JP4075980B2 - Evaluation method of natural mountain by drilling data in mountain tunnel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for evaluating a natural ground based on drilling data in a mountain tunnel for evaluating a natural ground by measuring the drilling speed and various loads of the drilling machine when performing a drilling operation with a hydraulic jumbo type drilling machine.
[0002]
[Prior art]
Conventionally, when excavating underground cavities such as tunnels, it has been said that it is extremely important to accurately evaluate and predict the geology in front of the face or around the cavity.
[0003]
Therefore, using the drilling data obtained by the test drilling of the hydraulic percussion drill, the rock mass evaluation and the geology ahead of the face are predicted more quickly and accurately according to the original position without hindering the progress of the construction. An invention of Japanese Patent Publication No. 7-49756 relating to a rock evaluation using a drilling data by a hydraulic drill capable of predicting and a method of predicting the geology ahead of the face is known.
[0004]
This known invention is a method of drilling holes 30m to 50m perpendicular to the face, measuring the energy required at that time, and evaluating the hardness of the natural ground in front of the face. In addition, it is necessary to perforate the front and both the 30m and 50m rods are drilled for drilling, so the energy required for rotation, feeding and striking with the rod mounted without drilling is grasped. There is a problem that the obtained value is not only for natural mountains. That is, even if it is attempted to measure the energy required for rotation, feeding and striking in the air with a 30 to 50 m rod attached, the rod will sag and cannot be measured.
[0005]
Moreover, in the above invention, only the degree of hardness of the natural ground can be judged, whether the natural ground and the rock fragment are soft or hard, or crushed, or whether it wraps around a bit or rod like clay, etc. However, it is impossible to judge the condition of the tunnel, and it cannot be used as a material for determining the type of support for the tunnel that has been drilled.
[0006]
[Problems to be solved by the invention]
The present invention is a mountain tunnel that can be used as an index for determining the structure of a supporting work that can be compared with a partially weak part of a drilled ground and the situation of a past face in the tunnel. A method for evaluating natural ground using drilling data is provided.
[0007]
[Means for Solving the Problems]
The present invention sets the percussion pressure and the maximum feed pressure of the drilling machine according to the nature of the natural ground to be drilled, and sets the drilling machine equipped with a predetermined rod and bit to the lower half, the side wall, the shoulder, and the ceiling. For each of these, while striking with the impact pressure set in the no-load state, feed the drilling machine at multiple possible drilling speeds, measure the rotational pressure and feed pressure of the drilling machine, and obtain the obtained data. Summarize the guide shell angle, set the rotation pressure and feed pressure in the no-load state, and then measure the drilling length, drilling speed, impact pressure, rotational pressure, and feed pressure of the drilling machine when drilling the ground with the drilling machine Drilling in a mountain tunnel that evaluates the corrected rotational pressure and feed pressure by subtracting the rotational pressure and feed pressure in the unloaded state corresponding to the drilled guide shell angle from the measured rotational pressure and feed pressure. To data In the evaluation method that the natural ground, if the evaluation in the same working face, excluding the data in the vicinity of and end near the beginning of the perforations, each perforation in the same working face, percussion pressure, drilling speed, rotation pressure after correction and The corrected feed pressure is averaged, the corrected rotation pressure per drilling speed and the corrected feed pressure per drilling speed are plotted on the coordinate axes, and the values obtained from the average value for each drilling are plotted. It consists of an evaluation method of natural ground by drilling data in a mountain tunnel that evaluates whether there is a different drilling, and the present invention further provides an evaluation method for each face when evaluating the natural ground . after calculating the feed pressure corrected per drilling speed and the rotation pressure after correction per drilling speed for each drilling length, the average value of the rotation pressure after correction per perforation rate and the standard deviation and the drilling speed equivalent Obtain the average value and standard deviation of the feed pressure after correction, plot the corrected rotation pressure per drilling speed and the corrected feed pressure per drilling speed on the coordinate axes, and plot the average value and standard deviation for each face. It consists of a method for evaluating natural ground by drilling data in a mountain tunnel that evaluates the tendency of each face.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
1 is a side view of an embodiment of a hydraulic jumbo type drilling machine 1 for drilling in a mountain tunnel according to the present invention. It is equipped with a guide shell 3 that holds a drifter 2. A guide slide operation detection pressure switch 4, a feed length L and a speed detection oil amount sensor 5 are provided on the machine body, and a control box 6 and a lower part of the machine body. A hydraulic pressure detection sensor 7 for detecting the impact pressure, the rotational pressure and the feed pressure, a recording device 8 such as a notebook personal computer, and a recording device cradle 9 are provided.
[0009]
Therefore, in the present invention, the percussion pressure and the maximum feed pressure of the drilling machine 1 are set according to the nature of the natural ground from past experience before performing the drilling operation.
