CN114035223A - Device and method for measuring dynamic compaction seismic shear wave - Google Patents
Device and method for measuring dynamic compaction seismic shear wave Download PDFInfo
- Publication number
- CN114035223A CN114035223A CN202111230549.6A CN202111230549A CN114035223A CN 114035223 A CN114035223 A CN 114035223A CN 202111230549 A CN202111230549 A CN 202111230549A CN 114035223 A CN114035223 A CN 114035223A
- Authority
- CN
- China
- Prior art keywords
- steel plate
- rammer
- triangular steel
- tamping
- cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005056 compaction Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 133
- 239000010959 steel Substances 0.000 claims abstract description 133
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 38
- 239000004917 carbon fiber Substances 0.000 claims description 38
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 38
- 238000003466 welding Methods 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 16
- 239000002689 soil Substances 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
- G01V1/20—Arrangements of receiving elements, e.g. geophone pattern
-
- 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
Abstract
The invention provides a device and a method for measuring dynamic compaction seismic shear waves. The measuring device comprises an engineering seismometer, a wave detection mechanism and a trigger mechanism; the wave detection mechanism comprises at least three 3-C wave detectors which are connected in sequence through signal cables and are arranged at equal intervals; the trigger mechanism comprises a triangular steel plate suspended below the rammer and a steel anchor welded on the upper surface of the rammer, and the steel anchor and the triangular steel plate are respectively connected with a signal trigger interface of the engineering seismograph through cables. The rammer falls down from the ramming height, when the rammer is in contact with the triangular steel plate, the engineering seismograph receives signals, the detection mechanism starts to work, the actual measurement amplitude values of different distance measurement points are detected, a function formula of the actual measurement amplitude values and the distances is obtained, and then the dynamic compaction vibration influence energy levels at different distances are calculated in sequence according to the formula. The dynamic compaction device is simple in structure and convenient to use, and the influence range of dynamic compaction can be judged visually according to the magnitude of shear wave energy.
Description
Technical Field
The invention relates to the field of foundation engineering, foundation treatment construction methods and technologies, in particular to a device and a method for measuring dynamic compaction seismic shear waves.
Background
The dynamic compaction construction is mainly used for improving the bearing capacity of a foundation, is mainly used in the building industry, is widely applied to construction projects and sea filling projects, and is characterized in that high impact energy generated by the high fall of a heavy hammer body is utilized to strongly extrude materials with better performance, such as broken stones, rubbles, slag and the like into the foundation to form a series of aggregate pier composite foundations in the foundation so as to improve the bearing capacity of the foundation and reduce settlement. The construction generally adopts a crawler crane with an automatic unhooking device to lift the rammer.
In the dynamic compaction construction process, when the heavy pound rammer is unhooked and falls down in a free-falling body strength manner, strong impact force and shear wave can be generated on the ground, and influence is generated on nearby buildings within a certain range, and the buildings can be settled or even collapsed in the long-time ramming process, so that certain danger is generated. At present, the influence distance in the horizontal direction of dynamic compaction construction does not have a specified theoretical formula, most designs are judged only by experience, so that the construction safety is uncertain, partial sites are detected during construction, and huge economic loss is caused when the dynamic compaction construction is cancelled after potential safety hazards are found.
Disclosure of Invention
The invention aims to provide a device and a method for measuring seismic shear waves of dynamic compaction, aiming at solving the problem of the influence range of the dynamic compaction in the horizontal direction in the existing dynamic compaction construction process.
In order to achieve the technical purpose, the invention provides a dynamic compaction seismic shear wave measuring device, which is characterized in that: the device comprises an engineering seismograph, a detection mechanism and a trigger mechanism; the wave detection mechanism comprises a signal cable and at least three 3-C wave detectors which are equidistantly arranged on the ground at a fixed distance of 5-20 m from a seismic source, the tip end of each wave detector is inserted into the ground, and the signal cable sequentially connects the round end of each wave detector and then is connected with a signal input interface of the engineering seismometer; the triggering mechanism comprises a triangular steel plate positioned below the rammer and a steel anchor welded on the upper surface of the rammer, and the steel anchor is connected with a signal triggering interface of the engineering seismograph through a second cable; the triangular steel plate is connected with the rammer through a hose, after the triangular steel plate is connected with the rammer, an inclined included angle of 10-60 degrees exists between the plane where the triangular steel plate is located and the bottom surface of the rammer, and the triangular steel plate is connected with a signal triggering interface of the engineering seismograph through a third cable.
