CN113156491A - Shield stratum disturbance detection method - Google Patents
Shield stratum disturbance detection method Download PDFInfo
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- CN113156491A CN113156491A CN202110392933.XA CN202110392933A CN113156491A CN 113156491 A CN113156491 A CN 113156491A CN 202110392933 A CN202110392933 A CN 202110392933A CN 113156491 A CN113156491 A CN 113156491A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
- G01V1/288—Event detection in seismic signals, e.g. microseismics
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
- G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
- G01V1/181—Geophones
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
- G01V1/30—Analysis
- G01V1/303—Analysis for determining velocity profiles or travel times
Abstract
The invention discloses a shield stratum disturbance detection method, which comprises the following steps: before shield construction, performing first micro-motion detection on a shield target section to obtain first wave velocity data of each stratum of the shield target section; after the shield construction, performing second micro-motion detection on the shield target section to obtain second wave velocity data of each stratum of the shield target section; obtaining the wave velocity change rate of the target section of the shield in each stratum before and after the shield according to the first wave velocity data and the second wave velocity data; and judging the disturbance condition of each stratum of the shield target section based on the wave velocity change rate of each stratum of the shield target section before and after the shield. The invention provides a shield stratum disturbance detection method, which solves the technical problem that stratum structures need to be damaged when monitoring the stratum disturbance condition before and after a shield in the prior art.
Description
Technical Field
The invention relates to the technical field of shield construction stratum monitoring, in particular to a shield stratum disturbance detection method.
Background
The shield construction is a common method in subway tunnel construction, which is a mechanized construction method that a shield machine is propelled in the ground, surrounding rocks around the shield machine are supported by a shield shell and pipe pieces to prevent collapse into the tunnel, meanwhile, a cutting device is used for excavating soil in front of excavation, the soil is transported out of the tunnel by an unearthing machine, is pressed and jacked at the rear part by a jack, and precast concrete pipe pieces are assembled to form a tunnel structure.
In shield construction, stratum disturbance caused by shield construction is often required to be monitored, and the stratum is required to be damaged by the conventional stratum disturbance monitoring method.
Disclosure of Invention
The invention mainly aims to provide a shield stratum disturbance detection method, and aims to solve the technical problem that the stratum is damaged when stratum disturbance monitoring is carried out in the prior art.
In order to achieve the purpose, the invention provides a shield stratum disturbance detection method, which comprises the following steps:
before shield construction, performing first micro-motion detection on a shield target section to obtain first wave velocity data of each stratum of the shield target section;
after the shield construction, performing second micro-motion detection on the shield target section to obtain second wave velocity data of each stratum of the shield target section;
obtaining the wave velocity change rate of the target section of the shield in each stratum before and after the shield according to the first wave velocity data and the second wave velocity data;
and judging the disturbance condition of each stratum of the shield target section based on the wave velocity change rate of each stratum of the shield target section before and after the shield.
Optionally, the first wave velocity data and the second wave velocity data each include formation depth data of each formation and wave velocity data corresponding to the formation depth data; the step of obtaining the wave velocity change rate of the shield target section in each stratum before and after the shield according to the first wave velocity data and the second wave velocity data comprises the following steps:
obtaining the wave velocity change rate of each stratum according to the following formula:
λ＝(V2-V1)÷V1(ii) a Wherein λ is the rate of change of wave velocity, V1、V2The first measurement wave velocity obtained before the shield of the same stratum and the second measurement wave velocity obtained after the shield are respectively obtained.
Optionally, the step of determining the disturbance condition of each stratum of the shield target section based on the wave velocity change rate of each stratum of the shield target section before and after the shield comprises:
and if the wave velocity change rate obtained by the same stratum of the target section of the shield is less than 0, the geological structure of the stratum becomes more compact compared with that before the shield.
Optionally, the step of determining the disturbance condition of each stratum of the shield target section based on the wave velocity change rate of each stratum of the shield target section before and after the shield comprises:
and if the wave velocity change rate obtained by the same stratum of the target section of the shield is greater than 0, the geological structure of the stratum becomes looser than that before the shield.
