CN114487344B - Real-time judgment method for improved state of muck on horizontal conveyor belt of shield tunneling machine - Google Patents
Real-time judgment method for improved state of muck on horizontal conveyor belt of shield tunneling machine Download PDFInfo
- Publication number
- CN114487344B CN114487344B CN202111657190.0A CN202111657190A CN114487344B CN 114487344 B CN114487344 B CN 114487344B CN 202111657190 A CN202111657190 A CN 202111657190A CN 114487344 B CN114487344 B CN 114487344B
- Authority
- CN
- China
- Prior art keywords
- muck
- conveyor belt
- shield tunneling
- tunneling machine
- horizontal conveyor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Remote Sensing (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a real-time judgment method for the improved state of muck on a horizontal conveyor belt of a shield tunneling machine, which comprises the following steps: performing slump tests and accumulation experiments on the differently improved mucks by using the on-site mucks and the modifying agent as experimental materials to obtain the stationary state secant angle value range of the mucks in a proper improvement state; scanning the muck on a horizontal conveyor belt of the on-site shield tunneling machine through a three-dimensional laser scanner to obtain point cloud data of the muck surface, establishing a muck surface curve on the horizontal conveyor belt of the shield tunneling machine, and determining a secant angle of the muck on the horizontal conveyor belt of the shield tunneling machine; and judging the improvement state of the muck on the horizontal conveyor belt of the shield tunneling machine in real time according to the secant angle theta of the muck on the horizontal conveyor belt of the shield tunneling machine and the secant angle range of the muck in the static state under the appropriate improvement state. The invention can reduce the consumption of manpower and financial resources caused by the need of measuring the muck slump in the shield tunneling process and avoid the hysteresis for judging the improved state of the muck.
Description
Technical Field
The invention belongs to the technical field of shield tunnel construction, and particularly relates to a method for judging the improved state of muck on a horizontal conveyor belt of a shield machine in real time based on a three-dimensional laser scanning technology.
Background
In the shield tunnel construction process, shield muck reaches a proper improvement state, which is an important guarantee for shield safe and efficient tunneling. Improper improvement of the muck is likely to cause the following hazards: when the improved muck is too thin and has strong fluidity, the spiral conveyor is easy to gush, so that the pressure of the soil bin suddenly changes, the pressure of the tunnel face cannot be supported, large settlement occurs, and the front of the shield can be seriously collapsed in a severe time; when the improved dregs are poor in mobility, the dregs are not beneficial to removal, the dregs with strong adhesion are easy to stick on the cutter head, and the abrasion of the cutter head is increased.
At present, an indoor slump test is mainly adopted for judging the improvement condition of the muck on the conveying belt, the improvement condition of the muck is judged by measuring the slump value, relevant personnel are required to take off the muck on the conveying belt of the shield tunneling machine to perform the slump test, and certain hysteresis exists in the determination of the muck on the conveying belt.
Disclosure of Invention
The invention provides a method for real-time determination of improved state of muck on a horizontal conveyor belt of a shield tunneling machine based on a three-dimensional laser scanning technology, which can reduce the consumption of manpower and financial resources caused by the need of measuring the slump of the muck in the shield tunneling process and avoid the hysteresis quality of the improved state of the muck.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a real-time judgment method for the improved state of the muck on a horizontal conveyor belt of a shield tunneling machine comprises the following steps:
step 1, using on-site muck and modifying agent as experimental materials, performing slump tests on the muck after different modifications, evaluating whether the modified state of each muck is proper or not according to the slump value, and performing accumulation tests on the muck in each proper modified state, namely simulating the muck to fall from the height of a shield screw machine from a shield machine conveyor belt so as to obtain the stationary state secant angle value range [ w ] of the muck in a proper modified state min ,w max ]；
Step 2, scanning the muck on the horizontal conveyor belt of the on-site shield tunneling machine through a three-dimensional laser scanner, wherein the scanning direction is vertical to the moving direction of the conveyor belt; the method comprises the steps of obtaining point cloud data of the surface of the muck through each scanning, correspondingly establishing a muck surface curve on a horizontal conveyor belt of the shield tunneling machine, and determining a secant angle theta of the muck on the horizontal conveyor belt of the shield tunneling machine in a direction perpendicular to the movement direction of the conveyor belt according to the muck surface curve;
step 3, according to the secant angle theta of the muck on the horizontal conveyor belt of the shield tunneling machine and the secant angle value range [ w ] of the muck in the static state under the appropriate improvement state min ,w max ]And judging the improved state of the muck on the horizontal conveying belt of the shield tunneling machine in real time.
