CN107870351B - A kind of installation method of double fixed retrievable microseismic sensor inside and outside the hole - Google Patents

Abstract

The invention discloses a mounting method of a dual-fixed recoverable microseismic sensor in and out of a hole. Further, the iron sleeve is sent to the bottom of the drill hole through a rubber pipe. And finally, in the hole, carrying out full hole grouting on the gap between the iron sleeve and the rock body hole wall and the gap between the rubber pipe and the rock body hole wall, so that the iron sleeve and the rock body are completely coupled and fixed. And during recovery, the microseismic sensor is taken out from the borehole through the recovery device. The invention better solves the problems that the microseismic sensor in the drill hole is difficult to fix and the installation quality and the installation power can not be ensured, and ensures the high-quality successful installation of the microseismic sensor through the double fixed coupling outside the hole. The invention can be widely used for monitoring the micro-seismic of the engineering of underground powerhouse, tunnel, side slope and roadway.

Description

A kind of installation method of double fixed retrievable microseismic sensor inside and outside the hole

technical field

The invention relates to the field of microseismic monitoring, and more particularly to an installation method of a double-fixed retrievable microseismic sensor inside and outside the hole.

Background technique

The microseismic monitoring technology uses the microseismic sensors arranged in different directions in space to capture the stress wave information emitted by the micro-fracture process of the rock mass, analyze and process it to determine the time, location and energy release of the micro-fracture event. This is the basis to infer the internal stress state and damage of the rock mass, and then carry out dynamic prediction and early warning of dynamic disasters. The microseismic monitoring technology starts from the initial stage of rock mass deformation, and tracks and monitors the progressive failure process of the rock mass from the fracture of the unit rock block to the instability of the entire rock mass, which greatly promotes the scientific nature of the monitoring work and improves the engineering and Accuracy and advance of early warning of geological hazards. Compared with the traditional observation point or cross-section monitoring, the microseismic monitoring technology can obtain the whole process of stress, strain change and displacement migration and evolution in the rock mass in three-dimensional space in real time. According to the achievements made in the world, the microseismic monitoring technology has given full play to its comprehensive monitoring of the response of rock mass to excavation, and is unique in short-term rock mass excavation safety early warning and prediction, and medium and long-term disaster classification and stability assessment. The advantages.

In order to better capture the rock mass micro-fracture information accompanying the disaster inoculation process and avoid the attenuation of the fracture signal in the rock mass surface fracture zone, the microseismic sensor is generally installed inside the rock mass through a borehole. Due to the high price of microseismic sensors, in order to save money and avoid wasting resources, the installation of microseismic sensors should use a recyclable installation method as much as possible. Therefore, in the process of practice, a series of recyclable microseismic sensor installation devices and methods have been invented (China Patent Publication No. 201020114125.4, published on 2010.02.11, the invention name is "a non-coal mine microseismic monitoring device". Chinese Patent Publication No. 2010.02.11 201320230224.2, published on 2013.05.02, title of invention "a device for installing and recovering microseismic sensors". Chinese Patent Publication No. 201320056329.0, published on 2013.01.31, title of invention "movable microseismic sensor fixed structure". Chinese Patent Publication No. 201220116630.1, published on 2012.03.26, the name of the invention is "Anchored Detachable Microseismic Sensor Installation Device". Chinese Patent Publication No. 200920353451.8, published on 2009.12.23, the invention is named "Acoustic emission deep hole monitoring sensor protection, fixation and Recovery integrated device". Chinese Patent Publication No. 201210347198.1, published on 2012.09.18, title of invention "A microseismic one-way sensor for all-round deep hole installation and recovery device for fractured rock mass". Chinese Patent Publication No. 201210346379.2, published on 2012.09. 18. Invention name "A microseismic three-way sensor for all-round deep hole installation and recovery device for fractured rock mass". Chinese Patent Publication No. 201410053996.2, published on 2014.02.18, invention name "A microseismic sensor for deep water-containing soft rock and soil mass" Hole installation and recovery device”. Chinese Patent Publication No. 104330819B, published on 2015.02.04, title of invention “A recoverable installation device and installation method for a microseismic sensor”.) The existing installation method of a retrievable microseismic sensor is generally carried out by pushing Tools such as rods directly push the microseismic sensor to the monitoring position, and fix the microseismic sensor in the hole and couple it with the rock mass. This method cannot ensure and check whether the microseismic sensor is well coupled with the rock mass, and it is difficult to ensure the installation quality and installation success rate. . This is because when the microseismic sensor is installed at a certain distance from the orifice, the fixing operation of the microseismic sensor is difficult to control, and it is impossible to ensure and verify whether the microseismic sensor is well coupled with the hole wall. When mechanical fixation is used, it is difficult to grasp the fixing strength. If the strength is too large, the microseismic sensor will be damaged. If the strength is too small, it cannot be fully coupled with the rock mass. will cause anchor failure. If the microseismic sensor is installed outside the borehole, the microseismic signal will be attenuated during the propagation of the microfracture signal from the inside to the outside of the borehole. The installation quality of the microseismic sensor directly determines the ability to capture the micro-fracture of the rock mass in the process of disaster incubation, which in turn affects the effect of disaster warning.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the defects of the above-mentioned retrievable microseismic sensor installation method, and to provide a high-quality and successful installation of the microseismic sensor in the hole and outside the hole double-fixed retrievable microseismic sensor installation method.

