CN114088283B - Seabed super-pore pressure observation probe rod capable of automatically correcting zero drift in situ and observation method - Google Patents
Seabed super-pore pressure observation probe rod capable of automatically correcting zero drift in situ and observation method Download PDFInfo
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Abstract
The invention relates to a submarine ultra-pore pressure observation probe rod capable of automatically correcting zero drift in situ and an observation method, wherein the submarine ultra-pore pressure observation probe rod comprises a probe rod body and a pressure-resistant bin, a data acquisition instrument, a master control system and a lithium battery are installed in the pressure-resistant bin, a watertight connector is installed at the top of the pressure-resistant bin of the probe rod in a sealing manner, the bottom of the pressure-resistant bin of the probe rod is connected with the probe rod body through an open auxiliary bin, a watertight cable of the data acquisition instrument penetrates through the pressure-resistant bin of the probe rod and is introduced into the probe rod body through the auxiliary bin, and the outer wall of the auxiliary bin is connected with a columnar metal permeable stone; the probe rod body comprises hollow probe rod units, two adjacent probe rod units are connected through a connecting piece, a bottom seawater channel is arranged inside the connecting piece, a pore fluid channel is further arranged inside the connecting piece, an annular metal permeable stone is arranged outside the connecting piece, and the upper part and the lower part of each pore fluid channel are respectively connected with a pore pressure sensor and an in-situ zero drift correction device in a sealing mode. The probe rod has the function of automatically correcting zero drift in situ, has high integral stability, and gives consideration to the structural reliability and the use efficiency of the sensor.
Description
Technical Field
The invention relates to the technical field, in particular to a submarine ultra-pore pressure observation probe rod capable of automatically correcting zero drift in situ and an observation method.
Background
The pore pressure is a basic soil body parameter and can be used for judging the mechanical property of the soil body. The pore pressure of the seabed sediment is sensitive to the reaction of the seabed geological disaster process, and is an important index for representing the seabed stability. Just as can monitor and diagnose various cardiovascular and cerebrovascular diseases through human blood pressure, the steady state of the seabed can be judged through the pore pressure monitoring of the seabed sediments, and the method has very important significance for monitoring and early warning of seabed geological disasters. International pore pressure monitoring technology develops gradually from the last 60 th century to form a series of core technologies and mature commercial products, while domestic pore pressure monitoring technology is still in the initial stage and is not developed yet. In recent years, a large number of national-level ocean engineering construction projects marked by Gangzhaoqiao bridge construction, south sea natural gas hydrate pilot mining and the like are all the time on, the safety and stability of ocean engineering construction operation are the most important, and the requirement of China for monitoring the submarine pore pressure is more urgent.
The specific realization form of the monitoring of the pore pressure of the submarine sediments is that a slender rod provided with a pore pressure sensor is vertically penetrated into the position below the surface of the submarine bed by a certain depth, so that the pore pressure sensor is immersed into the submarine sediments, the pore pressure sensor arranged on the rod body of the probe rod measures the pore pressure change in the submarine sediments in real time, and the acquired pore pressure data is stored in the probe rod acquisition cabin. Pore pressure sensors commonly used for subsea sediment pore pressure monitoring include: resistive sensors, capacitive sensors, steel wire sensors, etc., and in addition, fiber optic pore pressure sensors are also beginning to be used in subsea pore pressure monitoring devices. The pore pressure measuring mode of the sensor comprises total pressure type measurement and ultra-pore pressure type measurement, wherein the internal structure of the total pressure type measuring sensor is relatively simple, but the sensor can only be applied to shallow sea areas with shallow water depth, and for deep sea bottom in high-pressure environment, the sensor for ultra-pore pressure type measurement must be selected. It is the excess pore pressure, not the total pore pressure, that is capable of reflecting the dynamic characteristics of seafloor sediments. The value of the super-pore pressure in the deep sea sediment is much smaller than the total pore pressure, the super-pore pressure is directly measured, the measuring range of the sensor does not need to be too large, the measuring precision of the sensor can reach the cm level, and the measured high-resolution super-pore pressure data has important significance for marine scientific research and engineering application. The internal structure of the super-pore pressure type measuring sensor is relatively complex, the super-pore pressure type measuring sensor usually has two water inlets of pore water and bottom seawater, and the super-pore pressure is measured by sensing the difference value of the pore water and the bottom seawater inside the super-pore pressure type measuring sensor.
The device for monitoring the pore pressure of the sediment at the sea bottom usually needs to perform observation tasks for months and years at the sea bottom, when a detection signal of the sensor is zero (no induction signal fluctuation), because long-time observation is influenced by an external environment, a static working point of the sensor shifts, and is amplified and transmitted step by step, so that a signal output by an acquisition instrument deviates from an original fixed value of the static working point and drifts up and down, and the phenomenon is called zero drift (simply called as null drift) of the sensor. When the sensor null shift phenomenon is serious, effective sensor signals are often submerged, the measurement accuracy of the pore pressure sensor is reduced, and the use of pore pressure data is influenced.
