CN107356317B - Transverse wave attenuation measuring device and method - Google Patents
Transverse wave attenuation measuring device and method Download PDFInfo
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- CN107356317B CN107356317B CN201710717019.1A CN201710717019A CN107356317B CN 107356317 B CN107356317 B CN 107356317B CN 201710717019 A CN201710717019 A CN 201710717019A CN 107356317 B CN107356317 B CN 107356317B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
- G01H1/04—Measuring characteristics of vibrations in solids by using direct conduction to the detector of vibrations which are transverse to direction of propagation
- G01H1/08—Amplitude
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Abstract
The invention provides a transverse wave attenuation measuring device and method, and relates to the technical field of civil engineering. The device comprises a model groove, a concrete pile and a measuring unit, wherein the model groove is used for filling a soil body to be measured, one end of the concrete pile is arranged in the soil body to be measured, the measuring unit is connected with the soil body to be measured, and the inner side of a movable baffle is in contact with the soil body to be measured and has a preset distance with the concrete pile. The concrete pile vibrates under the action of external force after the distance between the concrete pile and the movable baffle plate is changed to generate transverse waves, and the measuring unit measures the vibration acceleration of the soil body to be measured to obtain a voltage signal; when the voltage signal measured by the measuring unit meets the preset condition, the transverse wave is shown to be absorbed by the soil body to be measured between the movable baffle plate and the concrete pile, and the attenuation range of the transverse wave in the soil body to be measured can be obtained according to the change distance of the movable baffle plate relative to the concrete pile and the preset distance. The transverse wave attenuation measuring device is simple in structure, convenient for a user to operate and capable of obtaining a measuring result quickly and accurately.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a transverse wave attenuation measuring device and method.
Background
The elastic wave can vibrate when being transmitted in the piles and the soil body, the vibration can have certain influence on surrounding buildings, fields, production life and the like, particularly has great influence on the production and operation of precision instruments, and the determination of the attenuation range of the elastic wave when being transmitted in the piles and the soil body has important significance on vibration reduction and isolation for the construction of cities, enterprises, universities and scientific research institutions in the region of earth-inch.
Therefore, how to determine the attenuation range of the elastic wave propagating in the pile and the soil has been a focus of attention of those skilled in the art.
Disclosure of Invention
The invention aims to provide a transverse wave attenuation measuring device for measuring the attenuation range of transverse waves in the soil body during propagation.
The invention also aims to provide a transverse wave attenuation measuring method to measure the attenuation range of the transverse wave when the transverse wave propagates in the soil body.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present invention provides a transverse wave attenuation measuring apparatus, configured to measure an attenuation range of a transverse wave in a soil mass to be measured. The transverse wave attenuation measuring device comprises a mold groove, a concrete pile and a measuring unit, wherein the mold groove is used for filling the soil body to be measured, one end of the concrete pile is arranged in the soil body to be measured, and the measuring unit is connected with the soil body to be measured; the model groove comprises a movable baffle plate, the inner side of the movable baffle plate is used for contacting with the soil body to be detected, and a preset distance is reserved between the movable baffle plate and the concrete pile; the movable baffle is used for moving according to a preset distance to change the distance between the concrete pile and the movable baffle, wherein the change of the distance between the concrete pile and the movable baffle is used for adjusting the volume of the model groove to increase the volume of the soil so that the height of the soil body to be measured is unchanged and the width of the soil body to be measured is increased; the concrete pile is used for generating transverse waves under the action of external force after the distance between the concrete pile and the movable baffle plate is changed, wherein the transverse waves are transmitted in the concrete pile and the soil body to be detected; the measuring unit is used for measuring the vibration acceleration of the soil body to be measured and obtaining a voltage signal according to the vibration acceleration; and when the voltage signal meets a preset condition, acquiring the change distance of the movable baffle relative to the concrete pile so as to obtain the attenuation range of the transverse wave in the soil body to be detected according to the change distance and the preset distance.
