CN104807541A - Measurement method of vibration speed at specific position in surrounding rock - Google Patents

Abstract

The invention discloses a method for measuring vibration velocity at a specific position inside surrounding rock. Including the measurement hole (1), the gel material (2) is poured at the bottom of the measurement hole (1), and the sensor (C1) is closely connected with the gel material (2); the boundary layer (5) is arranged on the adjacent gel Between the materials (2), the upper and lower layers of cementitious materials are prevented from solidifying into one; the data line (3-1) is connected to the sensor (C1) and is led out from the measurement hole (1), and arranged in the locking device (6); The data line (3-1) is connected with the data acquisition device to measure the vibration velocity. The invention also discloses a specific measurement method when measuring the vibration velocity at a specific position inside the surrounding rock. The advantage of the present invention is that it solves the problem that data related to the vibration velocity at a specific location inside the surrounding rock cannot be obtained during geotechnical engineering operations, especially in underground engineering blasting operations, thereby providing a basis for evaluating the degree of influence of geotechnical engineering operations on underground pipelines and facilities. Favorable value.

Description

A method for measuring vibration velocity at a specific position inside surrounding rock

technical field

The invention relates to a method for measuring vibration velocity at a specific position inside surrounding rock, and relates to the field of geotechnical engineering, in particular to the field of underground engineering blasting.

Background technique

The method of monitoring blasting vibration parameters in the engineering field is to use a sensor that matches the data acquisition device to collect the vibration signal generated by the blasting, the device host analyzes and stores the signal, calculates the amplitude and other information generated by the blasting vibration, and then The data is imported into the computer and analyzed with professional analysis software to obtain the blasting vibration parameters at specific locations. Blasting vibration parameters include vibration frequency, vibration velocity and vibration acceleration.

At present, in geotechnical engineering, the measurement of blasting vibration velocity is limited to the surface, and only the vibration parameters of the surface particles can be obtained, and the vibration parameters inside the surrounding rock cannot be obtained. Because blasting vibration will have adverse effects on the safety of underground pipelines and facilities, it is often impossible to make an accurate and objective evaluation due to the lack of vibration monitoring data at the location of underground pipelines when evaluating this impact. In terms of basic research on blasting vibration, it is also urgent to understand the parameters of blasting vibration at different depths inside the surrounding rock. Therefore, a convenient and effective measurement method is needed to obtain the blasting vibration parameters inside the surrounding rock.

In the field of geotechnical engineering, for existing technologies closely related to the present invention, please refer to a patented technology disclosed in Chinese Patent No.: 201310466050.4 entitled "Coal and Rock Mass Stress Directional Monitoring Method and Device". This technology mainly uses cylinder pressure sensors arranged in the borehole, and after injecting oil to make it under pressure, the piston induction plate and the coal rock mass can achieve a good coupling effect, and monitor the internal horizontal and vertical to the horizontal direction of the coal rock mass. Stress size and change. However, there is a lack of monitoring of the vibration velocity inside the surrounding rock.

Contents of the invention

The invention provides a method for measuring the vibration velocity at a specific position inside the surrounding rock in the field of geotechnical engineering, especially a method for measuring the vibration velocity at a specific position inside the surrounding rock caused by underground engineering blasting, which solves the problem of measuring the vibration velocity It is a technical problem that the vibration velocity of a specific position inside the surrounding rock cannot be obtained only if it is only performed on the surface.

In order to solve the problems of the technologies described above, the present invention is achieved through the following steps:

Step 1. Drilling the measurement hole 1 from the surface of the surrounding rock downwards towards the interior of the surrounding rock to the measurement depth L;

Step 2, pouring the cementitious material 2 into the bottom of the hole;

Step 3. Lower the sensor C1 from the orifice to the cementitious material 2, adjust the state of the sensor C1 with a gun stick and make the state of the sensor C1 meet the working requirements of the sensor C1; connect the data line 3-1 connected to the sensor C1 along the The measuring hole 1 leads to the outside of the orifice;

Step 4: Continue to pour the gelling material 2 into the hole, and make the sensor C1 tightly glued together with the hole wall 4 of the measuring hole 1 through the gelling material 2, and record the arrangement depth L1 of the sensor C1;

Step 5, after the gelling material 2 is initially solidified, a soft material is arranged in the hole to form a boundary layer 5;

Step 6, pouring the gelling material 2 into the upper part of the boundary layer 5 in the hole;