Optionally, before the shield construction, the step of performing a first micro-motion detection on the shield target section to obtain first wave velocity data of each stratum of the shield target section includes:
before shield construction, first micro-motion detection is carried out on each stratum of a shield target section through at least one group of micro-motion detection units, and first wave velocity data of each stratum of the shield target section are obtained.
Optionally, after the shield construction, performing a second micro-motion detection on the shield target section to obtain second wave velocity data of each stratum of the shield target section, including:
after the shield construction is finished, second micro-motion detection is carried out on each stratum of the shield target section through the micro-motion detection unit, and second wave velocity data of each stratum of the shield target section are obtained.
Optionally, the micro-motion detection unit comprises a micro-motion detection array and a first detector arranged in the center of the micro-motion detection array.
Optionally, the micro-motion detection array comprises at least three second detectors.
Optionally, the second detectors of the micro-motion detection array are evenly distributed on the same virtual circumference.
Optionally, the first detector and the second detector are both surface wave detectors.
According to the technical scheme, micro-motion detection is respectively carried out on the front and the back of the shield at the shield target section by adopting the microwave detection unit, wave velocity data of the shield target section on each stratum in the front and the back of the shield are obtained, and the change condition of stratum disturbance is analyzed according to the wave velocity change condition of the same stratum in the front and the back of the shield.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a first embodiment of the present invention;
FIG. 2 is a schematic flow chart of a second embodiment of the present invention;
FIG. 3 is a diagram of a distribution of micro-motion detection units according to a second embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a micro-motion detection unit according to an embodiment of the present invention;
the reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
In the deep soil monitoring method, a plurality of monitoring holes are required to be arranged on site, magnetic rings are arranged in different geological layers in the monitoring holes, and deformation of the deep soil in the x direction, the y direction and the z direction is monitored through the distance change between a measuring head of a measuring and reading device and the magnetic rings.
In order to solve the problems, the invention provides a shield stratum disturbance detection method which is used for detecting the stratum disturbance conditions before and after a shield.
The method of the embodiment can be implemented based on a disturbance detection system, which comprises a micro-motion detection unit, wherein the micro-motion detection unit comprises a micro-motion detection array and a first detector arranged at the center of the micro-motion detection array, and the micro-motion detection array comprises three second detectors uniformly distributed on the same virtual circumference. Specifically, during detection, the system is arranged on the ground of a shield path of the shield machine.
As shown in fig. 1, based on the above system, the method of the present embodiment includes the following steps:
s20, before shield construction, performing first micro-motion detection on a shield target section to obtain first wave velocity data of each stratum of the shield target section.
In a specific implementation process, the shield target section is a construction route requiring the construction of a shield machine in the underground engineering operation.
Specifically, the micro-motion detection is to detect a complex vibration composed of body waves and surface waves by using a detector, extract a dispersion curve of the surface waves (Rayleigh waves) from a micro-motion signal, and obtain a transverse wave velocity structure of the underground medium through inversion of the dispersion curve. Because the energy of the surface wave in the vertical direction accounts for more than 70% of the total energy of the signal in the complex vibration, the first detector and the second detector can adopt surface wave detectors, the surface wave speed has a close relation with the compactness of a rock-soil layer, the low speed indicates that the soil layer is soft, the high speed indicates that the compactness of the soil layer is high, and the compactness of the soil layer can be judged by comparing the surface wave speeds.
Before shield construction begins, a group of micro-motion detection units are arranged on the ground of a shield target section, the micro-motion detection units are used for carrying out first micro-motion detection on each stratum of the shield target section, and stratum depth data of each stratum and surface wave velocity data, corresponding to the stratum depth data, of the stratum obtained in the first micro-motion detection are merged and recorded as first wave velocity data.
And S40, after the shield construction, performing second micro-motion detection on the shield target section to obtain second wave velocity data of each stratum of the shield target section.
