CN220151344U - Underground static detection device for sound velocity test - Google Patents
Underground static detection device for sound velocity test Download PDFInfo
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- CN220151344U CN220151344U CN202321705345.8U CN202321705345U CN220151344U CN 220151344 U CN220151344 U CN 220151344U CN 202321705345 U CN202321705345 U CN 202321705345U CN 220151344 U CN220151344 U CN 220151344U
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- 238000001514 detection method Methods 0.000 title claims abstract description 52
- 230000003068 static effect Effects 0.000 title claims abstract description 52
- 238000012360 testing method Methods 0.000 title claims abstract description 22
- 239000000523 sample Substances 0.000 claims abstract description 65
- 230000007246 mechanism Effects 0.000 claims abstract description 29
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 238000000926 separation method Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 7
- 239000010410 layer Substances 0.000 description 24
- 238000011835 investigation Methods 0.000 description 7
- 238000005553 drilling Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Geophysics And Detection Of Objects (AREA)
Abstract
The utility model discloses an underground static detection device for sound velocity testing, which comprises a drill bit, a drill rod, a probe rod and an underground static detection driving mechanism, wherein the drill rod is of a cylinder structure with a through hole, an annular cavity is further arranged in the drill rod, the lower end of the drill rod is fixedly connected with the drill bit, the drill bit is arranged around the through hole, the underground static detection driving mechanism penetrates through the through hole and is fixedly connected with the probe rod, one end of the probe rod is fixedly connected with the underground static detection driving mechanism, the other end of the probe rod is positioned outside the through hole and is provided with a probe for penetrating the probe rod into a target geological layer, the underground static detection driving mechanism is used for driving the probe rod to advance or retreat, an acoustic transmitter is arranged in the annular cavity of the drill rod, a first acoustic receiver and a second acoustic receiver are arranged at intervals at one end of the probe rod far away from the through hole, and the interval distance between the first acoustic receiver and the second acoustic receiver is kept fixed. The utility model improves the accuracy of sound velocity measurement of the target geological layer.
Description
Technical Field
The utility model relates to the technical field of static sounding, in particular to an underground static sounding device for sound velocity testing.
Background
In physical property parameter tests of sediments such as marine resource investigation, submarine geological disaster hidden trouble investigation and submarine rock soil, marine static sounding is complemented with drilling sampling and indoor tests, and is the most direct and effective in-situ test method, which occupies the dominant position of marine engineering investigation technical means and is listed as a necessary project of marine engineering investigation by a plurality of countries. The ocean engineering is to realize fine investigation, and the static sounding based on an in-situ test form is an important technical path, is an important growth point of future ocean fine investigation, and is in wide market space.
Currently, for a sound velocity testing device applied to actual engineering investigation of geologic layers such as sediments, most of sound wave transmitting probes (namely sound wave transmitting transducers) are fixedly arranged on a shallow surface layer of the seabed, sound wave receivers are arranged on a probe rod, and the sound wave transmitting probes and the sound wave receivers are arranged at a separation interval. With the increase of the drilling depth, the first distance between the sound wave transmitting probe and the sound wave receivers is gradually increased, and the second distance between the two fixed sound wave receivers is kept unchanged, so that the ratio of the second distance to the first distance is continuously decreased, the average sound velocity of longitudinal waves measured by the sound wave transmitting probe is further and further inaccurate due to the influence of propagation attenuation, and the measurement effect is continuously deteriorated. Therefore, the existing static detection device for measuring in-situ parameters such as sound velocity is insufficient in measurement accuracy due to unreasonable structural design.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model aims to provide a downhole static sounding device for sound velocity test, which can solve the technical problems described in the background art.