In a second aspect, an embodiment of the present invention further provides a transverse wave attenuation measuring method, which is applied to a transverse wave attenuation measuring apparatus, where the transverse wave attenuation measuring apparatus includes a mold groove, a concrete pile and a measuring unit, the mold groove is used to fill the soil to be measured, one end of the concrete pile is disposed in the soil to be measured, and the measuring unit is connected to the soil to be measured; the model groove comprises a movable baffle plate, the inner side of the movable baffle plate is used for contacting with the soil body to be detected, and a preset distance is reserved between the movable baffle plate and the concrete pile; the shear wave attenuation measurement method comprises the following steps: the movable baffle plate moves according to a preset distance to change the distance between the concrete pile and the movable baffle plate, wherein the change of the distance between the concrete pile and the movable baffle plate is used for adjusting the volume of the model groove to increase the soil mass so that the height of the soil mass to be measured is unchanged and the width of the soil mass to be measured is increased; after the distance between the concrete pile and the movable baffle plate is changed, the concrete pile vibrates under the action of external force to generate transverse waves, wherein the transverse waves are transmitted in the concrete pile and the soil body to be detected; the measuring unit measures the vibration acceleration of the soil body to be measured, and obtains a voltage signal according to the vibration acceleration; and when the voltage signal meets a preset condition, acquiring the change distance of the movable baffle relative to the concrete pile so as to obtain the attenuation range of the transverse wave in the soil body to be detected according to the change distance and the preset distance.
Compared with the prior art, the invention has the following beneficial effects:
the transverse wave attenuation measuring device provided by the invention comprises a mold groove, a concrete pile and a measuring unit, wherein the mold groove is used for filling the soil body to be measured, one end of the concrete pile is arranged in the soil body to be measured, and the measuring unit is connected with the soil body to be measured; the model groove comprises a movable baffle plate, the inner side of the movable baffle plate is used for contacting with the soil body to be detected, and a preset distance is reserved between the movable baffle plate and the concrete pile; the movable baffle is used for moving according to a preset distance to change the distance between the concrete pile and the movable baffle; the concrete pile is used for generating transverse waves under the action of external force after the distance between the concrete pile and the movable baffle is changed; the measuring unit is used for measuring the vibration acceleration of the soil body to be measured and obtaining a voltage signal according to the vibration acceleration; and when the voltage signal meets a preset condition, acquiring the change distance of the movable baffle relative to the concrete pile so as to obtain the attenuation range of the transverse wave in the soil body to be detected according to the change distance and the preset distance. The transverse wave attenuation measuring device and method increase the volume of the soil to be compacted to increase the width of the soil to be measured after the movable baffle is far away from the concrete pile by a preset distance, the amplitude of a voltage signal measured by a measuring unit changes along with the increase of the width of the soil to be measured, when the voltage signal meets a preset condition, the transverse wave is shown to be absorbed by the soil to be measured between the movable baffle and the concrete pile, and then the attenuation range of the transverse wave in the soil to be measured can be obtained according to the change distance of the movable baffle relative to the concrete pile and the initial preset distance of the movable baffle and the concrete pile. The transverse wave attenuation measuring device is simple in structure, convenient for a user to operate and capable of obtaining a measuring result quickly and accurately.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram illustrating a shear wave attenuation measuring apparatus according to a first embodiment of the present invention.
Fig. 2 is a schematic plan view of a shear wave attenuation measuring apparatus according to an embodiment of the present invention.
Fig. 3 shows a block diagram of a measurement unit provided in an embodiment of the present invention.
Fig. 4 shows a schematic structural diagram of a mold groove provided in an embodiment of the present invention.
Fig. 5 shows a cross-sectional view V-V in fig. 2.
Fig. 6 is a flow chart schematically illustrating a method for measuring attenuation of shear waves according to a second embodiment of the present invention.
Fig. 7 shows a specific flowchart of step S103 in fig. 6.