Therefore, the cause of the null shift and the method of suppressing the null shift must be found. In order to avoid the influence of the sensor zero drift on the seabed observation, seabed pore pressure monitoring equipment is required to be recovered every month, then the pore pressure sensor is subjected to zero drift correction in a laboratory, and the seabed is laid after the correction is finished. However, repeated equipment deployment and recovery easily cause equipment damage, and the laboratory sensor correction also needs to disassemble the observation equipment, which consumes a great deal of manpower, material resources and financial resources. In addition, the laboratory corrected submarine observation window period can also cause the discontinuous observation process and influence the observation quality. At present, a seabed super-pore pressure observation probe rod with an in-situ automatic zero drift correction function and a method thereof are not available.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the seabed super-pore pressure observation probe rod and the method for automatically correcting the zero drift in situ, which are used for automatically correcting the zero drift of the pore pressure sensor and improving the use efficiency of the observation probe rod and the quality of long-term continuous observation data.
The invention is realized by the following technical scheme:
provides a submarine ultra-pore pressure observation probe rod capable of automatically correcting zero drift in situ, which comprises a probe rod body and a probe rod pressure-resistant bin arranged at one end of the probe rod body,
the inside of the pressure-resistant bin of the probe rod is provided with a data acquisition instrument, a master control system and a lithium battery for power supply, the top of the pressure-resistant bin of the probe rod is hermetically provided with a watertight connector and a plug-in sealing cap which are electrically connected with the master control system, the bottom of the pressure-resistant bin of the probe rod is hermetically connected with the probe rod body through an open auxiliary bin, a watertight cable of the data acquisition instrument penetrates through the pressure-resistant bin of the probe rod and is introduced into the probe rod body through the auxiliary bin, the outer wall of the auxiliary bin is provided with a hydrostatic pressure port penetrating through the auxiliary bin, and the port is internally connected with a columnar metal permeable stone;
the probe rod body comprises a plurality of hollow probe rod units, two adjacent probe rod units are connected through a connecting piece in a sealing manner, a bottom layer seawater channel which is communicated with each other is formed in the axis direction of the probe rod units in the connecting piece, hole fluid channels which are communicated with the connecting piece and are parallel to the external seawater channels are formed in the connecting piece, annular metal permeable stones are installed in the connecting piece in an embedded manner, transverse channels which are communicated with the hole fluid channels and the metal permeable stones are formed in the connecting piece in the inner portion respectively, each hole fluid channel is connected with a super-hole pressure sensor on the upper end face of the connecting piece in a sealing manner, each hole fluid channel is connected with an in-situ zero-drift correction device on the lower end face of the connecting piece in a sealing manner, and each in-situ zero-drift correction device and each super-hole pressure sensor are electrically connected with a watertight cable through a watertight connector.
Furthermore, the in-situ zero drift correction device comprises a shell with a cylindrical cavity arranged therein, a threaded portion connected with a pore fluid channel in a threaded manner is arranged at the top of the shell, a pore fluid water inlet communicated with the cylindrical cavity is formed in the center of the threaded portion, a bottom seawater inlet is circumferentially formed in the upper portion of the shell of the cylindrical cavity, a limiting plate is fixed below the inner water inlet of the cylindrical cavity, a piston is vertically arranged above the limiting plate in a sliding manner, and an electric control driving mechanism capable of driving the piston to vertically move to block the seawater inlet is arranged below the limiting plate.
Furthermore, automatically controlled actuating mechanism includes solenoid and push rod, solenoid fixes in the cylindrical cavity and its control line passes through the watertight cable and is connected with the total control system electricity, the push rod sets up in the solenoid top, and the bottom is connected with the spliced pole that passes solenoid, the tip of spliced pole is fixed with the iron plate below solenoid, the spliced pole overlaps between solenoid and iron plate and is equipped with first spring, be provided with in the cylindrical cavity above the push rod with push rod complex cam, the inner wall of cylindrical cavity is provided with can carry out spacing bulkhead slide rail with cam sliding fit and to the cam position, the vertical rotation in axle center department of cam top is connected with the shaft, the shaft upper end runs through the limiting plate and offsets with the piston, fixed the cover is equipped with the fixed plate on the shaft, and the shaft overlaps between limiting plate and fixed plate and is equipped with the second spring.
Further, the cam includes hollow connecting axle and sets up four cam latch at connecting axle circumference, and the even protruding slide rail latch that is equipped with of lateral wall circumference of push rod, the top circumference of push rod is formed with spacing latch, push rod top circumference be formed with cam latch complex spacing latch, the protruding slide rail latch that is formed with each spacing latch one-to-one that establishes of push rod lateral wall.
Furthermore, the bin wall slide rail comprises slide rail clamping teeth and slide rail grooves, the slide rail grooves comprise low clamping grooves allowing the cam clamping teeth to enter and high clamping grooves not allowing the cam clamping teeth to enter, the groove depths of the high clamping grooves and the low clamping grooves are different, and the two grooves are arranged at intervals; the slide rail latch is higher than the cam latch, and the cam latch is higher than the limiting latch.
Furthermore, a hanging ring is further installed at the top of the pressure-resistant bin of the probe rod, and the other end of the probe rod body is connected with a conical tip.