The technical scheme for realizing the purpose of the utility model is as follows: the underground static detection device for sound velocity test includes drill bit, drill rod, probe rod and underground static detection driving mechanism, the drill rod is cylinder structure with through hole, and in the drill rod an annular cavity is set, i.e. a closed cylinder structure including annular cavity is set in the periphery of the through hole, the lower end of the drill rod is fixedly connected with drill bit, the drill bit is set around the through hole,
the underground static detection driving mechanism passes through the through hole and is fixedly connected with the detection rod, one end of the detection rod is fixedly connected with the underground static detection driving mechanism, the other end of the detection rod is positioned outside the through hole and is provided with a probe which is used for penetrating the detection rod into a target geological layer, the underground static detection driving mechanism is used for driving the detection rod to advance or retreat so as to enable the probe on the detection rod to penetrate into the target geological layer,
an acoustic transmitter is arranged in the annular cavity of the drill rod,
the probe is provided with first sound wave receiver and second sound wave receiver on the one end that keeps away from the through-hole, and first sound wave receiver and second sound wave receiver interval setting and interval distance between the two keep fixed.
Further, one end of the probe rod is positioned outside or inside the through hole and fixedly connected with the downhole static detection driving mechanism.
Further, the through hole is provided along the axial extension of the drill rod.
Further, the downhole static detection driving mechanism is arranged along the axial direction of the through hole.
Further, the sonic transmitter is fixedly or detachably mounted in the annular cavity of the drill rod.
Further, the separation distance between the first acoustic wave receiver and the second acoustic wave receiver is kept fixed.
Further, the two sound wave receivers are fixed on the probe rod or can synchronously move along the probe rod, and the interval distance between the two sound wave receivers is always kept unchanged.
Further, the drill bit is screwed onto the drill rod.
Further, the drill rod is provided with a plurality of acoustic transmitters mounted in the annular cavity of the drill rod closest to the probe rod.
Further, the probe rod is a cylindrical rod, the drill rod is of a cylindrical structure, and the axis of the static probe driving mechanism, the axis of the probe rod and the axis of the drill rod are coincident and located on the same straight line.
The beneficial effects of the utility model are as follows: the utility model has simple structure, stable connection relation, easy maintenance and low cost, and the sound wave transmitter is arranged at one end of the drill bit close to the probe rod, so that the distance between the sound wave transmitter and the sound wave receiver is shorter, the sound velocity measurement precision of a target geological layer can be improved, the attenuation of sound waves caused by long-distance propagation is avoided, and the problem that the sound wave measurement effect is poor or even fails can be avoided.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is an assembled schematic view of a drill rod and drill bit connection;
FIG. 3 is a schematic cross-sectional view of a drill rod in a transverse direction;
in the figure, a 1-downhole static detection driving mechanism, a 2-drill rod, a 3-sound wave transmitter, a 4-drill bit, a 5-first sound wave receiver, a 6-second sound wave receiver and a 7-probe rod are arranged.
Detailed Description
The utility model is further described with reference to the accompanying drawings and detailed description below:
as shown in fig. 1-3, an underground static detection device for sonic velocity test comprises a drill bit 4, a drill rod 2, a probe rod 7 and an underground static detection driving mechanism 1, wherein the drill rod 2 is of a cylinder structure with a through hole, the through hole extends along the axial direction of the drill rod 2, an annular cavity is further arranged in the drill rod 2, namely, a closed cylinder structure comprising the annular cavity is arranged at the periphery of the through hole, the lower end of the drill rod 2 is fixedly connected with the drill bit 4, namely, the lower end of the closed cylinder structure is fixedly connected with the drill bit 4, and the drill bit 4 is arranged around the through hole. The downhole static detection driving mechanism 1 penetrates through the through hole and is fixedly connected with the detection rod 7, the downhole static detection driving mechanism 1 is arranged along the axial direction of the through hole, one end of the detection rod 7 is located outside or inside the through hole and is fixedly connected with the downhole static detection driving mechanism 1, a probe is arranged at the other end of the detection rod 7 located outside the through hole and is used for driving the detection rod 7 into a target geological layer, the downhole static detection driving mechanism 1 is used for driving the detection rod 7 to advance or retreat, namely, the detection rod 7 is driven to advance towards the target geological layer (such as sediment) along with the drill bit 4 or retreat away from the target geological layer, and therefore the probe on the detection rod 7 is enabled to penetrate into the target geological layer.