After the shield construction is finished, the micro-motion detection unit is used for carrying out secondary micro-motion detection on the stratum of the shield target section, in the secondary micro-motion detection, the arrangement position of the micro-motion detection unit is the same as the position in the primary micro-motion detection, data errors caused by external factors are avoided, the accuracy of detection results is guaranteed, and stratum depth data of each stratum and surface wave speed data, corresponding to the stratum, of the stratum in the secondary micro-motion detection are merged and recorded as second wave speed data.
And S60, obtaining the wave velocity change rate of the shield target section in the front and the back of the shield in each stratum according to the first wave velocity data and the second wave velocity data.
After the first wave velocity data and the second wave velocity data are obtained, the formula λ ═ V (V) is used2-V1)÷V1Calculating the wave velocity change rate of the shield target section in each stratum before and after the shield, wherein V1、V2The wave velocity of the surface wave obtained in the first micro-motion detection and the wave velocity of the surface wave obtained in the second micro-motion detection of the same stratum are respectively.
Specifically, the wave velocity change rate reflects the change situation of the surface wave velocity of the stratum before and after the shield, and the stratum disturbance situation of the stratum before and after the shield can be deduced according to the relation between the compactness of the rock-soil layer and the surface wave velocity.
And S80, judging the disturbance condition of each stratum of the shield target section based on the wave velocity change rate of each stratum of the shield target section before and after the shield.
The method for judging the stratum disturbance conditions before and after the shield according to the relationship between the surface wave velocity and the soil layer compactness by determining the wave velocity change condition of the stratum according to the wave velocity change rate comprises the following steps:
if the wave velocity change rate obtained by the same stratum of the target section of the shield is less than 0, the geological structure of the stratum after the shield becomes more compact than that before the shield;
if the wave velocity change rate obtained by the same stratum of the target section of the shield is greater than 0, the stratum becomes more loose after the shield compared with the stratum before the shield;
if the wave velocity change rate obtained by the same stratum of the target section of the shield is equal to 0, the geological structure of the stratum after the shield does not have obvious change compared with the stratum before the shield.
In the scheme of the embodiment, only the micro-motion detection unit is arranged on the ground of the target section of the shield in the detection of the stratum disturbance before and after the shield, the stratum structure is not damaged, meanwhile, the requirement on the detection position environment by the micro-motion detection unit is low, the setting is convenient, and the stratum disturbance condition before and after the shield can be detected under the condition that the stratum structure is not damaged.
In order to solve the problem that the stratum disturbance detection is influenced by environmental factors, the invention further provides a shield stratum disturbance detection method which is used for improving the accuracy of the disturbance detection result and reducing the influence of external factors on the detection result.
The method of the embodiment can be realized based on a disturbance detection system, which comprises four groups of micro-motion detection units with the same specification, wherein each micro-motion detection unit comprises a micro-motion detection array and a first detector arranged at the center of the micro-motion detection array, and the micro-motion detection array comprises three second detectors uniformly distributed on the same virtual circumference.
Specifically, during detection, four groups of micro-motion detection units in the system are arranged on the ground of the shield machine in the shield distance at intervals. As shown in fig. 3, based on the above system, another embodiment of the method of the present invention comprises the following steps:
and S10, before shield construction, performing first micro-motion detection on a shield target section by using the disturbance detection system, and respectively recording first wave velocity data of the four groups of micro-motion detection units.
Specifically, before shield construction, a first micro-motion detection unit Z1, a second micro-motion detection unit Z2, a third micro-motion detection unit Z3 and a fourth micro-motion detection unit Z4 are arranged on the ground of a shield target section at intervals and are respectively marked as a first micro-motion detection unit Z1, a second micro-motion detection unit Z2, a third micro-motion detection unit Z3 and a fourth micro-motion detection unit Z4, first micro-motion detection is carried out on each stratum of the shield target section by using the first micro-motion detection unit Z1, the second micro-motion detection unit Z2, the third micro-motion detection unit Z3 and the fourth micro-motion detection unit Z4, and first wave velocity data of each micro-motion detection unit is recorded respectively.