In order to achieve the above purpose, the double-fixed retrievable microseismic sensor installation method in the hole and outside the hole designed by the present invention is special in that it includes the following steps:

Outside the hole, install the microseismic sensor with the retrievable device in the bottom sealed sleeve, and carry out the installation quality inspection;

Provide multi-section connecting pipes that can be butted with each other, have the same inner diameter as the sleeve and can be butted with the sleeve;

Push the sleeve installed with the microseismic sensor into the hole, add the connecting pipe section by section during the process of pushing the sleeve to the bottom of the hole, and ensure that the signal line of the microseismic sensor is in the sleeve and the connecting pipe;

After the sleeve is pushed to the bottom of the borehole, grouting is performed on the borehole to complete the fixation of the microseismic sensor.

Further, the bottom of the sleeve is provided with a support rod.

Further, the support rod is an iron rod.

Further, the length of the support rod is 18-22 cm.

Further, in the process of pushing the sleeve into the bottom of the hole, the butt joints between the connecting pipes are all butted when the previous section of the connecting pipes is pushed into the borehole to 30 cm before being sent into the borehole.

Further, the sleeve is an iron sleeve or a steel sleeve, and the connecting pipe is a glue connecting pipe.

Further, the inner and outer diameters of the sleeve and the connecting sleeve are the same, the outer wall of the connection between the sleeve and the connecting sleeve is provided with a connecting sleeve, the connecting sleeve is fixed on the sleeve and the connecting sleeve by bolts, and the connecting pipes are mutually The connection is also achieved through external connection sleeves and bolts.

Further, the length of the connecting pipe is 1-2 m, and the length of the connecting sleeve is 15-25 cm.

Further, both the sleeve and the connection sleeve are provided with bolt connection holes for connecting bolts, and the bolt connection holes are arranged at a distance of 5 cm from the end face of the connection pipe or the sleeve.

Further, the length of the sleeve is 9-15 cm longer than that of the recyclable device.

Compared with the prior art, the present invention has the following advantages:

1. Outside the hole, the microseismic sensor should be fixed and coupled before the microseismic sensor is put into the drill hole. The fixing operation outside the hole is convenient and the coupling quality can be checked and tested to ensure the installation quality of the microseismic sensor.

2. In the hole, fill the gap between the iron sleeve and the rubber hose and the rock mass hole wall with grouting, so that the iron sleeve and the rock mass are completely coupled and fixed, and there is no need to fix the installation rod, and the operation is convenient.

