CN113376686B - Microseism sensor device based on expanded material - Google Patents
Microseism sensor device based on expanded material Download PDFInfo
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- 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
- G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
Abstract
A microseismic sensor device based on an expansion material belongs to the technical field of geotechnical engineering. The scheme is as follows: installation pole one end is connected with the handle, the other end is connected with sensor one end, the sensor other end is connected with the elasticity storehouse, the probe is connected with the elasticity storehouse, the sensor periphery is by interior toward setting gradually the inner shell outward, visit the layer, the inflation layer, the shell, the elasticity layer, set up the dynamometer on the installation pole, the dynamometer passes through the wire respectively with visit the layer, the elasticity storehouse is connected, set up a plurality of springs in the inflation layer, the inner shell is connected to spring one end, the shell is connected to the other end, but shell and spout sliding connection, the kelly is connected with the installation pole. Has the advantages that: the strength and the expansion rate of the modified expansive soil are increased, the strength is increased, disturbance can be resisted, and the expansion rate is increased, so that the sensor is more firmly installed; the sensor is simple to install and convenient to recover, and does not need to use reinforced cement; the sensor is more sensitive.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering, and particularly relates to a microseismic sensor device based on an expansion material.
Background
The rock burst is the phenomenon that the rock body is damaged and elastic strain energy is rapidly and violently released, so that sudden damage occurs in the rock body adjacent to the hollow space, and the rock burst seriously threatens the safety of underground engineering. In recent years, with the increase of the construction depth and strength of geotechnical engineering, the frequency of rock burst generation is higher and higher. The traditional deep rock mass stability research method comprises field measurement, a statistical method, numerical simulation and the like, and the damage of the deep rock mass is generally evaluated by factors such as rock lithology, geological structure, ground pressure, surrounding rock stress concentration and the like. However, these studies do not determine the spatiotemporal trends of initiation, propagation and breakthrough of deep rock microfractures. Micro-fracturing of rock is a precursor feature of macroscopic deformation and even destruction of rock. Therefore, microseismic monitoring techniques are needed to study the evolution of deep rock microfractures, revealing the intrinsic mechanism of their destruction.
The noise of a construction site is more, and an acceleration sensor for monitoring the micro-earthquake needs to be installed in a drill hole of a rock body nearby the construction. Usually, a hole is drilled at the bottom of a small paper cup, the paper cup is fixed at the tail part of a sensor by screws and a metal gasket, then the small paper cup is filled with a cement anchoring agent or a resin anchoring agent which is uniformly stirred, then the sensor is sent into the hole bottom by an installation rod, the anchoring agent in the paper cup is forcibly extruded out, the sensor is bonded at the hole bottom after the anchoring agent is solidified, and the installation rod is taken out. The sensor needs to be removed in two cases: 1 when the sensor has a monitoring problem, the sensor needs to be taken out of the hole for maintenance. 2, the sensor is pushed along with the tunnel face, and when the distance between the sensor and the tunnel face is larger than the monitoring range of the sensor, the sensor needs to be continuously moved forwards. The sensor can only be screwed out by using the mounting rod, but the sensor is fixed in the hole by using the cement anchoring agent or the resin anchoring agent and is difficult to take out, so that each sensor is expensive, once the sensor cannot be taken out, the microseismic monitoring cost is greatly increased, the time and the fund are wasted, the monitoring quality is influenced, and the construction of workers is delayed.
