JP3831904B2 - Geological rock mass discrimination method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a method for discriminating formation bedrock used when drilling ground with a rotary percussion drill, for example, and in particular, it is possible to improve the discrimination accuracy of formation bedrock in a construction range widely including soft to hard ground.Geological rock mass discrimination methodIt is about.
[0002]
[Prior art]
Conventionally, when constructing underground cavities, it is extremely important to accurately evaluate and predict the formation rock in the construction area. For this reason, conventionally, various methods for discriminating formation rocks have been proposed.
[0003]
For example, in Japanese Patent Publication No. 7-49756, the ground is drilled with a hydraulic percussion drill by piston striking, the average fracture energy per unit hole length is calculated, and then the rock grade and fracture energy are calculated by a probabilistic / statistical method. A method for evaluating and predicting the formation bedrock in front of the face by performing a rock mass evaluation with fracture energy, performing image processing with a large computer, grasping the distribution state of the fracture energy, is disclosed .
[0004]
Here, the breaking energy is the energy required for the drilling of the hydraulic percussion drill, that is, the energy required to break the rock, the breaking energy is Ev, the piston striking energy is Es, and the number of piston hits is Ns. When the velocity is Vd and the digging hole cross-sectional area is Ar, it is expressed by the following equation (1).
Ev = (Es × Ns) / (Vd / Ar) (1)
[0005]
In addition, in the conventional example of the same publication, for example, in underground oil storage base construction, when drilling a water-sealed boring hole in a water-sealed tunnel construction, test drilling is performed in advance, and the fracture energy for each rock grade is By using statistical methods, the rock mass is evaluated using the fracture energy as a parameter.
[0006]
[Problems to be solved by the invention]
By the way, in the conventional drilling, a rotary percussion drill that drills the ground by applying three types of energy, ie, propulsion energy, rotational energy, and impact energy, to the tip of the drill rod is used.
[0007]
Here, also in the rotary percussion drill, it is desired to accurately evaluate and predict the formation rock in the construction range. However, when the method disclosed in Japanese Examined Patent Publication No. 7-49756 is applied to a rotary percussion drill, there is a problem that the determination accuracy of the formation rock is lowered.
[0008]
That is, in the rotary percussion drill, the contributions of the three types of energy to the drilling change according to the ground characteristics to be drilled. That is, in a relatively soft ground, the contribution of propulsion energy and rotational energy tends to increase. On the other hand, in the hard ground, the contribution degree of impact energy tends to increase.
[0009]
Therefore, the conventional method for discriminating formation rocks from limited parameters such as fracture energy (piston striking energy, number of piston hits, excavation speed, borehole cross-sectional area) is advantageous for discriminating hard ground, but rotary percussion. Since important parameters such as propulsive energy and rotational energy in the drill are not considered, it is difficult to distinguish soft ground.
[0010]
As described above, the conventional method is not suitable for the determination of the ground layer in the construction range widely including the soft ground to the hard ground.
[0011]
  The present invention has been made in view of the above, and can improve the determination accuracy of the formation rock in a construction range widely including a soft ground to a hard ground.Geological rock mass discrimination methodThe purpose is to provide.
[0012]
[Means for Solving the Problems]
  In order to achieve the above object, the invention according to claim 1 calculates the propulsive energy, rotational energy and impact energy acting on the drilling portion of the drilling device during ground drilling based on the sensor detection parameters.A step of calculating a unit volume drilling energy based on the sum of the propulsion energy, the rotational energy and the impact energy, and a correlation between the calculated unit volume drilling energy and the depth / column diagram data. A step of setting a determination criterion of the formation rock mass, and a step of determining the formation rock mass in the drilling hole in real time based on a comparison result between the driving force energy, the rotation energy and the impact energy obtained at the time of actual drilling and the determination criterion , Including.
[0013]
  According to the present invention, the propulsion energy, rotational energy and impact energy acting on the drilling portion of the drilling device during ground drilling.Calculate the unit volume drilling energy based on the sum of the rocks, and determine the formation rock mass in the drilling in real time from the comparison results of the propulsion energy, rotational energy and impact energy obtained during actual drilling and the discrimination criteria. Therefore, it is possible to improve the discrimination accuracy of the formation rock in the construction range widely including soft ground to hard ground.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, the present invention will be described with reference to the drawings.Geological rock mass discrimination methodOne embodiment will be described in detail.
