure are obtained as measured drilling data by drilling a target rock with the percussion drill by drilling holes, and based on the drilling speed Based on the relationship between the rock mass strength determining step for determining the rock strength of the target rock mass, the rock mass property determining step for determining the rock mass property of the target rock mass based on the rotational pressure, and the relationship between the rock mass strength and the rock mass property Based on the relationship between the natural ground classification determination process for determining the natural rock classification of the target rock mass, and the natural rock grade of the reference rock mass as the determination reference and the determination result of the natural rock classification , Characterized in that it comprises a natural ground grade determination step of determining the natural ground grade rock of interest.

  Further, the rock exploration method according to the second aspect of the present invention is a rock exploration method for exploring the condition of a target rock based on information obtained from a percussion drill in a drilling hole, and A reference drilling value setting step for setting a reference drilling value based on a preliminary drilling with the percussion drill for the reference rock mass to be measured, and an actual drilling for drilling the target rock with the percussion drill to obtain measured drilling data A data acquisition step, a rock strength discriminating step for discriminating a rock strength of a target rock based on a comparison of a drilling speed between the reference drilling value and the measured drilling data, and a mutual relationship between the reference drilling value and the measured drilling data The rock mass discrimination process to discriminate the rock mass of the target rock mass based on the comparison of the rotation pressure, and the rock mass strength in the rock mass discrimination process Based on the relationship between the determination result and the rock property determination result in the rock property determination step, the natural ground classification determination step for determining the natural ground classification of the target rock mass, and the ground relative to the natural rock grade of the reference rock mass And a natural ground grade discrimination step of discriminating the natural ground grade of the target rock based on the relationship of the discrimination results of the natural ground classification in the mountain classification discrimination step.

  In order to solve the above problems, a rock mass exploration system according to an aspect of the present invention is a rock mass exploration system for exploring the condition of a target rock mass based on information obtained from a percussion drill in a drill hole. The actual rock drilling data acquisition means for drilling the target rock mass with the drilling hole by the drilling hole and acquiring the drilling speed and rotational pressure as the actual drilling data, and the rock mass strength of the target rock mass based on the drilling speed The rock strength discriminating means for discriminating the rock mass, the rock mass property discriminating means for discriminating the rock mass property of the target rock mass based on the rotational pressure, and based on the relationship between the rock mass strength and the rock mass property, Based on the relationship between the natural ground classification discriminating means for discriminating the natural ground classification, the natural rock grade of the reference rock mass used as the reference for determination, and the discrimination result of the natural ground classification, the natural ground of the target rock mass And having a natural ground grade judging means for judging grade.

  According to the present invention, the determination of the rock mass strength based on the drilling speed and the determination of the rock property based on the rotational pressure are performed separately, and the ground classification of the target rock mass is determined based on the relationship between these determination results. In addition, the target rock mass is determined based on the relationship between the standard rock mass level and the classification result of the natural rock classification. However, while classifying the rock hardness evaluation obtained based on the drilling speed, the change in rotational pressure is regarded as the degree of load resistance applied according to the complicated rock properties, and the classification is performed. A comprehensive evaluation is possible. Therefore, since the rock can be evaluated by selecting parameters according to the drilling theory of the percussion drill, the relative comparison with the reference rock can be performed with high accuracy. Therefore, even if it is a rock in which a complicated state is mixed, a suitable rock can be evaluated both in the evaluation of the hard soft rock of the rock and in the evaluation of the rock quality such as the discontinuous layer.

  In addition, percussion drills (shear rock drills) transmit shock waves generated by the striking mechanism to the bedrock through the bit at the end of the rod while changing the phase using the rotation mechanism, and crush the bedrock while using the feed mechanism to break the bottom of the hole. The above-mentioned rotary percussion drill (drilling machine) scrapes the ground with rotational torque, and drills by adding a striking function. It is a device with enhanced capability (sometimes it is drilled only by rotation), and both have fundamentally different drilling mechanisms.