An acoustic transmitter 3 is mounted in the annular cavity of the drill rod 2, and the acoustic transmitter 3 is fixedly or detachably mounted in the annular cavity of the drill rod 2, for example, the acoustic transmitter 3 is transversely mounted on the side wall of the annular cavity.
The probe rod 7 is provided with the first sound wave receiver 5 and the second sound wave receiver 6 on the one end that keeps away from the through-hole, namely is provided with two sound wave receivers on the other end that is located the through-hole outside, and the interval distance between the first sound wave receiver 5 and the second sound wave receiver 6 keeps fixed. For example, two sonic receivers may be fixed to the probe 7 or they may be moved synchronously along the probe 7, but the separation distance between the two sonic receivers remains constant throughout.
Wherein the drill bit 4 can be screwed onto the drill rod 2. When a plurality of drill rods 2 are arranged, and the drill rods 2 are staggered in height, annular cavities are only required to be arranged on the lowest drill rod 2, the rest of the drill rods 2 can keep a solid structure, and the acoustic wave transmitter 3 is arranged in the annular cavities of the lowest drill rod 2. The acoustic transmitter 3 is installed in the annular cavity of the lowermost drill rod 2, so that the sound velocity change of the target geological layer (e.g. sedimentary layer) can still be measured layer by layer with the progressive increase of the drilling depth, i.e. the penetration depth.
In an alternative embodiment, the probe 7 is a cylindrical rod, and the line connecting the centers of the circles is the center line (i.e., the axis) of the probe 7. The drill rod 2 is also in a cylindrical structure, the downhole static detection driving mechanism 1 penetrates through a through hole of the drill rod 2, and the axis of the static detection driving mechanism, the axis of the probe rod 7 and the axis of the drill rod 2 are overlapped and located on the same straight line.
When the downhole static probe device for sound velocity testing is actually used, the following steps are carried out:
step 1: the drill bit 4, the drill rod 2, the probe rod 7, the sound wave transmitter 3, the sound wave receiver and the downhole static detection driving mechanism 1 are assembled.
Step 2: after the assembly is completed, the downhole static detection device is sent into the submarine target geological formation under the action of an external device, so that the drill bit 4 can drill into the target geological formation, and in the drilling process, the downhole static detection driving mechanism 1 synchronously drives the probe to move away from the drill rod 2 and drill down into the target geological formation.
Step 3: the probe drills into the appointed depth to reach a certain depth layer of the geological layer, the penetration of the drill bit 4 and the probe is stopped, the sending time of the sound wave signals sent by the sound wave transmitter 3 and the time of the sound wave signals received by the first sound wave receiver 5 and the second sound wave receiver 6 are recorded, and the average longitudinal wave sound velocity of the current depth layer is calculated according to the formula (1):
wherein, referring to FIG. 1, R 0 Represents the vertical distance of the acoustic wave emitter 3 to the probe 7, i.e. the straight line distance between the acoustic wave emitter 3 and the projection point of the acoustic wave emitter 3 onto the axis of the probe 7, d represents the distance of said projection point to the first acoustic wave receiver 5, the first acoustic wave receiver 5 being close to the drillAcoustic wave receiver, D, of head 4 and acoustic wave emitter 3 0 Representing the distance between the first sound wave receiver 5 and the second sound wave receiver 6, dt represents the time difference of arrival of the sound wave signal at the first sound wave receiver 5 and the second sound wave receiver 6, respectively.
Step 4: and continuously driving the drill rod 2 to downwards tunnel the target geological layer, and jumping to execute the step 3 until the average longitudinal wave speed of each layer on all the target geological layers is measured after the underground static detection driving mechanism 1 drives the probe to reach the next depth layer.
By repeatedly executing the step 3 and the step 4, the probe can follow the tunneling process of the drill bit 4, and the average longitudinal wave speed on the target geological layer can be measured layer by layer under the condition of while-drilling, so that the average longitudinal wave speed of each layer can be measured.