Step 7. Lower the sensor C2 from the orifice to the cementitious material 2, use the gun stick to adjust the state of the sensor C2 and make the state of the sensor C2 meet the working requirements of the sensor C2; connect the data line 3-2 connected to the sensor C2 along the Measuring hole 1 leads to the outside of the orifice;

Step 8, continue pouring the gelling material 2 into the hole, and make the sensor C2 tightly glued together with the hole wall 4 of the measuring hole 1 through the gelling material 2, and record the arrangement depth L2 of the sensor C2;

Step 9: After the cementitious material 2 is initially solidified, a soft material is arranged in the hole to form a boundary layer 5;

Step ten, pouring the gelling material 2 into the upper part of the boundary layer 5 in the hole;

Step eleven, repeat the above steps seven to ten, arrange the sensor Cn on the upper part of the gelling material 2 in the measurement hole 1, and record the arrangement depth Ln of the sensor Cn; n=1, 2, 3, ...;

Step 12, setting the locking device 6 at the hole; placing the joints of the data lines 3-1, 3-2, ..., 3-n arranged in the measuring hole 1 into the locking device 6;

Step 13. When measuring the vibration velocity inside the surrounding rock, connect the joints of the data lines 3-1, 3-2, ..., 3-n placed in the locking device 6 to the data acquisition device in turn, and record the measurement data .

In the method for measuring the vibration velocity at a specific position inside the surrounding rock according to the present invention, the cementitious material 2 is cement mortar or asphalt or synthetic resin.

In the method for measuring the vibration velocity at a specific position inside the surrounding rock according to the present invention, the sensor Cn is homogeneously solidified before being lowered into the hole. The homogeneous curing process is to place the sensor Cn in a cylindrical or prismatic mold, pour the gel material 2 into the mold and let it solidify and form. The gelling material 2 should completely cover the sensor Cn.

In the method for measuring the vibration velocity at a specific position inside the surrounding rock according to the present invention, the cementitious material 2 in contact with the sensor Cn is located at the upper and lower parts of the sensor Cn, and the dimensions along the axial direction of the measuring hole 1 are larger than the outer contour of the sensor Cn. Measure the axial dimension of hole 1.

In the method for measuring the vibration velocity at a specific position inside the surrounding rock according to the present invention, the boundary layer 5 is composed of sand particles, and its thickness is 0.05 to 0.10 meters.

In the method for measuring the vibration velocity at a specific position inside the surrounding rock according to the present invention, the boundary layer 5 can also be a rubber pad, and its thickness is 0.005 to 0.01 meters.

In the method for measuring the vibration velocity at a specific position inside the surrounding rock according to the present invention, the lock device 6 is made of high-strength cast iron and consists of four parts: a lock neck 61 , a lock cover 62 , a bolt 63 and a waterproof gasket 64 .

In the method for measuring the vibration velocity at a specific position inside the surrounding rock according to the present invention, the sensor Cn is a wireless sensor, and the data acquisition device is a wireless receiving device.

The method for measuring the vibration velocity at a specific position inside the surrounding rock described in the present invention can also be used for monitoring blasting vibration parameters such as vibration frequency and vibration acceleration.

The beneficial effect of the present invention is that through the cementation of the cementitious material, the sensor is arranged at a specific measurement position inside the surrounding rock, which can not only measure the vibration velocity of a specific position inside the surrounding rock along the horizontal direction and perpendicular to the horizontal direction, but also realize Simultaneously measure the vibration velocity of multiple measuring points at different depths in one borehole. This method is simple in layout and easy to operate.

Description of drawings

Fig. 1 is a schematic diagram of the method for measuring the vibration velocity at a specific position inside the surrounding rock according to the present invention.

FIG. 2 is a front view and a top view of the locking device 6 in FIG. 1 .

Fig. 3 is a schematic diagram of the sensor Cn after homogeneous curing treatment.

In the figure: 1 is the measuring hole, 2 is the gelling material, 3-1, 3-2, 3-3, 3-n are the data lines, 4 is the hole wall, 5 is the boundary layer, 6 is the locking device, C1 , C2, C3, Cn are sensors, and 61 is a lock neck, and 62 is a lock cover, and 63 is a bolt, and 64 is a waterproof gasket.