  Here, in the rock mass exploration method according to an aspect of the present invention, the rock strength determination step includes a correction obtained by applying a correction formula to the drilling speed acquired as the actually measured drilling data as the drilling speed used for the determination. Using the drilling speed, the rock property determination step uses the corrected rotation pressure obtained by applying a correction formula to the rotation pressure acquired as the measured drilling data as the rotation pressure used for the determination, and the measured drilling data acquisition step The drilling is performed based on a preset reference drilling value at the start of drilling, and thereafter, the corrected drilling speed or the corrected rotational pressure is used according to the drilling situation as the drilling speed or the rotational pressure used for drilling. preferable.

  With such a configuration, if correction is not performed, it takes an enormous amount of measurement time. However, the drilling speed or rotational pressure in the actual drilling data acquisition process is corrected so as to be optimized according to the drilling situation at that time. As a result, the measurement time can be shortened and a situation in which drilling cannot be performed can be prevented. Further, since the data used for discrimination in the rock mass strength discrimination step and the rock mass property discrimination step is corrected, it is more suitable for improving the exploration accuracy.

In the rock exploration method according to one aspect of the present invention, the reference rock is a rock from which boring data has been collected in advance, and the ground level is selected from any one of B, CI, and CII. It is preferable that there is.
If it is such a structure, the information of the boring data implemented beforehand will be acquired in the case of rock mass evaluation, and the rock mass by which the ground grade classification by this will be understood will be set as a reference rock mass. Therefore, it is important to evaluate the rock mass after setting the standard drilling value based on the assumption for the standard rock mass or the preliminary drilling such as the test drilling. It is more suitable for performing.

  In order to solve the above-mentioned problem, a drilling data correction device for rock exploration according to an aspect of the present invention is a rock that explores the condition of a target rock based on information obtained from a percussion drill in a drilling hole. A drilling data correction device for rock exploration used in a survey system, which corrects drilling data used for drilling holes in the percussion drill according to a drilling situation, wherein the rock exploration system is the target rock in the percussion drill A rock exploration system according to an aspect of the present invention, wherein the drilling speed and the rotational pressure are acquired as measured drilling data by drilling with a drill hole, and the drilling data correction device includes the drilling speed acquired as the measured drilling data. A correction drilling speed calculating means for calculating a corrected drilling speed by applying (Equation 1) as a correction formula to the correction formula, and the measured drilling data Correction rotational pressure calculating means for calculating the corrected rotational pressure by applying (Equation 2) as a correction formula to the rotational pressure acquired in this manner, and using the calculated corrected drilling speed or corrected rotational pressure for the drilling hole. It is characterized by being output as perforation data.

  According to the drilling data correction device for rock exploration according to one aspect of the present invention, the drilling data used for drilling can be corrected according to the drilling situation and output, so if this is used in a rock drilling system, In addition to shortening the measurement time, it is possible to prevent a situation in which drilling cannot be performed. In addition, the search accuracy can be improved.

  As described above, according to the present invention, the evaluation can be suitably performed in both the evaluation of hard and soft rocks and the evaluation of rock quality such as discontinuous layers.

It is a mimetic diagram explaining a tunnel face front exploration system which performs a rock exploration method concerning one mode of the present invention. It is a flowchart of the natural ground grade discrimination | determination process performed with the tunnel face front search system of FIG. It is a graph which shows one Example of the drilling speed ratio in the drilling length at any time obtained by the tunnel face front search by the tunnel face front search system which concerns on this invention. It is a graph which shows one Example of the rotational pressure ratio in the drilling length at any time obtained by the tunnel face front search by the tunnel face front search system which concerns on this invention. It is a graph which shows one Example of the ground grade classification | category in the drilling length at any time obtained by the tunnel face front search by the tunnel face front search system which concerns on this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
The rock mass exploration method of the present embodiment is an example implemented by a tunnel face front exploration system for exploring a rock surface in front of a tunnel face as an example of exploring the rock, and a rock in front of the face is drilled by a drill hole with a percussion drill. Based on the drilling data obtained at the time of drilling, the type of rock mass (geological grade classification) with respect to the drilling length at any time where the bit is hit is automatically determined.