[0010]
Next, a predetermined rod and bit are attached to the drifter 2 in the drilling machine 1, and the angle of the guide shell 3 of the drilling machine 1 is set to, for example, −15 ° so as to face the lower half, the side wall, the shoulder, and the ceiling. While changing each angle of 0 °, 45 °, and 90 °, the characteristics of the natural ground while striking in the blanking state with the impact pressure set above in an unloaded state where no natural ground is dug. From a plurality of perforation speeds, for example, 1.0 m / min. 2.0 m / min. 3.0 m / min. Is fed to the punch 1 and the rotational pressure and feed pressure of the punch 1 are measured.
[0011]
The data obtained by the measurement is collected according to the angles of the guide shell 3 of −15 °, 0 °, 45 °, and 90 °, and the rotational pressure and feed pressure in the no-load state are measured.
[0012]
The measurement results measured above are shown in the table of guide shell angle and drilling speed in FIG. 2, and the feed pressure correction value and the rotation pressure correction value shown in the table are obtained as shown in FIG.
[0013]
Next, 15 holes are drilled in each face section of the natural ground with the drilling machine 1, and the data obtained by measuring the drilling length, drilling speed, impact pressure, rotational pressure, and feed pressure of the drilling machine 1 for each hole are obtained. FIG. 3A shows the original data.
[0014]
The correction values of the rotational pressure and feed pressure in the no-load state corresponding to the angle of the drilled guide shell 3 shown in FIG. 2 are subtracted from the measured rotational pressure and feed pressure of the original data in (A) above. The corrected rotation pressure and feed pressure after the data correction shown in 3 (B) are used.
[0015]
In addition, in the original data of FIG. 3 above, the portion affected by drilling of shotcrete, for example, the portion near the start of drilling with a spray thickness of +5 cm, and the portion affected by the end of drilling, for example, near the end of the drilling length of −10 cm The above data excludes the range indicated by D and averages the impact pressure, drilling speed, corrected rotational pressure and corrected feed pressure for each drilling of the same face, and the corrected rotation per drilling speed. The values obtained from the average value for each perforation are plotted taking the pressure and the corrected feed pressure per perforation speed as coordinates, and indicate whether there are perforations with different tendencies.
[0016]
That is, in the average value processing of the drilling data, the drilling speed is V, the impact pressure is P _p , the corrected rotational pressure is Pr-Pr O, and the corrected feed pressure is Pf-Pf O. In FIG. 3, (Pr-PrO) / V, that is, a drilling speed of 1 m / min. The average net rotational pressure of the perforator 1 per unit is 23.8, and (Pf-PfO) / V, that is, the perforation speed is 1 mm / min. The average net feed pressure of the perforating machine 1 is 10.5.
[0017]
In addition, it is confirmed whether the average value of said striking pressure is not different from the set value.
[0018]
Therefore, the individual evaluation on the same face is shown in the coordinates of (Pr-PrO) / V on the vertical axis and (Pf-PfO) / V on the horizontal axis in FIG. This is a plot of the values obtained from two groups of the same face of a natural mountain 2m away from the point of 1.9m and 3.9m.
[0019]
Here, the coordinates with (Pr−PrO) / V on the vertical axis and (Pf−PfO) / V on the horizontal axis are divided into four regions A, B, C, and D as shown in FIG. The characteristics of each region are described below. Since the feed pressure and the rotational pressure are small in the region A, the ground and the rocks drilled are soft, and in the region B, the feed pressure is large and the rotational pressure is small. The ground is hard, but the drilled rock fragments are soft and finely crushed. In the region C, both the feed pressure and the rotational pressure are large, so the ground rock and the drilled rock fragments are hard, or the rock fragments are largely crushed. In the D region, the feed pressure is small and the rotational pressure is large, so the ground is soft, but the rock is hard, or it is wrapped around a bit or rod like clay.
[0020]
In FIG. 4, (Pf−PfO) / V of the shoulder B of 209 + 1.9 is smaller than the others. This means that there are some soft inclusions and weathering zones that are different from others.
[0021]
However, since the value of (Pr-PrO) / V is almost the same in the two groups of the same face, it can be seen that the hardness of the crushed rock mass is the same as the others.
[0022]
Next, when evaluating each face, after calculating the corrected rotational pressure per piercing speed and the corrected feed pressure per piercing speed for each data of all data on the same face, The average value and standard deviation of the corrected rotational pressure (Pr-PrO) / V and the average value and standard deviation of the corrected feed pressure per punching speed (Pf-PfO) / V are obtained. The corrected rotation pressure and the corrected feed pressure per piercing speed are plotted on the coordinate axes, and the average value and standard deviation are plotted for each face to evaluate the tendency for each face.
[0023]
FIG. 6 shows (Pr-PrO) / V and (Pf-PfO) / V for each data of 209m + 1.9, and shows a part of the situation where the average value and standard deviation are calculated. FIG. 7 shows the results in terms of (Pr-PrO) / V on the vertical axis and (Pf-PfO) / V on the horizontal axis.
[0024]
In FIG. 8 , the average value is shown in a circle within the standard deviation frame with the comparison of the overall evaluation at each face as coordinates. In the figure, 209 + 1.9 series 2 A ground and 209 + 3.9 series 4 B is a natural ground of the same degree. Compared with this, C of 209 + 88.5 series 6 and D of 209 + 90.0 series 8 are hard ground and the rock mass is hard.