3. The installation quality and installation success rate of the microseismic sensor are ensured by the double fixed coupling inside the hole and outside the hole.

Description of drawings

Fig. 1 is the overall longitudinal sectional view of the present invention

Figure 2 is a sectional view of the connection between the iron sleeve and the hose

Among them, 1-drilling hole, 2-sleeve, 3-microseismic sensor, 4-nut, 5-connecting sleeve, 6-connecting pipe, 7-microseismic sensor signal transmission line, 8-support rod, 9-microseismic sensor recovery device, 10-rock mass, 11-grouting pipe

Detailed ways

The present invention is described in further detail below in conjunction with the accompanying drawings and specific embodiments:

As shown in the figure, when outside the hole, the microseismic sensor 3 and the recoverable device 9 are installed in the iron sleeve 2 and fixed, and the installation quality is checked to ensure that the fixed installation is correct. Different fixing methods can be selected according to the selected recoverable device 9, and the commonly used wedge-shaped sliding iron block recovery device is generally used for fixing. In order to satisfy and facilitate installation and fixation, the length of the iron sleeve 2 is 10cm greater than that of the microseismic sensor and the recoverable device. The diameter of the iron sleeve 2 is determined according to the diameter of the microseismic sensor 3 and the type and size of the selected recoverable device 9 to ensure the The sensor 3 can be easily fixed and disassembled in the sleeve 2 . An iron rod with a length of 20 cm is welded outside the bottom end of the iron sleeve 2 to prevent the iron sleeve 2 from contacting the gravel at the bottom of the hole when the iron sleeve 2 is pushed to the bottom of the borehole 1, which will affect the collection of micro-fracture signals. Four threaded holes are arranged on the cross section at a distance of 5 cm from the top of the iron sleeve 2, and the threaded holes are evenly distributed along the radial direction for docking with the connecting pipe 6. The connecting pipe 6 is generally a rubber hose. A connecting sleeve 5 is provided on the outer wall of the connection between the sleeve 2 and the connecting sleeve 6, and the connecting sleeve 5 is generally a rubber sleeve. Pass the microseismic sensor signal transmission line 7 through the connecting pipe 6 and the connecting sleeve 5 outside the hole, connect the connecting pipe 6 with the iron sleeve 2 , and connect the iron sleeve 2 and the connecting pipe 6 through the connecting sleeve 5 and the nut 4 . The inner and outer diameters of the connecting pipe 6 are consistent with the iron sleeve 2 to ensure seamless connection between the two. The inner diameter of the connecting sleeve 5 is the same as the outer diameter of the connecting pipe 6 to ensure seamless fixing between the connecting sleeve 5 , the connecting pipe 6 and the iron sleeve 2 . The length of the rubber sleeve 6 is 20cm, and four threaded holes are arranged on the cross section at a distance of 5cm from both ends of the connecting pipe 6. The threaded holes are evenly distributed in the radial direction to ensure that the connecting sleeve 5 is connected to the connecting pipe 6 and the iron sleeve. 2 can be connected by thread 4. Four threaded holes are respectively arranged on the cross section at a distance of 5 cm from both ends of the connecting sleeve 5 . When the connected iron sleeve 2 and the connecting pipe 6 are sent into the borehole 1 until 30 cm is not sent into the borehole 1, the signal transmission line 7 of the microseismic sensor is passed through the second connecting pipe 6 outside the borehole 1. When the second connecting pipe 6 is docked with the first connecting pipe 6 in the drilled hole 1, and connected by the rubber sleeve 5 and the nut 4, after the connection is pushed into the drilled hole 1 to 30 cm before it is sent into the drilled hole 1, Connect the third connecting pipe 6 . By analogy, the connected connecting pipe 6 is continuously pushed into the borehole 1, the bottom of the sleeve 2 is provided with an iron support rod 8, and the connecting pipe 6 is pushed into the borehole 1 until the support rod 8 touches the bottom of the hole. Push the grouting pipe 11 from the orifice to the bottom of the hole, and inject cement mortar into the drilled hole 1, so that the hole is filled with cement mortar. After the microseismic monitoring is completed, the microseismic sensor 3 is taken out and recovered by the recoverable device 9 . The above examples are only used to illustrate the technical solutions of the present invention and not to limit them. Those of ordinary skill in the art should understand that the technical solutions of the present invention are modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention. within the scope of the claims of the present invention.