  Specifically, as shown in FIG. 1, the tunnel face forward exploration system 1 includes a percussion drill 10. The percussion drill 10 is mounted on a self-propelled carriage 2. The carriage 2 includes a drive unit 8 including a hydraulic pressure generator and an engine. A boom 3 is provided in front of the carriage 2 so as to be raised and lowered. A hydraulic drifter body 5 is attached to the tip of the boom 3 via a guide shell 4. The drifter body 5 is slidable along the guide shell 4 by a feed mechanism (not shown). A rod 6 having a bit 7 at the tip is attached to the drifter body 5. A carbide chip is embedded in the most advanced portion of the bit 7. The drifter body 5 includes a percussion mechanism that applies a striking force to the rod 6 and a rotation mechanism that rotates the rod 6 in order to change the phase of the bit 7 that contacts the rock. Here, the role of the rotation mechanism in the percussion drill 10 is to change the state of contact between the carbide tip at the tip of the bit and the rotation axis of the rock mass for each impact, and does not scrape the rock mass with rotational torque. The rod 6 can be added each time a predetermined length of drilling is made according to the perforation length.

  In this tunnel face front exploration system 1, the percussion drill 10 drills a rock to be surveyed, and hydraulic data acquired at any time during drilling is input to the control device 20. . The control device 20 is an information processing device including a computer, and can automatically determine the ground level by executing a predetermined program related to the ground level determination process described later.

Next, the ground level classification process executed by the control device 20 of the tunnel face forward exploration system 1 will be described with reference to FIG.
When this natural ground grade discrimination process is executed by the control device 20, the process proceeds to step S1 in FIG. 2 and first reads a pre-stored reference perforation value, and then reads the read standard perforation value. Is set as a reference value for the discrimination processing (reference perforation value setting step). When setting the standard drilling value, select a rock mass of B, CI or CII from the rocks from which the boring data was collected in advance in the ground at the same site and select this as the “standard rock mass”. It is set by performing preliminary drilling with a percussion drill on this reference rock. In this embodiment, the reference bedrock is not selected from ground grades other than B, CI, and CII. Here, the “ground mountain grade” in this step S1 is set according to “Road Tunnel Technical Standard (Structure) / Summary November 2003 Japan Road Association Table 5-2-1 Ground Mountain Classification Table”. To do.

Then, the striking pressure, feed pressure, perforation speed, and rotation pressure based on the hydraulic pressure data acquired at the time of the preliminary perforation are set as the reference perforation values (reference striking pressure, reference feed pressure, reference perforation speed, and reference rotation pressure).
The reference piercing value is a reference feed pressure, a reference striking pressure, a reference rotation pressure, and a reference piercing speed acquired at the time of preliminary piercing. Each reference pressure is measured by each hydraulic sensor provided so that it can detect the hydraulic pressure of the feed mechanism that slides the drifter body 5, the hydraulic pressure of the percussion mechanism that strikes the rod 6, and the hydraulic pressure of the rotation mechanism that rotates the rod 6. To do. The reference drilling speed is calculated from the measured value of the operation amount detection sensor provided in the feed mechanism.

  After setting the reference drilling value in step S1, the process proceeds to the subsequent step S2, and actual drilling is performed on the ground in front of the face. The measured drilling is a long hole drilling while adding the rod 6. Each drilling condition at the time of the actual drilling is based on the condition at the time of the preliminary drilling. During the actual drilling, the striking pressure, feed pressure, drilling speed, and rotational pressure are measured at any time by each hydraulic sensor, and the control device 20 obtains the measured drilling values (measured hammering pressure, actual feed pressure, actual drilling). Speed, measured rotational pressure) (actual drilling data acquisition step).