An icon: 100-shear wave attenuation measuring device; 110-a mold groove; 120-concrete pile; 130-a measurement unit; 140-soil body to be detected; 150-plastic film paper; 112-a movable baffle; 114-a backplane; 116-side panels; 131-an acceleration sensor; 132-a charge amplifier; 133-an oscilloscope; 1121-opening; 1122-hinge; 1123-cover plate; 1124-bolt.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
First embodiment
Fig. 1 is a schematic structural diagram of a transverse wave attenuation measuring apparatus 100 according to a first embodiment of the present invention. The transverse wave attenuation measuring device 100 comprises a model groove 110, a concrete pile 120 and a measuring unit 130, wherein the model groove 110 is used for filling the soil body 140 to be measured, one end of the concrete pile 120 is arranged in the soil body 140 to be measured, and the measuring unit 130 is connected with the soil body 140 to be measured; the mold groove 110 includes a movable barrier 112, an inner side of the movable barrier 112 is used for contacting the soil mass 140 to be measured, and the movable barrier 112 has a predetermined distance from the concrete pile 120.
Fig. 2 is a schematic plan view of the shear wave attenuation measuring apparatus 100. The shear wave attenuation measuring device 100 further comprises plastic film paper 150, the plastic film paper 150 is arranged on the inner side of the movable baffle 112 to contact with the soil mass 140 to be measured, and preferably, the measuring unit 130 is connected with the soil mass 140 to be measured through the plastic film paper 150. In this embodiment, the plastic film paper 150 is polyethylene pe plastic film paper, and the size thereof may be: length × width × thickness =1.0m × 0.8m × 0.04mm.
In this embodiment, before the transverse wave attenuation range is measured, the degree of compaction and the water content of the soil mass 140 to be measured are determined, then the soil mass 140 to be measured with a certain thickness (for example, 10 cm) and the degree of compaction is laid on the bottom of the model groove 110, the concrete pile 120 is placed in the model groove 110 and centrally arranged so that the initial distance between the movable baffle 112 and the concrete pile 120 is the preset distance (for example, 15 cm), the plastic film paper 150 is disposed and fixed on the inner side of the movable baffle 112, the soil mass 140 to be measured in the model groove 110 is compacted to a predetermined height (for example, 0.8 m) according to the determined degree of compaction, and the measuring unit 130 is connected with the plastic film paper 150. The impact hammer horizontally excites the concrete pile 120 to make the concrete pile 120 vibrate under the action of external force to generate transverse waves, the transverse waves are propagated in the concrete pile 120 and the soil mass 140 to be measured to further cause the soil mass 140 to be measured to vibrate, and at the moment, the measuring unit 130 can output corresponding voltage signals according to the vibration condition of the soil mass 140 to be measured.
In this embodiment, the movable barrier 112 is configured to move according to a predetermined distance to change the distance between the concrete pile 120 and the movable barrier 112, wherein the change of the distance between the concrete pile 120 and the movable barrier 112 is configured to adjust the volume of the mold groove 110 to increase the volume of the soil so that the height of the soil body 140 to be measured is not changed and the width of the soil body is increased. In this embodiment, each time the movable blocking plate 112 is moved by a predetermined distance (for example, 10 cm), after each movement of the movable blocking plate 112, the gap between the movable blocking plate 112 and the previous soil mass 140 to be measured has the predetermined distance, and it is necessary to increase the amount of soil in the gap and compact the soil mass with the predetermined compaction degree, so that the width of the soil mass 140 to be measured is increased, but the height is still kept unchanged (for example, always kept at 0.8 m). It should be noted that, after moving the movable baffle 112 each time, the side of the soil mass 140 to be measured, which was in contact with the movable baffle 112 before, needs to be scraped, so that when the increased soil mass is pressed, the contact between layers can be ensured to be sufficient, and the soil mass is prevented from layering.
In this embodiment, the concrete pile 120 is configured to vibrate by an external force to generate a transverse wave after the distance from the movable barrier 112 is changed.