In recent years, some devices and methods for installing microseismic sensors have appeared, such as fixing the sensor with cement after fixing the sensor by using an air bag or an expanding agent, or fixing with cement after adding a sleeve outside the sensor, but these methods have not been popularized in engineering, and have some problems: 1 the sensor is influenced to contact with the rock mass when the sensor is fixed by the air bag, and the monitoring effect is further influenced. 2 the common sensor only has the top part capable of receiving signals, has poor sensitivity and is easy to be influenced by direction. 3, the anchoring agent is still used for reinforcement, so that a large amount of consumables are wasted. 4, the construction process is too complex, and the operation is not easy for constructors. And 5, when the sensor has a problem, the maintenance is very difficult, and only a new sensor can be installed again sometimes. 6 when the rock mass of sensor installation department takes place to warp, the monitoring is influenced in the anchor inefficacy. 7 the coupling of the sensor and the anchoring agent in the hole is difficult to control, and the monitoring signal quality is influenced when the contact is poor. 8, the construction disturbance enables the sensor to continuously vibrate nearby, so that the sensor is easily separated from the anchoring agent or the anchoring agent is easily separated from the rock mass, and the monitoring signal quality is influenced. And 9, when the expansion agent is used for fixing, the general expansion agent influences the quality of the monitoring signal, the expansion capacity is weak, the fixing effect is poor, and the expansion effect is easy to lose when the expansion agent is disturbed by construction.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a microseismic sensor device based on an expansion material, which uses improved expansive soil to replace the traditional expanding agent, thereby ensuring the quality of monitoring signals; the expansion capacity and strength of the improved expansive soil are improved, and the improved expansive soil is not influenced by construction disturbance; besides the top probe, a probe layer is added around the sensor, so that not only the top can receive signals, but also the periphery can receive signals, the sensitivity of the sensor is improved, and the influence of directivity is eliminated.
The technical scheme is as follows:
an intumescent material based microseismic sensor device comprising: installation pole, handle, dynamometer, wire, sensor, probe, elasticity storehouse, inner shell, inflation layer, elasticity layer, visit layer, spring, spout, kelly, installation pole one end with the handle is connected, the other end with sensor one end is connected, the sensor other end with the elasticity storehouse is connected, the probe with the elasticity storehouse is connected, the sensor periphery is by interior toward setting gradually the inner shell outward, visiting layer, inflation layer, shell, elasticity layer, set up on the installation pole the dynamometer, the dynamometer passes through the wire respectively with visit layer, elasticity storehouse and connect, set up a plurality ofly in the inflation layer the spring, spring one end is connected the inner shell, the other end are connected the shell, the shell with spout sliding connection, the kelly with the installation pole is connected.
Further, the swelling layer is filled with swelling soil, and the following mineral components and proportions are obtained by the swelling soil through x-ray diffraction: wherein the quartz accounts for 67.13 percent, the calcite accounts for 30.27 percent and the montmorillonite accounts for 2.6 percent.
Further, still include and be used for the extension the telescopic joint of installation pole, the telescopic joint is installed on the installation pole.
Further, still include inlet tube, water delivery pump, outlet pipe, suction pump, inlet tube, outlet pipe all are connected to the inflation layer, the water delivery pump is installed on the inlet tube, the outlet pipe is installed on the outlet pipe.
Furthermore, the device also comprises a cable, wherein one end of the cable is connected with the sensor, and the other end of the cable is connected with the data acquisition center.
The invention has the beneficial effects that:
the microseismic sensor device based on the expansion material has the following beneficial effects:
1. the improved expansive soil is used for replacing the traditional expanding agent, so that the quality of monitoring signals is guaranteed;
2. the expansion capacity and strength of the improved expansive soil are improved, and the improved expansive soil is not influenced by construction disturbance;
3. besides the top probe, the probe layer is added around the sensor, so that not only the top can receive signals, but also the periphery can receive signals, the sensitivity of the sensor is improved, and the influence of directivity is eliminated;
4. an anchoring agent is not needed, consumables are not wasted, and cost is saved;
5. the construction process is very simple, and the operation is easy for constructors;
6. when the sensor has a problem, the maintenance is very simple, and a new sensor does not need to be installed again;
7. when the rock mass at the installation position of the sensor deforms, the expansion system of the device can be automatically adjusted, so that continuous monitoring is ensured, and the phenomenon of poor contact is avoided;
8. the force measuring system can observe the contact condition of the sensor and the hole wall, and the sensor is ensured to be in full contact with the hole wall.