  When the actual drilling value is obtained, the process proceeds to the subsequent step S3, and the corrected drilling value (corrected drilling speed, corrected rotational pressure) is calculated by applying the actual drilling value to the correction formula. Here, the corrected drilling speed is calculated by comparing the measured drilling speed with the relationship between the reference feed pressure and the measured feed pressure, the relationship between the reference striking pressure and the measured striking pressure, and the situation of the number of rods for percussion drill drilling. It is preferable to use one corrected in accordance with the relationship, and the corrected rotational pressure is obtained by correcting the actually measured rotational pressure in accordance with the situation of the number of rods for percussion drill drilling. The correction perforation value is applied when two or more rods 6 are added, and when there is one rod 6, the process proceeds to the subsequent steps without correction.

  In the present embodiment, the corrected drilling speed and the corrected rotational pressure are calculated as the corrected drilling values by the following (Formula 1) and (Formula 2), respectively. In (Equation 1) and (Equation 2), D is the attenuation factor obtained by adding one rod 6. The attenuation rate is set in a range of 0 <D ≦ 0.1, for example. In the present embodiment, the attenuation factor is 2% (D = 0.02).

When the corrected perforation value (corrected perforation speed, corrected rotational pressure) is calculated, the process proceeds to the following steps S4 to S6, and a discrimination process of ground mountain classification is executed. In the determination process of the natural ground classification, the natural ground classification is determined by comparing the reference drilling value and the corrected drilling value. That is, in the discrimination processing of the natural ground classification, first, the process proceeds to step S4, and the hardness of the rock ranging from the harder to the softer than the reference rock is classified into a plurality of categories using the drilling speed as a parameter (rock strength determination). Process). In the example of the present embodiment, the rock hardness is classified into the following X1 to X4 based on the fluctuation value of the corrected drilling speed with the reference drilling speed set to 100.
X1: 70 or less: Stable rock that is harder than the reference rock X2: More than 70 and 130 or less: The same rock as the reference rock X3: More than 130 and 200 or less: Stable rock that is softer than the reference rock X4: 200 Exceeding: Rock bed that is much softer than the standard bedrock

Next, the process proceeds to step S5, where the rock properties are classified into a plurality of sections using the rotational pressure as a parameter (rock property determining step). The properties of the rock mass in this embodiment are classified into the following Y1 to Y4 according to the fluctuation value of the corrected rotational pressure, with the reference rotational pressure being 100.
Y1: When 80 or less: Clay layer / cavity Y2: When exceeding 80 and 120 or less: Properties equivalent to the standard bedrock Y3: When exceeding 120 and 140 or less: Strong weathering / Slightly rough discontinuous layer Y4: Over 140 Case: Rough discontinuous layer (fracture zone)

Next, the process proceeds to the subsequent step S6, and the natural ground classification is determined by combining the rock hardness and rock properties classified into the plurality of categories (natural ground classification determining step). In step S6 of the present embodiment, in determining the natural ground classification, first, a comprehensive natural ground classification is set as the following Z1 to Z6.
Z1: Stabilized rock mass harder than standard Z2: Standard rock mass Z3: Stable rock mass softer than standard Z4: Strongly weathered / slightly rough discontinuous layer Z5: Rock mass much softer than standard Z6: Clay layer / cavity or coarse discontinuous layer (crushing) band)

  And the relationship between the discrimination results of the rock mass hardness: X1 to X4 and (step S4), and the rock mass properties: Y1 to Y4 (step S5), in a matrix form, ranging from good to bad. The natural ground classifications Z1 to Z6 obtained in correspondence with these combinations are determined based on Table 1 below.

  Next, the process proceeds to step S7, and finally the ground level in front of the face is determined from the ground level classifications Z1 to Z6 and the ground level B, CI, CII of the reference rock (ground level classification step). . Here, the relationship between the ground rock grades B, CI, and CII of the reference rock mass and the ground rock classifications Z1 to Z6 was arranged in a matrix from a good level to a bad level. And the natural ground grade as a result of exploration of the front face of the face obtained corresponding to these combinations is as shown in Table 2 below.