Further, the judging method in step 3 is as follows:
if λ θ ∈ [ w ] min ,w max ]Judging that the improved state of the muck on the horizontal conveyor belt of the shield machine is proper; wherein, λ is the angle transformation coefficient of the static and dynamic secant;
if λ θ > w max If the flowability of the muck on the horizontal conveyor belt of the shield machine is poor, adjusting the water injection amount and the foam injection ratio to increase the flowability of the muck;
if λ θ < w min If the flowability of the slag soil on the horizontal conveyor belt of the shield tunneling machine is too strong or the slag soil is too loose, the water injection amount and the foam injection ratio need to be adjusted, so that the flowability of the slag soil is reduced.
Furthermore, the transformation coefficient lambda of the static and dynamic secant angles is obtained by measuring the ratio of the angle of the muck secant line to the angle of the muck secant line on the horizontal conveyor belt of the shield tunneling machine through muck under the same improved state in an indoor experiment.
Further, a three-dimensional laser scanner is adopted to emit linear laser, point cloud data of the surface of the slag soil is obtained by sending and receiving laser pulses, the point cloud data is subjected to denoising processing by utilizing programming or existing point cloud data processing software, then three-dimensional model reconstruction is carried out on the surface of the slag soil, then a curve of the surface of the slag soil perpendicular to the moving direction of the conveyor belt is obtained, and then a secant angle is determined according to the curve of the surface of the slag soil.
Further, the three-dimensional laser scanner transmits the scanned point cloud data in real time through an Ethernet or USB interface.
Further, the method for determining the secant angle comprises the following steps:
(1) Establishing a coordinate system by taking the direction of muck accumulation on the conveyor belt as a z-axis, the direction of movement of the conveyor belt as a y-axis and the direction vertical to a yOz plane as an x-axis;
(2) All point cloud data obtained by scanning the surface of the muck along the x-axis direction by using the three-dimensional laser scanner are represented by using the established coordinate system, and then a muck surface curve f is fitted 1 (x,y,z)；
(3) Calculating the surface curve f of the dregs 1 (x, y, z), two points A having the largest z-axis value 1 (x 1 ,y 1 ,z 1 )、A 2 (x 2 ,y 2 ,z 2 ) And two points B with minimum z-axis value 1 (x 3 ,y 3 ,z 3 )、B 2 (x 4 ,y 4 ,z 4 ) (ii) a Wherein x is 1 ≤x 2 ，x 3 ＜x 4 ；
(4) According to four points A 1 ,A 2 ,B 1 ,B 2 Calculating the secant angle theta of the muck on the horizontal conveyor belt of the shield tunneling machine according to the following formula:
compared with the prior art, the invention has the following advantages:
1. the accuracy of the residue soil state judgment on the horizontal conveying belt of the shield tunneling machine is improved. In the prior art, the condition of improving the muck on the horizontal conveying belt of the shield tunneling machine is judged by basically taking the muck on site, and slump tests are carried out, so that the results have certain errors due to different operation steps and operation modes of tests carried out by different people; meanwhile, an error is generated in the reading of the slump value, and a certain influence is generated on the judgment result. The method and the device perform non-contact measurement on the surface of the muck through the three-dimensional laser scanner technology, perform three-dimensional model reconstruction on the surface of the muck according to the point cloud data of the obtained surface of the muck, and judge the state of the muck through computer calculation, so that the judgment result is more accurate.
2. According to the method, the improved muck state on the horizontal conveying belt of the shield machine is judged by researching the muck accumulation state after field improvement and calculating the moving muck secant angle theta on the horizontal conveying belt of the shield machine, so that the complexity and the time consumption of field soil sampling tests are avoided.
3. The three-dimensional laser scanning technology is adopted to judge the improved state of the muck on the horizontal conveying belt of the shield tunneling machine, so that the configuration of field manpower is favorably reduced, the loss of the field manpower and material resources is reduced, the development of shield construction towards less humanization and intelligentization is favorably promoted, and the personal safety of constructors is practically ensured.
