CN103105333B - In-situ test measuring system for cross-fault buried pipeline - Google Patents
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Abstract
The invention discloses a cross-fault buried pipeline in-situ test measurement system, which comprises: the loading control measuring device (1) is used for controlling the loading dislocation quantity and the horizontal loading state of the vertical movement device (13) and the horizontal movement device (14); the strain measurement device (2) is used for measuring normal and tangential strain reactions of the test pipeline (16); the displacement measuring device (3) is used for observing the displacement reaction of the buried pipeline in the vertical direction and the horizontal direction under the action of the fault on the upper side of the ground surface; the internal pressure measuring device (4) is used for controlling the working pressure of the medium in the test pipeline (16); the host (5) is used for sorting and analyzing the data of the loading control measuring device (1), the strain measuring device (2), the displacement measuring device (3) and the internal pressure control device (4) to obtain a verification result. The novel buried pipeline in-situ test fault reaction and loading control measurement system provided by the invention has the advantages that the test is close to actual, and the analysis result is reliable and effective.
Description
Technical Field
The invention relates to an in-situ test measuring system for a cross-fault buried pipeline, in particular to a test measuring and loading control system for carrying out a buried pipeline fault reaction in an in-situ test site, which is mainly used for observing and monitoring the process and the reaction of the cross-fault buried pipeline in-situ test.
Background
The buried pipeline occupies an important position in modern production and life and is an important city lifeline project. Buried pipeline systems are typical of line and net works, inevitably need to cross some regions with unfavorable earthquake resistance or danger, and crossing faults is one of the key engineering problems that buried pipelines have to face and need to solve. The stress performance and the damage mechanism of the cross-fault buried pipeline need reliable and accurate actual damage data as a research basis, the most reliable and direct method for acquiring the data is actual earthquake observation or test, and the test is the most effective method in actual engineering application. At present, the stress characteristic and the failure mechanism of the buried pipeline crossing the fault are mostly model tests which are carried out in a laboratory when experimental means are adopted for researching the stress characteristic and the failure mechanism. The model test inevitably brings problems of size effect, boundary condition error and the like, and can not well reflect the fault response characteristic of the cross-fault buried pipeline. The in-situ test can better overcome the defects of the model test, but the implementation and control of fault loading in an in-situ field are difficult to realize, and certain difficulties also exist in underground observation and data acquisition of the fault reaction of the pipeline.
Disclosure of Invention
The invention aims at the problems and provides a measuring system for simulating fault reaction of a cross-fault buried pipeline in a fault motion in an in-situ field, which aims to: firstly, accurately and effectively controlling and implementing graded loading conditions of fault in-situ test; secondly, the problem that the fault reaction is difficult to observe in the in-situ test of the cross-fault buried pipeline due to the influence of the covering soil layer is solved.
The invention aims to solve the problems by the following technical scheme:
an in-situ test measurement system for a cross-fault buried pipeline, which is characterized by comprising:
the loading control measuring device is used for controlling the loading dislocation quantity and the horizontal loading state of the vertical movement device and the horizontal movement device, and correspondingly outputting measuring data to the host after measurement;
the strain measuring device is used for measuring normal and tangential strain reactions of the test pipeline and correspondingly outputting measured data to the host after measurement;
the displacement measuring device is used for observing the displacement reaction of the buried pipeline in the vertical direction and the horizontal direction under the action of the fault on the upper side of the earth surface, and correspondingly outputting measuring data to the host after measuring;
the internal pressure measuring device is used for controlling the working pressure of the medium in the test pipeline and correspondingly outputting measured data to the host after measurement;
and the host is used for sorting and analyzing the data transmitted by the loading control measuring device, the strain measuring device, the displacement measuring device and the internal pressure control device to obtain a verification result.
The test pipeline is formed by connecting by a hot melting method.
The loading control measuring device comprises a vertical loading control device, a horizontal loading control device and a data acquisition device, wherein the vertical loading dislocation component and the pressure state of the vertical loading control device and the horizontal loading dislocation component and the pressure state of the horizontal loading control device are output to a host through the data acquisition device.