[0025]
FIG. 1 is a side view showing a configuration of a drilling system 100 to which an embodiment according to the present invention is applied. The drilling system 100 shown in the figure employs the rotary percussion method described above, and the tip of the drill rod 103 (bit 104) is combined with three types of energy: rotational energy, impact energy, and propulsion energy. This is a system for forming a hole H by drilling the ground G.
[0026]
Further, the drilling system 100 has a unit volume drilling energy E determined from the sum of propulsive energy, rotational energy, and impact energy._itsBased on (or drilling energy P), it has a function of discriminating the formation rock in the construction range.
[0027]
In the drilling system 100, the base machine 101 supports the rotary percussion drill device 102 vertically. The rotary percussion drill device 102 is a rotary percussion drill device. The drill rod 103 is provided with a bit 104 as a cutting edge at the tip, and is provided on the rotary percussion drill device 102 so as to be able to advance and retract in the vertical direction.
[0028]
The drill rod 103 is advanced and retracted along the rotary percussion drill device 102 while being provided with three types of energy of propulsive force energy, rotational energy, and striking energy in combination, thereby drilling the ground G to form a hole H Form.
[0029]
The rotational drive motor 105 is a motor that rotationally drives the drill rod 103 by applying rotational energy to the drill rod 103. The water supply pump 106 is a pump for supplying water to the rotary percussion drill apparatus 102. The piston 107 gives impact energy to the drill rod 103.
[0030]
The drilling control device 108 is provided in the base machine 101 and controls each part of the rotary percussion drill device 102 during drilling work. The operation panel 109 is connected to the drilling control device 108 and is operated by an operator.
[0031]
The stratum rock discriminating apparatus 200 uses the parameters shown in FIG. 2 to generate the propulsive energy P shown in FIG._f, Rotational energy P_rAnd impact energy P_sUnit volume drilling energy E determined from drilling energy P which is the sum of_its Is a device that discriminates the formation rock in the drilling range of the rotary percussion drill device 102 in real time and displays the discrimination result, and is provided in the base machine 101.
[0032]
As shown in FIG. 3, in the geological formation rock discriminating device 200, the unit volume drilling energy E obtained by the preliminary drilling is obtained._its And the first discrimination criterion L based on the correlation between the depth / columnar data representing the condition of the formation rock according to the depth_B And the second discrimination criterion L_CIs obtained in advance.
[0033]
First discrimination criterion L_BIs a standard for discriminating between A and B of the rock type (geological bedrock). Second discrimination criterion L_CIs a standard for discriminating between B and C of rock types.
[0034]
In the formation rock mass discriminating apparatus 200, the unit volume drilling energy E during the actual drilling by the drilling system 100 is performed._its And the first discrimination criterion L_BAnd the second discrimination criterion L_C (> First discrimination criterion L_B) And the rock type (geological bedrock) are discriminated in real time from the comparison result with), and the discrimination result is displayed.
[0035]
Specifically, unit volume drilling energy E_its Is the first discrimination criterion L_BIf it is less, the rock type (geological bedrock) is identified as A. Unit volume drilling energy E_its Is the first discrimination criterion L_BThe second discrimination criterion L_C If it is less, the rock type (geological bedrock) is identified as B. Unit volume drilling energy E_its Is the second discrimination criterion L_CIn the case of the above, the rock type (geological bedrock) is determined as C.
[0036]
The softness of rock types A, B, and C is in the order of rock type A> rock type B> rock type C. That is, among the rock types A, B and C, the rock type A is the softest and the rock type C is the hardest. As can be seen from the figure, in the rotary percussion method, the propulsive energy P_f And rotational energy P_r It shows a tendency that the degree of contribution increases. On the other hand, in the hard rock type, the impact energy P_sIt shows a tendency that the degree of contribution increases.
[0037]
FIG. 2 is a diagram showing parameters used in the determination of the formation rock. In the figure, parts corresponding to the parts in FIG. In the figure, T is the rotational torque [Nm] acting on the tip (bit 104) of the drill rod 103. N_TIs the number of rotations of the drill rod 103 [times / sec]. F is a propulsive force [N] acting on the tip (bit 104) of the drill rod 103.
