CN114370248B - Weak broken rock mass tunnel pore wall stabilising arrangement and surrounding rock looseness circle detection device - Google Patents
Weak broken rock mass tunnel pore wall stabilising arrangement and surrounding rock looseness circle detection device Download PDFInfo
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- CN114370248B CN114370248B CN202210038444.9A CN202210038444A CN114370248B CN 114370248 B CN114370248 B CN 114370248B CN 202210038444 A CN202210038444 A CN 202210038444A CN 114370248 B CN114370248 B CN 114370248B
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- 239000011435 rock Substances 0.000 title claims abstract description 107
- 238000001514 detection method Methods 0.000 title claims description 29
- 239000011148 porous material Substances 0.000 title claims description 15
- 230000003019 stabilising effect Effects 0.000 title claims description 7
- 238000012360 testing method Methods 0.000 claims abstract description 176
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 21
- 230000014759 maintenance of location Effects 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 196
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/122—Multiple string packers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/124—Units with longitudinally-spaced plugs for isolating the intermediate space
- E21B33/1243—Units with longitudinally-spaced plugs for isolating the intermediate space with inflatable sleeves
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention relates to the technical field of tunnel rock mass detection, and particularly discloses a weak broken rock mass tunnel hole wall stabilizing device and a surrounding rock loosening ring detecting device. The device includes: at least two retention balloons; the first air pipe is communicated with each holding air bag and is used for inflating each holding air bag; at least one telescopic air bag, wherein the telescopic air bag is arranged between two adjacent holding air bags; the second air pipe is communicated with all the telescopic air bags and used for inflating and exhausting the telescopic air bags, the telescopic air bags are used for stretching to fill the testing space between the two adjacent keeping air bags when inflated, and shrink to expose the testing space between the two adjacent keeping air bags when exhausted. The invention keeps the wall of the testing hole stable by keeping the air bag and the telescopic air bag, adopts a sectional type sound wave testing method, and ensures that the wall of each fixed depth hole is not supported by the air bag only in the testing time period of the section, thereby realizing the repeated use of a single hole in the test of the surrounding rock loosening ring of the weak broken rock mass tunnel.
Description
Technical Field
The invention relates to the technical field of tunnel rock mass detection, in particular to a weak broken rock mass tunnel hole wall stabilizing device and a surrounding rock loosening ring detecting device.
Background
The development of the surrounding rock loosening ring of the weak broken rock mass tunnel is influenced by the construction process, and the method has an obvious space-time effect. The tunnel surrounding rock loosening ring range is an important parameter for determining tunnel supporting parameters, and the development rule of the tunnel surrounding rock loosening ring range is an important basis for clarifying the progressive damage mechanism of the surrounding rock.
At present, a single-hole sound wave method is mostly adopted in China to test the loosening ring of the surrounding rock, water is used as a coupling agent in the test process, sound waves are refracted between the water and the rock wall to form gliding waves along the interface of the water and the rock wall, and the wave speed of the rock body is determined according to the gliding time and distance of the sound waves. However, in weak and broken rock, due to poor stability of the hole wall and a plurality of cracks, the hole collapse problem can be caused for a certain time after the drilling is finished, so that the drilling cannot be reused, and the water retention is poor. Especially, the loose circle range of the surrounding rock of the weak broken rock body tunnel is wide, the drilling depth is large, if the repeated drilling at the same position is adopted for testing, not only is serious cost and time pressure caused, but also the testing precision of the loose circle of the surrounding rock is influenced.
Aiming at the problem that a drilled hole cannot be reused, at present, a hole protecting pipe is placed in the drilled hole and a window is opened on the hole protecting pipe for conducting sound wave test on surrounding rocks, but the sound wave speed of the hole protecting pipe material meeting the requirements of rigidity and strength is higher than that of a broken rock body at present, according to the sound wave method test principle, the hole protecting pipe will seriously affect the sound wave test result of the surrounding rocks and further affect the loose circle test result of the surrounding rocks.