By the series of processes described above, the natural ground grade as a result of the search for the front face of the face is obtained, and this is stored in the storage device as data associated with the perforation length (m), and the process proceeds to step S8.
In step S8, it is determined whether or not the actual drilling has been completed. If the actual drilling has been completed (Yes), the natural ground grade determination process is terminated; otherwise (No) the process is performed. Returning to S2, the processes in steps S2 to S7 are repeated until the actual drilling is completed. In this way, the natural ground grade discrimination process obtains an actual measured drilling value at any time, and a series of natural ground grade discrimination processes related to the judgment of the natural ground grade from the calculation of the corrected drilling value based on this is automatically performed by the computer program. Processed.

Next, the effect of the tunnel face forward exploration method (rock exploration method) by the tunnel face forward exploration system 1 will be described.
When rock exploration is performed with the tunnel face forward exploration system 1 described above, select a rock mass of B, CI, or CII from the rock mass from which the drilling data has been collected in advance. This is used as a reference rock mass, and preliminary drilling is performed on the reference rock mass with a percussion drill 10 to set a reference drilling value (reference striking pressure, reference feed pressure, reference drilling speed, reference rotational pressure) (step). S1).

Next, the operator installs the percussion drill 10 at a predetermined position with respect to the target rock of the natural ground to be searched forward of the face by moving the carriage 2, the boom 3, and the like. The example shown in FIG. 1 is an example in which a percussion drill 10 is installed on the face S of the tunnel T for the purpose of exploring the front face of the tunnel.
When the operator installs the percussion drill 10 at an intended position of the target rock, the operator starts the actual drilling of the long hole while driving the drifter body 5 and adding the rod 6. As a result, the control device 20 simultaneously executes the above-mentioned ground level classification process, and hydraulic data acquired at the time of drilling is input to the control device 20 to acquire measured drilling data (step S2). The respective drilling conditions at the start of the actual drilling are based on the reference drilling value at the time of the preliminary drilling. However, the drilling conditions (drilling speed, rotational pressure) are appropriately determined according to the state of the ground and the addition state of the rod 6. ) Measure drilling while changing. In the present embodiment, the above-described corrected drilling speed or corrected rotational pressure is used as the drilling speed or rotational pressure used for the actual drilling. The appropriate change of the drilling conditions may be automatically performed according to a command from the control device 20, or may be manually changed by the operator depending on the situation. This prevents the rod 6 from biting into the rock and making it unperforated (so-called “bamboo shoot state”) while shortening the time for exploring the front of the face.

Thereafter, when the operator continues the actual drilling, the control device 20 repeatedly executes the processes of steps S2 to S7 until the actual drilling is completed, and as a result of exploring the front of the face over the entire length of the drilling length. The natural ground grade is stored in the storage device as data associated with the perforation length (m) (steps S2 to S7).
Thereby, if it is this tunnel face front exploration system 1, based on the drilling information obtained at any time from the percussion drill 10 in a drilling hole, the condition of the rock mass to be explored can be explored. In addition, in FIGS. 3 to 5, drilling obtained at any time is carried out by conducting actual drilling over the drilling length of 30 m on the rock to be surveyed after selecting the rock mass with the ground grade classification “CI” as the reference rock mass. It is the Example of the tunnel face front exploration which determined the natural ground grade division automatically based on information.

  Thus, according to the rock mass exploration method performed in the tunnel face forward exploration system 1 of the present embodiment, the rock mass is classified based on the drilling speed (step S4), and the rock properties are classified based on the rotational pressure ( In step S5), both are arranged in a matrix (Table 1), and the target rock mass classification is determined (step S6). Further, the relationship of the determination result of the natural rock classification to the natural rock grade of the reference rock mass is matrixed. The ground grade (step S7) is discriminated in the form (Table 2).