The utility model has simple structure and arrangement, stable connection relation, easy maintenance and low cost, and the sound wave emitter 3 is arranged at one end of the drill bit 4 close to the probe rod 7, so that the distance between the sound wave emitter 3 and the sound wave receiver is shorter, the sound velocity measurement precision of a target geological layer can be improved, the attenuation of sound waves caused by long-distance propagation is avoided, and the problem that the sound wave measurement effect is poor or even fails can be avoided.
The embodiment disclosed in the present specification is merely an illustration of one-sided features of the present utility model, and the protection scope of the present utility model is not limited to this embodiment, and any other functionally equivalent embodiment falls within the protection scope of the present utility model. Various other corresponding changes and modifications will occur to those skilled in the art from the foregoing description and the accompanying drawings, and all such changes and modifications are intended to be included within the scope of the present utility model as defined in the appended claims.
Claims (10)
1. The underground static detection device for sound velocity test is characterized by comprising a drill bit, a drill rod, a probe rod and an underground static detection driving mechanism, wherein the drill rod is of a cylinder structure with a through hole, an annular cavity is also arranged in the drill rod, namely, a closed cylinder structure comprising the annular cavity is arranged at the periphery of the through hole, the lower end of the drill rod is fixedly connected with the drill bit, the drill bit is arranged around the through hole,
the underground static detection driving mechanism passes through the through hole and is fixedly connected with the detection rod, one end of the detection rod is fixedly connected with the underground static detection driving mechanism, the other end of the detection rod is positioned outside the through hole and is provided with a probe which is used for penetrating the detection rod into a target geological layer, the underground static detection driving mechanism is used for driving the detection rod to advance or retreat so as to enable the probe on the detection rod to penetrate into the target geological layer,
an acoustic transmitter is arranged in the annular cavity of the drill rod,
the probe is provided with first sound wave receiver and second sound wave receiver on the one end that keeps away from the through-hole, and first sound wave receiver and second sound wave receiver interval setting and interval distance between the two keep fixed.
2. A downhole static probe device for sonic testing according to claim 1, wherein one end of the probe rod is positioned outside or inside the through hole and fixedly connected to the downhole static probe driving mechanism.
3. A downhole static probe device for sonic testing according to claim 2, wherein the through-hole is arranged along the axial extension of the drill rod.
4. A downhole static probe device for sonic testing according to claim 3, wherein the downhole static probe driving mechanism is arranged along the axial direction of the through hole.
5. The downhole static sounding device for sonic velocity testing of claim 4, wherein the sonic transmitter is fixedly or removably mounted in the annular cavity of the drill pipe.
6. The downhole static sounding device for sound velocity testing of claim 5, wherein the separation distance between the first sound wave receiver and the second sound wave receiver is kept fixed.
7. A downhole static probe device for sonic testing according to claim 6, wherein the two sonic receivers are fixed to the probe rod or the two sonic receivers are synchronously movable along the probe rod, and the separation distance between the two sonic receivers is kept constant all the time.
8. The downhole static probe device for sonic testing according to claim 7, wherein the drill bit is screwed to the drill rod.
9. A downhole static probe device for sonic testing according to claim 8, wherein the drill rod is provided in plurality and the sonic transmitter is mounted in an annular cavity of the drill rod closest to the probe rod.
10. A downhole static probe device for sonic testing according to claim 9, wherein the probe rod is a cylindrical rod, the drill rod is a cylindrical structure, and the axis of the static probe driving mechanism, the axis of the probe rod and the axis of the drill rod are coincident and on the same straight line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321705345.8U CN220151344U (en) | 2023-06-30 | 2023-06-30 | Underground static detection device for sound velocity test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321705345.8U CN220151344U (en) | 2023-06-30 | 2023-06-30 | Underground static detection device for sound velocity test |
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| Publication Number | Publication Date |
|---|---|
| CN220151344U true CN220151344U (en) | 2023-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321705345.8U Active CN220151344U (en) | 2023-06-30 | 2023-06-30 | Underground static detection device for sound velocity test |
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| CN (1) | CN220151344U (en) |
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2023
- 2023-06-30 CN CN202321705345.8U patent/CN220151344U/en active Active
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