An observation method of a seabed super-pore pressure observation probe rod using in-situ automatic zero drift correction comprises the following steps:
s1, connecting the watertight connector of the probe rod pressure-resistant bin with an external computer upper computer, waking up a master control system, debugging the working state, working parameters and acquisition frequency of each ultra-pore pressure sensor, setting the correction time period of the in-situ zero drift correction device, switching the in-situ zero drift correction device to be in a zero drift correction state, disconnecting a communication cable, and sealing the watertight connector by using a watertight connector cap;
s2, switching a zero drift correction state to shield the environmental super-pore pressure in the process of observing the launching of the probe rod launching cloth into the sea bottom, wherein the super-pore pressure value of the super-pore pressure sensor in the probe rod body is always maintained to be 0;
s3, after the penetration of the probe rod is finished, standing for 1-2 hours, switching to a normal measurement state after the environmental super-pore pressure is dissipated, and controlling the bottom seawater in the probe rod and the pore fluid in the bottom sediment to be in a non-communicated state by the master control system at the moment, wherein the super-pore pressure value measured by the super-pore pressure sensor is not 0;
s4, after observing for a period of time, entering a periodic zero drift correction state, after reaching the correction time point, the master control system controls and switches the zero drift correction state,
if the value of the super-pore pressure measured by the super-pore pressure sensor is 0, the super-pore pressure sensor is in a stable state and works normally, and the value of the super-pore pressure measured by the super-pore pressure sensor is the true value of the super-pore pressure;
if the pressure value measured by the super-pore pressure sensor is not 0, the super-pore pressure sensor generates zero drift and works abnormally; at the moment, the master control system records the value of the super-pore pressure measured by the super-pore pressure sensor
According to a correction formula
Calculating to obtain the true value of the super-pore pressure
；
S5, after the periodic zero drift correction is finished, the normal measurement state is reached, at the moment, the master control system controls the bottom seawater in the probe rod and the pore fluid in the bottom sediment to be in a non-communicated state, and the in-situ zero drift correction device is in a normal measurement state.
Further, in step S2, the zero drift correction method of the in-situ zero drift correction device includes that the master control system controls the lithium battery to energize the electromagnetic coil, the electromagnetic coil energizes to generate magnetic force to attract the iron block to move upward to compress the first spring, the push rod is driven to move upward along the slide rail groove of the bin wall slide rail, the limiting latch on the upper portion of the push rod ejects the cam latch on the lower portion of the cam out of the high latch groove of the slide rail groove of the bin wall slide rail, the master control system controls the lithium battery to de-energize the electromagnetic coil, the magnetic force disappears after the de-energizing, the cam latch on the lower portion of the cam slides into the low latch groove under the action of the second spring, the piston moves downward under the driving of the cam to open the bottom seawater inlet of the in-situ zero drift correction device, and the bottom seawater in the probe rod is communicated with the pore fluid in the bottom sediment to complete the zero drift correction.
The invention has the beneficial effects that:
the zero drift of the seabed in-situ automatic correction pore pressure sensor improves the use efficiency of the observation probe rod and the quality of long-term continuous observation data. The zero drift correction period and the correction time of the sensor are automatically set according to the pore pressure sensors with different measurement ranges, the practicability of the correction device is improved, and the application range is expanded. The zero drift correction device can realize shielding and observing ultrahigh pore pressure change generated in the penetration process of the probe rod, protect the sensor from being damaged beyond the measuring range, and indirectly improve the measurement precision of the sensor. The null shift correction device is arranged inside the observation probe rod, is less impacted by the external environment and has high stability. The zero drift automatic correction device is not in direct contact with the pore pressure sensor, can realize the automatic correction of the zero drift of the sensor under the condition of not influencing the normal use of the observation probe rod, and improves the use efficiency of the sensor.
The sensor has the advantages of simple structure, fewer movable parts, high overall stability and high reliability, and can give consideration to the reliability of the structure and the service efficiency of the sensor.
Drawings
FIG. 1 is a schematic diagram of the general structure of a sea bottom sediment superporous pressure observation probe rod.
Fig. 2 is a schematic view of the overall structure of the connector of the present invention.
FIG. 3 is a schematic diagram of the principle of in-situ long-term observation of the measurement of the probe rod for the super-pore pressure in the invention.
Fig. 4 is a schematic view of an assembly structure between the connecting member and the probe unit according to the present invention.
FIG. 5 is a schematic diagram of an external structure of the in-situ null shift correction device according to the present invention.
FIG. 6 is a top view of the in-situ zero drift correction device of the present invention.
FIG. 7 is a schematic diagram of the internal structure of the in-situ zero drift correction device according to the present invention.
Fig. 8 is a schematic structural view of the cam in the present invention.
Fig. 9 is a top view of fig. 8.
Fig. 10 is a bottom view of fig. 8.
Fig. 11 is a schematic structural view of the push rod of the present invention.
Fig. 12 is a schematic cross-sectional view of fig. 11.
Fig. 13 is a top view of fig. 11.
FIG. 14 is a schematic view of the internal structure of the sliding rail of the bin wall of the present invention.
Fig. 15 is a top view of fig. 14.
FIG. 16 is a schematic structural diagram A-B of the in-situ zero drift correction device of the present invention during operation.
FIG. 17 is a schematic structural diagram C-D of the in-situ zero drift correction device of the present invention during operation.
FIG. 18 is a schematic structural diagram E-F of the in-situ zero drift correction device of the present invention during operation.
FIG. 19 is a flowchart illustrating the operation of the in-situ zero drift correction apparatus of the present invention.