The vertical loading control device comprises a vertical loading displacement meter and a vertical loading pressure sensor, the vertical loading displacement meter is arranged outside the bottom end part of the vertical movement device, and the vertical loading pressure sensor is arranged at the position of a loading point of the vertical movement device; the horizontal loading control device comprises a horizontal loading displacement meter and a horizontal loading soil pressure box, the horizontal loading displacement meter is arranged on the outer side of the horizontal movement device, and the horizontal loading soil pressure box is positioned on the inner side of the horizontal movement device and positioned on the upper side and the lower side of the test pipeline; the vertical motion device and the horizontal motion device are positioned in the reaction device, and the horizontal motion device is placed on the upper side of the bottom plate of the vertical motion device.
The data acquisition device comprises an artificial data acquisition instrument, an automatic data acquisition and analysis system and a special soil pressure data acquisition instrument, wherein the artificial data acquisition instrument is connected with a vertical loading displacement meter in a vertical loading control device through a data line, the automatic data acquisition and analysis system is connected with a vertical loading pressure sensor in the vertical loading control device and a horizontal loading displacement meter in the horizontal loading control device through the data line, and the special soil pressure data acquisition instrument is connected with a horizontal loading soil pressure box in the horizontal loading control device through the data line.
The strain measurement device comprises a resistance strain gauge and an automatic data acquisition static acquisition instrument, and real-time data of the resistance strain gauge is acquired by the automatic data acquisition static acquisition instrument and then is transmitted to the host.
The displacement measuring device comprises a displacement indicating mechanism and displacement measuring equipment, wherein the displacement indicating mechanism comprises a hoop, a displacement indicating needle and a connecting bolt; the displacement measuring equipment comprises a theodolite and a level, wherein the theodolite and the level respectively convey a displacement indicating needle to the host after the displacement reaction of the displacement indicating needle in the vertical direction and the horizontal direction is recorded.
And a protective sleeve is arranged on the outer side of the displacement indicating needle.
The internal pressure measuring device comprises a pipe pressure observer, and the pipe pressure observer is arranged at a medium inlet of the test pipeline.
Compared with the prior art, the invention has the following advantages:
the invention provides a set of novel buried pipeline in-situ test fault reaction measuring system and a loading control measuring system based on a cross-fault buried pipeline in-situ test, the loading control measuring system can accurately and effectively realize the loading dislocation quantity of each stage specified by the test design and ensure that a loading motion device does not horizontally move obliquely, and the measuring system can truly and accurately observe and control the fault reaction of the in-situ test pipeline; the measuring system considers the influence of actual existing factors such as the working state of a test pipeline, a test pipeline joint and the like, controls the working state of the pipeline to be closer to the actual stress state of the test pipeline, has more reliable and effective observation and analysis results, and can be widely applied to test measurement of the fault reaction stress performance and the failure mechanism of the buried pipeline.
Drawings
FIG. 1 is a schematic diagram of a measurement system according to the present invention;
FIG. 2 is a schematic structural diagram of a test apparatus used in the present invention;
FIG. 3 is a schematic diagram of the present invention showing the strain measurement of a test line;
FIG. 4 is a schematic cross-sectional view of a test line resistance strain gage arrangement of the present invention;
FIG. 5 is a schematic diagram of the layout of the test pipeline displacement measurement system of the present invention;
FIG. 6 is a schematic structural view of a test line displacement indicating mechanism of the present invention;
FIG. 7 is a schematic view of the arrangement of the test line internal pressure measuring device according to the present invention;
FIG. 8 is a schematic view of a loading control measurement apparatus according to the present invention;
FIG. 9 is a second schematic view of the arrangement of the loading control measuring device of the present invention.