And S30, after the shield construction, performing second micro-motion detection on the shield target section by using the disturbance detection system, and respectively recording second wave velocity data of the four groups of micro-motion detection units.
Specifically, after shield construction, a first micro-motion detection unit Z1, a second micro-motion detection unit Z2, a third micro-motion detection unit Z3 and a fourth micro-motion detection unit Z4 are used for carrying out second micro-motion detection on each stratum of a shield target section, wherein the first micro-motion detection unit Z1, the second micro-motion detection unit Z2, the third micro-motion detection unit Z3 and the fourth micro-motion detection unit Z4 are the same as the arrangement positions of the first micro-motion detection, and second wave velocity data of each micro-motion detection unit are recorded respectively
And S50, obtaining the wave velocity change rate of each stratum before and after the shield of the shield target section according to the first wave velocity data and the second wave velocity data respectively recorded by the four groups of micro-motion detection units.
Specifically, after the second micro-motion detection is finished, the first waves are respectively recorded according to the four groups of micro-motion detection unitsThe velocity data and the second wave velocity data respectively calculate the surface wave velocity change rate of the micro-motion detection units of the four groups to the same stratum, and respectively record the surface wave velocity change rate as lambda1、λ2、λ3And λ4。
S70, obtaining surface wave velocity change rate lambda in the same stratum based on four groups of micro-motion detection units1、λ2、λ3And λ4And judging the stratum disturbance condition of the same stratum before and after the shield.
Specifically, based on the relationship between the surface wave velocity and the soil layer compactness, the stratum disturbance condition of the stratum before and after the shield can be deduced by comparing the surface wave velocities of the same stratum before and after the shield.
The judging method comprises the following steps:
if the wave velocity change rate obtained by the same stratum of the target section of the shield is less than 0, the geological structure of the stratum after the shield becomes more compact than that before the shield;
if the wave velocity change rate obtained by the same stratum of the target section of the shield is greater than 0, the stratum becomes more loose after the shield compared with the stratum before the shield;
if the wave velocity change rate obtained by the same stratum of the target section of the shield is equal to 0, the geological structure of the stratum after the shield does not have obvious change compared with the stratum before the shield.
And respectively obtaining the formation disturbance conditions detected by the first micro-motion detection unit Z1, the second micro-motion detection unit Z2, the third micro-motion detection unit Z3 and the fourth micro-motion detection unit Z4.
And S90, comparing the stratum disturbance conditions before and after the shield detected by the four groups of micro-motion detection units, and determining the stratum disturbance conditions before and after the shield of the same stratum.
Specifically, whether the detection is influenced by external environmental factors is determined by comparing whether the stratum disturbance conditions detected by the four groups of micro-motion detection units are consistent; if the stratum disturbance conditions detected by the four groups of micro-motion detection units are consistent, the detection result is not influenced by external environment factors; and if the stratum disturbance conditions detected by the four groups of micro-motion detection units are inconsistent, all the detection results are invalidated and re-detection is carried out.
In the embodiment, the control group is arranged, so that the influence of external factors on the detection result is reduced, the accuracy of the detection result is ensured, and the formation structure is not damaged in the formation disturbance detection process.
Based on the shield stratum disturbance detection method of the above embodiment, as shown in fig. 2, the micro-motion detection unit may further include: the micro-motion detection array comprises five second detectors which are uniformly distributed on the same virtual circumference, and the first detectors are arranged on the virtual circumference center of the micro-motion detection array.
Generally speaking, in the micro-motion detection, the more detectors are arranged, the more side length is, the more accurate the extracted dispersion curve is, and in consideration of actual cost and detection effect, the arrangement of six detectors is optimal, economical and reasonable while the detection effect is ensured.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A shield stratum disturbance detection method is characterized by comprising the following steps:
before shield construction, performing first micro-motion detection on a shield target section to obtain first wave velocity data of each stratum of the shield target section;
after the shield construction, performing second micro-motion detection on the shield target section to obtain second wave velocity data of each stratum of the shield target section;
obtaining the wave velocity change rate of the target section of the shield in each stratum before and after the shield according to the first wave velocity data and the second wave velocity data;
and judging the disturbance condition of each stratum of the shield target section based on the wave velocity change rate of each stratum of the shield target section before and after the shield.