The measuring unit 130 is configured to measure a vibration acceleration of the soil mass 140 to be measured, and obtain a voltage signal according to the vibration acceleration. As shown in fig. 3, it is a block diagram of the measurement unit 130. The measurement unit 130 includes an acceleration sensor 131, a charge amplifier 132 and an oscilloscope 133, the charge amplifier 132 is electrically connected to both the acceleration sensor 131 and the oscilloscope 133, and the acceleration sensor 131 is detachably mounted on the plastic film paper 150. Preferably, the acceleration sensor 131 is bonded to the plastic film paper 150. The acceleration sensor 131 is configured to measure the vibration acceleration of the soil mass 140 to be measured and output a charge signal to the charge amplifier 132 according to the vibration acceleration; the charge amplifier 132 is configured to amplify the charge signal and output the voltage signal to the oscilloscope 133; the oscilloscope 133 is configured to display the voltage signal. Preferably, the acceleration sensor 131 is of piezoelectric typeThe acceleration sensor has frequency range of 0.5-10 kHz and reference sensitivity of 1.88pC/m.s -2 . The wide frequency range of the charge amplifier 132 is 0.3Hz to 500Hz, and the low noise is less than 5 μ V. The bandwidth of the oscilloscope 133 is larger than or equal to 440MHz, and the sampling speed is 5Gs/s.
In this embodiment, since the acceleration sensor 131 is used to measure the vibration acceleration of the soil mass 140 to be measured, in order to fix the acceleration sensor 131 and make the acceleration sensor contact with the soil mass 140 to be measured, a layer of plastic film paper 150 is disposed between the inner side of the movable baffle 112 and the soil mass 140 to be measured, so that the acceleration sensor 131 is adhered to the plastic film paper 150 and makes the contact with the soil mass 140 to be measured, thereby facilitating the measurement of the vibration acceleration of the soil mass 140 to be measured.
When the voltage signal meets a preset condition, the change distance of the movable baffle 112 relative to the concrete pile 120 is obtained, so that the attenuation range of the transverse wave in the soil mass 140 to be measured can be obtained according to the change distance and the preset distance.
In this embodiment, after the movable barrier 112 is moved and the width of the soil mass 140 to be measured is increased, the concrete pile 120 is horizontally excited by the impact force hammer to vibrate the concrete pile 120 under the action of an external force to generate a transverse wave, and the measuring unit 130 measures the vibration acceleration in the soil mass 140 to be measured and obtains a voltage signal according to the vibration acceleration. Repeating the above process, as the width of the soil mass 140 to be measured increases, the amplitude of the voltage signal decreases gradually, and when the amplitude of the voltage signal decreases to meet a preset condition (for example, the amplitude is close to 0), it indicates that the soil mass 140 to be measured between the movable baffle 112 and the concrete pile 120 completely absorbs the transverse wave, and the attenuation range of the transverse wave in the soil mass 140 to be measured can be obtained according to the change distance of the movable baffle 112 relative to the concrete pile 120 and the initial preset distance between the movable baffle 112 and the concrete pile 120. For example, the preset distance between the movable baffle 112 and the concrete pile 120 is 15cm, the amplitude of the voltage signal measured by the measuring unit 130 gradually decreases as the movable baffle 112 moves by 10cm, when the amplitude of the voltage signal is close to 0, the changed distance (i.e., the moved distance) of the movable baffle 112 relative to the concrete pile 120 is 30cm, and then the distance between the movable baffle 112 and the concrete pile 120 is 45cm, so that the attenuation range of the transverse wave in the soil mass 140 to be measured is 15cm to 45cm.
As shown in fig. 4, a schematic structural view of the mold groove 110 is shown. The model groove 110 further includes a bottom plate 114 and side plates 116, wherein there are 3 side plates 116, a cavity is enclosed by the bottom plate 114, the 3 side plates 116 and the movable baffle 112, and the soil mass 140 to be measured is filled in the cavity. An opening 1121 and a cover plate 1123 are arranged on the movable baffle 112, the cover plate 1123 is hinged to the movable baffle 112, and the size of the opening 1121 and the size of the cover plate 1123 are matched, and are 0.15m × 0.15m, so that the cover plate 1123 can cover the opening 1121. Preferably, the cover plate 1123 is hinged to the movable flap 112 using a hinge 1122, and the opening 1121 is aligned with a side of the concrete pile 120 adjacent to the movable flap 112. The cover plate 1123 is further provided with a bolt 1124, and the bolt 1124 can be used to control the cover plate 1123 to open or close the opening 1121. In the present embodiment, there are 2 openings 1121, and an acceleration sensor 131 is disposed at a position corresponding to the plastic film paper 150 in each opening 1121, and the acceleration sensor 131 is adhered to the plastic film paper 150 through the opening 1121, as shown in fig. 5, which is a cross-sectional view of V-V in fig. 2. In this embodiment, for comparison and observation, an acceleration sensor 131 may be further disposed on the concrete pile 120 near the movable baffle 112 and 10cm away from the pile top, so as to observe the transverse wave signal propagating on the concrete pile 120 after the concrete pile 120 is horizontally excited by the impact hammer.