Wherein: 1-a loading control measuring device; 2-strain measuring device; 3-displacement measuring device; 4-internal pressure measuring device; 5, a host; 6-vertical loading control device; 7-horizontal loading control device; 8-a data acquisition device; 9-vertical loading displacement meter; 10-vertical loading pressure sensor; 11-horizontal loading displacement meter; 12-horizontal loading earth pressure cell; 13-vertical motion means; 14-horizontal motion device; 15-a counterforce device; 16-test line; 17-an artificial data acquisition instrument; 18-automatic data acquisition and analysis system; 19-a soil pressure special data acquisition instrument; 20-resistance strain gauge; 21, automatically acquiring data by using a static acquisition instrument; 22-displacement indicating means; 23-displacement measuring equipment; 24-a ferrule; 25-displacement indicating needle; 26-connecting bolts; 27-theodolite; 28-level gauge; 29-protective sleeve; 30-tube pressure viewer.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1-9: a cross-fault buried pipeline in-situ test measurement system, the measurement system comprising: a loading control measuring device 1 for controlling the loading dislocation amount and the horizontal loading state of the vertical movement device 13 and the horizontal movement device 14, and correspondingly outputting the measured data to the host computer 5 after the measurement; the strain measuring device 2 is used for measuring normal and tangential strain reactions of the test pipeline 16 and correspondingly outputting measured data to the host 5 after measurement; the displacement measuring device 3 is used for observing the displacement reaction of the buried pipeline in the vertical direction and the horizontal direction under the action of the fault on the upper side of the earth surface, and correspondingly outputting measuring data to the host 5 after measuring; the internal pressure measuring device 4 is used for controlling the working pressure of the medium in the test pipeline 16 and correspondingly outputting measured data to the host 5 after measurement; and the host 5 is used for sorting and analyzing the data transmitted by the loading control measuring device 1, the strain measuring device 2, the displacement measuring device 3 and the internal pressure control device 4 to obtain a verification result.
The loading control measuring device 1 comprises a vertical loading control device 6, a horizontal loading control device 7 and a data acquisition device 8, wherein the vertical loading dislocation component and the pressure state of the vertical loading control device 6, the horizontal loading dislocation component and the pressure state of the horizontal loading control device 7 are output to a host 5 through the data acquisition device 8. The vertical loading control device 6 comprises a vertical loading displacement meter 9 and a vertical loading pressure sensor 10, the vertical loading displacement meter 9 is arranged outside the bottom end part of the vertical movement device 13 and used for controlling the vertical component of each stage of loading dislocation of the in-situ test fault, the vertical loading pressure sensor 10 is arranged at the loading point position of the vertical movement device 13, each loading point is correspondingly provided with one vertical loading pressure sensor 10, and the non-inclined horizontal loading of the vertical movement device 13 is realized by controlling the same loading step increment of each vertical loading pressure sensor 10 in the test; the horizontal loading control device 7 comprises a horizontal loading displacement meter 11 and horizontal loading soil pressure boxes 12, the horizontal loading displacement meter 11 is arranged on the outer side of the horizontal movement device 14 and used for controlling the horizontal component of each stage of loading dislocation of the in-situ test fault, and the 2 horizontal loading soil pressure boxes 12 are all positioned on the inner side of the horizontal movement device 14 and symmetrically arranged on the upper side and the lower side of the test pipeline 16; the horizontal movement device 14 mainly provides a horizontal movement component of an artificial fault in an in-situ simulation test, the vertical movement device 13 mainly provides a vertical movement component of the artificial fault in the in-situ simulation test, the vertical movement device 13 and the horizontal movement device 14 are positioned in the counterforce device 15, the horizontal movement device 14 is placed on the upper side of the bottom plate of the vertical movement device 13, the counterforce device 15 is mainly a counterforce pedestal for the in-situ test of fault loading, and the whole pouring forming of a reinforced concrete structure is adopted on the in-situ test site. In addition, the data acquisition device 8 comprises an artificial data acquisition instrument 17, an automatic data acquisition and analysis system 18 and a special soil pressure data acquisition instrument 19, wherein the automatic data acquisition and analysis system 18 adopts a quarter-bridge automatic data acquisition and analysis system, the artificial data acquisition instrument 17 is connected with the vertical loading displacement meter 9 in the vertical loading control device 6 through a data line, the automatic data acquisition and analysis system 18 is respectively connected with the vertical loading pressure sensor 10 in the vertical loading control device 6 and the horizontal loading displacement meter 11 in the horizontal loading control device 7 through a data line, and the special soil pressure data acquisition instrument 19 is connected with the horizontal loading soil pressure box 12 in the horizontal loading control device 7 through a data line.
The strain measuring device 2 comprises a resistance strain gauge 20 and a data automatic acquisition static acquisition instrument 21, real-time data of the resistance strain gauge 20 is acquired by the data automatic acquisition static acquisition instrument 21 and then is conveyed to the host 5, the resistance strain gauge 20 is pasted at a corresponding position of a test pipeline 16 formed by connecting by a hot melting method according to test design during installation and is detected, the resistance strain gauge 20 is respectively connected with a data line after detection is complete, and a protection device is arranged on the periphery of the resistance strain gauge 20 to prevent moisture and prevent collision.