[0038]
S is the piston striking energy [Nm] acting on the tip (bit 104) of the drill rod 103 by striking the piston 107. N_sIs the piston hit count [times / sec] per unit time when the piston 107 hits the drill rod 103.
[0039]
dδ is the drilling length [m] by the drill rod 103. dt is a required time [sec] required for drilling the drilling length dδ. S_p(= Dδ / dt) is a drilling speed per unit time by the drill rod 103. A is the hole cross-sectional area of the hole H [m²]. r is the hole radius [m] of the hole H.
[0040]
Returning to FIG. 1, the magnetic sensor 201 is provided in the rotary percussion drill device 102, and the rotational speed N of the rotational drive motor 105 is determined._TThis is a sensor for detecting (see FIG. 2).
[0041]
The drilling length sensor 202 is provided in the rotary percussion drill device 102 and is a sensor for detecting the displacement amount of the drill rod 103, that is, the drilling length dδ (see FIG. 2). The pressure sensor 203 is provided in the base machine 101, and is a sensor that detects the propulsive force F, the rotational torque T, and the number of piston hits Ns (see FIG. 2).
[0042]
Each output data of the magnetic sensor 201, the drilling length sensor 202, and the pressure sensor 203 is input to the formation rock mass discriminating apparatus 200 as a sensor detection parameter.
[0043]
FIG. 4 is a block diagram showing a configuration of the formation rock mass discriminating apparatus 200 shown in FIG. In the figure, parts corresponding to the parts in FIG. The input / output interface 206 shown in the figure is an input / output interface between each part in the formation rock discriminating apparatus 200 and the magnetic sensor 201, drilling length sensor 202, pressure sensor 203, input unit 204, and display unit 205. .
[0044]
The magnetic sensor 201, the drilling length sensor 202, and the pressure sensor 203 (see FIG. 1) have the above-described rotational speed N._T, Drilling length dδ, propulsive force F, rotational torque T and number of piston hits N_sThe sensor detection parameter data is output to the input / output interface 206.
[0045]
The input unit 204 is used for inputting various data. The display unit 205 is an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube), or the like for displaying a determination result (see FIG. 3) of the formation rock in real time.
[0046]
The control unit 207 controls each part of the formation rock discriminating apparatus 200. The propulsive force energy calculation unit 208 acquires each parameter via the input / output interface 206, and based on a calculation formula described later, the propulsion acting on the tip (bit 104) of the drill rod 103 (see FIGS. 1 and 2). Calculate the force energy.
[0047]
The rotational energy calculation unit 209 acquires each parameter via the input / output interface 206, and based on the calculation formula described later, the rotational energy acting on the tip (bit 104) of the drill rod 103 (see FIGS. 1 and 2). Is calculated.
[0048]
The striking energy calculation unit 210 acquires each parameter via the input / output interface 206, and the striking energy acting on the tip (bit 104) of the drill rod 103 (see FIGS. 1 and 2) based on a calculation formula described later. Is calculated.
[0049]
The drilling energy calculation unit 211 is based on a calculation formula described later from the propulsion energy, the rotation energy, and the impact energy calculated by the propulsion energy calculation unit 208, the rotation energy calculation unit 209, and the impact energy calculation unit 210, respectively. Calculate the drilling energy.
[0050]
As described above, the discrimination criterion setting unit 212 uses the first discrimination criterion L based on the correlation between the drilling energy obtained by the preliminary survey drilling and the depth / column diagram data._B And the second discrimination criterion L_C(Refer to FIG. 3) is obtained, and this is set in the formation rock mass discriminating unit 213.
[0051]
As shown in FIG. 3, the formation rock mass discriminating unit 213 performs the drilling energy during the actual drilling with the drilling system 100 and the first discrimination criterion L._BAnd the second discrimination criterion L_C The rock type (geological bedrock) is discriminated in real time from the comparison result and the discrimination result is displayed on the display unit 205.
[0052]
The investigation energy data storage unit 220 stores investigation energy data related to energy (propulsion energy, rotational energy, impact energy, and drilling energy) calculated for investigation when setting the discrimination criterion.
[0053]
The depth / column diagram data storage unit 230 stores depth / column diagram data created for investigation. The formation rock discriminating data storage unit 240 stores the formation rock discriminating data that is the discrimination result of the formation rock discriminating unit 213.