4. Adopt three-dimensional laser scanning technique to judge the muck improvement state on the shield constructs quick-witted horizontal conveyor belt, handle the powerful calculation function of make full use of computer through the computer to data, the more quick judgement muck improvement state directly provides reference for shield driver's next step operation, embodies more and controls in the work progress, is favorable to increasing its ageing.
Drawings
FIG. 1 is a flow chart of a method according to an embodiment of the present invention;
FIG. 2 is a secant angle definition diagram of a muck dump;
fig. 3 is a profile line diagram of a cross section of muck on a horizontal conveyor belt of a shield tunneling machine in a coordinate system according to an embodiment of the invention.
Detailed Description
The following describes embodiments of the present invention in detail, which are developed based on the technical solutions of the present invention, and give detailed implementation manners and specific operation procedures to further explain the technical solutions of the present invention.
Referring to fig. 1 to 3, a method for real-time determination of an improved state of muck on a horizontal conveyor belt of a shield tunneling machine based on a three-dimensional laser scanning technology includes the following steps:
step 1, using on-site muck and modifier as experimental materials, performing slump test and accumulation test on muck in different improvement states, and obtaining a stationary state secant angle value range [ w ] of muck in a proper improvement state min ,w max ]。
The on-site muck and the modifier are used as experimental materials to perform slump tests on the muck in different modification states, and the modification state of the muck is judged according to the slump value and the surface of the muckThe improved muck is dropped from the height H by imitating the distance from a shield screw machine to a shield machine conveyor belt, and the secant angle of the muck in the stationary state of the muck accumulation is measured, so that the stationary state secant angle range [ w ] of the muck in the appropriate improved state is obtained min ,w max ]Therefore, the method is used as a judgment basis for the improvement state of the muck on the horizontal conveying belt of the shield tunneling machine.
In a specific experimental example, the height H is set to 1 meter, and the slump is determined to be [15cm,20cm ] according to the slump and the characteristics of the surface of the slag soil, so that the improvement is suitable, and the secant angle in the static state is in the range of [19.6 degrees, 28 degrees ].
The secant angle in the static state of the muck pile in the step is the same as the secant angle determination method in the subsequent step 2, namely: and taking the average value of the cutting line angles of the residue soil at two ends of the same section on the residue soil section perpendicular to the moving direction of the conveyor belt, and taking the values of the cutting line angles.
Step 2, scanning the muck on the horizontal conveyor belt of the on-site shield tunneling machine through a three-dimensional laser scanner, wherein the scanning direction is vertical to the moving direction of the conveyor belt; the method comprises the steps of obtaining point cloud data of the surface of the muck through scanning each time, correspondingly establishing a muck surface curve on a horizontal conveyor belt of the shield tunneling machine, and determining a secant angle theta of the muck on the horizontal conveyor belt of the shield tunneling machine in a direction perpendicular to the movement direction of the conveyor belt according to the muck surface curve (the average value of the cutting line angles of the muck at two ends under the same section is taken and the value of the following secant angle is taken);
the method comprises the steps of adopting a three-dimensional laser scanner to emit linear laser, obtaining point cloud data of the surface of the muck by sending and receiving laser pulses, and then sending the point cloud data which are transmitted and scanned in real time to a computer end through an Ethernet or a USB interface for further processing.
After the computer receives the original point cloud data from the three-dimensional laser scanner, the noise sources include: the three-dimensional laser scanner shakes along with the vibration of the shield machine conveyor belt, laser rays emitted by the three-dimensional laser scanner are irradiated on the water surface to be scattered, the three-dimensional laser scanner is dark in working environment, noise points generated by dust and the like, and therefore the method firstly utilizes programming or existing point cloud data processing software to perform denoising processing on point cloud data;
and then, reading the processed point cloud data by utilizing python or other related programming software, further performing three-dimensional model reconstruction on the surface of the residue soil, acquiring a residue soil surface curve vertical to the movement direction of the conveyor belt, and further determining a secant angle according to the residue soil surface curve. The method for determining the secant angle comprises the following steps:
(1) Establishing a coordinate system by taking the direction of muck accumulation on the conveyor belt as a z-axis, the direction of movement of the conveyor belt as a y-axis and the direction vertical to a yOz plane as an x-axis;
(2) All point cloud data obtained by scanning the surface of the muck along the x-axis direction by using the three-dimensional laser scanner are represented by using the established coordinate system, and then a muck surface curve f is fitted 1 (x,y,z)；
(3) Calculating the surface curve f of the dregs 1 (x, y, z), two points A having the largest z-axis value 1 (x 1 ,y 1 ,z 1 )、A 2 (x 2 ,y 2 ,z 2 ) And two points B with minimum z-axis value 1 (x 3 ,y 3 ,z 3 )、B 2 (x 4 ,y 4 ,z 4 ) (ii) a Wherein x is 1 ≤x 2 ，x 3 ＜x 4 If x 1 ＝x 2 Then point A 1 ,A 2 The same point;
(4) According to four points A 1 ,A 2 ,B 1 ,B 2 Calculating the secant angle theta of the muck on the horizontal conveyor belt of the shield tunneling machine according to the following formula:
step 3, according to the secant angle theta of the muck on the horizontal conveyor belt of the shield tunneling machine and the secant angle value range [ w ] of the muck in the static state under the appropriate improvement state min ,w max ]And judging the improved state of the muck on the horizontal conveying belt of the shield tunneling machine in real time.