The displacement measuring device 3 comprises a displacement indicating mechanism 22 and a displacement measuring device 23, wherein the displacement indicating mechanism 22 comprises a hoop 24, a displacement indicating needle 25 and a connecting bolt 26, the lower end of the displacement indicating needle 25 arranged vertically upwards is fixed on the hoop 24, the hoop 24 is fixed on the test pipeline 16 through the connecting bolt 26, the hoop 24 of the displacement indicating mechanism 22 is arranged near the resistance strain gauge 20 and is closely attached to the position of a protection device of the resistance strain gauge 20, a PVC protection sleeve 29 with a certain diameter is arranged outside the displacement indicating needle 25 to avoid the deformation of the displacement indicating needle 25 caused by soil mass extrusion in the loading process, the radius of the protection sleeve 29 is not less than the horizontal dislocation quantity of a fault, the end of the displacement indicating needle 25 protrudes out of the ground surface of a site of a home position test, the displacement indicating needle 25 protruding out of the ground surface is observed by using the displacement indicating mechanism 23, namely a theodolite 27 and a level instrument 28 in the test to express the fault, namely, the theodolite 27 and the level 28 respectively record the displacement response of the displacement indicator 25 in the vertical direction and the horizontal direction and then transmit the recorded displacement response to the host 5.
The internal pressure measuring device 4 comprises a pipe pressure observer 30, a medium inlet of the test pipeline 16 is located at the far end of the test pipeline 16 and is communicated with a medium source of the in-situ test site, a medium outlet of the test pipeline 16 is located at the loading end of the test pipeline 16 and is connected to the outer side of the test site through a pipeline, the pipe pressure observer 30 is arranged at the medium inlet of the test pipeline 16 and is used for controlling the working pressure of the in-situ test buried pipeline, and a control valve is arranged at the medium outlet of the test pipeline 16.
Example 1
The test site selected in this embodiment is in Nanjing, and the test measurement system is verified by simulating the urban water supply network in Nanjing. The specific steps of the test are as follows:
a. selecting a test field, pouring a counterforce device 15, erecting a vertical movement device 13 and a horizontal movement device 14 in the counterforce device 15, and simultaneously placing a vertical loading displacement meter 9 and a horizontal loading displacement meter 10 at positions set by test design in the vertical movement device 13 and the horizontal movement device 14;
b. the test pipeline 16 is made of HDPE pipes commonly used in city water supply in Nanjing, the HDPE pipes are connected with the test pipeline 16 through an electric hot melting connection method, then the resistance strain gauges 20 and the displacement indicating mechanisms 22 are arranged on the test pipeline 16 in a staggered mode according to test design arrangement requirements, four measuring points are arranged on each strain measuring section of the test pipeline 16, namely four resistance strain gauges 20 are attached to each strain measuring section, a protection device is arranged on the outer side of each resistance strain gauge 20 to carry out damp-proof and anti-collision wrapping treatment on the resistance strain gauge 20, the distance between the arrangement sections of the resistance strain gauges 20 in the length direction of the test pipeline is 500mm near a soil body fracture zone caused by a fault in consideration of the actual stress condition of the test pipeline under the action of the fault, the distance between the arrangement sections of the resistance strain gauges 20 in the length direction of the test pipeline is increased to 1000mm far away from the fault zone, and the initial stress effect, the distance between the arrangement sections of the resistance strain gauges 20 on the left side and the right side of the hot melting joint is 500mm, in addition, the pipeline displacement indicating needle 25 is vertically arranged upwards, a PVC protective sleeve 29 with the diameter of 100mm and the length of 1000mm is arranged on the outer side of the pipeline displacement indicating needle 25 to prevent the pointer from being extruded by the surrounding soil body to generate deformation, and the pipeline displacement indicating needle 25 is positioned at the circle center position of the PVC protective sleeve 29 in the test;
c. the resistance strain gauge 20 is respectively connected to a 60 interface and two data automatic acquisition static strain gauges 21 of 20 interfaces through data lines, the vertical loading displacement meter 9 is connected to an artificial data acquisition instrument 17 through data lines, the vertical loading pressure sensor 10 and the horizontal loading displacement meter 11 are connected to a quarter-bridge data automatic acquisition and analysis system 18 through data lines, and the horizontal loading soil pressure box 12 is connected to a soil pressure special data acquisition instrument 19 through data lines;
d. excavating a pipe trench according to the construction specification of HDPE pipes for water supply in Nanjing, excavating the pipe trench by adopting a manual straight arm, taking the distance from the trench bottom to the ground surface as 1200mm, sealing two end parts of a test pipeline 16 by adopting steel flanges, connecting an outlet pipe and an inlet pipe externally, arranging a pipe pressure observation instrument 30 at the water inlet position of the test pipeline 16 for observing the change of water pressure in the test pipeline 16 in the test at any time, arranging a valve at the water inlet and outlet of the test pipeline 16 for controlling the internal pressure of the pipeline, and hoisting the test pipeline 16 in place on site after backfilling the trench bottom flatly, wherein one end of the test pipeline 16 is provided with a loading end part constraint condition which is used as the test pipeline 16 on a horizontal movement device 14;
e. backfilling and tamping the backfill soil on the upper part of the test pipeline 16 in layers, stabilizing the position of the protective sleeve 29 in the backfilling process to enable the displacement indicator needle 25 to be located at the circle center position of the protective sleeve 29 as much as possible, and simultaneously requiring the compaction rate of the backfill soil to be not less than 80%, and measuring the plane coordinates and the vertical elevation of the displacement indicator needle 25 extending out of the ground surface by adopting a method of combining a theodolite 27 and a leveling instrument 28 to describe the fault displacement reaction of the buried pipeline;
f. debugging the instrument and the loading system, opening a valve at a water inlet pipe to inject water into the test pipeline 16 to check whether the instrument and the equipment can normally operate, and observing the internal pressure of the pipeline in real time through a pipeline observer 30, wherein the water supply pressure of the in-situ test HDPE is the standard water pressure of domestic water put into a construction site;
g. the method comprises the steps of carrying out formal loading after normal inspection, carrying out a test process in a displacement control mode, carrying out loading in 8 stages in total, wherein the loading step is shown in table 1, the fault loading dislocation control takes vertical loading displacement as a main control condition of the test, simultaneously, loading at each stage is completed in a mode of firstly applying fault horizontal dislocation and then applying vertical dislocation, test data are collected after each stage of loading is completed for 2 minutes, the horizontal displacement and the vertical displacement of a position indicator 25 on a test pipeline 16 after each stage of loading are measured by a theodolite 27 and a level 28 and then calculated by a difference method, loading is stopped after the fault limit dislocation amount of the test design is reached, data collection is completed, and finally, the collected data are sorted and analyzed to obtain a verification result. Verification results show that the testing method successfully performs test research on the trans-fault urban water supply HDPE pipeline in a service state and performs test verification on the stress performance and the failure mechanism of the trans-fault buried pipeline.
Table 1 loading procedure for a water supply pipe cross-fault buried pipeline test in Nanjing.
According to the invention, a test field is selected, a counterforce device 15 is poured, the vertical movement device 13 and the horizontal movement device 14 are arranged as boundary conditions of the fault earthquake-generating bedrock and the soil body far end, so that the vertical dislocation component and the horizontal dislocation classification quantity of the artificial fault are realized, and the artificial fault has the characteristics of no pre-breaking seam, no soil body boundary and real fracture; the invention considers the influence of actual existing factors such as the joint and the load state of the test pipeline 16, is closer to the actual stress state of the test pipeline 16, and has more reliable and effective analysis result; the method measures the fault reaction of the in-situ test pipeline by using the strain measuring device 2 and the displacement measuring device 3 of the buried pipeline, realizes a means for measuring and observing the fault reaction of the buried pipeline through the ground, observes the internal pressure of the test pipeline 16 in the in-situ test through the pipeline working internal pressure measuring device 4, and considers that the actual working state of the test pipeline 16 is closer to the stress state of the actual pipeline; the in-situ test loading control measuring device 1 is used for measuring and controlling the test loading process, so that the loading process detection and control of the in-situ test are realized.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical scheme according to the technical idea proposed by the present invention falls within the protection scope of the present invention; the technology not related to the invention can be realized by the prior art.
Claims (6)
1. An in-situ test measurement system for a cross-fault buried pipeline, which is characterized by comprising:
a load control measuring device (1) for controlling the load dislocation amount and the horizontal load state of the vertical motion device (13) and the horizontal motion device (14), and correspondingly outputting the measured data to the host (5) after measurement;
the strain measurement device (2) is used for measuring normal and tangential strain reactions of the test pipeline (16) and correspondingly outputting measurement data to the host (5) after measurement;
the displacement measuring device (3) is used for observing the displacement reaction of the buried pipeline in the vertical direction and the horizontal direction under the action of the fault on the upper side of the earth surface, and correspondingly outputting measuring data to the host (5) after measurement;
the internal pressure measuring device (4) is used for controlling the working pressure of the medium in the test pipeline (16) and correspondingly outputting measuring data to the host (5) after measurement;
the host (5) is used for sorting and analyzing the data transmitted by the loading control measuring device (1), the strain measuring device (2), the displacement measuring device (3) and the internal pressure control device (4) to obtain a verification result;
the loading control measuring device (1) comprises a vertical loading control device (6), a horizontal loading control device (7) and a data acquisition device (8), wherein the vertical loading dislocation component and the pressure state of the vertical loading control device (6) and the horizontal loading dislocation component and the pressure state of the horizontal loading control device (7) are output to a host (5) through the data acquisition device (8); the vertical loading control device (6) comprises a vertical loading displacement meter (9) and a vertical loading pressure sensor (10), wherein the vertical loading displacement meter (9) is arranged outside the bottom end part of the vertical movement device (13), and the vertical loading pressure sensor (10) is arranged at the position of a loading point of the vertical movement device (13); the horizontal loading control device (7) comprises a horizontal loading displacement meter (11) and a horizontal loading soil pressure box (12), the horizontal loading displacement meter (11) is arranged on the outer side of the horizontal movement device (14), and the horizontal loading soil pressure box (12) is positioned on the inner side of the horizontal movement device (14) and positioned on the upper side and the lower side of the test pipeline (16); the vertical movement device (13) and the horizontal movement device (14) are positioned in the reaction force device (15), and the horizontal movement device (14) is placed on the upper side of the bottom plate of the vertical movement device (13); wherein,
the data acquisition device (8) comprises an artificial data acquisition instrument (17), an automatic data acquisition and analysis system (18) and a special soil pressure data acquisition instrument (19), wherein the artificial data acquisition instrument (17) is connected with a vertical loading displacement meter (9) in a vertical loading control device (6) through a data line, the automatic data acquisition and analysis system (18) is respectively connected with a vertical loading pressure sensor (10) in the vertical loading control device (6) and a horizontal loading displacement meter (11) in a horizontal loading control device (7) through the data line, and the special soil pressure data acquisition instrument (19) is connected with a horizontal loading soil pressure box (12) in the horizontal loading control device (7) through the data line.
2. The in-situ test measurement system of a cross-fault buried pipeline according to claim 1, characterized in that the test pipeline (16) is formed by connecting through a hot melting method.
3. The in-situ test measurement system of the cross-fault buried pipeline according to claim 1, characterized in that the strain measurement device (2) comprises a resistance strain gauge (20) and an automatic data acquisition static acquisition instrument (21), and real-time data of the resistance strain gauge (20) is acquired by the automatic data acquisition static acquisition instrument (21) and then is transmitted to the host (5).
4. The in-situ test measurement system for the cross-fault buried pipeline according to claim 1, wherein the displacement measurement device (3) comprises a displacement indication mechanism (22) and a displacement measurement device (23), the displacement indication mechanism (22) comprises a hoop (24), a displacement indication needle (25) and a connecting bolt (26), the lower end of the displacement indication needle (25) arranged vertically upwards is fixed on the hoop (24), and the hoop (24) is fixed on the test pipeline (16) through the connecting bolt (26); displacement amount equipment (23) include theodolite (27) and spirit level (28), theodolite (27) and spirit level (28) carry displacement indicator (25) to host computer (5) after vertical and horizontal direction's displacement reaction record respectively.
5. The in-situ test measurement system of a cross-fault buried pipeline according to claim 4, characterized in that a protective sleeve (29) is arranged on the outer side of the displacement indicator needle (25).
6. The in-situ test and measurement system of a cross-fault buried pipeline according to claim 1, characterized in that the internal pressure measurement device (4) comprises a pipe pressure observer (30), and the pipe pressure observer (30) is arranged at a medium inlet of the test pipeline (16).
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