In addition, broken rock mass drilling can not effectively retain water, and then influences the sound wave propagation, and the method that makes sound wave transmitter and sound wave receiver hug closely the pore wall rock mass through elastic component etc. among the relevant art solves, but because weak broken rock mass hardly forms the smooth pore wall of rule when driling, and sound wave transmitter and receiver are mostly rigid member in addition, are difficult to realize the effective coupling with the pore wall rock mass to influence the acoustic test effect.
Disclosure of Invention
In view of this, the invention provides a weak broken rock tunnel hole wall stabilizing device and a surrounding rock loosening ring detecting device, and aims to solve the problem that a drill hole cannot be reused.
In one aspect, the invention provides a weak fractured rock tunnel hole wall stabilizing device, which comprises: at least two retention balloons; a first air tube communicating with each of the holding airbags for inflating each of the holding airbags; at least one telescopic air bag is arranged between two adjacent retaining air bags; the second air pipe is communicated with each telescopic air bag and is used for inflating and exhausting each telescopic air bag; the telescopic air bags are used for stretching to fill the testing space between two adjacent holding air bags when being inflated and contracting to expose the testing space between two adjacent holding air bags when being deflated; the holding air bag and the telescopic air bag are both provided with a channel for the test probe to pass through.
Further, in the weak fractured rock tunnel hole wall stabilizing device, the difference between the distance between two adjacent retaining airbags and the length of the test probe is within a preset range.
Further, in the weak fractured rock tunnel hole wall stabilizing device, one end of each holding air bag, which is opposite to the telescopic air bag, of a channel through which the test probe passes is provided with a gradually-changed cross section, and the cross section is gradually increased along a direction close to the telescopic air bags.
Further, above-mentioned weak broken rock mass tunnel pore wall stabilising arrangement still includes: and the two pressure detection devices are respectively connected with the first air pipe and the second air pipe and are used for measuring the gas pressure in the holding air bag and the telescopic air bag.
According to the invention, the holding air bags and the telescopic air bags are placed in the test holes, and during test, the telescopic air bags shrink along the second air pipe, so that a cavity is formed between the two holding air bags, and rock mass on the hole wall between the two holding air bags is exposed for detection. After the test, the telescopic air bag is inflated to stretch along the second air pipe so as to support the hole wall rock body corresponding to the test space. According to the invention, the air bags and the telescopic air bags are kept to keep the wall of the testing hole stable, the sectional type sound wave testing method is adopted, and the wall of each fixed depth hole is not supported by the air bags only in the testing time period, so that the repeated detection of the surrounding rock loosening ring of the weak broken rock mass tunnel by using a single hole is realized. In addition, because the telescopic air bag is contracted during testing, sound waves emitted by the testing probe are transmitted to the hole wall rock body to be tested by taking water as a coupling agent, so that the sound wave velocity of the rock body is accurately tested, and the problem of low testing accuracy in the prior art through the supporting protective pipe is solved.
On the other hand, the invention also provides a device for detecting the loose circle of the surrounding rock of the weak broken rock mass tunnel, which comprises the following components: any one of the above hole wall stabilizing devices, wherein the hole wall stabilizing device is used for being placed in a test hole to support the test hole; and the test probe is arranged in the channels of the holding air bags and the telescopic air bags in the hole wall stabilizing device and is arranged between two adjacent holding air bags.
Further, among the above-mentioned weak broken rock mass tunnel country rock looseness circle detection device, test probe includes: a body; an acoustic transmitter and an acoustic receiver coupled to the body; the first closed water bag and the second closed water bag are respectively connected to two ends of the body and are used for being abutted to the keeping air bag; and the at least two one-way pressure valves are respectively connected with the two first closed water bags and the second closed water bags and arranged facing the test space, and are used for discharging water to the test space when the pressure in the first closed water bags or the second closed water bags is greater than a first preset value.
Further, in the device for detecting the loose circle of the surrounding rock of the weak fractured rock mass tunnel, the end parts of the holding air bags, which are used for being abutted against the first closed water bag and the second closed water bag, are both provided with a conical shape, and the bottom ends of the conical shapes face the test space; the first closed water bag and the second closed water bag are in a conical shape, so that the first closed water bag and the second closed water bag are matched with the conical shape of the end part of the holding air bag.