If λ θ∈[w min ,w max ]Judging that the improvement state of the muck on the horizontal conveyor belt of the shield machine is proper, recording as a working condition I, and keeping the current improvement parameters of the muck to continue tunneling;
the lambda in the invention is a static and dynamic secant angle transformation coefficient, and is obtained by measuring the ratio of the muck secant angle to the muck secant angle on the horizontal conveying belt of the shield tunneling machine through muck under the same improved state in an indoor experiment. In this experimental example, the angle transformation coefficient λ of the static and dynamic secant of sandy soil was 2.
If λ θ > w max And the accumulation angle of the muck under the current condition can be reflected to a certain extent, which indicates that the fluidity of the muck on the horizontal conveyor belt of the shield tunneling machine is poor and is marked as working condition two. At the moment, the water injection amount and the foam injection ratio need to be adjusted to increase the flowability of the slag soil, and the slag soil is continuously monitored and adjusted until the secant angle theta of the slag soil on the horizontal conveyor belt of the shield tunneling machine meets lambda theta epsilon (w is the element of w min ,w max ) And then continuing tunneling.
If λ θ < w min And if the accumulation angle of the muck under the current condition is smaller, the fact that the fluidity of the muck is too strong or the muck is too loose under the current condition is indicated, and the result is recorded as working condition three. At the moment, the water injection amount and the foam injection ratio need to be adjusted, the flowability of the slag soil is reduced to meet the requirement, the slag soil after being adjusted and improved is continuously monitored until the secant angle lambda theta of the slag soil reaches the secant angle interval [ w theta ] of the slag soil under the appropriate improved state min ,w max ]And when the appropriate improvement state is achieved, keeping the corresponding improvement parameters to continue tunneling.
The above embodiments are preferred embodiments of the present application, and those skilled in the art can make various changes or modifications without departing from the general concept of the present application, and such changes or modifications should fall within the scope of the claims of the present application.
Claims (4)
1. A real-time judgment method for improved state of muck on a horizontal conveyor belt of a shield tunneling machine is characterized by comprising the following steps:
step 1, utilizing on-site muck and modifying agentPerforming slump tests on the differently improved mucks as experimental materials, evaluating whether the improvement state of each muck is proper or not according to the slump value, and performing accumulation experiments on the muck in each proper improvement state, namely simulating the muck to fall from the shield screw machine to the shield machine conveyor belt so as to obtain the stationary state secant angle value range [ w ] of the muck in the proper improvement state min ,w max ]；
Step 2, scanning the muck on the horizontal conveyor belt of the on-site shield tunneling machine through a three-dimensional laser scanner, wherein the scanning direction is vertical to the moving direction of the conveyor belt; scanning each time to obtain point cloud data of the muck surface, correspondingly establishing a muck surface curve on a horizontal conveying belt of the shield tunneling machine, and determining a secant angle theta of the muck on the horizontal conveying belt of the shield tunneling machine in a direction perpendicular to the moving direction of the conveying belt according to the muck surface curve;
the method for determining the secant angle comprises the following steps:
(1) Establishing a coordinate system by taking the direction of the accumulation of the dregs on the conveyor belt as a z-axis, the direction of the movement of the conveyor belt as a y-axis and the direction vertical to a yOz plane as an x-axis;
(2) All point cloud data obtained by scanning the surface of the muck along the x-axis direction by using the three-dimensional laser scanner are represented by using the established coordinate system, and then a muck surface curve f is fitted 1 (x,y,z)；
(3) Calculating the surface curve f of the dregs 1 (x, y, z), two points A having the largest z-axis value 1 (x 1 ,y 1 ,z 1 )、A 2 (x 2 ,y 2 ,z 2 ) And two points B with minimum z-axis value 1 (x 3 ,y 3 ,z 3 )、B 2 (x 4 ,y 4 ,z 4 ) (ii) a Wherein x is 1 ≤x 2 ，x 3 ＜x 4 ；
(4) According to four points A 1 ,A 2 ,B 1 ,B 2 Calculating the secant angle theta of the muck on the horizontal conveyor belt of the shield tunneling machine according to the following formula:
step 3, according to the secant angle theta of the muck on the horizontal conveyor belt of the shield tunneling machine and the secant angle value range [ w ] of the muck in the static state under the appropriate improvement state min ,w max ]And judging the improved state of the muck on the horizontal conveying belt of the shield tunneling machine in real time.