The invention has the following excellent technical scheme: the triangular steel plate is connected with the rammer through three carbon fiber hoses, three first steel rings are welded on the side face of the rammer, the three carbon fiber hoses are fixedly connected to three top corners of the triangular steel plate respectively, the other ends of the three carbon fiber hoses are connected to the three first steel rings respectively, one top corner of the triangular steel plate is lifted upwards after connection, so that an inclined included angle of 10-60 degrees exists between the triangular steel plate and a plane where the bottom face of the rammer is located, and a third cable is connected to one end, lifted up, of the triangular steel plate.
The invention has the following excellent technical scheme: and the carbon fiber hose is wrapped at the connecting part of the third cable and the triangular steel plate at least 10m away.
The invention has the following excellent technical scheme: the length of the third cable and the second cable is greater than the sum of the length of the engineering seismometer from the tamping pit and the tamping height of the rammer.
The invention has the following excellent technical scheme: the triangular steel plate is in an equilateral triangle shape, a second steel ring is welded at each vertex angle part of the triangular steel plate, one end of each of the three carbon fiber hoses is wound on the three second steel rings, and the other end of each of the three carbon fiber hoses is wound on the corresponding first steel ring; the three first steel rings are distributed on the side face of the rammer at intervals of 120 degrees, one of the three carbon fiber hoses is shorter than the other two carbon fiber hoses, after the three first steel rings are connected, one end, connected with the shorter carbon fiber hose, of the triangular steel plate is lifted upwards, and an inclined included angle of 10-30 degrees is formed between the triangular steel plate and the plane where the bottom face of the rammer is located.
In order to achieve the aim, the invention also provides a method for measuring dynamic compaction seismic shear waves, which is characterized by comprising the following specific steps of:
(1) at least three 3-C detectors are equidistantly arranged on the ground at a fixed distance of 5-20 m from a seismic source to form a combined detector, the tip of each 3-C detector is inserted into the ground, and is sequentially connected with the round end of each detector by using a signal cable and finally connected to a signal input interface of an engineering seismometer;
(2) welding a steel anchor on the surface of the top of the rammer, connecting three steel rings on the side surface of the rammer, winding and connecting a carbon fiber hose on each steel ring, respectively welding one steel ring on three corners of a triangular steel plate, respectively connecting the other ends of the three carbon fiber hoses connected to the side surface of the rammer to the vertex angle position of the triangular steel plate, wherein one end of the connected triangular steel plate is higher than the other two ends of the triangular steel plate, and forming an included angle of 10-60 degrees with the plane where the bottom surface of the rammer is located;
(3) the steel anchor and the higher end corner of the triangular steel plate are respectively connected with a signal trigger interface of an engineering seismometer through a second cable and a third cable, and the lengths of the second cable and the third cable are greater than the sum of the length of the engineering seismometer from a tamping pit and the tamping height of a tamping hammer;
(4) tamping the ram at a tamping energy level T0Dropping down at the tamping height in the step (3), tamping towards a tamping pit to finish the first tamping work, and enabling a tamping hammer to be in contact with a triangular steel plate in the tamping process to enable a trigger mechanism to be communicated;
(5) the engineering seismograph receives signals after the trigger mechanism is communicated, so that the detection mechanism starts to work, the 3-C detectors with different distances start to receive the model of the stratum shear wave, convert the model into electric signals, return to the engineering seismograph to obtain shear wave energy with different distances, namely the measured amplitude V of the measured points with different distancesn；
(6) Working according to the step (5)Actually measured amplitude V of different distances received by range seismographnDrawing a relation graph of the actually measured amplitudes of different distances and the arrangement distances of the corresponding 3-C detectors, and performing linear fitting to obtain a function formula of the actually measured amplitudes and the distances;
(7) and calculating the actually measured amplitude V at the center of the dynamic compaction point according to the formula fitted in the step (6)0Combined with the tamping energy level T at the center of the dynamic compaction tamping point0And measured amplitudes V of different distancesnCalculating the dynamic compaction vibration influence energy level T at different distances according to the following formulan:
(8) And (4) repeating the steps (4) to (7) in the same ramming pit, and sequentially carrying out second ramming to Nth ramming to finish the measurement work of each strong ramming seismic shear wave of the ramming energy.