2. The shield formation disturbance detection method of claim 1, wherein: the first wave velocity data and the second wave velocity data comprise formation depth data of each stratum and wave velocity data corresponding to the formation depth data; the step of obtaining the wave velocity change rate of the shield target section in each stratum before and after the shield according to the first wave velocity data and the second wave velocity data comprises the following steps:
obtaining the wave velocity change rate of each stratum according to the following formula: λ ═ V2-V1)÷V1(ii) a Wherein λ is the rate of change of wave velocity, V1、V2The first measurement wave velocity obtained before the shield of the same stratum and the second measurement wave velocity obtained after the shield are respectively obtained.
3. The method for detecting disturbance of a shield stratum according to claim 2, wherein the step of determining the disturbance condition of each stratum at the target section of the shield based on the wave velocity change rate of each stratum at the target section of the shield before and after the shield comprises:
and if the wave velocity change rate obtained by the same stratum of the target section of the shield is less than 0, the geological structure of the stratum after the shield becomes more compact compared with that before the shield.
4. The method for detecting disturbance of a shield stratum according to claim 2, wherein the step of determining the disturbance condition of each stratum at the target section of the shield based on the wave velocity change rate of each stratum at the target section of the shield before and after the shield comprises:
and if the wave velocity change rate obtained by the same stratum of the target section of the shield is greater than 0, the geological structure of the stratum after the shield becomes looser than that before the shield.
5. The method for detecting disturbance of a shield stratum according to claim 1, wherein the step of performing a first micro-motion detection on a target section of the shield to obtain first wave velocity data of each stratum of the target section of the shield before shield construction comprises:
before shield construction, first micro-motion detection is carried out on each stratum of a shield target section through at least one group of micro-motion detection units, and first wave velocity data of each stratum of the shield target section are obtained.
6. The method for detecting disturbance of a shield stratum according to claim 5, wherein the step of performing a second micro-motion detection on the target section of the shield to obtain second wave velocity data of each stratum of the target section of the shield comprises:
after the shield construction, second micro-motion detection is carried out on each stratum of the shield target section through the micro-motion detection unit, and second wave velocity data of each stratum of the shield target section are obtained.
7. The shield formation disturbance detection method of claim 6, wherein: the micro-motion detection unit comprises a micro-motion detection array and a first detector arranged in the center of the micro-motion detection array.
8. The shield formation disturbance detection method of claim 7, wherein: the micro-motion detection array comprises at least three second detectors.
9. The shield formation disturbance detection method of claim 8, wherein: and the second detectors of the micro-motion detection array are uniformly distributed on the same virtual circumference.
10. The method of any of claims 7-9, wherein the method comprises: the first detector and the second detector are both surface wave detectors.
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| CN102943461A (en) * | 2012-12-06 | 2013-02-27 | 天津市市政工程设计研究院 | Quantitative analysis method for evaluating dynamic compaction reinforcement effect of foundation by utilizing Rayleigh surface waves |
| CN112505749A (en) * | 2020-10-19 | 2021-03-16 | 中国地质调查局南京地质调查中心(华东地质科技创新中心) | Micro-motion data acquisition method based on multiple coverage of linear array |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943461A (en) * | 2012-12-06 | 2013-02-27 | 天津市市政工程设计研究院 | Quantitative analysis method for evaluating dynamic compaction reinforcement effect of foundation by utilizing Rayleigh surface waves |
| CN112505749A (en) * | 2020-10-19 | 2021-03-16 | 中国地质调查局南京地质调查中心(华东地质科技创新中心) | Micro-motion data acquisition method based on multiple coverage of linear array |
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