Detailed ways

A specific embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings. Taking the monitoring of tunnel blasting vibration in the Taiyan section of Qingdao Metro Phase I Project (Line 3) as an example, measuring holes are arranged on the surface at a vertical distance of 15.8m and a horizontal distance of 25m from the blasting center of the tunnel excavation face, and three different depth measurements are taken. point vibration velocity. The data acquisition device uses a blasting vibrometer model TC-4850. The sensor selection and the standard configuration of the TC-4850 blasting vibrometer are TCS-B3 waterproof three-vector (three-dimensional) speed sensors. The sensor is a cube structure with data lines, and its size is 64mm×64mm×64mm. The specific operation as shown in Figure 1 is as follows:

The first step, at the measurement site, use a down-the-hole drilling rig of model KT15, and use a drill bit of model Q17150-65J6A to drill a diameter D of 0.15 meters and a depth L of 3.1 meter measuring hole 1;

The second step is to pour cement mortar with a water-cement-sand ratio of 1:1:3 from the hole to the bottom of the hole as the cementitious material 2, and the thickness of the cementitious material 2 is 0.09 meters;

The third step is to perform homogeneous curing treatment on sensors C1, C2, and C3 respectively: pour gelling material 2 into the bottom of a cube mold with a specification of 89mm×89mm×89mm and a wall thickness of 5mm, and the thickness of the gelling material 2 is 0.01m , place the sensor in the cube mold and make the sensor at the center of the upper part of the gelling material 2, continue pouring the gelling material 2 into the mold until the height of the gelling material 2 beyond the upper surface of the sensor is 0.01 meters, stop pouring the glue Coagulate the material 2, and at the same time lead the data line connected to the sensor from directly above the sensor; after the gel material 2 solidifies for 72 hours, the homogeneous curing process is completed;

The fourth step is to connect the sensor C1 with the nylon rope as the traction line, and use the traction line to vertically lower the homogeneously cured sensor C1 from the orifice to the gel material 2; Adjust the position of the sensor C1 with the hole meter and the gun stick until the sensor C1 is in a horizontal state; lead the data line 3-1 and the traction line connected to the sensor C1 to the outside of the hole along the measuring hole 1;

The fifth step is to continue pouring the gelling material 2 into the hole. The thickness of the gelling material 2 is 0.7 meters, and the sensor C1 is closely cemented with the hole wall 4 of the measuring hole 1 through the gelling material 2 . Record the layout depth of sensor C1 L1 = 3 meters;

The sixth step, after the cementitious material 2 is solidified for 30 minutes, arrange medium sand with a thickness of 0.05 meters on the upper part of the cementitious material 2 as the boundary layer 5;

The seventh step is pouring the cementitious material 2 with a thickness of 0.24 meters on the upper part of the boundary layer 5;

Step 8: Lower the homogeneously cured sensor C2 vertically from the orifice to the cementitious material 2 with the traction line, and adjust the position of the sensor C2 until the sensor C2 in a horizontal state. Lead the data line 3-2 and the traction line connected to the sensor C2 to the outside of the orifice along the measuring hole 1;

The ninth step is to continue pouring the gelling material 2 into the hole, the thickness of the gelling material 2 is 0.7 meters, and make the sensor C2 tightly cemented together with the hole wall 4 of the measuring hole 1 through the gelling material 2 . Record the layout depth of sensor C2 L2 = 2 meters;

Step 10: After the cementitious material 2 is solidified for 30 minutes, arrange medium sand with a thickness of 0.05 meters on the upper part of the cementitious material 2 as the boundary layer 5;

The eleventh step, pouring the gelling material 2 with a thickness of 0.24 meters on the upper part of the boundary layer 5;

The twelfth step, vertically lower the homogenously cured sensor C3 from the orifice to the cementitious material 2, and use the traction of the traction line to adjust the position of the sensor C3 with the help of a peephole instrument and a gun stick until the sensor C3 is in a horizontal state, lead the data line 3-3 and the traction line connected to the sensor C3 to the outside of the orifice along the measuring hole 1;

The thirteenth step, continue to pour the cementing material 2 into the hole, the thickness of the cementing material 2 is 0.5 meters, and make the sensor C3 tightly cemented together with the hole wall 4 of the measuring hole 1 through the cementing material 2, and record the sensor C3 The layout depth L3=1m;

The fourteenth step, setting the locking device 6: Arrange the locking neck 61 at the opening position of the measuring hole 1, and pass the data lines 3-1, 3-2, 3-3 leading out of the opening through the line hole of the locking neck 61 And place it in the lock neck 61; cut off the 3 traction wires leading out of the hole, put the part left in the hole under the lock neck 61, and use fast gel to tightly consolidate the lock neck 61 and the measuring hole 1 together , after the fast gel is completely solidified, a waterproof gasket 64 is arranged on the lock neck 61, and then the lock neck 61 and the lock cover 62 are fastened together with bolts 63;

Step 15, when measuring the vibration velocity inside the surrounding rock, open the lock cover 62, connect the data lines 3-1, 3-2, 3-3 to the data acquisition device respectively, and open the data acquisition device. The data is collected while blasting the cannon in the tunnel excavation face, and the blasting vibration velocity at 1 meter, 2 meters, and 3 meters away from the ground surface in the hole is obtained. After the vibration measurement is finished, the data lines 3-1, 3-2, 3-3 are disconnected from the data acquisition device, placed in the lock neck 61 again, and the lock device 6 is closed.