Further, still include in the above-mentioned weak broken rock mass tunnel country rock pine circle pore wall stabilising arrangement: and the water pressure detection device is connected to the body and used for measuring the water pressure in the test space between the two holding air bags.
Further, still include in the above-mentioned weak broken rock mass tunnel country rock pine circle pore wall stabilising arrangement: a control device; the control device is electrically connected with the water pressure detection device and is used for acquiring a pressure value detected by the pressure detection device; the control device is also used for being electrically connected with the water filling devices of the first closed water bag and the second closed water bag and controlling the water filling devices to stop filling water into the first closed water bag and the second closed water bag when the pressure value is larger than a second preset value.
Further, among the above-mentioned weak broken rock mass tunnel country rock loosening circle pore wall stabilising arrangement, still include: the first water pipe is communicated with the first closed water bag; a second water pipe communicated with the second closed water bag
The invention keeps the wall of the testing hole stable through the distributed keeping air bag and the telescopic air bag, adopts the sectional type sound wave testing method, and the wall of each fixed depth hole is not supported by the air bag only in the testing time period of the section, thereby realizing the repeated use of a single hole in the weak broken rock mass tunnel surrounding rock loosening ring test.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application, as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.
FIG. 1 is a schematic structural diagram of a hole wall stabilizing device for a loose circle of surrounding rock of a weak fractured rock mass tunnel provided by the embodiment of the invention;
FIG. 2 is a schematic structural diagram of a test probe in the device for detecting the loosening coil of the surrounding rock of the weak fractured rock mass tunnel provided by the embodiment of the invention;
fig. 3 is a schematic structural diagram of a water filling pipe in the weak broken rock mass tunnel surrounding rock loosening ring detection device provided in the embodiment of the invention.
Detailed Description
Preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present application have been illustrated in the accompanying drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the present application.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, being fixedly connected, releasably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1, an embodiment of the present invention provides a soft fractured rock mass tunnel hole wall stabilizing apparatus 100, which includes: a holding balloon 110, a first air tube 120, a telescopic balloon 130 and a second air tube 140.
At least two holding airbags 110 are provided, and the first air tube 120 is communicated with each holding airbag 110 and used for inflating each holding airbag 110. The holding airbags 110 are connected in series by a first air pipe 120, the first air pipe 120 is provided with air outlets (not shown) having the same number as the holding airbags 110, and the air outlets are communicated with the holding airbags 110 in a one-to-one correspondence manner. The holding airbag 110 may be made of an elastic material such as rubber, or may be made of a non-elastic material, and when the holding airbag 110 is inflated with gas, it expands outwards to fill the test hole, so as to support the test hole.
At least one telescopic airbag 130 is arranged, one telescopic airbag 130 is arranged between two adjacent retaining airbags 110, and the number of the telescopic airbags 130 is determined according to the number of the retaining airbags 110. Telescoping bladder 130 and retaining bladder 110 remain separate, i.e., not connected to each other. The telescopic airbags 130 are formed by connecting the second air pipes 140 in series, the second air pipes 140 are provided with air transmission holes (not shown) with the same number as the telescopic airbags 130, each air transmission hole is communicated with each telescopic airbag 130 in a one-to-one correspondence manner, and the second air pipes 140 are used for inflating and exhausting each telescopic airbag 130. The bellows balloon 130 is adapted to stretch along the second gas tube 140 to fill the test space between two adjacent retention balloons 110 when inflated and to contract along the second gas tube 140 to reveal the test space between two adjacent retention balloons 110 when deflated.
When the telescopic airbag 130 is inflated, the telescopic airbag 130 can be stretched between the holding airbags 110 on the two sides, the two ends of the stretched telescopic airbag 130 are respectively abutted to the holding airbags 110 on the two sides, at this time, the telescopic airbag 130 is inflated in the test space between the two holding airbags 110, and the hole wall rock mass corresponding to the test space is supported. When the bellows 130 is deflated, the bellows 130 is compressed in the direction of any adjacent retaining bellows 110 until it is attached to the retaining bellows 110, at which time the test space between the two retaining bellows 110 is exposed.