2. The method according to claim 1, wherein the judging method in step 3 is:
if λ θ ∈ [ w ] min ,w max ]Judging that the improvement state of the muck on the horizontal conveyor belt of the shield machine is proper; wherein, the lambda is a static and dynamic secant angle transformation coefficient, and the ratio of the muck secant angle measured in an indoor experiment to the muck secant angle on the horizontal conveying belt of the shield tunneling machine is obtained by muck under the same improved state;
if λ θ > w max If the flowability of the muck on the horizontal conveyor belt of the shield machine is poor, adjusting the water injection amount and the foam injection ratio to increase the flowability of the muck;
if λ θ < w min If the flowability of the slag soil on the horizontal conveyor belt of the shield machine is too strong or the slag soil is too loose, the water injection amount and the foam injection ratio need to be adjusted, so that the flowability of the slag soil is reduced.
3. The method as claimed in claim 1, wherein a three-dimensional laser scanner is used to emit linear laser, the point cloud data of the surface of the dregs is obtained by sending and receiving laser pulses, the point cloud data is denoised by programming or existing point cloud data processing software, and then a three-dimensional model is reconstructed on the surface of the dregs, so as to obtain a curve of the surface of the dregs perpendicular to the moving direction of the conveyor belt, and further determine the cutting line angle according to the curve of the surface of the dregs.
4. The method of claim 1, further comprising transmitting the scanned point cloud data in real time by the three-dimensional laser scanner through an ethernet or USB interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111657190.0A CN114487344B (en) | 2021-12-30 | 2021-12-30 | Real-time judgment method for improved state of muck on horizontal conveyor belt of shield tunneling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111657190.0A CN114487344B (en) | 2021-12-30 | 2021-12-30 | Real-time judgment method for improved state of muck on horizontal conveyor belt of shield tunneling machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114487344A CN114487344A (en) | 2022-05-13 |
| CN114487344B true CN114487344B (en) | 2022-10-28 |
Family
ID=81507821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111657190.0A Active CN114487344B (en) | 2021-12-30 | 2021-12-30 | Real-time judgment method for improved state of muck on horizontal conveyor belt of shield tunneling machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114487344B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02289792A (en) * | 1989-04-28 | 1990-11-29 | Konoike Constr Ltd | Earth pressure shield construction method |
| CN105952461A (en) * | 2016-06-17 | 2016-09-21 | 西南交通大学 | Testing apparatus and testing method for simulating improvement of residue earth during earth pressure balance shield construction |
| CN109344556A (en) * | 2018-11-30 | 2019-02-15 | 中南大学 | A kind of earth pressure balanced shield, EPBS sediment improvement parameter correction method based on live dregs state |
| CN110344838A (en) * | 2019-08-22 | 2019-10-18 | 中国电建集团铁路建设有限公司 | A kind of earth pressure balanced shield, EPBS structure and shield method with the anti-construction of gushing of gate |
| CN110552705A (en) * | 2019-05-27 | 2019-12-10 | 中铁十八局集团第四工程有限公司 | Automatic improvement method for residual soil during tunneling of earth pressure balance shield tunnel |
| CN111780671A (en) * | 2020-09-04 | 2020-10-16 | 中铁工程服务有限公司 | Shield muck volume scanning measurement system and method |
-
2021
- 2021-12-30 CN CN202111657190.0A patent/CN114487344B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02289792A (en) * | 1989-04-28 | 1990-11-29 | Konoike Constr Ltd | Earth pressure shield construction method |
| CN105952461A (en) * | 2016-06-17 | 2016-09-21 | 西南交通大学 | Testing apparatus and testing method for simulating improvement of residue earth during earth pressure balance shield construction |