The above description is only one of the preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or replacements (such as increasing or decreasing the number of sensors arranged inside the borehole) that can be easily conceived by any person familiar with the technical field within the technical scope of the present invention shall fall within the protection scope of the present invention.

Claims (8)

1. be applicable to a measuring method for Geotechnical Engineering field country rock particular position inside vibration velocity, it is characterized in that, comprise the steps:

Step one, by country rock surface downwardly inner Drilling measured hole (1) of country rock to the L that fathoms;

Step 2, to potting compound gel material (2) at the bottom of hole;

Step 3, transfer sensor (C1) to Binder Materials (2) from aperture, use the state of tamper adjustment sensor (C1) and make the job requirement of the state coincidence senser (C1) of sensor (C1); The data line (3-1) be connected with sensor (C1) is caused outside aperture along measured hole (1);

Step 4, continue potting compound gel material (2) in hole, and make sensor (C1) closely cemented together with the hole wall (4) of measured hole (1) by Binder Materials (2), the depth of placement L1 of record sensor (C1);

Step 5, after Binder Materials (2) is tentatively solidified, arrange in hole loose materials formed boundary layer (5);

Step 6, top potting compound gel material (2) to boundary layer in hole (5);

Step 7, transfer sensor (C2) to Binder Materials (2) from aperture, use the state of tamper adjustment sensor (C2) and make the job requirement of the state coincidence senser (C2) of sensor (C2); The data line (3-2) be connected with sensor (C2) is caused outside aperture along measured hole (1);

Step 8, continue potting compound gel material (2) in hole, and make sensor (C2) closely cemented together with the hole wall (4) of measured hole (1) by Binder Materials (2), the depth of placement L2 of record sensor (C2);

Step 9, after Binder Materials (2) is tentatively solidified, arrange in hole loose materials formed boundary layer (5);

Step 10, top potting compound gel material (2) to boundary layer in hole (5);

Step 11, repetition above-mentioned steps seven to step 10, be arranged in the top of Binder Materials (2) in measured hole (1), and record the depth of placement Ln of sensor (Cn) by sensor (Cn); N=1,2,3,

Step 12, lock catch device (6) is set in aperture; To be arranged in the data line (3-1) in measured hole (1), (3-2) ..., (3-n) joint be placed in lock catch device (6);

Step 13, measure country rock internal vibration speed time, will be placed on the data line (3-1) in lock catch device (6), (3-2) ..., (3-n) joint be connected with data collector successively, and record measurement data.

2. the measuring method of country rock particular position inside vibration velocity according to claim 1, is characterized in that Binder Materials (2) is sand-cement slurry or pitch or synthetic resin.

3. the measuring method of country rock particular position inside vibration velocity according to claim 1, is characterized in that sensor (Cn) had carried out homogeneity solidification process before transferring in hole; Homogeneity solidification process is placed in cylindrical or prismatic mould by sensor (Cn), and potting compound gel material (2) in mould also makes it solidified forming; Binder Materials (2) should complete coated sensor (Cn).

4. the measuring method of country rock particular position inside vibration velocity according to claim 1, it is characterized in that the Binder Materials (2) contacted with sensor (Cn), it is positioned at sensor (Cn) top and bottom and is all greater than the size of sensor (Cn) appearance profile along measured hole (1) axis along the size that measured hole (1) is axial.

5. the measuring method of country rock particular position inside vibration velocity according to claim 1, is characterized in that boundary layer (5) is made up of sand grains, and its thickness is 0.05 meter ~ 0.10 meter.

6. the measuring method of country rock particular position inside vibration velocity according to claim 1, is characterized in that boundary layer (5) is rubber blanket, and its thickness is 0.005 meter ~ 0.01 meter.

7. the measuring method of country rock particular position inside vibration velocity according to claim 1, is characterized in that the material of lock catch device (6) is cast iron, is made up of lock neck (61), locking closure (62), bolt (63) and waterproof washer (64) four part.

8. the measuring method of the country rock particular position inside vibration velocity according to claim 1,3 or 4, it is characterized in that sensor (Cn) is wireless senser, data collector is radio receiver.