Drawings
FIG. 1 is a general structural view of a microseismic sensor assembly of the present invention;
FIG. 2 is a partial top view of the microseismic sensor device of the present invention;
FIG. 3 is a graph showing the no-load expansion ratio of the improved soil at a dry density of 1.5g/cm 3;
FIG. 4 is a graph showing the no-load expansion ratio of the improved soil at a dry density of 1.6g/cm 3;
FIG. 5 is a graph showing the no-load expansion ratio of the improved soil at a dry density of 1.7g/cm 3;
FIG. 6 is a schematic diagram of the maximum no-load expansion rate of the improved soil;
FIG. 7 is a graphical representation of axial stress versus axial strain at a dry density of 1.5g/cm 3;
FIG. 8 is a graphical representation of axial stress versus axial strain at a dry density of 1.6g/cm 3;
FIG. 9 is a graphical representation of axial stress versus axial strain at a dry density of 1.7g/cm 3;
FIG. 10 is a schematic view of compressive strength of improved soil;
the reference numbers in the figures are as follows: wherein: 1. the water pump comprises a mounting rod, a handle, a telescopic joint, a force measuring meter, a lead, a sensor, a probe, a spring bin, an inner shell, an outer shell, an expansion layer, an elastic layer, a detection layer, a spring, a sliding groove, a clamping rod, a water inlet pipe, a water delivery pump, a water outlet pipe, a water suction pump, a cable and a hole wall, wherein the mounting rod is 2, the handle is 3, the telescopic joint is 4, the force measuring meter is 5, the lead is 6, the sensor is 7, the probe is 8, the inner shell is 9, the outer shell is 10, the expansion layer is 11, the elastic layer is 12, the detection layer is 13, the spring is 14, the sliding groove is 15, the clamping rod is 16, the water inlet pipe is 17, the water delivery pump is 18, the water outlet pipe is 19, the water suction pump is 20, the cable is 21, and the hole wall is 22.
Detailed Description
This is further illustrated below with reference to fig. 1-10.
Example 1
An intumescent material based microseismic sensor device comprising: the installation rod 1, the handle 2, the dynamometer 4, the lead 5, the sensor 6, the probe 7, the elastic bin 8, the inner shell 9, the outer shell 10, the expansion layer 11, the elastic layer 12, the detection layer 13, the spring 14, the sliding chute 15 and the clamping rod 16, one end of the installation rod 1 is connected with the handle 2, the other end is connected with one end of the sensor 6, the other end of the sensor 6 is connected with the elastic bin 8, the probe 7 is connected with the elastic bin 8, the periphery of the sensor 6 is sequentially provided with the inner shell 9, the detection layer 13, the expansion layer 11, the outer shell 10 and the elastic layer 12 from inside to outside, the dynamometer 4 is arranged on the installation rod 1, the dynamometer 4 is respectively connected with the detection layer 13 and the elastic bin 8 through the lead 5, the plurality of springs 14 are arranged in the expansion layer 11, one end of each spring 14 is connected with the inner shell 9 and the other end of each spring is connected with the outer shell 10, the housing 10 is slidably connected to the sliding groove 15, and the locking rod 16 is connected to the mounting rod 1.
Further, the swelling layer 11 is filled with swelling soil, and the following mineral components and proportions are obtained by x-ray diffraction of the swelling soil: wherein the quartz accounts for 67.13 percent, the calcite accounts for 30.27 percent and the montmorillonite accounts for 2.6 percent.
Further, still include and be used for the extension telescopic joint 3 of installation pole 1, telescopic joint 3 is installed on installation pole 1.
Further, still include inlet tube 17, water delivery pump 18, outlet pipe 19, suction pump 20, inlet tube 17, outlet pipe 19 all are connected to inflation layer 11, water delivery pump 18 is installed on inlet tube 17, outlet pipe 19 is installed on outlet pipe 19.
Further, the device also comprises a cable 21, wherein one end of the cable 21 is connected with the sensor 6, and the other end of the cable 21 is connected with a data acquisition center.