The invention has the following excellent technical scheme: in the step (2), three steel rings are welded on the side surface of the rammer equally according to an included angle of 120 degrees, and carbon fiber hoses connected with the three steel rings are connected, wherein one of the carbon fiber hoses is shorter than the other two carbon fiber hoses; the triangular steel plate is an equilateral triangle, one end of the connected triangular steel plate is higher than the other two ends of the connected triangular steel plate, and an included angle of 10-30 degrees is formed between the connected triangular steel plate and the plane where the bottom surface of the rammer is located.
The invention has the following excellent technical scheme: and (4) wrapping the carbon fiber hose outside the third cable within at least 10m from the joint of the triangular steel plate in the step (3).
The invention has the following excellent technical scheme: the function formula of the measured amplitude V and the distance S obtained in the step (6) is as follows:
V＝aS+b
wherein: v is the measured amplitude; detection distance of S-3-C detector
a. b-fitting constant.
The detection mechanism can flexibly adjust the distance and the arrangement range of the detectors according to different ramming energy sizes and soil layers, and can also change the number of the detectors to adjust the measurement precision and increase the reliability of data. Trigger mechanism all adopts carbon fiber hose to connect or wrap up around rammer and rammer pit juncture, and the carbon fiber has high tensile strength and high flexibility, can prevent that the rammer from pressing the cable etc. to break or crushing when falling into the rammer pit, leads to unable triggering or contact failure, and carbon fiber has green's advantage, the policy requirement of corresponding green construction in comparison with other hoses simultaneously.
The trigger mechanism comprises a triangular steel plate and three carbon fiber hoses, wherein the triangular steel plate is connected with and suspended by the three carbon fiber hoses, and the length of the hose is adjusted according to the size of the rammer, so that the regular triangular steel plate is inclined at a certain included angle with the horizontal direction, on one hand, the steel plate can not be completely buried by soil and gravel in a rammer pit, and on the other hand, when the rammer is lifted up, soil on the upper surface of the steel plate can naturally slide down, so that the current can smoothly flow when the steel plate is contacted with the rammer pit; meanwhile, the steel plate is in quick single-point contact with the rammer, a single signal is quickly generated, and the steel plate is prevented from being in multi-point contact with the rammer, and the generated signals are mixed disorderly.
The dynamic compaction; compared with the existing method for measuring the seismic shear wave, the method has the advantages of low difficulty, short time, low cost and the like.
Drawings
FIG. 1 is a front view of a test apparatus according to the present invention;
FIG. 2 is a top view of the test device of the present invention;
FIG. 3 is a cross-sectional top view of a triangular steel plate of the present invention;
FIG. 4 is a graph of the first impact of the measured seismic shear wave versus distance at a certain energy level in the example;
FIG. 5 is a graph of measured seismic shear wave versus distance for six tamping events at a certain energy level in an example.
In the figure: the seismic detector comprises the following components, by weight, 1-an engineering seismograph, 2-a signal cable, 3-C geophones, 4-a hose, 5-a rammer, 6-a steel anchor, 7-a triangular steel plate, 8-a third cable, 9-a second cable, 10-a first steel ring, 11-a ramming pit and 12-a second steel ring.