In this embodiment, the cross-sectional dimension of the concrete pile 120 may be 0.15m × 0.15m, the pile length is 1.5m, and the dimension of the mold groove 110 may be: length × width × height =1.0m × 1.0m × 0.8m, the movable shutter 112 may have a size of: width × height =1.0m × 0.8m. It should be understood that the sizes of the structures of the middle mold groove 110, the concrete piles 120, the movable baffles 112, the plastic film paper 150, the openings 1121, and the cover plate 1123 are only one embodiment and are not limited thereto. Meanwhile, the number of the openings 1121 and the acceleration sensors 131 is not limited at all.
Second embodiment
Referring to fig. 6, a flow chart of a shear wave attenuation measuring method according to a second embodiment of the present invention is shown, and the shear wave attenuation measuring method can be applied to the shear wave attenuation measuring apparatus 100 according to the first embodiment. It should be noted that the method for measuring attenuation of shear wave according to the embodiment of the present invention is not limited by fig. 6 and the following specific sequence, the basic principle and the generated technical effect are the same as those of the first embodiment, and for the sake of brief description, the corresponding contents in the first embodiment can be referred to for the parts not mentioned in the embodiment. It should be understood that, in other embodiments, the order of some steps in the method for measuring the attenuation of shear waves according to the present invention may be interchanged according to actual needs, or some steps may be omitted or deleted. The specific flow shown in fig. 6 will be described in detail below.
Step S101, the movable baffle 112 moves according to a predetermined distance to change the distance between the concrete pile 120 and the movable baffle 112, wherein the change of the distance between the concrete pile 120 and the movable baffle 112 is used to adjust the volume of the mold groove 110 to increase the volume of the soil so that the height of the soil body 140 to be measured is not changed and the width is increased.
In this embodiment, the movable baffle 112 has a predetermined distance from the concrete pile 120 before the distance between the concrete pile 120 and the movable baffle 112 is changed. Preferably, the concrete pile 120 may be horizontally excited by an impact hammer when the distance between the movable baffle 112 and the concrete pile 120 is the preset distance, and then the received voltage signal may be observed by the oscilloscope 133. The acceleration sensor 131 is removed, the opening 1121 is closed by the cover plate 1123, the plug 1124 is inserted, the movable shutter 112 is moved by a predetermined distance, the amount of soil is added to the gap and compacted, then the plug 1124 is opened, the cover plate 1123 is pulled open, and the acceleration sensor 131 is adhered to the plastic film paper 150 through the opening 1121.
Step S102, after the distance between the concrete pile 120 and the movable baffle 112 is changed, the concrete pile is vibrated by an external force to generate a transverse wave, wherein the transverse wave propagates through the concrete pile 120 and the soil mass 140 to be measured.
Step S103, the measuring unit 130 measures the vibration acceleration of the soil mass 140 to be measured, and obtains a voltage signal according to the vibration acceleration.
As shown in fig. 7, in this embodiment, the step S103 may specifically include the following sub-steps:
in the sub-step S1031, the acceleration sensor 131 measures the vibration acceleration of the soil mass 140 to be measured and outputs a charge signal to the charge amplifier 132 according to the vibration acceleration.
In the substep S1032, the charge amplifier 132 amplifies the charge signal to obtain the voltage signal, and outputs the voltage signal to the oscilloscope 133.
In sub-step S1033, the oscilloscope 133 displays the voltage signal.