The feature of the rock mass exploration method of this embodiment is that the evaluation classification based on the rotational pressure is added to the evaluation classification based on the drilling speed, so that the parameters are selected according to the drilling theory of the percussion drill and the rock mass is evaluated. Therefore, it is suitable for forward exploration of rocks with complex conditions.
In other words, the change in the rotational pressure of the percussion drill is recorded as a result pressure for whether the drilling state is good or bad. For example, in the crushing zone, normal perforation is impaired and non-uniform flouring becomes resistance, so that the rotational pressure increases and the rotational speed decreases. In this regard, the conventional ground survey method (for example, Patent Document 2) has made a wrong evaluation contrary to the actual condition that “the rock mass has become harder” due to the increase in fracture energy due to the decrease in drilling speed. There is a risk that.

  On the other hand, according to the rock mass exploration method of the present embodiment, the rock pressure evaluation according to the change in the rotation pressure is compared with the reference drilling value in the same manner as the rock mass evaluation according to the change in the drilling speed. Can be evaluated and classified as a degree of load resistance applied according to complex rock properties. Furthermore, the rock hardness evaluation classification obtained by rock mass evaluation according to changes in drilling speed and the complex rock mass evaluation classification obtained by rock mass evaluation according to changes in rotational pressure are combined in a matrix. By performing the evaluation, it is possible to accurately perform a relative comparison with the reference rock mass.

  Therefore, according to the rock mass exploration method of the present embodiment, suitable rock mass evaluation can be performed in both evaluation of hard and soft rocks and evaluation of rock quality such as discontinuous layers. In addition, according to the rock exploration method of the present embodiment, the position of the bad ground can be easily extracted by adding the evaluation of the rock properties to the evaluation of the hard and soft rocks of the rock. It is easy to grasp effective uniaxial compressive strength (estimation).

  Further, according to the rock mass exploration method of the present embodiment, it is easy to grasp the state of the drilling speed and the rotational pressure at the time of actual drilling accompanying the exploration by setting the reference rock mass in advance. In other words, according to the rock exploration of the present embodiment, preliminary drilling is performed on the reference rock, and actual drilling is performed based on the conditions at the time of preliminary drilling. Depending on the situation, the control device 20 or the operator performs the drilling while appropriately changing the drilling conditions, so that the drilling speed and the rotational pressure can be optimally corrected according to the situation at that time. Therefore, when correction is not performed, an enormous amount of measurement time is required, while the measurement time can be shortened and a situation in which drilling cannot be performed can be prevented. In addition, the accuracy of forward search can be improved.

  That is, in general, when observing an observation target by comparison with a reference value, it can be said that it is a conventional means to measure the observation target while maintaining the conditions for obtaining the reference value as it is. If it is a rock exploration method that is performed while maintaining the predetermined drilling conditions at all times, it will take a very long time to judge, and if it cannot cope with the unexpected change of the rock mass, it may be impossible to drill.

  For example, drilling efficiency is reduced by adding multiple rods (for example, about 30m at the maximum), so the drilling speed will decrease rapidly unless the feed pressure is increased according to the rod addition status (in some cases, it will stop due to insufficient thrust) ) And the determination time increases. Conversely, when drilling the crush zone, the rod may get stuck unless the feed pressure is lowered instantaneously, resulting in a situation where drilling cannot be continued.

  On the other hand, in the rock exploration method of the present embodiment, while the reference drilling value is set as the basic drilling condition, the operator is allowed to adjust the drilling condition as appropriate while watching the drilling state. Since the corrected drilling value is calculated from the actual drilling value, which is the drilling condition, and compared with the reference drilling value, it is possible to adjust the drilling condition to maintain an appropriate drilling state even if the rock mass unexpectedly changes. it can. Accordingly, it is possible to shorten the measurement time and to prevent a situation in which the drilling cannot be performed in advance.

  Further, according to the rock mass exploration method of the present embodiment, the ground level classification process is automatically executed by the control device 20, so that it is possible to determine (estimate) the ground level classification with the subjectivity excluded as much as possible. Therefore, by applying the forward face exploration technology of the present invention, it is possible to give a drilling machine a finer control signal than the drilling control based on the conventional rock exploration, and the accuracy of the automatic drilling technology Will improve dramatically.