Detailed Description
The invention is further illustrated by the following figures and examples. The drawings are for purposes of illustrating embodiments of the invention in a simplified manner and are not intended to be exhaustive or to limit the invention to the precise forms disclosed. The following claims presented in the drawings are specific to embodiments of the invention and are not intended to limit the scope of the claimed invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
The embodiment provides a dynamic compaction earthquake shear wave measuring device, which comprises an engineering seismometer 1, a wave detection mechanism and a trigger mechanism, as shown in figures 1 to 2; the wave detection mechanism comprises a signal cable 2 and more than five 3-C wave detectors 3 which are equidistantly arranged on the ground at a fixed distance of 5-20 m from a seismic source, the tip of each wave detector 3 is inserted into the ground by 50mm, and the signal cable 2 is used for connecting the round end of each wave detector 3 in sequence and then is connected with a signal input interface of the engineering seismometer 1; the triggering mechanism comprises a triangular steel plate 7 positioned below the rammer 5 and a steel anchor 6 welded on the upper surface of the rammer 5, the steel anchor 6 is welded in the middle of the radius of the rammer 5, and the steel anchor 6 is connected with a signal triggering interface of the engineering seismograph 1 through a second cable 9; the triangular steel plate 7 is connected with the rammer 5 through the hose 4, after the connection, an inclined included angle of 10-60 degrees exists between the triangular steel plate 7 and the plane where the bottom surface of the rammer 5 is located, the triangular steel plate 7 is connected with a signal triggering interface of the engineering seismograph 1 through a third cable 8, and the carbon fiber hose is wrapped at the connecting part of the third cable 8 and the triangular steel plate 7 at least 10m away. The length of the third cable 8 and the second cable 9 is larger than the sum of the length of the engineering seismograph 1 from the tamping pit 11 and the tamping height of the tamping hammer 5.
In the embodiment, the diameter of the rammer 5 is 2500mm, the triangular steel plate 7 is an equilateral triangular steel plate with the side length of 500mm and the thickness of 50mm, a second steel ring 12 is welded at each vertex angle part of the triangular steel plate 7, the triangular steel plate 7 is connected with the rammer 5 through three hoses 4, one of the three hoses 4 is shorter than the other two, the short hose is 2650mm long, and the long hose is 3000mm long; three first steel ring 10 of side welding at rammer 5, three first steel ring 10 interval 120 distribute in the side of rammer 5, wherein one end of three hoses 4 twines respectively at three second steel ring 12, the other end twines on corresponding first steel ring 10, and connect one of them apex angle of back triangle-shaped steel sheet 7 and upwards lift and make and have 10 slope contained angles between the plane at triangle-shaped steel sheet 7 and rammer 5 bottom surface place, the one end that triangle-shaped steel sheet 7 was raised is connected to third cable 8.
The method for measuring the dynamic compaction seismic shear wave is further explained in the following concrete construction process, wherein the compaction energy in the embodiment is 6000kN.m, and the concrete measurement steps are as follows:
(1) arranging five 3-C detectors at a fixed distance of 5-20 m at equal intervals on the ground from a seismic source to form a combined detector, inserting the tip of each 3-C detector into the ground by 50mm, connecting the tip of each detector with the round end of each detector in sequence by using a signal cable, and finally connecting the detector to a signal input interface of an engineering seismometer;
(2) welding a steel anchor on the top surface of the rammer, welding three first steel rings on the side surface of the rammer at intervals of 120 degrees at equal intervals, and winding and connecting a carbon fiber hose on each first steel ring; respectively welding a second steel ring at three corners of an equilateral triangle steel plate with the side length of 500mm and the thickness of 50mm, respectively connecting the other ends of three carbon fiber hoses connected to the side surface of the rammer to the vertex angle of the triangle steel plate 7, wherein one end of the connected triangle steel plate is higher than the other two ends, and an included angle of 10 degrees is formed between the connected triangle steel plate and the plane where the bottom surface of the rammer is located;
(3) connecting the steel anchor and the higher end corner of the triangular steel plate with a signal trigger interface of an engineering seismograph through a second cable and a third cable respectively, and wrapping a carbon fiber hose outside the third cable within a range of 10m from the connection part with the triangular steel plate; the length of the second cable and the third cable is greater than the sum of the length of the engineering seismometer from the tamping pit and the tamping height of the tamping hammer;