Shown in the figure:
1. lifting rings, 2, watertight connectors, 3, pressure-resistant bins, 4, cylindrical metal permeable stones, 5, hydrostatic pressure ports, 6, probe rod units, 7, connecting pieces, 8, conical tips, 9, annular metal permeable stones, 10, threaded ports, 11, watertight cables, 12, ultra-pore pressure sensors, 13, bottom seawater channels, 14, pore fluid channels, 15, nuts, 16, O-shaped rubber rings, 17, in-situ zero drift correction devices, 18, transverse channels, 19, threaded parts, 20, bottom seawater inlets, 21, shells, 22, pore fluid inlets, 23, pistons, 24, supporting rods, 25, limiting plates, 26, second springs, 27, fixing plates, 28, axles, 29, cams, 30, bin wall slide rails, 31, push rods, 32, electromagnetic coils, 33, first springs, 34, iron blocks, 35, connecting columns, 36, cam latch teeth, 37, iron blocks, 35, connecting columns, 36, Connecting shaft, 38, spacing latch, 39, slide rail latch, 40, high screens recess, 41, low screens recess, 42, slide rail recess.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.
The utility model provides a seabed super pore pressure observation probe rod of normal position automatic correction zero drift, includes the probe rod body and sets up the withstand voltage storehouse of probe rod 3 in probe rod body one end, and rings 1 is still installed at the top in the withstand voltage storehouse of probe rod 3 for lift by crane the probe rod, the pointed end 8 of toper is connected to the other end of probe rod body.
The internally mounted of the withstand voltage storehouse of probe rod 3 has the data acquisition appearance, total control system and be used for the lithium cell of power supply, the watertight connector 2 and the plug-in components sealing cap that are connected with total control system electricity are installed to the top sealing in the withstand voltage storehouse of probe rod 3, open vice storehouse and this body sealing connection of probe rod are passed through to the bottom in the withstand voltage storehouse of probe rod 3, the watertight cable of data acquisition appearance runs through the withstand voltage storehouse of probe rod 3 and this internally through vice storehouse introduction probe rod, the hydrostatic pressure port 5 that runs through vice storehouse is seted up to vice storehouse outer wall and is connected with column metal permeable stone 4 in the port in. The metal permeable stone is used as a hydrostatic pressure port 5, bottom seawater can be introduced into the probe rod, and suspended particulate matters in the seawater cannot enter the probe rod.
The data acquisition instrument is used for demodulating the signal change acquired by each super-pore pressure sensor of the probe rod and converting the signal change information into an observation physical quantity, namely super-pore pressure QUOTE
. The power supply cable of the data acquisition instrument is connected to the lithium battery pack inside the pressure-resistant bin of the probe rod, the data transmission cable is connected to the master control system inside the pressure-resistant bin 3 of the probe rod through an RS232 interface, and the data communication cable is connected with the super-pore pressure sensor 12 installed on the probe rod connecting piece 7 through the watertight connector 2 of the pressure-resistant bin 3 of the probe rod for communication. The master control system and the data acquisition instrument perform bidirectional data communication, on one hand, the master control system can send control commands (equipment awakening, equipment dormancy, equipment state information acquisition, equipment parameter resetting and the like) to the optical fiber multi-parameter demodulation instrument, and on the other hand, the master control system can receive the data information acquired by the data acquisition instrument and the fed back equipment state information. The 12V lithium battery pack is connected with the master control system and the data acquisition instrument through power supply interface cables to supply power.
The main control system body part comprises an ARM microcontroller and a 256G high-speed data storage SD card, the main control system sends a total control command through an ARM processor, and observation data are stored through the data storage SD card; the power supply cable and the data transmission cable of the master control system are respectively connected to the lithium battery pack, the watertight connector 2 and the data acquisition instrument inside the pressure-resistant bin 3 of the probe rod. The control cable of the master control system, the data acquisition instrument and the watertight connector 2 implement bidirectional data communication through an RS232 interface; on one hand, the master control system can send control commands (equipment awakening, equipment sleeping, equipment state information acquisition, equipment parameter resetting and the like) to the data acquisition instrument, the watertight connector 2 and the lithium battery pack, and on the other hand, the master control system can receive data information (system control commands, system state information, system parameter information, observation data information and the like) fed back by the data acquisition instrument, the watertight connector 2 and the lithium battery pack.
The probe rod body comprises a plurality of hollow probe rod units 6, the two adjacent probe rod units 6 are connected through a connecting piece 7 in a sealing mode, double-layer water-proof O-shaped rubber rings 16 are arranged at the joints of the upper side and the lower side of the probe rod connecting piece 7, and it is guaranteed that pore fluid can only enter the probe rod from the metal permeable stone 9.
A through bottom layer seawater channel 13 is formed in the axial direction of the probe rod unit 6 in the connecting piece 7, a pore fluid channel 14 which is parallel to the external seawater channel and penetrates through the connecting piece 7 is formed in the connecting piece 7, an annular metal permeable stone 9 is embedded and installed outside the connecting piece 7, the metal permeable stone 9 is arranged in the center of the probe rod connecting piece 7 and serves as a bottom layer seawater inlet 20, the metal permeable stone 9 is directly embedded and installed outside the probe rod connecting piece 7 and is clamped, installed and fixed through the hollow probe rod units 6 on the upper side and the lower side, a single-layer water-proof O-shaped rubber ring 16 is arranged at the joint of the annular metal permeable stone 9 and the hollow stainless steel probe rod units 6 on the upper side and the lower side, and pore fluid can only enter the pore fluid channel 14 in the probe rod connecting piece 7 from the annular metal permeable stone 9; the annular metal permeable stone 9 is a filter element structure formed by sintering 316L stainless steel powder at a high temperature, has the characteristics of high mechanical strength, high temperature resistance, corrosion resistance and uniform aperture, and can enable pore fluid to permeate and sediment particles to be blocked outside.