[0025]
Further, D of 209 + 90.0 series 8 has a wide area compared to C of 209 + 88.5 series 6, so that it is hard as a whole, but it is a ground that repeats hardness and softness in the rock mass.
[0026]
【The invention's effect】
According to the evaluation method of the natural ground by the drilling data in the mountain tunnel according to the present invention described above, since it can be compared with the partially weak part of the drilled natural mountain, the situation of the past face in the tunnel, It can be used as an index for determining the structure of the support work provided.
[0027]
In addition, the present invention is, for example, a state where the ground is soft in some areas, the ground is soft, and in other areas, the ground is hard, but the rock is soft and finely crushed, and other areas are ground. Because the mountain and rock fragments are hard, or the rock fragments are largely crushed, and in other areas the ground mountain is soft, but the rock fragments are hard, or it can be judged that it is wrapped around a bit or rod like clay Materials are available to determine the optimal support type.
[Brief description of the drawings]
FIG. 1 is a side view of an embodiment of a drilling machine for drilling a mountain tunnel according to the present invention.
FIG. 2 is a table showing measurement results of pressure measurement in the no-load state in the evaluation method of the present invention, and correction values for feed pressure and rotational pressure.
3 is a chart showing original data measured by drilling a natural ground by the evaluation method of the present invention and correction data obtained by correcting the original data with the correction values shown in FIG.
FIG. 4 is a chart showing coordinates of individual evaluation examples in the same face according to the present invention.
FIG. 5 is a chart showing four regions of coordinates according to the present invention with (Pr-PrO) / V on the vertical axis and (Pf-PfO) / V on the horizontal axis.
FIG. 6 calculates (Pr-PrO) / V and (Pf-PfO) / V for each data when performing overall evaluation on each face in the evaluation method of the present invention, and calculates the average value and standard deviation of each. It is a chart which shows a part of the calculated situation.
7 is a chart showing the results of FIG. 6 in the evaluation method according to the present invention in coordinates.
FIG. 8 is a chart showing coordinates of a comparative example of overall evaluation for each face according to the present invention.
[Explanation of symbols]
1 Drilling machine 3 Guide shell

Claims (2)

Set the percussion pressure and maximum feed pressure of the drilling machine according to the nature of the natural ground to be drilled, and point the drilling machine equipped with the prescribed rod and bit toward the lower half, side wall, shoulder, and ceiling, While striking with the impact pressure set in the no-load state, feed to the drilling machine at multiple possible drilling speeds, measure the rotational pressure and feed pressure of the drilling machine, and use the obtained data as the guide shell angle. In summary, after setting the rotational pressure and feed pressure in the no-load state, measure the drilling length, drilling speed, impact pressure, rotational pressure, and feed pressure of the drilling machine when drilling the ground with the drilling machine, and measure the measurement By subtracting the rotational pressure and feed pressure in the unloaded state corresponding to the drilled guide shell angle from the measured rotational pressure and feed pressure, the ground pressure based on the drilling data in the mountain tunnel is evaluated as the corrected rotational pressure and feed pressure. of In valence method, if the evaluation in the same working face, excluding the data in the vicinity of and end near the beginning of the perforations, each perforation in the same working face, percussion pressure, drilling speed, rotation pressure and feed the corrected after the correction There are drills with different tendencies by averaging the pressure, plotting the corrected rotation pressure per drilling speed and the corrected feed pressure per drilling speed on the coordinate axes, and plotting the value obtained from the average value for each drilling. A method for evaluating natural ground by drilling data in a mountain tunnel. Set the impact pressure and maximum feed pressure of the drilling machine according to the nature of the natural ground to drill, and point the drilling machine equipped with the predetermined rod and bit toward the lower half, side wall, shoulder, and ceiling, While striking with the impact pressure set in an unloaded condition, feed the drilling machine at multiple possible drilling speeds, measure the rotational pressure and feed pressure of the drilling machine, and use the obtained data as the guide shell angle. In summary, after setting the rotational pressure and feed pressure in the no-load state, measure the drilling length, drilling speed, impact pressure, rotational pressure, and feed pressure of the drilling machine when drilling the ground with the drilling machine, and measure the measurement By subtracting the rotation pressure and feed pressure in the unloaded state corresponding to the drilled guide shell angle from the measured rotation pressure and feed pressure, it is evaluated as the corrected rotation pressure and feed pressure. of In the evaluation method, when evaluating each face, after calculating the corrected rotational pressure per piercing speed and the corrected feed pressure per piercing speed for each piercing length in each face, The average value and standard deviation of the rotational pressure and the average value and standard deviation of the corrected feed pressure per piercing speed are obtained, and the corrected rotational pressure per piercing speed and the corrected feed pressure per piercing speed are coordinate axes. In the meantime, the average value and standard deviation are plotted for each face, and the tendency of each face is evaluated, and the evaluation method of the natural ground by the drilling data in the mountain tunnel.

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