Claims (10)

1. a double-fixed retrievable microseismic sensor installation method in a hole and outside the hole, is characterized in that, comprises the following steps: Outside the hole, install the microseismic sensor (3) covered with the recoverable device (9) in the bottom sealed sleeve (2), and carry out the installation quality inspection; Provide a multi-section connecting pipe (6) that can be butted with each other, has the same inner diameter as the sleeve and can be butted with the sleeve (2); Push the sleeve (2) on which the microseismic sensor (3) is installed into the hole, add the connecting pipe (6) section by section during the process of pushing the sleeve to the bottom of the hole, and ensure that the signal line of the microseismic sensor is connected between the sleeve and the hole. inside the tube; After the sleeve (2) is pushed to the bottom of the borehole, the borehole is grouted to complete the fixing of the microseismic sensor. 2 . The method for installing a retrievable microseismic sensor with double fixation inside and outside the hole according to claim 1 , wherein a support rod ( 8 ) is provided at the bottom of the sleeve ( 2 ). 3 . 3 . The installation method of the retrievable microseismic sensor with double fixation inside and outside the hole according to claim 2 , wherein the support rod ( 8 ) is an iron rod. 4 . 4 . The method for installing a retrievable microseismic sensor with double fixation inside the hole and outside the hole according to claim 2 , wherein the length of the support rod ( 8 ) is 18-22 cm. 5 . 5. The installation method of double-fixed retrievable microseismic sensor in the hole and outside the hole according to claim 1, characterized in that: in the process of pushing the sleeve (2) into the bottom of the hole, the connecting pipes (6) are connected to each other. The butt joints are carried out when the previous section of the connecting pipe (6) is pushed into the borehole to 30 cm before it is sent into the borehole. 6. The method for installing a retrievable microseismic sensor with double fixation inside the hole and outside the hole according to claim 1, characterized in that: the sleeve (2) is an iron sleeve or a steel sleeve, and the connecting pipe (6) ) is the glue connection tube. 7. The double-fixed retrievable microseismic sensor installation method in the hole and outside the hole according to claim 1, characterized in that: the inner and outer diameters of the sleeve (2) and the connecting sleeve (6) are the same, and the inner and outer diameters of the sleeve (2) are the same. ) and the connecting sleeve (6) are provided with a connecting sleeve (5) on the outer wall, the connecting sleeve (5) is fixed on the sleeve (2) and the connecting sleeve (6) by bolts, and the connecting pipe (6) ) are also connected to each other through external connection sleeves and bolts. 8 . The installation method of the retrievable microseismic sensor with double fixation inside and outside the hole according to claim 7 , wherein the length of the connecting pipe ( 6 ) is 1-2 m, and the length of the connecting sleeve ( 5 ) is 1-2 m. 9 . 15～25cm. 9. The method for installing a retrievable microseismic sensor with double fixation inside the hole and outside the hole according to claim 1, wherein the sleeve (2) and the connecting sleeve (6) are both provided with a connecting bolt for connecting bolts. Bolt connection holes and bolt connection holes are arranged at a distance of 5cm from the end face of the connecting pipe or casing. 10 . The method for installing a retrievable microseismic sensor with double fixing inside and outside the hole according to claim 1 , wherein the sleeve ( 2 ) is 9-15 cm longer than the recoverable device ( 9 ). 11 .

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