In the present embodiment, three pore fluid channels 14 are disposed in the connecting member 7, each pore fluid channel 14 is connected to the upper end surface of the connecting member 7 in a sealing manner with a super pore pressure sensor 12, each pore fluid channel 14 is connected to the lower end surface of the connecting member 7 in a sealing manner with an in-situ null shift correction device 17, and each in-situ null shift correction device 17 and each pore pressure sensor 12 are electrically connected to the watertight cable 11 through the watertight connector 2.
The ultra-pore pressure sensor 12 comprises a pore pressure port and a hydrostatic pressure port, a stainless steel probe rod unit 6 of a sealed ultra-pore pressure observation probe rod is penetrated into seabed sediment during seabed observation, a probe rod pressure-resistant bin 3 and an open auxiliary bin are positioned in seawater, a hydrostatic pressure port 5 of the probe rod open auxiliary bin 3 is communicated with external seawater, and hydrostatic pressure QUOTE is measured
The probe rod unit 6 is led in to act on one side of the super-pore pressure sensor 12; pore pressure QUOTE in subsea sediments
The pressure difference acting on the other side of the super-pore pressure sensor 12 is the super-pore pressure QUOTE of the sediment outside the position through the metal permeable stone outside the probe rod connecting piece 7
. The upper part of the super-pore pressure sensor 12 is a watertight connector and is connected to a data acquisition instrument in the probe rod pressure-resistant bin 3 through a watertight cable 11.
The in-situ null shift correction device 17 comprises a 316L stainless steel shell 21 with a cylindrical cavity arranged therein, the top of the shell 21 is provided with a threaded part 19 in threaded connection with a pore fluid channel 14, the center of the threaded part 19 is provided with a pore fluid inlet 22 communicated with the cylindrical cavity, the cylindrical cavity is circumferentially provided with a bottom seawater inlet 20 at the upper part of the shell 21, a limiting plate 25 is fixed below the water inlet 22 in the cylindrical cavity, a piston 23 is vertically and slidably arranged above the limiting plate 25, and an electric control driving mechanism capable of driving the piston 23 to vertically move to block the bottom seawater inlet 20 is arranged below the limiting plate 25. The piston 23 is a sealed, waterproof and heat-proof material, and a single-layer water-proof O-shaped rubber ring 16 is arranged at the position where the two sides of the piston 23 are in contact with the in-situ zero drift correction device 17, so that pore fluid cannot enter the in-situ zero drift correction device 17.
The electric control driving mechanism comprises an electromagnetic coil 32 and a push rod 31, the electromagnetic coil 32 is fixed in a cylindrical cavity, a control line of the electromagnetic coil 32 is electrically connected with a master control system through a watertight cable 11, the push rod 31 is arranged above the electromagnetic coil 32, the bottom of the push rod 31 is connected with a connecting post 35 penetrating through the electromagnetic coil 32, an iron block 34 is fixed at the end part of the connecting post 35 below the electromagnetic coil 32, a first spring 33 is sleeved on the connecting post 35 between the electromagnetic coil 32 and the iron block 34, a cam 29 matched with the push rod 31 is arranged above the push rod 31 in the cylindrical cavity, a bin wall slide rail 30 which is matched with the cam 29 in a sliding way and limits the position of the cam 29 is arranged on the inner wall of the cylindrical cavity, a wheel shaft 28 is vertically and rotatably connected at the axis above of the cam 29, a support rod 24 penetrating through a limit plate 25 and abutting against a piston 23 is connected at the upper end of the wheel shaft 28, a fixing plate 27 is fixedly sleeved on the support rod 24 above the wheel shaft 28, and the support rod 24 is sleeved with a second spring 26 between the limit plate and the fixing plate 27.
The cam 29 comprises a hollow connecting shaft 37 and four cam latch teeth 36 arranged on the periphery of the connecting shaft 37, slide rail latch teeth 39 are uniformly and convexly arranged on the periphery of the side wall of the push rod 31, limit latch teeth 38 are circumferentially formed on the top of the push rod 31, limit latch teeth 38 matched with the cam latch teeth 36 are circumferentially formed on the top of the push rod 31, and slide rail latch teeth 39 corresponding to the limit latch teeth 38 one to one are convexly arranged on the side wall of the push rod 31.
The bin wall slide rail 30 comprises slide rail latches 39 and slide rail grooves 42, the slide rail grooves 42 comprise low detent grooves 41 allowing the cam latches 36 to enter and high detent grooves 40 not allowing the cam latches 36 to enter, the groove depths of the high detent grooves 40 and the low detent grooves 41 are different, and the two grooves are arranged at intervals; the slide rail latch 39 is higher than the cam latch 36, and the cam latch 36 is higher than the limit latch 38. The slide rail latch 39 of the push rod 31 can move in the slide rail groove 42, and the slide rail groove 42 limits the slide rail latch 39 of the push rod 31 to move up and down only along the slide rail groove 42.