(4) dropping the rammer at a ramming level of 6000kN.m according to the ramming height in the step (3), ramming the rammer to a ramming pit to finish the first ramming work, and enabling the rammer to be in contact with the triangular steel plate in the ramming process so as to enable the trigger mechanism to be communicated;
(5) the engineering seismograph receives signals after the trigger mechanism is communicated, so that the detection mechanism starts to work, the 3-C detectors with different distances start to receive the model of the stratum shear wave, convert the model into electric signals, return to the engineering seismograph to obtain shear wave energy with different distances, namely the measured amplitude V of the measured points with different distancesnThe collected actual measurement amplitude data of five detectors under the first tamping condition under the tamping energy of 6000kN.m are shown in a table 1;
(6) according to the actually measured amplitude V of different distances received by the engineering seismograph in the step (5)nDrawing a relation graph of the actually measured amplitude values at different distances and the arrangement distances of the corresponding 3-C detectors, as shown in FIG. 4, and performing linear fitting on the relation graph to obtain a function formula of the actually measured amplitude values V and the distances S as follows:
V＝aS+b
wherein: v is the measured amplitude; detection distance of S-3-C detector
a. b-fitting constant;
after linear fitting in fig. 4, a-3520.4 and b-179151 are obtained, and the correlation coefficient R is obtained2＝0.9751；
(7) And according to the formula fitted in the step (6)Calculating the actual measurement amplitude V of the center of the dynamic compaction point, namely S is 00179151; and combining with the dynamic compaction construction energy level T at the position where the dynamic compaction point center S is equal to 006000kN. m, and measured amplitudes V at different distancesnCalculating the dynamic compaction vibration influence energy level T at different distances according to the following formulan:
Such as
According to the formula, the dynamic compaction vibration influence energy levels at different distances of the first dynamic compaction are calculated in sequence, and the detailed energy levels are shown in table 1:
table 1 shows the measured amplitudes of five detector instruments and the corresponding dynamic compaction vibration influence energy levels
| Number of |
0 | 1 | 2 | 3 | 4 | 5 |
| Distance (m) from detector to center of rammed |
0 | 10 | 20 | 30 | 40 | 50 |
| |
179151 | 149199 | 110193 | 66015 | 28025 | 14264 |
| Dynamic compaction vibration influence energy level Tn(kN.m) | 6000 | 4997 | 3691 | 2211 | 939 | 478 |
；
(8) Repeating the steps (4) to (7) in the same ramming pit, sequentially carrying out second ramming to sixth ramming to finish the measurement work of the dynamic compaction seismic shear wave of each time of the ramming energy, wherein the measured amplitude data of five detectors subjected to the six times of ramming are shown in a table 2, and the dynamic compaction vibration influence energy level data at different distances under the six times of ramming are shown in a table 3;
TABLE 2 measured amplitude data for five detectors with six tamping strokes
TABLE 3 data of dynamic compaction vibration influence energy levels at different distances under six times of compaction
On the other hand, a graph of the vibration speed of the seismic shear wave and the distance under six tamping strokes is drawn, and the graph is shown in detail in FIG. 5. As can be seen from fig. 5, the closer the vibration distance is, the greater the measured shear wave signal value is, the greater the distance is, the smaller the shear wave signal value is, and the more significant the attenuation of each signal according to the distance is, and the "safe allowable vibration speed for industrial and commercial buildings" according to the "safe allowable vibration speed for blasting vibration" in the blasting safety regulations (GB6722-2014) is 2.5cm/s to 5 cm/s. As can be seen from FIG. 4, the vibration velocity at 30m from the seismic source is 2.51cm/s to 3.27cm/s, within the allowable range of vibration safety; the vibration velocity of seismic waves is less than 2.5cm/s and the maximum vibration velocity is 1.57cm/s outside the range of 40m from the seismic source point, the vibration sense is slight, 6000kN.m energy level dynamic compaction has no influence on surrounding buildings basically, the influence condition on the surroundings in the dynamic compaction process can be judged directly through a measuring result, and after the measuring of the compaction point is completed, the compactor can be moved to the next compaction position to carry out the measuring work of the next compaction energy according to the same steps, so that the method is simple and convenient.
The measuring device in the invention can be used for measuring in advance in a dynamic compaction test or directly measuring in construction. The dynamic compaction test method can be used in the dynamic compaction test by firstly performing the dynamic compaction test aiming at a specific project without any experience and foundation in the early stage, and can directly measure the construction project with experience and foundation in the construction process.
In summary, the disclosure of the present invention is not limited to the above-mentioned embodiments, and persons skilled in the art can easily set forth other embodiments within the technical teaching of the present invention, but such embodiments are included in the scope of the present invention.
Claims (9)
1. The utility model provides a survey device of dynamic compaction earthquake shear wave which characterized in that: the device comprises an engineering seismograph (1), a detection mechanism and a trigger mechanism; the wave detection mechanism comprises a signal cable (2) and at least three 3-C wave detectors (3) which are equidistantly arranged on the ground at a fixed distance of 5-20 m from a seismic source, the tip end of each wave detector (3) is inserted into the ground, and the signal cable (2) is used for sequentially connecting the round end of each wave detector (3) and then is connected with a signal input interface of the engineering seismometer (1); the triggering mechanism comprises a triangular steel plate (7) positioned below the rammer (5) and a steel anchor (6) welded on the upper surface of the rammer (5), and the steel anchor (6) is connected with a signal triggering interface of the engineering seismograph (1) through a second cable (9); the triangular steel plate (7) is connected with the rammer (5) through the hose (4), after the connection, an inclined included angle of 10-60 degrees exists between the triangular steel plate (7) and a plane where the bottom surface of the rammer (5) is located, and the triangular steel plate (7) is connected with a signal triggering interface of the engineering seismograph (1) through the third cable (8).
2. The dynamic compaction seismic shear wave measurement apparatus of claim 1, wherein: triangular steel plate (7) are connected with rammer (5) through three carbon fiber hose (4), weld three first steel ring (10) in the side of rammer (5), three carbon fiber hose (4) are fixed connection respectively at the three apex angle of triangular steel plate (7), the other end is connected respectively on three first steel ring (10), and connect one of them apex angle of back triangular steel plate (7) and upwards lift up and make and have 10 ~ 60 slope contained angles between the plane at triangular steel plate (7) and rammer (5) bottom surface place, the one end of raising is connected at triangular steel plate (7) in third cable (8).
3. A dynamic compaction seismic shear wave measurement apparatus according to claim 1 or claim 2, wherein: and the carbon fiber hose is wrapped at the connecting part of the third cable (8) and the triangular steel plate (7) at least 10m away.
4. The dynamic compaction seismic shear wave measurement apparatus of claim 1, wherein: the length of the third cable (8) and the second cable (9) is larger than the sum of the length of the engineering seismograph (1) from the tamping pit (11) and the tamping height of the tamping hammer (5).
5. A dynamic compaction seismic shear wave measurement apparatus according to claim 2, wherein: the triangular steel plate (7) is in an equilateral triangle shape, a second steel ring (12) is welded at each vertex angle part of the triangular steel plate (7), one end of each of the three carbon fiber hoses (4) is wound on the three second steel rings (12), and the other end of each of the three carbon fiber hoses is wound on the corresponding first steel ring (10); the three first steel rings (10) are distributed on the side face of the rammer (5) at intervals of 120 degrees, one of the three carbon fiber hoses (4) is shorter than the other two carbon fiber hoses, after the three first steel rings (10) are connected, one end, connected with the shorter carbon fiber hose, of the triangular steel plate (7) is lifted upwards, and an inclined included angle of 10-30 degrees is formed between the triangular steel plate (7) and a plane where the bottom face of the rammer (5) is located.
6. A method for measuring dynamic compaction seismic shear waves is characterized by comprising the following specific steps:
(1) at least three 3-C detectors are equidistantly arranged on the ground at a fixed distance of 5-20 m from a seismic source to form a combined detector, the tip of each 3-C detector is inserted into the ground, and is sequentially connected with the round end of each detector by using a signal cable and finally connected to a signal input interface of an engineering seismometer;
(2) welding a steel anchor on the surface of the top of the rammer, connecting three steel rings on the side surface of the rammer, winding and connecting a carbon fiber hose on each steel ring, respectively welding one steel ring on three corners of a triangular steel plate, respectively connecting the other ends of the three carbon fiber hoses connected to the side surface of the rammer to the vertex angle position of the triangular steel plate, wherein one end of the connected triangular steel plate is higher than the other two ends of the triangular steel plate, and forming an included angle of 10-60 degrees with the plane where the bottom surface of the rammer is located;
(3) the steel anchor and the higher end corner of the triangular steel plate are respectively connected with a signal trigger interface of an engineering seismometer through a second cable and a third cable, and the lengths of the second cable and the third cable are greater than the sum of the length of the engineering seismometer from a tamping pit and the tamping height of a tamping hammer;
(4) tamping the ram at a tamping energy level T0Dropping down at the tamping height in the step (3), tamping towards the tamping pit to finish the first tamping work, and contacting the tamping hammer with the triangular steel plate in the tamping processSo that the trigger mechanism is communicated;
(5) the engineering seismograph receives signals after the trigger mechanism is communicated, so that the detection mechanism starts to work, the 3-C detectors with different distances start to receive the model of the stratum shear wave, convert the model into electric signals, return to the engineering seismograph to obtain shear wave energy with different distances, namely the measured amplitude V of the measured points with different distancesn；
(6) According to the actually measured amplitude V of different distances received by the engineering seismograph in the step (5)nDrawing a relation graph of the actually measured amplitudes of different distances and the arrangement distances of the corresponding 3-C detectors, and performing linear fitting to obtain a function formula of the actually measured amplitudes and the distances;
(7) and calculating the actually measured amplitude V at the center of the dynamic compaction point according to the formula fitted in the step (6)0Combined with the tamping energy level T at the center of the dynamic compaction tamping point0And measured amplitudes V of different distancesnCalculating the dynamic compaction vibration influence energy level T at different distances according to the following formulan:
(8) And (4) repeating the steps (4) to (7) in the same ramming pit, and sequentially carrying out second ramming to Nth ramming to finish the measurement work of each strong ramming seismic shear wave of the ramming energy.
7. The method of claim 6, wherein the method comprises the steps of: in the step (2), three steel rings are welded on the side surface of the rammer equally according to an included angle of 120 degrees, and carbon fiber hoses connected with the three steel rings are connected, wherein one of the carbon fiber hoses is shorter than the other two carbon fiber hoses; the triangular steel plate is an equilateral triangle, one end of the connected triangular steel plate is higher than the other two ends of the connected triangular steel plate, and an included angle of 10-30 degrees is formed between the connected triangular steel plate and the plane where the bottom surface of the rammer is located.
8. The method of claim 6, wherein the method comprises the steps of: and (4) wrapping the carbon fiber hose outside the third cable within at least 10m from the joint of the triangular steel plate in the step (3).
9. The method of claim 6, wherein the method comprises the steps of: the function formula of the measured amplitude V and the distance S obtained in the step (6) is as follows:
V＝aS+b
wherein: v is the measured amplitude; detection distance of S-3-C detector
a. b-fitting constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111230549.6A CN114035223B (en) | 2021-10-22 | 2021-10-22 | Dynamic compaction earthquake shear wave measuring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111230549.6A CN114035223B (en) | 2021-10-22 | 2021-10-22 | Dynamic compaction earthquake shear wave measuring device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114035223A true CN114035223A (en) | 2022-02-11 |
| CN114035223B CN114035223B (en) | 2023-06-02 |
Family
ID=80135115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111230549.6A Active CN114035223B (en) | 2021-10-22 | 2021-10-22 | Dynamic compaction earthquake shear wave measuring device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114035223B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4038631A (en) * | 1975-11-07 | 1977-07-26 | Murphy Vincent J | Method for generating and detecting seismic shear wave energy in the earth |
| CN101718579B (en) * | 2009-12-15 | 2011-05-11 | 柴剑勇 | Method and system for measuring shear wave velocity of rock soil |
| CN102943461B (en) * | 2012-12-06 | 2014-08-13 | 天津市市政工程设计研究院 | Quantitative analysis method for evaluating dynamic compaction reinforcement effect of foundation by utilizing Rayleigh surface waves |
| CN110130300B (en) * | 2019-05-17 | 2020-08-28 | 中冶集团武汉勘察研究院有限公司 | Method for determining characteristic value of bearing capacity of rammed/compacted fill layer by adopting shear wave velocity |
| CN111576384B (en) * | 2020-05-18 | 2021-11-16 | 中国化学工程重型机械化有限公司 | Construction method of high-energy-level dynamic compaction |
| CN112987093A (en) * | 2021-02-07 | 2021-06-18 | 陕西省水利电力勘测设计研究院勘察分院 | Single-hole shear wave testing method |
-
2021
- 2021-10-22 CN CN202111230549.6A patent/CN114035223B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114035223B (en) | 2023-06-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102261518B (en) | Restoration construction method for in-service oil gas pipeline which encounters with collapse and destruction of worked-out section | |
| CN111608663A (en) | Omnibearing pressure relief method for rock burst dangerous roadway of thick coal seam working face | |
| CN207314398U (en) | A kind of strong rammer region composite vibration insulation structure | |
| CN111636406B (en) | Intelligent monitoring system for dynamic compaction machine | |
| Liu et al. | Numerical simulation and engineering practice for optimal parameters of deep-hole blasting in sidewalls of roadway | |
| CN216118037U (en) | Device for measuring dynamic compaction earthquake shear wave in dynamic compaction process | |
| CN108132263A (en) | Across the hole radar detection device of diaphram wall internal flaw and method | |
| CN110008603A (en) | It explodes in a kind of tunnel portal structure the calculation method of tunnel internal impact wave superpressure reduction coefficient | |
| CN114035223A (en) | Device and method for measuring dynamic compaction seismic shear wave | |
| CN109610342A (en) | A kind of high-speed railway bridge major diameter prefabricated tubular pile long spire drawing hole construction method | |
| CN107460897A (en) | A kind of strong rammer region composite vibration insulation structure and its construction method | |
| CN107227805A (en) | The method of construction of underground vibration damping wall | |
| CN110671984A (en) | Boulder blasting construction method | |
| CN107401957B (en) | A kind of chimney, Demolition of Water Tower clump of piles vibration damping construction method | |
| JPH0617437A (en) | Pull-out test method of driven precast pile and pull-out tester thereto | |
| CN115310334A (en) | Method for evaluating impact resistance of roadway support | |
| CN115030236A (en) | Dynamic monitoring and control method for tunnel multi-step slope-pressing foot type slag abandoning field | |
| CN111256610B (en) | Device and method for measuring embedded depth of upright post of plug-in type edge-approaching guardrail | |
| CN105862938B (en) | Inclined steel-pipe pile self-balancing approach load box test structure and test method | |
| CN109537479B (en) | Blasting demolition method for stone-building double-arch bridge | |
| Shirzadegan et al. | Rock support subjected to dynamic loading: Field testing of ground support using simulated rockburst | |
| CN104264667A (en) | Construction method for pre-stress bamboo joint piles | |
| CN117146889A (en) | Originating well deformation monitoring device and method in large-diameter pipe jacking construction | |
| Wisotzki et al. | Strain and Acceleration Measurements at Instrumentation Distances to the Pile Head of 0.5 and 1.0 Times the Diameter—Offshore Pile-Monitoring Experience | |
| CN117387449A (en) | Explosion construction method for underpass existing pipeline of new tunnel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 430080 No. 17 metallurgical Avenue, Qingshan District, Hubei, Wuhan Patentee after: MCC Wukan Engineering Technology Co.,Ltd. Address before: 430080 No. 17 metallurgical Avenue, Qingshan District, Hubei, Wuhan Patentee before: WUHAN SURVEYING GEOTECHNICAL RESEARCH INSTITUTE Co.,Ltd. OF MCC |
|
| CP01 | Change in the name or title of a patent holder |