[0054]
Next, the operation of the embodiment will be described with reference to the flowcharts shown in FIGS. In step SA1 shown in FIG. 5, the survey drilling is performed, and the discrimination criterion of the formation rock, that is, the first discrimination criterion L_B And the second discrimination criterion L_C Is set in the formation bedrock discriminating unit 213.
[0055]
Specifically, in step SB1 shown in FIG. 6, a hole radius r, piston striking energy S, and hole cross-sectional area A (all fixed values) are input from the input unit 204 as parameters. As a result, the hole radius r is initially set in the rotational energy calculation unit 209. The impact energy calculation unit 210 is initially set with the piston impact energy S. Further, the hole cross-sectional area A is initially set in the drilling energy calculation unit 211.
[0056]
Thereafter, the drilling system 100 investigates and drills, and sensor detection parameter data is output from the magnetic sensor 201, the drilling length sensor 202, and the pressure sensor 203 to the formation rock discriminating apparatus 200. In the survey drilling, depth / column diagram data is created by core sampling or the like.
[0057]
In step SB2, the propulsive force energy calculating unit 208, the rotational energy calculating unit 209, the impact energy calculating unit 210, and the drilling energy calculating unit 211 are respectively investigated by the magnetic sensor 201, the drilling length sensor 202, and the pressure sensor 203. Sensor detection parameter (rotation speed N_T , Drilling length dδ, propulsive force F, rotational torque T and number of piston hits N_s ) To get.
[0058]
In step SB3, the propulsive energy calculating unit 208 calculates the propulsive energy for investigation based on each parameter. Specifically, the propulsive energy calculating unit 208 substitutes the propulsive force F, the drilling length dδ, and the required time dt into the following equation (2) to thereby generate the propulsive energy P per unit time._fIs calculated.
[0059]
P_f = F × dδ / dt [Nm / sec] (2)
[0060]
Here, dδ / dt in equation (2) is the drilling speed S_p(See FIG. 2), the expression (2) is expressed by the following expression (3).
[0061]
P_f = F x S_p[Nm / sec] (3)
[0062]
In step SB4, the rotational energy calculation unit 209 calculates the rotational energy for investigation based on each parameter. Specifically, the rotational energy calculation unit 209 calculates the rotational torque T, the hole radius r, and the rotational speed N according to the following equation (4)._TIs substituted for the rotational energy P per unit time._rIs calculated.
[0063]
P_r = (T / r) × 2πr × N_T
= 2π × T × N_T [Nm / sec] (4)
[0064]
In step SB5, the batting energy calculation unit 210 calculates batting energy for investigation based on each parameter. Specifically, the striking energy calculation unit 210 calculates the piston striking energy S and the number of piston striking times N according to the following equation (5)._sBy substituting, the impact energy P per unit time_s Is calculated.
P_s = S × N_s [Nm / sec] (5)
[0065]
In step SB6, the drilling energy calculation unit 211 uses the propulsive force energy P calculated by the propulsion energy calculation unit 208, the rotational energy calculation unit 209, and the impact energy calculation unit 210._f , Rotational energy P_r And impact energy P_s Is substituted into the following equation (6) to calculate the drilling energy P per unit time.
[0066]
P = P_f + P_r + P_s [Nm / sec] (6)
[0067]
Next, the drilling energy calculation unit 211 has a unit volume drilling energy E required to drill a unit volume of ground._itsIs calculated. Here, unit volume drilling energy E_its Is expressed by the following equation (7), where P (refer to equation (6)) is the drilling energy per unit time and dV / dt is the excavation volume per unit time.
[0068]
E_its = P / (dV / dt) (7)
[0069]
Here, the drilling energy P shown in Formula (7) is expressed by Formulas (3) to (6), and (dV / dt) is expressed by the hole cross-sectional area A and the drilling speed S._p(7) is transformed into the following (8).
[0070]
E_its = ((F × S_p) + (2π × T × N_T ) + (S × N_s )) / (A × S_p(8)
[0071]
The drilling energy calculation unit 211 includes a propulsive force F and a drilling speed S._p , Rotational torque T, rotational speed N_T , Piston striking energy S, Piston hit count N_s, Hole cross-sectional area A, drilling speed S_p By substituting these parameters into equation (8), unit volume drilling energy E_its Is calculated.