An observation method of a seabed super-pore pressure observation probe rod using in-situ automatic zero drift correction comprises the following steps:
s1, assembling an observation probe rod on a deck, connecting one end of a one-in-two data communication cable with a watertight connector 2 on the upper part of a pressure-resistant cabin 3 of the probe rod, connecting the other end of the one-in-two data communication cable with an external computer upper computer and an external power supply through a USB interface and a power supply interface respectively, awakening a master control system through the external computer upper computer, checking system state information, debugging the working state of each super-pore pressure sensor 12, setting the working parameters and the acquisition frequency of each super-pore pressure sensor 12, setting the parameters such as the correction time period of an in-situ zero drift correction device 17 and the like, and switching the in-situ zero drift correction device to be in a zero drift correction state. The master control system controls the lithium battery pack to electrify the electromagnetic coil 32, the electromagnetic coil 32 can generate magnetic force after being electrified to attract the iron block 34 to move upwards, so that the first spring 33 is compressed, the push rod 31 is driven to move upwards along the slide rail groove 42 of the bin wall slide rail 30, and the limiting latch 38 on the upper portion of the push rod 31 ejects the cam latch 36 on the lower portion of the cam 29 out of the high latch groove 40 of the slide rail groove 42 of the bin wall slide rail 30. At this time, the master control system controls the lithium battery pack to cut off the power supply to the electromagnetic coil 32, after the power supply to the electromagnetic coil 32 is cut off, the magnetic force disappears, and the cam latch 36 at the lower part of the cam 29 slides to the low latch groove 41 of the slide rail groove 42 of the bin wall slide rail 30 under the pressure action of the second spring 26. The piston 23 moves downwards under the driving of the cam 29, the bottom seawater inlet 20 of the in-situ zero drift correction device is opened, the bottom seawater in the probe rod and the pore fluid in the bottom sediment are in a communication state, and the in-situ zero drift correction device 17 is in a zero drift correction state at the moment. After the setting is finished, the probe rod is disconnected from the external cable, and the watertight connector 2 at the upper part of the probe rod pressure-resistant bin 3 is sealed by using a watertight connector cap.
S2, observing that water is filled inside and outside the probe rod after the probe rod is laid with water, wherein the probe rod is filled with water inside and outside at the moment, the internal and external pressures are balanced, and the value of the super-pore pressure measured by the super-pore pressure sensor 12 is 0. After the probe rod starts to penetrate into the seabed, the probe rod body has a reaming effect on seabed sediments in the process of penetrating into the seabed, the seabed sediments have an extrusion effect on the inner penetrating probe rod, and the effect causes the contact area of the probe rod body and the sediments to generate extremely high super-pore pressure instantly. At this time, the in-situ zero drift correction device 17 is in a zero drift correction state, high-pressure pore fluid in the submarine sediment enters the pore fluid channel 14 through the metal permeable stone of the probe rod connecting piece 7, one part of the high-pressure pore fluid reaches the super-pore pressure sensor 12, the other part of the high-pressure pore fluid reaches the pore water inlet 22 of the in-situ zero drift correction device 17, and the high-pressure pore fluid reaches the interior of the probe rod through the bottom seawater inlet 20 and is neutralized with hydrostatic pressure generated by bottom seawater in the interior of the probe rod, so that the super-pore pressure value measured by the super-pore pressure sensor 12 is 0 at this time, and the super-pore pressure sensor 12 cannot exceed the sensor range due to the ultra-high pore pressure generated by probe rod penetration, so that the sensor is damaged.
And S3, standing for 1-2 hours after the penetration of the probe rod is observed, and gradually dissipating the environmental supercavity pressure to reach a state of normal measurement. At the moment, the master control system controls the lithium battery pack to electrify the electromagnetic coil 32, the electromagnetic coil 32 can generate magnetic force after being electrified to attract the iron block 34 to move upwards, so that the first spring 33 is compressed, the push rod 31 is driven to move upwards along the slide rail groove 42 of the bin wall slide rail 30, and the limiting latch 38 on the upper part of the push rod 31 ejects the cam latch 36 on the lower part of the cam 29 from the low latch groove 41 of the slide rail groove 42 of the bin wall slide rail 30. At this time, the master control system controls the lithium battery pack to power off the electromagnetic coil 32, after the electromagnetic coil 32 is powered off, the magnetic force disappears, and the cam latch 36 on the lower portion of the cam 29 slides to the high latch groove 40 of the slide groove 42 of the bin wall slide rail 30 under the pressure action of the second spring 26. The piston 23 moves upwards under the driving of the cam 29 to seal the bottom seawater inlet 20 of the in-situ zero drift correction device 17, and the bottom seawater inside the probe rod is not communicated with the pore fluid inside the seabed sediment. The in-situ null shift correction device 17 is in a normal measurement state at this time, and the value of the super-pore pressure measured by the super-pore pressure sensor 12 is not 0.