In some embodiments, bellows 130 may be an elongated bladder made of a resilient or non-resilient material.
In other embodiments, bellows 130 may be a pleated bladder, i.e., provided with a plurality of annular raised portions and annular recessed portions disposed between adjacent annular raised portions, which are stretched when bellows 130 is inflated to thereby stretch bellows 130 between two holding bladders 110; when the air is pumped out from the telescopic airbag 130, the annular concave portion is compressed to make the annular convex portions tightly attached together.
In the embodiment of the present invention, the first air tube 120 and the second air tube 140 may be flexible tubes or rigid tubes, the holding air bags 110, the telescopic air bags 130, the first air tube 120 and the second air tube 140 are in a strip shape after being inflated, the first air tube 200 and the second air tube 400 are in a linear shape, the holding air bags 110 are linearly arranged along the first air tube 120, and the telescopic air bags 130 are linearly arranged along the second air tube 140.
It is understood that the first air tube 120 and the second air tube 140 in the present embodiment should be connected to the air pump 150, the air pump 150 can perform the functions of fully inflating and evacuating, and the air pump 150 can inflate the first air tube 120 and inflate and evacuate the second air tube 140.
The holding balloon 110 and the telescopic balloon 130 are each formed with a passage for the test probe 200 to pass through.
In some embodiments, retention balloon 110 and telescoping balloon 130 are hollow structures for test probe 200 to pass through.
In some embodiments, holding balloon 110 and retracting balloon 130 may each be annular bodies, and when holding balloon 110 and retracting balloon 130 are inflated, the hollow portions of the annular bodies of holding balloon 110 and retracting balloon 130 form a channel in communication for test probe 200 to pass through.
During testing, firstly, drilling a test hole on the surrounding rock of the weak broken rock mass tunnel to be detected, and cleaning the test hole; then, the holding airbag 110, the telescopic airbag 130, part or all of the first air tube 120 and part or all of the second air tube 140 are placed in the test hole, the first air tube 120 and the second air tube 140 are inflated by the air pump 150, and the holding airbag 110 and the telescopic airbag 130 are further inflated to support the test hole. Then, the telescopic air bag 130 is deflated, so that the telescopic air bag 130 is contracted to be tightly attached to the holding air bags 110, the hole wall rock mass between the two holding air bags 110 is exposed in the testing space, and then the testing probe 200 is extended into the channels of the holding air bags 110 and the telescopic air bags 130 and placed in the testing space between the two holding air bags 110, so that the hole wall rock mass corresponding to the testing space between the two holding air bags 110 is tested.
After the test, the test probe 200 is moved to a position between the next two adjacent holding airbags 110 to test the next test point, the method is repeated until all the test points are tested, the test probe 200 is moved out of the channels of the holding airbags 110 and the telescopic airbags 130 to inflate the telescopic airbags 130, so that each telescopic airbag 130 is filled in the test space between the adjacent holding airbags 110, and the hole wall rock mass between the adjacent two holding airbags 110 is supported.
It should be noted that, in the implementation, the number and the length of the holding airbags 110 need to be determined according to the distribution of the test points in the test holes, and the number and the length of the holding airbags 110 are not limited in this embodiment. The lengthwise direction of the holding balloon 110 in the embodiment of the present application means the depth direction along the test hole.
It can be seen that, in the embodiment, the wall of the testing hole is kept stable through the distributed maintaining air bag 110 and the telescopic air bag 130, and the sectional type sound wave testing method is adopted, so that the wall of each fixed depth hole is not supported by the air bag only in the testing time period, and the repeated detection of the loose circle of the surrounding rock of the weak broken rock mass tunnel by using a single hole is realized. In addition, because the telescopic air bag 130 of the embodiment of the application is contracted during testing, the sound wave emitted by the testing probe is transmitted to the hole wall rock body to be tested by taking water as a coupling agent, so that the wave velocity of the sound wave of the rock body is accurately tested, and the problem of low accuracy in testing through the supporting protective pipe in the prior art is solved.