[0072]
In step SB7, the control unit 207 calculates the propulsive force energy P calculated by the propulsive force energy calculation unit 208, the rotational energy calculation unit 209, the impact energy calculation unit 210, and the drilling energy calculation unit 211, respectively._f , Rotational energy P_r , Impact energy P_s , Drilling energy P and unit volume drilling energy E_its Are stored in the energy data storage unit 220 for investigation as energy data for investigation in association with the depth. The depth corresponds to the drilling length dδ.
[0073]
In step SB8, it is determined whether or not the survey drilling has been completed. In this case, the determination result is “No”.
[0074]
Thereafter, until the result of the determination in step SB8 is “Yes”, the survey drilling proceeds, and steps SB2 to SB7 are repeatedly executed. Thus, the survey energy data storage unit 220 sequentially stores the survey energy data in association with the depth. In addition, as the drilling progresses, depth / column diagram data is also created sequentially.
[0075]
When the determination result in step SB8 is “Yes”, in step SB9, the control unit 207 acquires the created depth / column diagram data via the input unit 204 and the input / output interface 206. In step SB10, the control unit 207 stores the depth / column diagram data in the depth / column diagram data storage unit 230.
[0076]
In step SB11, the discrimination criterion setting unit 212 converts the unit volume drilling energy E as the survey energy data from the survey energy data storage unit 220._its And the depth / columnar data are acquired from the depth / columnar data storage unit 230.
[0077]
Next, as shown in FIG. 3, the discrimination criterion setting unit 212 performs unit volume drilling energy E_itsAnd the correlation between the depth / column diagram data and the first criterion C as the criterion_B And the second discrimination criterion L_C Ask for.
[0078]
In step SB12, the discrimination criterion setting unit 212 uses the first discrimination criterion L._B And the second discrimination criterion L_C Is set in the formation rock mass discriminating unit 213. Thereby, a series of determination standard setting processes is completed.
[0079]
In step SA2 shown in FIG. 5, drilling from depth 0 by the drilling system 100 is started, and the first discrimination criterion L set in the discrimination criterion setting process is started._B And the second discrimination criterion L_C Based on the above, the formation rock discriminating process for actually discriminating the formation rock is executed.
[0080]
Specifically, in step SC1 shown in FIG. 7, the propulsive force energy calculation unit 208, the rotational energy calculation unit 209, the striking energy calculation unit 210, and the drilling energy calculation unit 211 respectively include the magnetic sensor 201 and the drilling length. Sensor detection parameters (number of rotations N) for discrimination from the sensor 202 and the pressure sensor 203_T , Drilling length dδ, propulsive force F, rotational torque T and number of piston hits N_s ) To get.
[0081]
In step SC2, the propulsive force energy calculating unit 208 substitutes the propulsive force F, the drilling length dδ, and the required time dt into the above-described equation (2), thereby determining the propulsive force energy P for discrimination per unit time._fIs calculated.
[0082]
In step SC3, the rotational energy calculation unit 209 adds the rotational torque T, the hole radius r, and the rotational speed N to the above-described equation (4)._TIs substituted for rotational energy P for discrimination per unit time._rIs calculated.
[0083]
In step SC4, the striking energy calculation unit 210 calculates the piston striking energy S and the number of piston striking times N according to the above-described equation (5)._sBy substituting, the impact energy P for discrimination per unit time_s Is calculated.
[0084]
In step SC <b> 5, the drilling energy calculation unit 211 includes the propulsion energy P calculated by the propulsion energy calculation unit 208, the rotational energy calculation unit 209, and the impact energy calculation unit 210._f , Rotational energy P_r And impact energy P_s From (6) to (8), unit volume drilling energy E for discrimination per unit time_its Is calculated.
[0085]
In step SC6, the formation rock mass discriminating unit 213 performs unit volume drilling energy E as shown in FIG._its And the first discrimination criterion L_B And the second discrimination criterion L_C The rock type (geological bedrock) is discriminated from the comparison result with the results, and the discrimination result is used as the geological rock mass discrimination data.