And S4, after the observation probe rod is observed for a period of time, entering a periodic zero drift correction state. After the correction time point is reached, the master control system controls the lithium battery pack to electrify the electromagnetic coil 32, the electromagnetic coil 32 can generate magnetic force after being electrified to attract the iron block 34 to move upwards, so that the first spring 33 is compressed, the push rod 31 is driven to move upwards along the slide rail groove 42 of the bin wall slide rail 30, and the limiting latch 38 on the upper part of the push rod 31 ejects the cam latch 36 on the lower part of the cam 29 from the high latch groove 40 of the slide rail groove 42 of the bin wall slide rail 30. At this time, the master control system controls the lithium battery pack to be powered off to the electromagnetic coil 32, after the electromagnetic coil 32 is powered off, the magnetic force disappears, and the cam latch 36 on the lower portion of the cam 29 slides to the low latch groove 41 of the slide rail groove 42 of the bin wall slide rail 30 under the pressure action of the second spring 26. The piston 23 moves downwards under the driving of the cam 29, the bottom seawater inlet 20 of the in-situ zero drift correction device 17 is opened, and the bottom seawater inside the probe rod and the pore fluid inside the seabed sediment are in a communication state. In-situ zero drift correction deviceThe device 17 is in a zero drift correction state at this time, if the value of the super-pore pressure measured by the super-pore pressure sensor 12 is 0 at this time, the super-pore pressure sensor 12 is in a stable state and works normally, and the value of the super-pore pressure measured by the super-pore pressure sensor 12 at this moment is the true value of the super-pore pressure; if the value of the super pore pressure measured by the super pore pressure sensor 12 is not 0, the super pore pressure sensor 12 generates zero drift and the operation is not normal. At this time, the master control system records the value of the supercavity pressure QUOTE measured by the supercavity pressure sensor 12 at the moment
According to the correction formula QUOTE
Calculating to obtain the true value of the value QUOTE of the super-pore pressure
。
And S5, after the periodic zero drift correction of the observation probe rod is finished, the observation probe rod reaches a state of normal measurement. At this time, the master control system controls the lithium battery pack to energize the electromagnetic coil 32, the electromagnetic coil 32 can generate magnetic force after being energized to attract the iron block 34 to move upwards, so that the first spring 33 is compressed, the push rod 31 is driven to move upwards along the slide rail groove 42 of the bin wall slide rail 30, and the limiting latch 38 on the upper portion of the push rod 31 ejects the cam latch 36 on the lower portion of the cam 29 out of the low latch groove 41 of the slide rail groove 42 of the bin wall slide rail 30. At this time, the master control system controls the lithium battery pack to cut off the power supply to the electromagnetic coil 32, after the power supply to the electromagnetic coil 32 is cut off, the magnetic force disappears, and the cam latch 36 at the lower part of the cam 29 slides to the high latch groove 40 of the slide rail groove 42 of the bin wall slide rail 30 under the pressure action of the second spring 26. The piston 23 moves upward under the driving of the cam 29 to seal the bottom seawater inlet of the in-situ zero drift correction device 17, the bottom seawater inside the probe rod is not communicated with the pore fluid inside the seabed sediment, and the in-situ zero drift correction device 17 is in a normal measurement state at the moment.
Of course, the above description is not limited to the above examples, and the undescribed technical features of the present invention can be implemented by or using the prior art, and will not be described herein again; the above embodiments and drawings are only for illustrating the technical solutions of the present invention and not for limiting the present invention, and the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that changes, modifications, additions or substitutions within the spirit and scope of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and shall also fall within the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a seabed super pore pressure observation probe rod of normal position automatic correction zero drift which characterized in that: comprises a probe rod body and a probe rod pressure-resistant bin arranged at one end of the probe rod body,
a data acquisition instrument, a master control system and a lithium battery for power supply are arranged in the probe rod pressure-resistant bin, a watertight connector and a plug-in sealing cap which are electrically connected with the master control system are arranged at the top of the probe rod pressure-resistant bin in a sealing manner, the bottom of the probe rod pressure-resistant bin is connected with the probe rod body in a sealing manner through an open auxiliary bin, a watertight cable of the data acquisition instrument penetrates through the probe rod pressure-resistant bin and is introduced into the probe rod body through the auxiliary bin, a hydrostatic pressure port penetrating through the auxiliary bin is formed in the outer wall of the auxiliary bin, and a columnar metal permeable stone is connected into the port;
the probe rod body comprises a plurality of hollow probe rod units, two adjacent probe rod units are connected in a sealing manner through connecting pieces, a through bottom layer seawater channel is formed in the connecting pieces in the axis direction of the probe rod units, pore fluid channels which are through the connecting pieces and parallel to the external seawater channels are formed in the connecting pieces, annular metal permeable stones are nested outside the connecting pieces, transverse channels which are used for communicating the pore fluid channels with the metal permeable stones are formed in the connecting pieces respectively, the pore fluid channels are connected with super-pore pressure sensors on the upper end faces of the connecting pieces in a sealing manner, the pore fluid channels are connected with in-situ zero drift correction devices on the lower end faces of the connecting pieces in a sealing manner, and the in-situ zero drift correction devices and the super-pore pressure sensors are electrically connected with watertight cables through watertight connectors;
the in-situ null shift correction device comprises a shell with a cylindrical cavity arranged therein, wherein the top of the shell is provided with a threaded part in threaded connection with a pore fluid channel, a pore fluid water inlet communicated with the cylindrical cavity is formed in the center of the threaded part, a bottom seawater inlet is circumferentially formed in the upper part of the shell of the cylindrical cavity, a limiting plate is fixed below the inner water inlet of the cylindrical cavity, a piston is vertically arranged above the limiting plate in a sliding manner, and an electric control driving mechanism capable of driving the piston to vertically move to block the seawater inlet is arranged below the limiting plate.
2. The in-situ self-correcting null shift subsea superporous pressure observation probe of claim 1, wherein: automatically controlled actuating mechanism includes solenoid and push rod, solenoid fixes in the cylindrical cavity and its control line passes through the watertight cable and is connected with total control system electricity, the push rod sets up in the solenoid top, and the bottom is connected with the spliced pole that passes solenoid, the tip of spliced pole is fixed with the iron plate below solenoid, the spliced pole is equipped with first spring between solenoid and iron plate cover, be provided with in the cylindrical cavity above the push rod with push rod complex cam, the inner wall of cylindrical cavity be provided with can with cam sliding fit and carry out spacing bulkhead slide rail to the cam position, the vertical rotation in axle center department of cam top is connected with the shaft, the shaft upper end runs through the limiting plate and offsets with the piston, epaxial fixed cover of shaft is equipped with the fixed plate, and the shaft overlaps between limiting plate and fixed plate and is equipped with the second spring.
3. The in-situ self-correcting null shift subsea superaperture pressure observation probe of claim 2, wherein: the cam comprises a hollow connecting shaft and four cam latch teeth arranged in the circumferential direction of the connecting shaft, slide rail latch teeth are evenly and convexly arranged on the circumferential direction of the side wall of the push rod, limiting latch teeth are formed on the circumferential direction of the top of the push rod, limiting latch teeth matched with the cam latch teeth are formed on the circumferential direction of the top of the push rod, and slide rail latch teeth corresponding to the limiting latch teeth one to one are convexly arranged on the side wall of the push rod.
4. The in-situ self-correcting null shift subsea superporous pressure observation probe of claim 2, wherein: the bin wall slide rail comprises slide rail clamping teeth and slide rail grooves, the slide rail grooves comprise low clamping grooves allowing the cam clamping teeth to enter and high clamping grooves not allowing the cam clamping teeth to enter, the groove depths of the high clamping grooves and the low clamping grooves are different, and the two grooves are arranged at intervals; the slide rail latch is higher than the cam latch, and the cam latch is higher than the spacing latch.
5. The in-situ self-correcting null shift subsea superporous pressure observation probe of claim 1, wherein: and a hanging ring is further installed at the top of the pressure-resistant bin of the probe rod, and the other end of the probe rod body is connected with the conical tip.
6. An observation method of the sea bottom ultra-pore pressure observation probe for in-situ automatic zero drift correction according to claim 1, characterized in that: the method comprises the following steps:
s1, connecting the watertight connector of the probe rod pressure-resistant bin with an external computer upper computer, waking up a master control system, debugging the working state, working parameters and acquisition frequency of each ultra-pore pressure sensor, setting the correction time period of the in-situ zero drift correction device, switching the in-situ zero drift correction device to be in a zero drift correction state, disconnecting a communication cable, and sealing the watertight connector by using a watertight connector cap;
s2, switching a zero drift correction state to shield the environment super-pore pressure in the process of observing that the probe rod is launched into the sea bottom, and keeping the super-pore pressure value of a super-pore pressure sensor in the probe rod body to be 0 all the time;
s3, standing for 1-2 hours after the penetration of the probe rod is finished, switching to a normal measurement state after the environmental super-pore pressure is dissipated, controlling the bottom seawater in the probe rod and the pore fluid in the bottom sediment to be in a non-communicated state by the master control system, and measuring by the super-pore pressure sensor to obtain a super-pore pressure value not to be 0;
s4, after observing for a period of time, entering a periodic zero drift correction state, after reaching the correction time point, the master control system controls and switches the zero drift correction state,
if the value of the super-pore pressure measured by the super-pore pressure sensor is 0, the super-pore pressure sensor is in a stable state and works normally, and the value of the super-pore pressure measured by the super-pore pressure sensor is the true value of the super-pore pressure;
if the pressure value measured by the super-pore pressure sensor is not 0, the super-pore pressure sensor generates zero drift and works abnormally; at the moment, the master control system records the value of the super-pore pressure measured by the super-pore pressure sensor
According to a correction formula
Calculating to obtain the true value of the super-pore pressure
；
S5, after the periodic zero drift correction is finished, the normal measurement state is reached, at the moment, the master control system controls the bottom seawater in the probe rod and the pore fluid in the bottom sediment to be in a non-communicated state, and the in-situ zero drift correction device is in a normal measurement state.
7. The observation method of the in-situ auto-correcting zero drift seabed super pore pressure observation probe rod according to claim 6, wherein: in step S2, the in-situ zero drift correction device performs a zero drift correction by controlling the lithium battery to energize the electromagnetic coil by the master control system, the electromagnetic coil energizes to generate a magnetic force to attract the iron block to move upward to compress the first spring, thereby driving the push rod to move upward along the slide rail groove of the wall slide rail, the cam latch at the lower part of the cam is ejected out of the high latch groove of the slide rail groove of the wall slide rail by the limit latch at the upper part of the push rod, the lithium battery is controlled by the master control system to deenergize the electromagnetic coil by the lithium battery, the magnetic force disappears after the power failure, the cam latch at the lower part of the cam slides into the low latch groove under the action of the second spring, the piston moves downward under the drive of the cam, the bottom seawater inlet of the in-situ zero drift correction device is opened, and the bottom seawater in the probe rod is communicated with the pore fluid in the bottom sediment, thereby completing the zero drift correction.
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