| CN109344556A (en) * | 2018-11-30 | 2019-02-15 | 中南大学 | A kind of earth pressure balanced shield, EPBS sediment improvement parameter correction method based on live dregs state |
| CN110552705A (en) * | 2019-05-27 | 2019-12-10 | 中铁十八局集团第四工程有限公司 | Automatic improvement method for residual soil during tunneling of earth pressure balance shield tunnel |
| CN110344838A (en) * | 2019-08-22 | 2019-10-18 | 中国电建集团铁路建设有限公司 | A kind of earth pressure balanced shield, EPBS structure and shield method with the anti-construction of gushing of gate |
| CN111780671A (en) * | 2020-09-04 | 2020-10-16 | 中铁工程服务有限公司 | Shield muck volume scanning measurement system and method |
Non-Patent Citations (4)
| Title |
|---|
| 土压平衡盾构区段粉质黏土渣土改良技术探讨;孟宪雷;《现代城市轨道交通》;20200220(第02期);第43-49、61页 * |
| 富水砂卵石地层盾构施工渣土改良研究;马连丛;《工程科技》;20090215(第01期);第94-102页 * |
| 盾构泡沫改良砂性渣土渗透性及其受流塑性和水压力影响特征研究;王树英等;《中国公路学报》;20200215(第02期);第411-415页 * |
| 老黏土地层土压盾构刀盘堵塞渣土改良效果评价方法;杨益等;《北京交通大学学报》;20200511(第06期);第54-57页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114487344A (en) | 2022-05-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102539532B (en) | Ultrasonic C scanning imaging method based on two-dimensional neighborhood synthetic aperture focusing | |
| CN107576729B (en) | Ultrasonic phased array-based weld defect detection and rapid extraction system and method | |
| CN108956761A (en) | Steel plate all standing ultrasonic detection device and method | |
| CN111855809B (en) | Crack morphology reconstruction method based on compound mode full focusing | |
| CN101655464A (en) | Surface defect form and depth on-line lossless detection method of high-temperature continuous casting blank | |
| CN110108864B (en) | Nondestructive testing system and method for prestressed concrete beam | |
| CN105319272B (en) | A kind of immersed ultrasonic test method based on angular domain signal reconstruction | |
| CN102507740A (en) | Detecting method and detecting system for detecting rectangular metal bars | |
| CN105973990B (en) | A kind of Incline Crack TOFD quantitative detecting method based on geometrical relationship | |
| CN112819781B (en) | Concrete scouring quality assessment method, device and system | |
| CN110243320A (en) | A kind of Tunnel Lining Cracks depth non-contact measurement method and device | |
| CN105044211A (en) | TRL phased array probe-based defect 3D visualization ultrasonic testing flow | |
| CN106840053A (en) | A kind of leg size of fillet weld and internal flaw ultrasonic non-destructive measuring method | |
| CN105467011A (en) | Method for precisely positioning defect location during ultrasonic C scanning detection | |
| CN114487344B (en) | Real-time judgment method for improved state of muck on horizontal conveyor belt of shield tunneling machine | |
| CN106706759A (en) | Defect evaluation method for weld joints of P92-steel main steam pipeline of ultra-supercritical generating unit | |
| Jin et al. | Corrected Mode-Converted Wave Method for Detecting Defects in TOFD Dead Zone | |
| US8770029B2 (en) | Method and apparatus for ultrasonic testing | |
| CN201548222U (en) | Three-coordinate measuring instrument with ultrasonic flaw detection system | |
| JPS63309852A (en) | Ultrasonic flaw detecting method | |
| CN109358111A (en) | A kind of BOSS welding-seam phased array supersonic detection method based on curved surface shoulder coupling device | |
| CN110823926B (en) | Method for detecting quality of complex steel plate shear wall node based on ground penetrating radar scanning | |
| CN114544768A (en) | Single-hole ultrasonic detection device and method for continuous integrity and rock penetration depth of concrete impermeable wall | |
| Jin et al. | Simulation on qualitative detection of defects with multi-mode total focusing method | |
| CN109798824B (en) | Method and system for three-dimensional detection of concrete cavity with crack |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |