CN111827987A - Ground stress testing assembly and using method - Google Patents
Ground stress testing assembly and using method Download PDFInfo
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- CN111827987A CN111827987A CN202010624388.8A CN202010624388A CN111827987A CN 111827987 A CN111827987 A CN 111827987A CN 202010624388 A CN202010624388 A CN 202010624388A CN 111827987 A CN111827987 A CN 111827987A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000009662 stress testing Methods 0.000 title claims description 15
- 238000005553 drilling Methods 0.000 claims abstract description 109
- 238000006243 chemical reaction Methods 0.000 claims abstract description 90
- 239000011435 rock Substances 0.000 claims abstract description 47
- 238000012360 testing method Methods 0.000 claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims description 52
- 238000005259 measurement Methods 0.000 claims description 37
- 230000008569 process Effects 0.000 claims description 31
- 239000000843 powder Substances 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 7
- 230000000295 complement effect Effects 0.000 claims description 3
- 230000002463 transducing effect Effects 0.000 claims 1
- 241001422033 Thestylus Species 0.000 description 8
- 241001449342 Chlorocrambe hastata Species 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 7
- 238000009413 insulation Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
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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
- E21B49/006—Measuring wall stresses in the borehole
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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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
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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
- E21B49/005—Testing the nature of borehole walls or the formation by using drilling mud or cutting data
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Abstract
A ground stress test assembly and a use method thereof relate to the field of rock mechanics test, and comprise a guide hole pore-forming drilling tool, a measuring hole pore-forming drilling tool, a stress relief hole pore-forming drilling tool and a tail connecting assembly; the pilot hole pore-forming drilling tool comprises a first conversion head and a pilot hole drill bit clamped on the first conversion head; the first conversion head can be detachably connected with the tail connecting component; the measuring hole drilling tool comprises a second conversion head and a measuring hole drill bit clamped on the second conversion head, and the second conversion head can be detachably connected with the tail connecting component; the stress relief hole drilling tool comprises a third conversion head and a stress relief hole drill bit clamped on the third conversion head, and the third conversion head can be detachably connected with the tail connecting assembly; each device in the assembly can be assembled with different drilling tools only by replacing the corresponding adapter and the corresponding drill bit, and the assembly is convenient and fast.
Description
Technical Field
The invention relates to the field of rock mechanics testing, in particular to a ground stress testing component designed according to a stress relieving method and a using method of the component.
Background
The characteristics of rock mass ground stress and ground stress fields have important significance for engineering project construction, exploration of physical processes in the earth and mechanism disclosure of earthquake geological disasters. For example, the maximum burial depth of a brocade power station is 2600 meters; the deep geological treatment depth of the nuclear waste reaches 1000 meters; the oil-gas engineering and mine depth reaches 4000 meters; the core military protection project is as deep as 1000 meters. In the deep engineering, high ground stress widely exists, the stress condition of the surrounding rock of the deep engineering is accurately acquired, and the deep ground stress testing method plays an important role in planning, designing and deciding the engineering, so that the deep ground stress testing requirement is more and more prominent.
In the stress test of deep-buried tunnels and underground mines, a common drilling mode is often adopted due to the limitation of a working site, and multiple equipment devices are required to be cooperatively matched one by one, so that the realization of the efficient cooperative matching of the equipment to improve the ground stress test efficiency is always an improved content of projects for engineering technicians.
Disclosure of Invention
The invention provides a new technical scheme aiming at realizing the efficient cooperative cooperation of all devices so as to achieve the aim of improving the working efficiency during the stress test in a deep-buried tunnel and a mine.
The technical scheme provided by the invention is as follows:
a ground stress testing assembly comprises a guide hole pore-forming drilling tool, a measuring hole pore-forming drilling tool, a stress relief hole pore-forming drilling tool and a tail connecting assembly;
the pilot hole pore-forming drilling tool comprises a first conversion head and a pilot hole drill bit clamped on the first conversion head; the first conversion head can be detachably connected with the tail connecting component;
the measuring hole drilling tool comprises a second conversion head and a measuring hole drill bit clamped on the second conversion head, and the second conversion head can be detachably connected with the tail connecting component;
the stress relief hole drilling tool comprises a third conversion head and a stress relief hole drill bit clamped on the third conversion head, and the third conversion head can be detachably connected with the tail connecting assembly.
Further, the tail connecting assembly comprises a thrust ball bearing, an inner pipe body and an outer pipe body, wherein the thrust ball bearing is connected with the inner pipe body, and the thrust ball bearing and the inner pipe body are both arranged in the outer pipe body; the outer tube body is detachably connected with the first conversion head, the second conversion head and the third conversion head respectively.
Further, the pilot hole drill bit includes vertical lip face and slope lip face, the inclination of slope lip face for vertical lip face is A, wherein 30 is ≦ A ≦ 60.
Furthermore, the first conversion head and the second conversion head are respectively provided with a clamping jaw part which protrudes outwards and is in a cone structure, and an angle between a generatrix of the clamping jaw part and an axis of the clamping jaw part is B degrees, wherein the angle between the B degrees and the A degrees is complementary.
Furthermore, the measuring hole pore-forming drilling tool also comprises a bailing pipe body, wherein the bailing pipe body is of a hollow structure, and one end of the bailing pipe body is an opening end; the bailing pipe body and the outer pipe body are detachably connected, and the opening end is arranged at one end, far away from the outer pipe body, of the bailing pipe body.
Furthermore, a plurality of groups of convex drill teeth in an annular structure are arranged on the lip surface of the measuring hole drill bit.
Furthermore, an included angle C is formed between the excircle wall surface and the lip surface of the measuring hole drill, wherein the C is more than or equal to 70 degrees and less than or equal to 85 degrees.
Furthermore, the third conversion head and the stress relief hole drill bit are of an integrally formed structure.
Furthermore, the ground stress testing assembly further comprises a hole wall displacement measuring device, and the diameter of the outer circle of the hole wall displacement measuring device is smaller than that of the inner pipe body, so that the hole wall displacement measuring device is placed in the inner pipe body.
Further, a spearhead is arranged at the tail part of the hole wall displacement measuring device.
Also disclosed is a method of use for a ground stress testing assembly, the method of use comprising the steps of:
and S1, drilling the to-be-tested point by the pilot hole drilling tool, and grinding the conical hole bottom of the pilot hole by the pilot hole drill.
S2: and (3) recovering the pilot hole pore-forming drilling tool and replacing the pilot hole pore-forming drilling tool with a measuring hole pore-forming drilling tool, drilling the measuring hole drill bit along the pilot hole, enabling rock powder formed at the bottom of the cutting hole of the measuring hole drill bit to flow into the sand fishing pipe body along with the circulation of the drilling fluid, and judging the lithology of the ground stress measuring point according to the rock powder by engineering technicians.
S3: the measuring hole pore-forming drilling tool is recovered and replaced with a stress relieving drilling tool to carry out drilling and coring, and the annular core enters the inner tube body through the snap spring in the drilling process and is limited in the inner tube body; and the engineering technician takes out the annular core in the inner tube body, measures the inner diameter of the annular core and judges whether the diameter of the core meets the technical requirements.
If the technical requirements are met, the specification of the measuring hole drill bit is not changed, and S4 is continued;
if the technical requirements are not met, repeating the steps from S1 to S3, and replacing the measuring hole drill bit to drill the measuring hole again in S2 until the measuring hole meets the requirements and then performing S4.
S4: s1 and S2 are repeated, and after the hole measurement is completed, the hole wall displacement measuring device is placed in the measurement hole so that the stylus part on the hole wall displacement measuring device comes into contact with the inner wall of the measurement hole.
S5: and (3) drilling and coring again by using the stress relief drilling tool, wherein the annular core wraps the hole wall displacement measuring device and enters the inner tube body through the snap spring in the drilling process, and the annular core is limited in the inner tube body, and at the moment, the deformation condition of the core in the process is monitored and recorded in real time by using a contact pin component and electronic equipment in the hole wall displacement measuring device.
S6: after drilling is finished, the stress relieving drilling tool is lifted out together with the annular rock core and the hole wall displacement measuring device in the inner pipe body, engineering technicians take out the annular rock core in the inner pipe body and observe whether the rock core is complete, and when the rock core is complete, the whole field test work is finished; and when the core is incomplete, repeating the steps from S4 to S6 until the complete core is taken out.
The beneficial effect that adopts this technical scheme to reach does:
1. the structure is simple; each device in the assembly can be assembled with different drilling tools only by replacing the corresponding adapter and the corresponding drill bit, and the assembly is convenient and fast.
2. The measuring process is convenient; the device is convenient to operate, the measuring method is simple and clear, the measuring efficiency is improved, the measuring time is saved, and the device is suitable for wide popularization.
Drawings
FIG. 1 is a view showing a structure of a pilot hole boring tool.
FIG. 2 is a schematic plan view of a pilot hole drill bit.
Fig. 3 is a block diagram of a measurement hole forming drill.
Fig. 4 is a plan view of a gauge hole bit.
FIG. 5 is a side plan view of a gauge hole bit.
Fig. 6 is a structural view of a stress relief hole forming drill.
Fig. 7 is a plan view of a stress relief hole drill.
Fig. 8 is a structural view of the hole wall displacement measuring apparatus.
Fig. 9 is a diagram showing the distribution of stylus members in the hole wall displacement measuring apparatus.
FIG. 10 is a schematic view of pilot hole formation.
FIG. 11 is a schematic view of a measurement hole formation.
Figure 12 is a schematic view of the hole wall displacement measuring device installed in the measuring hole,
FIG. 13 is a schematic view of a stress relief hole forming drill drilling coring and recovery hole wall displacement measurement device.
FIG. 14 is a flow chart illustrating the use of the ground stress test assembly of the present invention.
Wherein: the device comprises a 10 pilot hole forming drill, a 11 first conversion head, a 12 pilot hole drill, a 20 measuring hole forming drill, a 21 second conversion head, a 22 measuring hole drill, a 23 bailing pipe body, a 30 stress relief hole forming drill, a 31 third conversion head, a 32 stress relief hole drill, a 33 clamp spring, a 40 tail connecting assembly, a 41 thrust ball bearing, a 42 inner pipe body, a 43 outer pipe body, a 50 hole wall displacement measuring device, a 51 contact pin bin outer pipe, a 52 contact pin component, a 53 heat insulation tile, a 54 spearhead and 221 drill teeth.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The embodiment provides a ground stress testing assembly, and referring to fig. 1 to 9, the ground stress testing assembly is composed of a plurality of parts, and the ground stress testing assembly realizes the testing work of the ground stress through the sequential cooperative work of the parts; specifically, the ground stress testing assembly comprises a pilot hole pore-forming drilling tool 10, a measuring hole pore-forming drilling tool 20, a stress relief hole pore-forming drilling tool 30, a tail connecting assembly 40 and a pore wall displacement measuring device 50.
Referring to fig. 1, 3 and 6, the pilot hole drilling tool 10 is used for forming a pilot hole, and specifically comprises a first conversion head 11 and a pilot hole drill bit 12 clamped on the first conversion head 11; the measuring hole drilling tool 20 is used for realizing the formation of a measuring hole, and specifically comprises a second conversion head 21 and a measuring hole drill 22 clamped on the second conversion head 21; the stress relief hole forming drill 30 is used for drilling and coring and comprises a third conversion head 31 and a stress relief hole drill 32 clamped on the third conversion head 31; the first conversion head 11, the second conversion head 21 and the third conversion head 31 are detachably connected with the tail connecting assembly 40 respectively.
The first conversion head 11, the second conversion head 21 and the third conversion head 31 are detachably connected with the tail connection assembly 40 respectively, it can be understood that a power output member matched with the first conversion head 11, the second conversion head 21 and the third conversion head 31 is arranged on the tail connection assembly 40, the first conversion head 11, the second conversion head 21 and the third conversion head 31 can be simultaneously arranged on the power output member arranged on the tail connection assembly 40 and can be detached, two of the three conversion heads can be simultaneously arranged on the power output member arranged on the tail connection assembly 40 and can be detached, and the two conversion heads can be independently arranged on the tail connection assembly 40 and can be detached.
It should be noted that when two or three shifting heads are simultaneously arranged on the tail connecting assembly 40, a switching mechanism should be arranged in the tail connecting assembly 40, and the switching mechanism is used for realizing switching between the shifting heads so as to ensure that the rest drill bits do not affect the working drill bits during each operation; for example, after the pilot hole is formed, the switching mechanism is started to enable the first switching head 11 to realize the recovery of the pilot hole drill bit 12; meanwhile, the switching mechanism drives the second switching head 21 to a working position, so that the drilling work of the measuring hole drill 22 is facilitated; similarly, after the measuring hole is formed, the conversion mechanism rotates to enable the measuring hole drill bit 22 to be recovered and simultaneously enable the stress relief hole drill bit 32 to rotate to the working position, the conversion between the drill bits is realized through the conversion mechanism, and interference influence between the drill bits can be avoided while normal work is guaranteed.
However, in the present embodiment, the first conversion head 11, the second conversion head 21, the third conversion head 31 and the power output element of the tail connection assembly 40 are separately installed and respectively realized to be detachable; namely, when the engineering technician needs to process the forming of the guide hole, the first conversion head 11 is installed on the power output part of the tail connecting assembly 40, and then the guide hole drill bit 12 and the first conversion head 11 are fixed to form the guide hole; after the pilot hole is formed, the first conversion head 11 and the pilot hole drill bit 12 are taken down, the second conversion head 21 and the measuring hole drill bit 22 are replaced, and the second conversion head 21 is fixed on a power output part of the tail connecting assembly 40 to realize drilling and forming of the measuring hole; similarly, when the drilling coring is required, the second conversion head 21 is removed and replaced with the third conversion head 31, and the stress relief hole bit 32 and the third conversion head 31 are fixed.
Through the above arrangement, the assembly of different drilling tools can be completed only by replacing the corresponding adapter and the drill bit, the operation is simple and convenient, the working efficiency is improved, and the stability in the drilling process can be ensured.
In this embodiment, the tail connecting assembly 40 includes a thrust ball bearing 41, an inner tube 42 and an outer tube 43, the thrust ball bearing 41 is connected to the inner tube 42, and the thrust ball bearing 41 and the inner tube 42 are both disposed in the outer tube 43, where the thrust ball bearing 41 is connected to the inner tube 42 for ensuring the inner tube 42 to be stable; the first conversion head 11, the second conversion head 21 and the third conversion head 31 are respectively detachably connected to the outer tube 43, the rotation of the outer tube 43 is realized by a transmission rod (not shown), that is, the transmission rod (not shown) is driven to rotate the outer tube 43, and the rotation of the outer tube 43 enables the first conversion head 11, the second conversion head 21 or the third conversion head 31 to rotate so as to realize a corresponding drilling process; it will be appreciated that the outer tube 43 and drive rod (not shown) described herein are the power take-offs of the tail connector assembly 40 described above.
The pilot hole bit 12 of the present embodiment functions to grind the hole bottom and further drill into a pilot hole having a tapered configuration, see fig. 1, 2, 10, so that the lip surface of the pilot hole bit 12 includes a vertical lip surface and an inclined lip surface, the inclined lip surface having an inclination angle a ° with respect to the vertical lip surface, wherein 30 ° or more and a ° or less than 60 °; the guiding hole with the conical structure is beneficial to realizing the guiding effect on the subsequent measuring hole drill bit 22, and the measuring hole drill bit 22 can more easily and directly enter the guiding hole to drill the measuring hole.
Preferably, a water outlet hole is formed in the pilot hole drill bit 12, and drilling fluid is introduced into the water outlet hole to cool and lubricate the pilot hole drill bit 12.
After the pilot hole is formed, the next step of drilling the measuring hole is required, in this embodiment, after the pilot hole drilling tool 10 is removed, the second conversion head 21 is mounted on the outer tube 43, and then the measuring hole drill 22 and the second conversion head 21 are fixed to realize the drilling of the measuring hole.
In this embodiment, referring to fig. 2-5 and 11, the first conversion head 11 and the second conversion head 21 are each provided with a jaw portion protruding outward in a cone structure, and a corresponding drill bit can be gripped more stably by the jaw portion, and preferably, a generatrix of the jaw portion forms an angle of B ° with an axis thereof, where B ° is complementary to a °; the angle B degree is designed to perfectly fit the second conversion head 21 with the conical inclined surface in the guide hole in the measuring hole drilling process, and simultaneously, the guide hole is prevented from being damaged due to the hard collision between the clamping jaw part and the rock in the drilling process or the measuring hole drilling process.
Similarly, the measuring hole drill bit 22 is provided with a water outlet hole for the drilling fluid to flow out, so that the problem that the temperature of the measuring hole drill bit 22 is too high during working is avoided, and the drilling fluid is used for lubricating and cooling in the drilling process.
The primary purpose of the metering hole drill bit 22 is to drill a metering hole having a desired hole diameter range, thereby imposing stringent requirements on the diameter range of the hole to be formed; in order to meet the drilling requirement, in the embodiment, a plurality of groups of convex drill teeth 221 in an annular structure are designed on the lip surface of the measuring hole drill bit 22, and the drill teeth 221 are not only beneficial to ensuring the smooth drilling of the measuring hole, but also beneficial to the centering effect of the measuring hole drill bit 22 in the drilling process and reducing the vibration swing amplitude.
Meanwhile, in the process of drilling rock by rotationally cutting the measuring hole drill bit 22, in order to reduce the influence of the expansion of the hole diameter of the measuring hole caused by the resonance swing of the measuring hole drill bit 22, an included angle C is formed between the excircle wall surface and the lip surface of the measuring hole drill bit 22, wherein the C is more than or equal to 70 degrees and less than or equal to 85 degrees.
It can be understood that the diameter of the outer circumferential wall surface of the measurement hole drill 22 is smaller than the diameter of the lip surface to reduce the influence of the resonance oscillation on the measurement hole, so that only the lip surface is in contact with the rock to ensure the forming precision of the measurement hole in the drilling process of the measurement hole drill 22.
Considering that in the drilling process of the measuring hole, engineering technicians need to adopt the generated rock powder to judge the lithology at the testing point, the measuring hole pore-forming drilling tool 20 further comprises a bailing pipe body 23, wherein the bailing pipe body 23 is of a hollow structure, and one end of the bailing pipe body is an open end; in the process of installing the measuring hole drilling tool 20, after the second conversion head 21 and the measuring hole drill 22 are installed, the other end of the outer tube 43 should be connected with the bailing tube 23; during the drilling process of the measuring hole, rock powder generated by the rock flows along with the drilling fluid and flows through the gap between the outer pipe body 43 and the hole wall to the open end of the bailing pipe body and then falls back into the bailing pipe, so that the rock powder is collected, and engineering technicians can judge the lithology of the stratum with the ground stress test purpose according to the rock powder.
After the measurement hole is formed, the third conversion head 31 and the stress relief hole drill bit 32 in the stress relief hole forming drill 30 are installed next, and the rock core is drilled by the stress relief hole drill bit 32.
Preferably, referring to fig. 6 to 7, the third conversion head 31 and the stress relief hole drill 32 are of an integral structure, and in order to ensure the integrity of the annular core during drilling, a plurality of sets of protruding racks are designed on the lip surface of the stress relief hole drill 32 to ensure smooth drilling during drilling stress relief.
After the stress relief hole forming drill 30 is connected with the outer pipe 43, the inner pipe 42 is communicated with the inner hole of the stress relief hole forming drill 30 to form a channel, the continuous drilling of the stress relief hole drill 32 can enable the rock core with the measuring hole to enter the inner pipe 42 through the channel, and the rock core entering the inner pipe 42 is collected by engineering technicians to check whether the measuring hole in the rock core meets the requirement.
In this embodiment, in order to smoothly collect the core in the drill bushing process, a plurality of snap springs 33 are arranged in the third conversion head 31, the plurality of snap springs 33 are distributed on the inner annular wall of the third conversion head 31, and the snap springs 33 are mainly used for enabling the above-mentioned passage to form a single passage which can only move towards the inner pipe body 42; when the stress relief hole drill bit 32 drills into and cuts the rock, the rock core can gradually enter the inner pipe body 42 through the clamp spring 33, in the entering process, the clamp spring 33 outwards expands under the squeezing action of the rock core to enable the rock core to smoothly enter, after the rock core smoothly enters the inner pipe body 42, the clamp spring 33 rebounds to enable the rock core to be limited by the clamp spring 33 and not to fall out of the inner pipe body 42, and therefore smooth rock core collection is guaranteed.
After the core is collected, the measurement hole in the core needs to be measured, whether the size of the measurement hole meets the requirement or not is detected, and the purpose of measurement is to determine whether the hole wall displacement measurement device 50 can smoothly enter the measurement hole or not.
Specifically, referring to fig. 8-9 and 12, the hole wall displacement measuring device 50 includes a stylus chamber outer tube 51 and a plurality of stylus components 52, the plurality of stylus components 52 are uniformly and annularly arranged on the stylus chamber outer tube 51, and the contact tips of the stylus components 52 penetrate through the outer circular wall of the stylus chamber outer tube 51 to form a test ring; it is noted that the measurement of the measurement hole is dimensioned such that the stylus housing tube 51 with the stylus part 52 can be placed in the measurement hole and the stylus part 52 stylus can contact the rock bore wall of the measurement hole.
If the measurement hole is unqualified, the dimension of the measurement hole drill bit 22 is larger or smaller, the guide hole drilling and the measurement hole drilling are required to be performed again in sequence, and the measurement hole detection is performed again by utilizing the operation of the stress relief hole forming drill sleeve; in the process of drilling the measuring hole, the measuring hole drill 22 needs to be changed into a large-size or small-size measuring hole drill 22, so that the size of the final measuring hole meets the test ring formed by the contact pin part 52 on the hole wall displacement measuring device 50, and especially, the contact pin part 52 can smoothly enter the measuring hole.
If the measurement hole test is qualified and meets the entry requirement of the hole wall displacement measurement device 50, it can be understood that the measurement hole drill 22 meets the requirement, and at this time, only the pilot hole drilling and the measurement hole drilling need to be performed again, and at this time, after the measurement hole is formed, the hole wall displacement measurement device 50 is directly knocked into the formed measurement hole.
Preferably, in order to facilitate the engineering technician to lower the hole wall displacement measuring device 50, the tail of the hole wall displacement measuring device 50 is further provided with a spearhead 54, the spearhead 54 is used for being connected with a rope core fisher (not shown), the connection between the rope core fisher (not shown) and the spearhead is used for lowering the hole wall displacement measuring device 50 into the measuring hole, after the hole wall displacement measuring device 50 is located in the measuring hole, a release latch (not shown) is lowered to release the spearhead on the hole wall displacement measuring device 50 from the rope core fisher and take out the rope core fisher, and at this time, the contact pin part 52 on the hole wall displacement measuring device 50 is already completely located in the measuring hole.
In order to accurately measure the ground stress, the hole wall displacement measuring device 50 further comprises a heat insulation tile 53 arranged inside the outer tube 51 of the contact pin bin, various electronic devices such as a camera, a data storage device, a voltage stabilizing filter and the like are arranged inside the heat insulation tile 53, and a high-temperature resistant power supply battery can also be arranged inside the heat insulation tile 53; the heat insulation tile 53 is mainly used for protecting electronic components inside the hole wall displacement measuring device 50 from the high temperature of the deep hole.
After the hole wall displacement measuring device 50 is stably placed in the measuring hole, the stress relief hole forming drilling tool 30 is used for drilling to realize the collection of the rock core, and in the drilling process, the change of the hole diameter of the measuring hole can be accurately sensed by a contact pin component 52 arranged on an outer tube 51 of a contact pin bin; specifically, before the drilling and coring process, the contacts of the plurality of contact pin components 52 form a standard test ring with a circular structure on the outer tube 51 of the contact pin bin, and the test ring is adaptive to the size of the measurement hole, so that the contacts of the contact pin components 52 are in contact with the inner wall of the measurement hole, and a rock core can deform during the drilling and coring process; along with the deformation of the rock core, at least part of the contact pin part 52 can displace along with the deformation of the rock core, the deformation reflects the displacement condition of the corresponding point of the rock core, the camera of the hole wall displacement measuring device 50 records the needle tip displacement condition of the contact pin part 52 in real time, and the magnitude and the direction of the ground stress at the target layer are solved according to the existing theory and calculation formula and by combining the actually measured needle tip displacement data and the physical and mechanical property parameters of the rock at the ground stress measuring point.
Preferably, in this embodiment, the diameter of the outer circle of the hole wall displacement measuring device 50 is smaller than the diameter of the inner tube 42, so as to facilitate the retraction of the hole wall displacement measuring device 50 located in the measuring hole.
The specific operation mode is as follows: referring to fig. 12 to 13, after the hole wall displacement measuring device 50 is smoothly placed in the measuring hole, the core is drilled by using the stress relief hole forming drilling tool 30, the hole wall displacement measuring device 50 located in the measuring hole enters the inner pipe body 42 together with the core during the drilling process, and under the action of the clamp spring 33, the core and the hole wall displacement measuring device 50 located in the inner pipe body 42 cannot slide out, so that the core and the hole wall displacement measuring device 50 can be smoothly collected by engineering technicians.
Referring to fig. 10-14, the ground stress test assembly provided by the invention has the following specific use steps:
the first step is as follows:
the pilot hole pore-forming drilling tool 10 drills into a point to be tested, and the pilot hole drill bit 12 polishes the conical hole bottom of the pilot hole.
The second step is that:
taking down the first conversion head 11 and the pilot hole drill bit 12, and installing a measuring hole forming drill 20 on the outer pipe body 43 of the tail connecting assembly 40, wherein the measuring hole drill bit 22 drills along the pilot hole; rock powder formed by cutting rock at the bottom of the hole by the measuring hole drill bit 22 flows into the bailing pipe body 23 along with the circulation of the drilling fluid, and an engineering technician judges the lithology at the ground stress measuring point according to the rock powder.
The third step:
the stress relief hole pore-forming drilling tool 30 drills and cores, and in the drilling process, the annular core enters the inner pipe body 42 through the clamp spring 33 and is limited in the inner pipe body 42; an engineering technician takes out the annular core in the inner pipe body 42, measures the inner diameter of the annular core, and judges whether the core diameter meets the technical requirements.
If the technical requirements are met, the specification of the measuring hole drill 22 is not changed, and the fourth step is continued;
and if the technical requirements are not met, repeating the first step to the third step again, replacing the small-size or large-size measuring hole drill 22 in the second step to drill the measuring hole again until the measuring hole meets the requirements, and then performing the fourth step.
The fourth step:
the first step and the second step are repeated, and after the completion of the measurement hole, the hole wall displacement measuring device 50 is placed into the measurement hole by the spearhead 54 so that the stylus part on the hole wall displacement measuring device 50 is brought into contact with the inner wall of the measurement hole.
The fifth step:
the stress relief hole pore-forming drilling tool 30 drills and cores, the annular core wraps the hole wall displacement measuring device 50 in the drilling process, enters the inner pipe body 42 through the clamp spring 33, and is limited in the inner pipe body 42, and at the moment, the deformation condition of the core in the process is monitored and recorded in real time by the contact pin component 52 and the electronic equipment in the hole wall displacement measuring device 50.
And a sixth step:
after drilling is finished, the stress relief hole pore-forming drilling tool 30 is lifted out together with the annular core and the pore wall displacement measuring device 50 in the inner pipe body 42, engineering technicians take out the annular core in the inner pipe body 42 and observe whether the core is complete, and when the core is complete, the whole field test work is finished; and returning to the fourth step when the core is incomplete until the complete core is taken out.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The ground stress testing assembly is characterized by comprising a guide hole pore-forming drilling tool (10), a measuring hole pore-forming drilling tool (20), a stress relief hole pore-forming drilling tool (30) and a tail connecting assembly (40);
the pilot hole pore-forming drilling tool (10) comprises a first conversion head (11) and a pilot hole drill bit (12) clamped on the first conversion head (11); the measuring hole pore-forming drilling tool (20) comprises a second conversion head (21) and a measuring hole drill bit (22) clamped on the second conversion head (21), and the stress relief hole pore-forming drilling tool (30) comprises a third conversion head (31) and a stress relief hole drill bit (32) clamped on the third conversion head (31);
the first conversion head (11), the second conversion head (21) and the third conversion head (31) can be detachably connected with the tail connecting component (40) respectively.
2. Ground stress test assembly according to claim 1, wherein the tail connection assembly (40) comprises a thrust ball bearing (41), an inner body (42) and an outer body (43), the thrust ball bearing (41) being connected with the inner body (42) and the thrust ball bearing (41) and the inner body (42) being both arranged within the outer body (43); the outer tube body (43) is detachably connectable to the first, second and third transducing heads (11, 21, 31), respectively.
3. The ground stress test assembly according to claim 1 or 2, wherein the pilot hole drill bit (12) comprises a vertical lip and an inclined lip, the inclined lip being inclined at an angle a ° relative to the vertical lip, wherein 30 ° ≦ a ° ≦ 60 °.
4. The ground stress testing assembly according to claim 1 or 2, wherein the measuring hole pore-forming drilling tool (20) further comprises a bailing tube body (23), the bailing tube body (23) is of a hollow structure, and one end of the bailing tube body is an open end; the bailing pipe body (23) is detachably connected with the outer pipe body (43), and the opening end is arranged at one end, far away from the outer pipe body (43), of the bailing pipe body (23).
5. The ground stress test assembly according to claim 3, wherein the first conversion head (11) and the second conversion head (21) are provided with clamping jaw portions protruding outwards in a cone structure, and the generatrix of each clamping jaw portion forms an angle B ° with the axis of the clamping jaw portion, wherein the angle B ° is complementary to the angle A °.
6. The ground stress test assembly according to claim 1, wherein the lip surface of the measurement hole bit (22) is provided with a plurality of sets of outwardly convex and annular-structured drill teeth (221).
7. The ground stress test assembly of claim 1, wherein the outer circumferential wall surface of the gauge hole bit (22) forms an angle C ° with the lip surface, wherein 70 ° C ° 85 °.
8. The ground stress test assembly of claim 1, wherein the third conversion head (31) is of an integrally formed structure with the stress relief bore bit (32).
9. The ground stress testing assembly of claim 1, further comprising a bore wall displacement measuring device (50), an outer diameter of the bore wall displacement measuring device (50) being smaller than a diameter of the inner tube (42) such that the bore wall displacement measuring device (50) is disposed within the inner tube (42).
10. A use method of a ground stress test assembly is characterized by comprising the following steps:
s1, drilling the pilot hole forming drilling tool (10) into the point to be tested, and grinding the pilot hole to form a conical hole bottom by the pilot hole drill bit (12);
s2: the pilot hole pore-forming drilling tool (10) is recovered and replaced with a measuring hole pore-forming drilling tool (20), a measuring hole drill bit (22) drills along the pilot hole, rock powder formed by the measuring hole drill bit (22) cutting rock at the bottom of the hole flows into a bailing pipe body (23) along with circulation of drilling fluid, and engineering technicians judge the lithology at the ground stress measuring point according to the rock powder;
s3: the measuring hole pore-forming drilling tool (20) is recovered and replaced with a stress relief drilling tool (30) for drilling and coring, and the annular rock core enters the inner pipe body (42) through the clamp spring (33) in the drilling process and is limited in the inner pipe body (42); an engineering technician takes out the annular core in the inner pipe body (42), measures the inner diameter of the annular core and judges whether the diameter of the core meets the technical requirements;
if the technical requirements are met, the specification of the measuring hole drill bit (22) is not changed, and S4 is continued;
if the technical requirements are not met, repeating the steps from S1 to S3 again, replacing the measuring hole drill 22 in the step S2 to drill the measuring hole again, and carrying out the step S4 after the measuring hole meets the requirements;
s4: repeating the steps S1 and S2, and placing the hole wall displacement measuring device (50) into the measuring hole after the hole is measured, so that the contact pin component on the hole wall displacement measuring device (50) is contacted with the inner wall of the measuring hole;
s5: the stress relieving drilling tool (30) drills and cores again, the annular core wraps the hole wall displacement measuring device (50) and enters the inner pipe body (42) through the clamp spring (33) in the drilling process, and the annular core is limited in the inner pipe body (42), and at the moment, a contact pin component (52) and electronic equipment in the hole wall displacement measuring device (50) monitor and record the deformation condition of the core in the process in real time;
s6: after drilling is finished, the stress relieving drilling tool (30) is lifted together with the annular rock core in the inner pipe body (42) and the hole wall displacement measuring device (50), engineering technicians take out the annular rock core in the inner pipe body (42) and observe whether the rock core is complete, and when the rock core is complete, the whole field test work is finished; repeating S4-S6 when the core is incomplete until the complete core is removed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010624388.8A CN111827987A (en) | 2020-06-30 | 2020-06-30 | Ground stress testing assembly and using method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010624388.8A CN111827987A (en) | 2020-06-30 | 2020-06-30 | Ground stress testing assembly and using method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113049161A (en) * | 2021-03-22 | 2021-06-29 | 中国矿业大学 | Intelligent device for stress relief ground stress measurement and use method thereof |
| CN113605886A (en) * | 2021-09-30 | 2021-11-05 | 中国科学院武汉岩土力学研究所 | Deep drilling complex environment local wall stress relieving method test system |
| CN113982515A (en) * | 2021-10-28 | 2022-01-28 | 中国地质大学（北京） | Pressure-maintaining coring device |
| CN114718464A (en) * | 2022-03-22 | 2022-07-08 | 中国矿业大学 | Primary hole forming device and method for ground stress test |
| CN115522921A (en) * | 2022-11-25 | 2022-12-27 | 云南省交通发展投资有限责任公司 | System and method for measuring ground stress of ultra-deep drilling hole |
| US11761864B2 (en) | 2021-12-17 | 2023-09-19 | Saudi Arabian Oil Company | Thick-wall cylinder experiment setup for wellbore stability analysis |
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2020
- 2020-06-30 CN CN202010624388.8A patent/CN111827987A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113049161A (en) * | 2021-03-22 | 2021-06-29 | 中国矿业大学 | Intelligent device for stress relief ground stress measurement and use method thereof |
| CN113605886A (en) * | 2021-09-30 | 2021-11-05 | 中国科学院武汉岩土力学研究所 | Deep drilling complex environment local wall stress relieving method test system |
| CN113605886B (en) * | 2021-09-30 | 2022-01-14 | 中国科学院武汉岩土力学研究所 | Deep drilling complex environment local wall stress relieving method test system |
| CN113982515A (en) * | 2021-10-28 | 2022-01-28 | 中国地质大学（北京） | Pressure-maintaining coring device |
| US11761864B2 (en) | 2021-12-17 | 2023-09-19 | Saudi Arabian Oil Company | Thick-wall cylinder experiment setup for wellbore stability analysis |
| CN114718464A (en) * | 2022-03-22 | 2022-07-08 | 中国矿业大学 | Primary hole forming device and method for ground stress test |
| CN115522921A (en) * | 2022-11-25 | 2022-12-27 | 云南省交通发展投资有限责任公司 | System and method for measuring ground stress of ultra-deep drilling hole |
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