And step S104, judging whether the voltage signal meets a preset condition.
In this embodiment, the determination is performed according to the magnitude of the voltage signal displayed by the oscilloscope 133, and if a preset condition is satisfied (for example, the magnitude of the voltage signal is close to 0), step S105 is executed; if the preset condition is not met, step S101 is executed to continuously change the width of the soil mass 140 to be measured between the concrete pile 120 and the movable baffle 112, so that the amplitude of the voltage signal displayed in the oscilloscope 133 is gradually reduced until the preset condition is met.
Step S105, when the voltage signal meets a preset condition, obtaining a change distance of the movable baffle 112 relative to the concrete pile 120, so as to obtain an attenuation range of the cross wave in the soil mass 140 to be measured according to the change distance and the preset distance.
In summary, the transverse wave attenuation measuring device and method provided by the embodiments of the present invention include a mold groove, a concrete pile, a plastic film paper, and a measuring unit, where the mold groove is used to fill the soil to be measured, one end of the concrete pile is disposed in the soil to be measured, the mold groove includes a movable baffle, the movable baffle has a preset distance from the concrete pile, the plastic film paper is disposed on an inner side of the movable baffle to contact the soil to be measured, the measuring unit includes an acceleration sensor, a charge amplifier, and an oscilloscope, the charge amplifier is electrically connected to the acceleration sensor and the oscilloscope, and the acceleration sensor is bonded to the plastic film paper. The movable baffle plate is used for moving according to a preset distance to change the distance between the concrete pile and the movable baffle plate, wherein the change of the distance between the concrete pile and the movable baffle plate is used for adjusting the volume of the mould groove to increase the volume of soil so that the height of the soil body to be measured is unchanged, and the width of the soil body to be measured is increased; the concrete pile is used for generating transverse waves under the action of external force after the distance between the concrete pile and the movable baffle plate is changed, wherein the transverse waves are transmitted in the concrete pile and the soil body to be detected. The acceleration sensor is used for measuring the vibration acceleration of the soil body to be measured and outputting a charge signal to the charge amplifier according to the vibration acceleration; the charge amplifier is used for amplifying the charge signal to obtain the voltage signal and outputting the voltage signal to the oscilloscope; the oscilloscope is used for displaying the voltage signal. And when the voltage signal meets a preset condition, acquiring the change distance of the movable baffle relative to the concrete pile so as to obtain the attenuation range of the transverse wave in the soil body to be detected according to the change distance and the preset distance. The transverse wave attenuation measuring device is simple in structure, convenient for a user to operate and capable of obtaining a measuring result quickly and accurately.
It is noted that, in this document, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Claims (8)
1. A transverse wave attenuation measuring device is used for measuring the attenuation range of transverse waves in a soil body to be measured and is characterized by comprising a mold groove, a concrete pile and a measuring unit, wherein the mold groove is used for filling the soil body to be measured, one end of the concrete pile is arranged in the soil body to be measured, and the measuring unit is connected with the soil body to be measured; the model groove comprises a movable baffle plate, the inner side of the movable baffle plate is used for contacting with the soil body to be detected, and a preset distance is reserved between the movable baffle plate and the concrete pile;
the movable baffle is used for moving according to a preset distance to change the distance between the concrete pile and the movable baffle, wherein the change of the distance between the concrete pile and the movable baffle is used for adjusting the volume of the model groove to increase the volume of the soil so that the height of the soil body to be measured is unchanged and the width of the soil body to be measured is increased; the concrete pile is used for generating transverse waves under the action of external force after the distance between the concrete pile and the movable baffle plate is changed, wherein the transverse waves are transmitted in the concrete pile and the soil body to be detected; the measuring unit is used for measuring the vibration acceleration of the soil body to be measured and obtaining a voltage signal according to the vibration acceleration; when the voltage signal meets a preset condition, acquiring the change distance of the movable baffle relative to the concrete pile so as to obtain the attenuation range of the transverse wave in the soil body to be detected according to the change distance and the preset distance;
the transverse wave attenuation measuring device also comprises plastic film paper, the plastic film paper is arranged on the inner side of the movable baffle plate to be in contact with the soil body to be measured, and the measuring unit is connected with the soil body to be measured through the plastic film paper;
the mold groove further comprises a bottom plate and a side plate, the bottom plate, the side plate and the movable baffle plate enclose a cavity, and soil to be detected is filled in the cavity.