In some embodiments, the distance between two adjacent retention balloons 110 is within a predetermined range of the difference in length of the test probe 200. Note that the length of the test probe 200 refers to the length in the up-down direction shown in fig. 2.
Specifically, the distance between two adjacent retention balloons 110 may be equal to the length of the test probe 200, and may be slightly greater or smaller than the length of the test probe 200, with the spacing between the two retention balloons 110 being substantially equal to the length of the test probe 200, so that the test probe 200 may be placed in the test space between two adjacent retention balloons 110.
It should be noted that, in specific implementation, the preset range may be determined according to actual situations, and this embodiment does not limit the preset range at all.
In some embodiments, the ends 111 of the holding balloon 110 opposite the bellows balloon 130 through which the test probe 200 passes are each provided with a tapered cross-sectional shape, and the cross-section gradually increases in a direction approaching the bellows balloon 130 to facilitate passage of the test probe 200. Specifically, the end of holding airbag 110 opposite telescoping airbag 130 may be tapered, flared, etc.
In some embodiments, further comprising: two pressure detecting means 160 are connected to the first air tube 120 and the second air tube 140, respectively, for measuring the gas pressure inside the holding air bag 110 and the telescopic air bag 130. Specifically, the pressure detection device 160 is a barometer.
Before testing, the pressure required for testing the stability of the hole wall is determined according to the test burial depth, the surrounding rock crushing condition and the ground stress condition, and the calculation method is well known by the person skilled in the art and is not repeated.
During testing, the holding air bag 110 and the telescopic air bag 130 are respectively inflated through the first air pipe 120 and the second air pipe 140, and after the pressure values in the holding air bag 110 and the telescopic air bag 130 reach the required air pressure through the monitoring of the barometer, the inflation is finished. The air pressure in the holding air bag 110 and the telescopic air bag 130 is monitored periodically, and when the air pressure is less than 90% of the required air pressure, supplementary inflation is carried out in time to ensure the support of the test hole wall.
Referring to fig. 1 to 3, the embodiment of the application further provides a weak broken rock mass tunnel surrounding rock looseness circle detection device, and the device includes: any of the bore wall stabilization devices 100 and test probes 200 described above. The test well stabilization device 100 is placed within a test well to support the test well. The specific implementation process of the hole wall stabilizing device 100 may refer to the above description, and this embodiment is not described herein again.
The test probe 200 is arranged in the passages of the holding airbags 110 and the telescopic airbags 130 in the hole wall stabilizing device and is arranged between two adjacent holding airbags 110 so as to detect the exposed hole wall rock mass when the telescopic airbags 130 contract. In one embodiment, the test probe 200 performs acoustic testing with water as the coupling agent.
This embodiment is placed in the test hole and is kept gasbag 110 and flexible gasbag 130, during the test, flexible gasbag 130 contracts along second trachea 140, two are kept forming the cavity between gasbag 110, make the pore wall rock mass expose so that measure, after the test, flexible gasbag 130 is aerifyd and is stretched to support the pore wall rock mass that the test space corresponds, because this application embodiment supports the pore wall through keeping gasbag 110 and flexible gasbag 130 when not testing, so the pore wall can not collapse, can reuse. In addition, because the telescopic air bag 130 of the embodiment of the application contracts during testing, the sound wave emitted by the testing probe is transmitted to the hole wall rock body to be tested by taking water as a coupling agent, so that the sound wave velocity of the rock body is accurately tested, and the problem of low accuracy in detection through the supporting protective pipe in the prior art is solved.
In some embodiments, the test probe 200 includes: the sound wave receiver comprises a body 210, a sound wave transmitter 220, two sound wave receivers 230, a first closed water bag 240, a second closed water bag 250 and a one-way pressure valve 260. The body 210 is in the shape of a strip, a hollow cylinder, etc., the sound wave emitter 220 and the two sound wave receivers 230 are both connected to the body 210, the first closed water bag 240 is located at the front end (the upper end shown in fig. 2) of the body 210, and the second closed water bag 250 is located at the rear end (the lower end shown in fig. 2) of the body 210.