[0086]
In one embodiment, after the drilling energy P is obtained from the above-described equation (6) by the drilling energy calculating unit 211, the formation rock mass discriminating unit 213 compares the drilling energy P with the discrimination standard. Geological rocks may be identified.
[0087]
In step SC7, the formation rock mass discrimination unit 213 displays the formation rock mass discrimination data on the display unit 205 in real time via the input / output interface 206 as shown in FIG.
[0088]
In step SC <b> 8, the formation rock mass discrimination unit 213 stores the formation rock mass discrimination data in the formation rock mass discrimination data storage unit 240. In step SC9, it is determined whether or not the drilling has been completed. In this case, the determination result is “No”.
[0089]
Thereafter, the drilling proceeds until the determination result in step SC9 becomes “Yes”, and steps SC1 to SC8 are repeatedly executed. As a result, as shown in FIG. 3, the display unit 205 displays the rock type discrimination result (geologic rock discriminating data) according to the depth in real time, and the formation rock mass discriminating data storage unit 240 displays the formation rock mass. The discrimination data is stored sequentially.
[0090]
And if the judgment result of step SC9 becomes "Yes", a series of formation rock mass discrimination processing will be completed.
[0091]
Moreover, in one embodiment, the geological rock discriminating apparatus 200 shown in FIGS. 1 and 2 may be applied to the ground improvement and applied to the discrimination between the improvement target ground and the healthy ground. FIG. 8 is a flowchart for explaining the operation when the geological formation rock discriminating apparatus 200 is applied to ground improvement.
[0092]
In step SD1 shown in the figure, before the ground improvement, for the ground range including the ground to be improved and the healthy ground, the discrimination reference setting process (before the ground improvement) is performed in the same manner as the discrimination reference setting process shown in FIG. Is executed. Accordingly, the first discrimination criterion L for discriminating the improvement target ground, the healthy ground, etc._B And the second discrimination criterion L_C Is set in the formation rock discriminating unit 213.
[0093]
In step SD2, before the ground improvement, a formation rock discriminating process (before the ground improvement) is executed in the same manner as the formation rock discriminating process shown in FIG. 7 for the ground range including the improvement target ground and the healthy ground. As a result, the ground area is actually drilled by the drilling system 100, and the drilling energy and the first discrimination criterion L_B And the second discrimination criterion L_C Based on the comparison result, the improvement target ground, the healthy ground, etc. are discriminated in real time.
[0094]
In step SD3, ground improvement for making the improvement target ground into a sound ground is performed based on the determination result.
[0095]
In step SD4, in order to confirm the effect of the ground improvement, after the ground improvement, the formation rock discriminating process (after the ground improvement) is executed in the same range as in the formation rock discriminating process shown in FIG. .
[0096]
As a result, the ground area is actually drilled by the drilling system 100, and the drilling energy and the first discrimination criterion L_B And the second discrimination criterion L_C Based on the comparison result, the determination is performed in real time. And the effect of ground improvement is easily grasped | ascertained by comparing the determination result in step SD2 with the determination result in step SD4.
[0097]
In one embodiment, the formation rock discriminating unit 213 may compare and display the discrimination result before the ground improvement at step SD2 and the discrimination result after the ground improvement at step SD4 on the display unit 205. .
[0098]
As described above, according to one embodiment, there are three types of propulsion energy, rotational energy and impact energy acting on the tip (bit 104) of the drill rod 103 by the rotary percussion method during ground drilling. The energy (drilling energy) is calculated, and as shown in FIG. 3, the unit volume drilling energy E based on the sum of the propulsion energy, rotational energy and impact energy obtained during actual drilling is calculated._its And the discrimination criterion (the first discrimination criterion L_B , Second discrimination criterion L_C ), The formation bedrock in the drilling hole is discriminated in real time, so that the discrimination accuracy of the formation bedrock in the construction range that covers a wide range from soft to hard ground can be increased.
[0099]
Moreover, according to one embodiment, as described with reference to FIG. 8, it is based on the sum of propulsion energy, rotational energy and impact energy acting on the drilling portion of the drilling device during ground drilling. Unit volume drilling energy E_its The unit volume drilling energy E based on the propulsive energy, rotational energy and impact energy obtained during actual drilling before ground improvement_its And the discrimination criterion (the first discrimination criterion L_B , Second discrimination criterion L_C From the comparison results with), the formation rock in the drilling is identified in real time, and after the ground improvement, the formation rock in the drilling is determined in real time. It is possible to increase the accuracy of discriminating formation rocks (for example, improvement target grounds and sound grounds) in a wide construction range.