It should be noted that the rock exploration method according to the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the example in which the percussion drill 10 is installed on the face S of the tunnel T for the purpose of exploring the tunnel face forward is described. However, the present invention is not limited to the forward exploration of the tunnel face, and the bedrock according to the present invention. The exploration method can be applied to the purpose of exploring the condition of the rock mass.

DESCRIPTION OF SYMBOLS 1 Tunnel face search system 2 Bogie 3 Boom 4 Guide shell 5 Drifter body 6 Rod 7 Bit 8 Drive part 10 Percussion drill 20 Controller T Tunnel S Face

Claims (12)

A rock exploration method for exploring the condition of a target rock based on information obtained from a percussion drill in a drill hole,
An actual drilling data acquisition step of acquiring a drilling speed and a rotational pressure as actual drilling data by drilling a target rock with the percussion drill, and determining a rock mass strength of the target rock based on the drilling speed Based on the relationship between the rock strength discriminating step, the rock mass discriminating step for discriminating the rock mass properties of the target rock mass based on the rotational pressure, and the rock mass classification based on the relationship between the rock mass strength and the rock mass properties A natural ground classification that determines the natural ground grade of the target rock mass based on the relationship between the natural ground classification determination process for determining the natural ground, the natural rock grade of the reference rock base used as the determination criterion, and the determination result of the natural ground classification A rock exploration method comprising a discrimination step.   The said actually measured drilling data acquisition process, the said rock mass strength discrimination | determination process, the said rock mass property discrimination | determination process, the said natural ground classification discrimination | determination process, and the said natural ground grade discrimination | determination process are performed by a control apparatus. Rock bed exploration method. The rock mass strength determining step uses a corrected drilling speed obtained by applying a correction formula to the drilling speed acquired as the measured drilling data, as the drilling speed used for the determination,
The bedrock property determination step uses a corrected rotation pressure obtained by applying a correction formula to the rotation pressure acquired as the actually measured drilling data as the rotation pressure used for the determination,
In the actual drilling data acquisition step, drilling is performed based on a preset reference drilling value at the start of drilling, and thereafter, the corrected drilling speed or corrected rotational pressure is set to the drilling state as the drilling speed or rotational pressure used for drilling. The rock mass exploration method according to claim 1, wherein the rock mass exploration method is used according to claim 1. A rock exploration method for exploring the condition of a target rock based on information obtained from a percussion drill in a drill hole,
A reference drilling value setting step for setting a reference drilling value based on preliminary drilling with the percussion drill with respect to the reference rock as a criterion for determination;
An actual drilling data acquisition step for acquiring actual drilling data by drilling a target rock with the percussion drill with a drill hole;
Rock mass strength determination step of determining the rock mass strength of the target rock mass based on the comparison of the drilling speed between the reference drilling value and the measured drilling data;
A rock property determination step for determining a rock property of a target rock based on a comparison of rotational pressure between the reference drilling value and the measured drilling data,
Based on the relationship between the determination result of the rock mass strength in the rock strength determination step and the relationship between the determination results of the rock property in the rock property determination step, the natural ground classification determination step for determining the natural rock classification of the target rock mass,
A natural ground grade determining step for determining the natural ground grade of the target rock based on the relationship of the determination result of the natural ground classification in the natural ground classification determining step with respect to the natural ground grade of the reference rock mass. The rock exploration method.   The reference drilling value setting process, the measured drilling data acquisition process, the rock mass strength determination process, the rock mass property determination process, the natural ground classification determination process, and the natural ground grade determination process are executed by a control device. The rock exploration method according to claim 4. The rock mass strength determining step uses a corrected drilling speed obtained by applying a correction formula to the drilling speed acquired as the measured drilling data, as the drilling speed used for the determination,
The bedrock property determination step uses a corrected rotation pressure obtained by applying a correction formula to the rotation pressure acquired as the actually measured drilling data as the rotation pressure used for the determination,
The actual drilling data acquisition step performs drilling based on the reference drilling value at the start of drilling, and thereafter uses the corrected drilling speed or the corrected rotational pressure as the drilling speed or rotational pressure used for drilling according to the drilling situation. The bedrock exploration method according to claim 4 or 5, characterized in that. As the reference piercing value, a reference striking pressure, a reference feed pressure, a reference piercing speed and a reference rotational pressure are acquired,
As the measured drilling data, measured impact pressure, measured feed pressure, measured drilling speed and measured rotational pressure are acquired,
The corrected drilling speed includes the measured drilling speed, the relationship between the reference feed pressure and the measured feed pressure, the relationship between the reference striking pressure and the measured striking pressure, and the number of rods for drilling the percussion drill. Use the one corrected according to the relationship with the situation,
7. The rock exploration method according to claim 6, wherein the corrected rotational pressure is obtained by correcting the measured rotational pressure in accordance with the number of rods for drilling the percussion drill. The corrected drilling speed is obtained by applying (Equation 1) as a correction formula,
The rock mass exploration method according to claim 7, wherein the corrected rotational pressure is obtained by applying (Equation 2) as a correction equation.
However, in (Formula 1) and (Formula 2), D is an attenuation factor by adding one rod.