The first and second closed water bags 240 and 250 are connected to both ends of the body 210, respectively, and the first and second closed water bags 240 and 250 are used to abut against the holding air bags 110 after being filled with water, so as to close the test space between the two holding air bags 110. Each of the one-way pressure valves 260 is connected to the first and second closed water pockets 240 and 250, respectively, and is disposed to face the test space. When the pressure in the first closed water bladder 240 is greater than the first preset value, the one-way pressure valve 260 connected to the first closed water bladder 240 discharges water to the test space, and when the pressure in the second closed water bladder 250 is greater than the first preset value, the one-way pressure valve 260 connected to the second closed water bladder 250 discharges water to the test space.
Specifically, two one-way pressure water valves 260 are distributed on the first closed water bag 240 and the second closed water bag 250 facing the test space, when the water pressure in the first closed water bag 240 and the second closed water bag 250 reaches a preset pressure value, the water in the first closed water bag 240 and the second closed water bag 250 overflows to the test space through the respective one-way pressure water valves 260, and the first closed water bag 240 and the second closed water bag 250 are abutted to the holding air bag 110 to seal the water in the test space, thereby realizing water retention. It should be noted that, in specific implementation, the preset pressure value may be determined according to an actual situation, and this embodiment does not limit the preset pressure value at all.
According to the embodiment of the application, the first closed water bag 240 and the second closed water bag 250 are distributed at the front end and the rear end of the test probe 200, so that the first closed water bag 240 and the second closed water bag 250 can be attached to the maintaining air bag 110 closely, and sectional water retention is realized.
In some embodiments, the ends of each holding balloon 110 for abutment with the first and second closed water balloons 240, 250 are provided with a conical shape, with the bottom end of the cone facing the test space. Accordingly, the first and second closed water bags 240 and 250 have a tapered shape, and the shapes of the first and second closed water bags 240 and 250 are adapted to the tapered shape of the end of the holding air bag 110, so as to better seal the water in the test space and effectively retain the water.
In some embodiments, the holding balloon 1 has a flared channel at both ends for passing the test probe 200, which can facilitate passing the test probe 200, and can be in close contact with the first and second closed water bags 240 and 250 to form a water-retaining space.
In some embodiments, further comprising: and a water pressure detecting device connected to the body 210 for measuring the water pressure in the test space. Specifically, the water pressure detection device is a water pressure sensor 270, the water pressure sensor 270 is disposed in the middle of the test probe 200, and when the water pressure in the test space reaches 50KPa, the test space is considered to achieve the water retention effect.
In some embodiments, further comprising: a control device (not shown in the figure). The control device is electrically connected with the water pressure detection device and used for obtaining the pressure value of the test space detected by the water pressure detection device. The control device is further configured to be electrically connected to the water filling devices of the first closed water bag 240 and the second closed water bag 250, and is configured to control the water filling devices to stop filling water into the first closed water bag 240 and the second closed water bag 250 when the pressure value detected by the water pressure detection device is greater than a second preset value, and at this time, the water pressure in the test space has reached the test requirement. In specific implementation, the control device may be a test terminal.
In one embodiment, the water paths of the first closed water bag 240 and the second closed water bag 250 are controlled independently, and water can be filled and discharged independently. The first closed water pocket 240 communicates with a first water pipe, and the second closed water pocket 250 communicates with a second water pipe. The control device is electrically connected with the control valves on the first water pipe 322 and the second water pipe 323, and the water charging and discharging of the first closed water bag 240 and the second closed water bag 250 are respectively controlled by controlling the opening and closing of the valves on the first water pipe 322 and the second water pipe 323. Of course, the first water pipe 322 and the second water pipe 323 may be connected to different water pumps, and the water charging and discharging of the first closed water bag 240 and the second closed water bag 250 may be controlled by controlling the start and stop of the water pumps.
It should be noted that, in specific implementation, the second preset value may be determined according to an actual situation, and this embodiment does not limit the second preset value.
The test probe 200 is pushed into the test hole through the probe head section pushing pipe 300, and the test probe 200 is connected with the probe head section pushing pipe 300 through a screw. A data transmission line 310 and a water filling pipe 320 are arranged in the probe head section propelling pipe 300, the data transmission line 310 is connected with the water pressure sensor 270, the sound wave transmitter 220 and the two sound wave receivers 230, and the water filling pipe 320 is communicated with the first closed water bag 240 and the second closed water bag 250. The data transmission line 310 transmits test data of the wave velocity of the surrounding rock and the pressure value of the test space detected by the water pressure sensor 270 in the test process, and transmits the test data of the wave velocity of the surrounding rock and the water pressure value of the test space to the test terminal.
The water filling pipe 320 is composed of a protection pipe 321, a first water pipe 322 and a second water pipe 323. Wherein, the first water pipe 322 and the second water pipe 323 are independent, the first water pipe 322 is communicated with the first closed water bag 240, and the second water pipe 323 is communicated with the second closed water bag 250. The first water pipe 322 and the second water pipe 323 can be distinguished by color or surface number of the water pipes to realize independent control of water charging and discharging of the first closed water bag 240 and the second closed water bag 250. The protection pipe 321 is sleeved outside the first water pipe 322 and the second water pipe 323.
When the embodiment of the application is used for detection, the test hole stabilizing system is used for supporting the test hole and testing the hole wall rock mass through the test probe.
The test hole is supported by the test hole stabilizing system, and the method comprises the following steps:
1) Drilling and cleaning a rock mass to be detected;
2) Assembling the hole wall stabilizing system and then placing the assembled hole wall stabilizing system in a test hole;
3) Determining the pressure required by the stability of the hole wall according to the test burial depth, the surrounding rock crushing condition and the ground stress condition;
4) The maintaining air bag 110 and the telescopic air bag 130 are respectively inflated through the first air pipe 120 and the second air pipe 140, the pressure of the maintaining air bag 110 and the pressure of the telescopic air bag 130 are tested through a barometer, and the inflation is finished after the required air pressure is reached;
5) The air pressure of the maintaining air bag 110 and the telescopic air bag 130 is monitored regularly, and when the air pressure is less than 90% of the required air pressure, supplementary inflation is performed in time.
A single test procedure by test probe 200 is as follows:
1) Connecting the test probe 200 with the probe head section propulsion pipe 300, and connecting the water filling pipe 320 with a water pump and a water pressure gauge (not shown in the figure);
2) The second air tube 140 is used for evacuating the telescopic air bag 130, so that the telescopic air bag 130 is tightly attached to the holding air bag 110;
3) Pushing the test probe 200 into the channel of the first holding balloon 110 through the probe head section pushing tube 300;
4) Observing through the size mark of the probe propelling tube that after the test probe 200 passes through the holding airbag 110, the first closed water bag 240 is filled with water through the first water tube 322, so that the first closed water bag 240 is fully expanded;
5) Continuing to push the test probe 200 inward until the first closed water bladder 240 cannot be pushed further due to contact with the flare of the holding air bladder 110;
6) The first closed water bag 240 and the second closed water bag 250 are respectively filled with water through the first water pipe 322 and the second water pipe 323, data of the water pressure sensor 270 are observed, when the water pressure reaches 50KPa, the water filling is stopped, the data of the water pressure sensor 270 are monitored in real time, and when the water pressure is lower than 50KPa, the water is continuously filled into the first closed water bag 240 and the second closed water bag 250, so that the water pressure in the test space is kept at 50KPa, and the water retention effect is achieved.
7) Testing acoustic waves of surrounding rocks;
8) After the single-point surrounding rock sound wave test is finished, pumping water to the first closed water bag 240 and the second closed water bag 250 through the first water pipe 322 and the second water pipe 323, and enabling the first closed water bag 240 and the second closed water bag 250 to be completely contracted; the probe advancing tube is lengthened and the test probe 200 is advanced further into the test hole to reach the next test point.
9) Repeating the step 4) to the step 8) until all the test points are tested;
10 The test probe 200 is withdrawn from the borehole by completely withdrawing the water in the first and second closed water pockets 240 and 250 through the first and second water pipes 322 and 323;
11 Air pump 150 is used to inflate bellows 130 to a desired pressure to maintain the pore walls stable.
According to the construction process and time, the single test process is repeated to test the loose circle of the drilled surrounding rock for many times.
In summary, the embodiment of the application keeps the stability of the wall of the testing hole through the distributed water retention air bag and the distributed telescopic air bag, and adopts a sectional type sound wave testing method, so that the wall of each fixed depth hole is only supported without the air bag in the testing time period, and the repeated use of the loose circle of the surrounding rock of the weak and broken rock mass tunnel by using a single hole is realized.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The utility model provides a weak broken rock mass tunnel pore wall stabilising arrangement which characterized in that includes:
at least two retention balloons;
a first air tube communicating with each of the holding airbags for inflating each of the holding airbags;
at least one telescopic air bag is arranged between two adjacent retaining air bags;
the second air pipe is communicated with each telescopic air bag and is used for inflating and exhausting each telescopic air bag; the telescopic air bags are used for stretching to fill the testing space between two adjacent holding air bags when being inflated and contracting to expose the testing space between two adjacent holding air bags when being deflated;
the holding air bag and the telescopic air bag are both provided with a channel for the test probe to pass through.
2. The weak fractured rock mass tunnel hole wall stabilizing device according to claim 1,
the difference value between the distance between two adjacent holding air bags and the length of the test probe is within a preset range.
3. The weak fractured rock mass tunnel hole wall stabilizing device according to claim 1,
one end of each holding air bag, which is used for the passage of the test probe, opposite to the telescopic air bag is provided with a gradually-changed section, and the section of each holding air bag is gradually increased along the direction close to the telescopic air bag.
4. The weak fractured rock tunnel hole wall stabilizing device according to claim 1, further comprising:
and the two pressure detection devices are respectively connected with the first air pipe and the second air pipe and are used for measuring the gas pressure values in the holding air bag and the telescopic air bag.
5. The utility model provides a weak broken rock mass tunnel country rock pine circle detection device which characterized in that includes:
the bore wall stabilization device of any one of claims 1 to 4, for placement within a test bore to support the test bore;
and the test probe is arranged in the channels of the holding air bags and the telescopic air bags in the test hole stabilizing device and is arranged between two adjacent holding air bags.
6. The weak broken rock mass tunnel surrounding rock looseness ring detection device of claim 5, wherein the test probe comprises:
a body;
an acoustic transmitter and an acoustic receiver coupled to the body;
the first closed water bag and the second closed water bag are respectively connected to two ends of the body and are used for being abutted to the keeping air bag;
and the at least two one-way pressure valves are respectively connected to the first closed water bag and the second closed water bag and arranged facing the test space, and are used for discharging water to the test space when the pressure in the first closed water bag or the second closed water bag is greater than a first preset value.
7. The weak broken rock mass tunnel surrounding rock looseness ring detection device according to claim 6,
the end parts of the holding air bags, which are used for being abutted against the first closed water bag and the second closed water bag, are all arranged to be conical, and the bottom ends of the cones face the testing space;
the first closed water bag and the second closed water bag are in a conical shape, so that the first closed water bag and the second closed water bag are matched with the conical shape of the end part of the holding air bag.
8. The weak broken rock mass tunnel surrounding rock looseness ring detection device of claim 6, further comprising:
and the water pressure detection device is connected to the body and used for measuring the water pressure in the test space between the two holding air bags.
9. The weak broken rock mass tunnel surrounding rock looseness ring detection device of claim 8, further comprising:
the control device is electrically connected with the water pressure detection device and is used for acquiring a pressure value detected by the water pressure detection device;
the control device is also used for being electrically connected with the water filling devices of the first closed water bag and the second closed water bag and controlling the water filling devices to stop filling water into the first closed water bag and the second closed water bag when the pressure value is larger than a second preset value.
10. The weak broken rock mass tunnel surrounding rock looseness ring detection device of claim 6, further comprising:
the first water pipe is communicated with the first closed water bag;
and the second water pipe is communicated with the second closed water bag.
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| CN202210038444.9A CN114370248B (en) | 2022-01-13 | 2022-01-13 | Weak broken rock mass tunnel pore wall stabilising arrangement and surrounding rock looseness circle detection device |
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