With reference to figure 1 of the drawings,
the mounting rod 1 comprises a handle 2, an expansion joint 3, a dynamometer 4 and a clamping rod 16, and a lead 5 is arranged in the mounting rod and used for placing/taking the device into/out of the hole.
The handle 2 facilitates picking up the device.
The telescopic joint 3 can be telescopic and prolonged, and the position of the device in the hole is adjusted.
The dynamometer 4 measures the pressure of the elastic bin 8 and the elastic layer 12 and judges the contact condition of the device and the hole wall 22.
The lead 5 transmits the pressure of the elastic bin 8 and the elastic layer 12 to the dynamometer 4.
The sensor 6 is connected with the mounting rod 1, collects signals received by the probe 7 and the probe layer 13 and transmits the signals to a data acquisition center through a cable 21.
The probe 7 is mounted on the sensor 6 and primarily receives signals from the front side of the borehole wall.
The elastic bin 8 is arranged on the probe 7, and can automatically adjust the position of the probe 7; the elastic bin 8 is elastic and can stretch. Since there may be a gap after normal vibration, which affects the received signal, the elastic bin 8 can be automatically adjusted at this time.
From the sensor 6 outwards, an inner shell 9, a detection layer 13, an expansion layer 11, an outer shell 10 and an elastic layer 12 are arranged in sequence.
The inside of the expansion layer 11 is the expansive soil modified by the nano graphite powder to provide expansion force.
The resilient layer 12 is on the housing 10 and automatically adjusts for contact with the bore wall 22 around the sensor.
The probe layer 13 receives signals around the borehole wall 22. The probe layer 13 is used for receiving signals similarly to a probe, and a plurality of receiving points are provided in the probe layer 13.
The spring 14 is connected to the inner and outer shells 9, 10 and acts such that when the device is retrieved, the expandable layer 11 contracts and the spring 14 pulls the outer shell 10 to contract.
The purpose of the runner 15 is that the housing 10 moves along the runner 15 when it contracts and expands, and that the tightness of the interior of the device is ensured.
The function of the catch lever 16 is to catch the device against the inner wall 22, preventing the device from moving back and forth.
The water inlet pipe 17 and the water outlet pipe 19 are connected with the expansion layer 11, and the water inlet pipe 17 and the water outlet pipe 19 are respectively provided with a water delivery pump 18 and a water suction pump 20 which are responsible for controlling water inlet and outlet in the expansion layer 11.
The cable 21 is connected with the sensor 6 and is responsible for transmitting the acquired data to a data acquisition center for analysis and processing.
During installation: the sensor device is placed in a prefabricated hole by holding the handle 2, the telescopic joint 3 of the mounting rod 1 can be extended when the hole is deep, the probe 7 is tightly attached to the front hole wall 22, the elastic bin 8 can be compressed at the moment, the elastic bin 8 reflects the force to the force measuring meter 4 through the lead 5, the force measuring meter 4 can display a numerical value with a certain size, and the probe 7 is tightly attached to the front hole wall 22 when the numerical value of the force measuring meter 4 reaches a preset value. At this time, the clamping rod 16 is adjusted to clamp the clamping rod 16 on two sides of the hole wall 22, so that the device cannot move back and forth.
Put into aquatic with inlet tube 17, close outlet pipe 19, open water delivery pump 18 and to swelling layer 11 water delivery, can take place the inflation after the improvement soil meets the water, shell 10 can move to pore wall 22 along spout 15, the elastic layer 12 in the shell 10 outside moves to pore wall 22 along with shell 10 together, spring 14 can be elongated under the effect of inflation power, can be compressed after elastic layer 12 and pore wall 22 contact, pressure passes to dynamometer 4 through wire 5, explain the device and pore wall 22 complete contact after dynamometer 4 reaches certain numerical value. And (4) closing the water delivery pump 18, retracting the water inlet pipe 17, adjusting the expansion joint 3 and completing installation.
When micro-fracture occurs, the probe 7 at the top and the probe layer 13 on the inner shell 9 can both receive signals, so that the sensitivity of the sensor is improved, and the received signals are transmitted to the sensor 6 and the cable 21 in sequence and then are analyzed and processed in a data acquisition center.
When in recovery: after gathering a period of time, along with the face constantly passes forward, the microseism sensor device need move forward, perhaps need overhaul when the sensor goes wrong, need dismantle the microseism sensor device this moment. The water outlet pipe 19 and the water pump 20 are opened to absorb water, the modified soil in the expansion layer 11 loses water and shrinks, the spring 14 pulls the shell 10 and the elastic layer 12 to shrink along the sliding groove 15, at the moment, the pressure of the elastic layer 12 is reduced, the value of the dynamometer 4 is reduced, and when the value of the dynamometer 4 is 0, the elastic layer 12 is separated from the hole wall 22. The water pump 20 is turned off and the water outlet pipe 19 is retracted.
Then the clamping rod 16 is disassembled, the pressure of the elastic bin 8 is reduced, the value of the force measuring meter 4 is reduced, and when the value of the force measuring meter 4 is 0, the elastic bin 8 is not compressed, and the probe 7 is not in contact with the hole wall 22. At this time, the microseismic sensor device is taken out by holding the handle 2.
Example 2
As a new embodiment or as a supplement to the material used in the part of the expansion layer in embodiment 1.
A microseismic sensor device based on an expansion material comprises five systems, namely a water control system, an expansion system, an acquisition system, an installation system and a force measuring system.
(1) The water control system includes: a water inlet pipe 17; a water delivery pump 18; a water outlet pipe 19; a suction pump 20.
(2) The expansion system comprises: an inner shell 9; a housing 10; an expandable layer 11; a spring 14; a chute 15.
(3) The acquisition system includes: a sensor 6; a probe 7; a probe layer 13; a cable 21.
(4) The mounting system includes: a mounting rod 1; a handle 2; an expansion joint 3; a chucking rod 16; and an aperture wall 22.
(5) The force measuring system comprises: 4, a dynamometer; a wire 5; an elastic bin 8; an elastic layer 12.
The following is stated for the intumescent material (intumescent strength) in the intumescent layer:
1. purpose(s) to
High strength and high expansion rate intumescent materials are desirable for installing microseismic sensors because of the ability to resist disturbance due to increased strength, the increased expansion rate makes the sensor more robust to installation, and such materials do not affect the quality of the signal received by the sensor. In order to find an expansive material for mounting a microseismic sensor, the invention uses nano graphite powder to improve expansive soil.
2. Material
The mineral composition of the expansive soil was obtained by x-ray diffraction (XRD), in which quartz was 67.13%, calcite was 30.27%, and montmorillonite was 2.6%. Montmorillonite is the main expansive mineral of expansive soil.
The purity of the nano graphite powder is 99.9%, the nano graphite powder has small volume, high surface energy, large specific surface area, a large number of surface atoms and dangling bonds, and greatly enhanced chemical activity. Compared with common graphite powder, it has excellent adsorption, antiwear, lubricating, magnetic, catalytic, stability and high conductivity.
3. Test protocol
The nano graphite powder is added into the expansive soil to obtain mixed samples with different mass fractions (0%, 0.5%, 1.0%, 1.5%, 2.0% and 2.5%). Then spraying distilled water to the optimal water content of 20.95%, stirring uniformly, and sealing in a plastic bag for 24 hours to fully mix. A modified soil sample was obtained.
(1) No load expansion ratio test
Respectively weighing 108.86g, 116.11g and 123.37g of improved soil, then pressing soil samples with different masses into a cutting ring to obtain the soil samples with dry densities of 1.5g/cm3、1.6g/cm3And 1.7g/cm3The ring knife sample of (1). The ring knife sample was mounted on the consolidometer and distilled water was injected. The change in swelling rate of the amended soil over 48h was recorded.
(2) Unconfined compressive strength test
Modified soil samples having masses of 174.17g, 185.78g, 197.39g were compacted in the sampler in 6 layers. The dry densities of the components are respectively 1.5g/cm3 and 1.6g/cm3And 1.7g/cm3A cylindrical sample having a diameter of 39.1mm and a height of 80mm was prepared and then saturated. The sample was placed on the base of an unconfined compression instrument with a thin layer of petrolatum applied to both ends and contacted with a compression plate as the base was slowly raised. The load cell reading is adjusted to zero and finally pressurized until the sample is destroyed.
4. Test results
(1) No load expansion ratio test
The no-load expansion rate of the improved soil at different dry densities is shown in fig. 3-5. In fig. 3-5, the present invention defines the unloaded expansion ratio corresponding to 48 hours as the maximum unloaded expansion ratio. The curve of the relationship between the content of the nano graphite powder and the maximum no-load expansion rate of the expansive soil is shown in fig. 6.
As can be seen from the graphs in FIGS. 3 to 5, the no-load expansion rate of the expansive soil changes with time under different dry densities and different dosages of the nano graphite powder. The improved soil sample has good free expansion potential after being soaked. The expansion rate of all the improved soil samples is relatively stable within 5 h. The no-load expansion rate of the expansive soil with different dry densities is improved after the nano graphite powder is added. Different from the rule of increasing the content of the nano graphite powder. When adding 1.5g/cm3The swelling ratios of 0.5% and 1.0% were the same with time at the dry density of (2), and the other amounts were referred to as stepwise changes. When the dry density is 1.6g/cm3During the process, the expansion rate of the expansive soil is obviously changed by adding the nano graphite powder. The non-load expansion rate of the improved soil is reduced along with the increase of the content of the nano graphite powder. When the dry density is 1.7g/cm3The curve spacing is reduced. The larger the dry density is, the smaller the influence of the content of the nano graphite powder on the no-load expansion rate of the expansive soil is.
As can be seen from fig. 6, the higher the dry density, the higher the maximum no-load expansion ratio of the improved soil. The greater the dry density, the more hydrophilic minerals, and the more significant the water absorption at the same volume. Dry density 1.5g/cm3And 1.6g/cm3The maximum expansion rate of the graphite powder fluctuates obviously along with the change of the content of the nano graphite powder. The difference of the maximum expansion rate of the improved soil under two dry densities is not large. At a dry density of 1.5g/cm3Under the condition, the expansion rate reaches the maximum value when the content of the nano graphite powder is 2.5 percent, and is 93.88 percent higher than that of the expansive soil without the nano graphite powder. When the dry density is 1.6g/cm3And 1.7g/cm3When the content of the nano graphite powder is 0.5%, the expansion rate is highest, and is respectively improved by 82.8% and 19.81%. When the dry density is 1.7g/cm3The maximum expansion ratio is stable with the change of the content of the nano graphite powder, which shows that the dry density is stableUnder the temperature, the expansion of the expansive soil is not greatly influenced by the nano graphite powder. At this time, the influence of the dry density on the maximum expansion ratio of the expansive soil is more remarkable than that of the nano graphite powder.
(2) Unconfined compressive strength test
The axial stress is taken as the ordinate, and the axial stress is taken as the abscissa. Axial stress is plotted against axial strain as shown in fig. 7-9. The maximum axial stress on the curve is taken as the unconfined compressive strength. The fitted curve of the compressive strength of the improved soil with the content of the nano graphite powder is shown in fig. 10.
From fig. 7-9, it can be seen that the peak strength is taken as the unconfined compressive strength of the soil sample, and the unconfined compressive strength of the expansive soil is improved after the nano graphite powder is added. When the dry density is 1.5g/cm3And 1.6g/cm3The compressive strength is 1.5% at most, and is respectively improved by 136.544% and 67.459%. When the dry density is 1.7g/cm3When the mixing amount is 1.0%, the compressive strength is highest, and is increased by 41.054%. With the increase of the dry density, the difference value of the soil peak intensity under different nano graphite powder dosage is gradually reduced. The more remarkable the dry density is, the weaker the reinforcing effect of the nano graphite powder on the compressive strength of the expansive soil is.
As can be seen from fig. 10, the compressive strength of the expansive soil exponentially changes (EXP) as the content of the nano graphite powder increases. Dry density is directly proportional to compressive strength. With the increase of the content of the nano graphite powder, the shear strength is increased firstly and then reduced. The dry density was 1.5g/cm3When the content is 1.519%, the compressive strength ymax271.239 kPa. When the dry density is 1.6g/cm3Compressive strength ymax331.292kPa when dry density is 1.7g/cm3Compressive strength ymax1.306% compressive strength ymax444.522 kPa. When the dry density of the expansive soil is uncertain, the optimal mixing amount of the three dry densities is 1.450 percent, and the optimal mixing amount is used as the final nanometer graphite powder for improving the optimal mixing amount of the expansive soil. When the optimal mixing amount is 1.450%, the dry density is 1.5g/cm3、1.6g/cm3And 1.7g/cm3When the compressive strength of the expansive soil is 270.697kPa, 330.961kPa and 442.748kPa, the compressive strength is respectively improved by 127.773%, 59.132% and 41.821%.
In conclusion, the nano graphite obviously improves the expansion rate and the strength of the expansive soil, and can change the dry density of the expansive soil and the doping amount of the nano graphite powder under different installation environments by combining experimental results to adjust the expansion force and the strength.
The main innovation points of the invention are as follows: (1) the strength and the expansion rate of the modified expansive soil are increased, the strength is increased, disturbance can be resisted, and the expansion rate is increased, so that the sensor can be installed more firmly. (2) The sensor is simple to install and convenient to recover, and does not need to be reinforced with cement. (3) The sensor is more sensitive.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (5)
1. A microseismic sensor device based on an intumescent material comprising: installation pole (1), handle (2), dynamometer (4), wire (5), sensor (6), probe (7), elasticity storehouse (8), inner shell (9), shell (10), inflation layer (11), elasticity layer (12), survey layer (13), spring (14), spout (15), kelly (16), installation pole (1) one end with handle (2) are connected, the other end with sensor (6) one end is connected, sensor (6) the other end with elasticity storehouse (8) are connected, probe (7) with elasticity storehouse (8) are connected, sensor (6) periphery by interior toward setting gradually inner shell (9), survey layer (13), inflation layer (11), shell (10), elasticity layer (12) outward, set up on installation pole (1) dynamometer (4), dynamometer (4) pass through wire (5) respectively with survey layer (13), Elasticity storehouse (8) are connected, set up in inflation layer (11) a plurality of spring (14), spring (14) one end is connected inner shell (9), the other end are connected shell (10), shell (10) with spout (15) slidable connection, kelly (16) with installation pole (1) are connected.
2. The microseismic sensor device based on expanded material according to claim 1 wherein the expanded layer (11) is filled with expansive soil which has the following mineral composition and proportions obtained by x-ray diffraction: wherein the quartz accounts for 67.13 percent, the calcite accounts for 30.27 percent and the montmorillonite accounts for 2.6 percent.
3. The expanded material-based microseismic sensor device of claim 1 further comprising a telescopic joint (3) for extending the mounting rod (1), the telescopic joint (3) being mounted on the mounting rod (1).
4. The dilatant-based microseismic sensor device of claim 1 further comprising an inlet pipe (17), a water delivery pump (18), an outlet pipe (19), a water suction pump (20), both the inlet pipe (17) and the outlet pipe (19) being connected to the dilatant layer (11), the water delivery pump (18) being mounted on the inlet pipe (17), the outlet pipe (19) being mounted on the outlet pipe (19).
5. The dilatant-based microseismic sensor device of claim 1 further including a cable (21), wherein the cable (21) is connected to the sensor (6) at one end and to a data acquisition center at the other end.
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