[0100]
In addition, according to the embodiment, the determination result before the ground improvement and the determination result after the ground improvement are compared and displayed on the display unit 205, so that the effect of the ground improvement can be easily grasped.
[0101]
Although one embodiment of the present invention has been described in detail with reference to the drawings, a specific configuration example is not limited to this one embodiment, and the design can be changed without departing from the gist of the present invention. And the like are included in the present invention.
[0102]
For example, in the above-described embodiment, a program for realizing the function of the formation rock discriminating apparatus 200 is recorded on the computer-readable recording medium 400 shown in FIG. Each function may be realized by causing the computer 300 shown in the figure to read and execute the program.
[0103]
A computer 300 shown in the figure includes a CPU (Central Processing Unit) 310 that executes the above-described program, an input device 320 such as a keyboard and a mouse, a ROM (Read Only Memory) 330 that stores various data, an operation parameter, and the like. RAM (Random Access Memory) 340, a reading device 350 for reading a program from the recording medium 400, an output device 360 such as a display and a printer, and a bus 370 for connecting each part of the device.
[0104]
The CPU 310 implements the above-described functions by reading a program recorded on the recording medium 400 via the reading device 350 and then executing the program. Examples of the recording medium 400 include an optical disk, a flexible disk, and a hard disk.
[0105]
【The invention's effect】
  As explained above,According to the present invention,Unit volume drilling energy is calculated based on the sum of propulsive energy, rotational energy and impact energy acting on the drilling part of the drilling device during ground drilling, and propulsion energy obtained during actual drilling, Because it was decided to discriminate the formation rock in the drilling hole in real time from the comparison result of the rotational energy and impact energy and the discrimination criteria.In addition, it is possible to increase the accuracy of discriminating formation rocks in a construction range that includes a wide range from soft ground to hard ground.
[Brief description of the drawings]
FIG. 1 is a side view showing a configuration of a drilling system 100 to which an embodiment according to the present invention is applied.
FIG. 2 is a diagram showing parameters used in the same embodiment.
FIG. 3 is a diagram for explaining a formation rock mass discriminating method in the same embodiment.
4 is a block diagram showing a configuration of the formation rock mass discriminating apparatus 200 shown in FIG. 1; FIG.
FIG. 5 is a flowchart for explaining the operation of the same embodiment;
6 is a flowchart for explaining the discrimination criterion setting process shown in FIGS. 5 and 8. FIG.
FIG. 7 is a flowchart for explaining the formation rock formation determination process shown in FIGS. 5 and 8;
FIG. 8 is a flowchart for explaining an operation when the formation rock mass discriminating apparatus 200 shown in FIGS. 1 and 4 is applied to ground improvement.
FIG. 9 is a block diagram showing a configuration of a modified example of the same embodiment.
[Explanation of symbols]
100 drilling system
102 Rotary percussion drill equipment
103 Drill rod
104 bits
105 Rotation drive motor
108 Drilling control device
200 Geological rock discriminator
201 Magnetic sensor
202 Drilling length sensor
203 Pressure sensor
204 Input section
205 display
207 Control unit
208 Propulsion energy calculation unit
209 Rotational energy calculation unit
210 Impact energy calculation unit
211 Drilling energy calculation unit
212 Discrimination standard setting part
213 Geological rock mass discrimination part
220 Energy data storage for investigation
230 Depth / column diagram data storage
240 Geological rock discriminating data storage section

Claims (1)

A step of calculating the propulsive force energy, rotational energy and impact energy acting on the drilling portion of the drilling device at the time of ground drilling based on the sensor detection parameters;
Calculating unit volume drilling energy based on the sum of the propulsion energy, the rotational energy and the impact energy ;
A step of setting a criterion for formation rock formation based on a correlation between the calculated unit volume drilling energy and depth / columnar data ;
A step of discriminating the formation rock mass in the drilling hole in real time from the comparison result of the propulsive energy, rotational energy and impact energy obtained at the time of actual drilling and the discrimination criterion;
A method for discriminating formation rocks, comprising:

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