2. The shear wave attenuation measuring device according to claim 1, wherein said measuring unit comprises an acceleration sensor, a charge amplifier and an oscilloscope, said charge amplifier is electrically connected to both said acceleration sensor and said oscilloscope, said acceleration sensor is detachably mounted on said plastic film paper;
the acceleration sensor is used for measuring the vibration acceleration of the soil body to be measured and outputting a charge signal to the charge amplifier according to the vibration acceleration; the charge amplifier is used for amplifying the charge signal to obtain the voltage signal and outputting the voltage signal to the oscilloscope; the oscilloscope is used for displaying the voltage signal.
3. The shear wave attenuation measuring device of claim 2, wherein said movable barrier has an opening therein, said opening being aligned with a side of said concrete pile adjacent said movable barrier, said acceleration sensor being mounted on said plastic film paper through said opening.
4. The shear wave attenuation measuring device of claim 3, wherein a cover plate is further provided on said movable barrier, said cover plate being hinged to said movable barrier to cover said opening.
5. The shear wave attenuation measurement device of claim 2, wherein said acceleration sensor is bonded to said plastic film paper.
6. The shear wave attenuation measurement device of claim 2, wherein the acceleration sensor is a piezoelectric acceleration sensor.
7. A transverse wave attenuation measuring method is applied to a transverse wave attenuation measuring device and is characterized in that the transverse wave attenuation measuring device comprises a model groove, a concrete pile and a measuring unit, the model groove is used for filling a soil body to be measured, one end of the concrete pile is arranged in the soil body to be measured, and the measuring unit is connected with the soil body to be measured; the model groove comprises a movable baffle plate, the inner side of the movable baffle plate is used for contacting with the soil body to be detected, and a preset distance is reserved between the movable baffle plate and the concrete pile;
the shear wave attenuation measurement method comprises the following steps:
the movable baffle plate moves according to a preset distance to change the distance between the concrete pile and the movable baffle plate, wherein the change of the distance between the concrete pile and the movable baffle plate is used for adjusting the volume of the mould groove to increase the volume of the soil body, so that the height of the soil body to be measured is unchanged, and the width of the soil body to be measured is increased;
after the distance between the concrete pile and the movable baffle is changed, the concrete pile vibrates under the action of external force to generate transverse waves, wherein the transverse waves are transmitted in the concrete pile and the soil body to be detected; the measuring unit measures the vibration acceleration of the soil body to be measured and obtains a voltage signal according to the vibration acceleration;
and when the voltage signal meets a preset condition, acquiring the change distance of the movable baffle relative to the concrete pile so as to obtain the attenuation range of the transverse wave in the soil body to be detected according to the change distance and the preset distance.
8. The method according to claim 7, wherein the measuring unit comprises an acceleration sensor, a charge amplifier and an oscilloscope, and the charge amplifier is electrically connected with the acceleration sensor and the oscilloscope;
the measuring unit measures the vibration acceleration of the soil body to be measured, and the step of obtaining a voltage signal according to the vibration acceleration comprises the following steps:
the acceleration sensor measures the vibration acceleration of the soil body to be detected and outputs a charge signal to the charge amplifier according to the vibration acceleration;
the charge amplifier amplifies the charge signal to obtain a voltage signal and outputs the voltage signal to the oscilloscope;
and the oscilloscope displays the voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710717019.1A CN107356317B (en) | 2017-08-21 | 2017-08-21 | Transverse wave attenuation measuring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710717019.1A CN107356317B (en) | 2017-08-21 | 2017-08-21 | Transverse wave attenuation measuring device and method |
Publications (2)
| Publication Number | Publication Date |
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| CN107356317A CN107356317A (en) | 2017-11-17 |
| CN107356317B true CN107356317B (en) | 2023-04-07 |
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