  9. The base rock according to any one of claims 1 to 8, wherein the base rock is a rock from which boring data has been collected in advance, and the ground grade is selected from any one of B, CI, and CII. The rock exploration method according to one item. A rock mass exploration system for exploring the condition of a target rock mass based on information obtained from percussion drills in drill holes,
Drilling the target rock with the percussion drill and drilling the drilling speed and rotational pressure as measured drilling data, and determining the rock strength of the target rock based on the drilling speed Rock strength discrimination means, rock mass discrimination means for discriminating the rock property of the target rock based on the rotational pressure, and ground mass classification of the target rock based on the relationship between the rock strength and the rock property A natural ground classification classifying means for determining the natural ground grade of the target rock mass, based on the relationship between the natural ground classification determining means for determining the natural ground, the natural rock grade of the standard rock base used as the determination reference, and the determination result of the natural rock classification A rock exploration system characterized by having a discrimination means. The rock mass strength discriminating means uses a corrected drilling speed obtained by applying a correction formula to the drilling speed acquired as the measured drilling data, as the drilling speed used for the determination,
The rock property determination means uses a corrected rotation pressure obtained by applying a correction formula to the rotation pressure acquired as the actually measured drilling data as the rotation pressure used for the determination,
The measured drilling data acquisition means performs drilling based on a preset reference drilling value at the start of drilling, and thereafter sets the corrected drilling speed or corrected rotational pressure as the drilling status as the drilling speed or rotational pressure used for drilling. The rock exploration system according to claim 10, wherein the rock exploration system is used accordingly. Based on the information obtained from the percussion drill in the drilling hole, it is used in the rock exploration system to search the condition of the target rock, and the drilling data used for drilling holes in the percussion drill is corrected according to the drilling situation A drilling data correction device for exploration,
The rock exploration system according to claim 11, wherein the rock exploration system drills the target rock with the percussion drill by drilling holes and acquires the drilling speed and rotational pressure as measured drilling data.
The perforation data correcting device is a corrected perforation speed calculating means for calculating a corrected perforation speed by applying (Equation 1) as a correction formula to the perforation speed acquired as the actual perforation data, and acquired as the actual perforation data. A correction rotational pressure calculating unit that calculates the corrected rotational pressure by applying (Equation 2) as a correction formula to the rotational pressure, and outputs the calculated corrected drilling speed or the corrected rotational pressure as drilling data to be used for drilling holes. Drilling data correction device for rock exploration characterized by this.
However, in (Formula 1) and (Formula 2), D is an attenuation factor by adding one rod.

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