CN112629478A - Space monitoring method for deformation and deflection of existing underground structure during subway station construction - Google Patents
Space monitoring method for deformation and deflection of existing underground structure during subway station construction Download PDFInfo
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- CN112629478A CN112629478A CN202011516825.0A CN202011516825A CN112629478A CN 112629478 A CN112629478 A CN 112629478A CN 202011516825 A CN202011516825 A CN 202011516825A CN 112629478 A CN112629478 A CN 112629478A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C7/00—Tracing profiles
- G01C7/06—Tracing profiles of cavities, e.g. tunnels
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Abstract
A space monitoring method for deformation and deflection of an existing underground structure in subway station construction combines a traditional drilling technology with an intelligent monitoring instrument, an inclinometer and a settlement instrument are used for monitoring the same monitoring point to obtain an offset value and a settlement value of each monitoring point, the offset value and the settlement value are compared with a reference point to obtain an absolute offset value and an absolute settlement value of each monitoring point, a space measuring track of the inclinometer and the settlement instrument, namely a three-dimensional space track of a detection hole, is simulated according to the absolute offset value and the absolute settlement value, the outer contour of the existing structure is fitted according to the three-dimensional space tracks of a plurality of detection section detection holes, and monitoring accuracy is improved. The method can predict the influence of the construction of the newly-built station on the existing structure in actual construction, further determine the dangerous area in construction, make a protection scheme in advance and avoid engineering accidents. The invention can be applied to the detection of the existing tunnel, and is also suitable for stations and other existing structures with large burial depth.
Description
Technical Field
The invention relates to the technical field of underground structure monitoring and rapid analysis, in particular to a space monitoring method for deformation and deflection of an existing underground structure and establishment of a rapid analysis platform.
Background
Under the condition that the construction of a newly-built subway station is close to an existing structure, for the built underground structures such as an existing subway tunnel and a station, the monitoring cost is high, only limited monitoring point changes can be obtained through manual monitoring modes such as a total station and a level gauge, and the accuracy of data acquisition is easily influenced by the environment; nondestructive testing methods such as ground penetrating radar and seismic wave method are adopted, only the approximate position of the underground structure can be monitored, and the accurate deformation condition of the underground structure such as a tunnel cannot be obtained; in the conventional drilling mode, the burial depth of structures such as an underground tunnel and the like is determined according to the depth of a drill rod, the settlement measured by the drill rod under the vertical condition is the real settlement amount of the structures, but in the actual construction environment, the drill rod is difficult to reach the ideal state of vertical downward due to uneven stratum softness, so that the accurate position of the underground structure is difficult to obtain in the monitoring process, and the settlement and tiny deformation conditions cannot be obtained.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a space monitoring method and a rapid analysis platform for deformation and deflection of the existing underground structure in subway station construction.
A space monitoring method for deformation and deflection of an existing underground structure in subway station construction combines a traditional drilling technology with an intelligent monitoring instrument, an inclinometer and a settlement instrument are used for monitoring the same monitoring point to obtain an offset value and a settlement value of each monitoring point, the offset value and the settlement value are compared with a reference point to obtain an absolute offset value and an absolute settlement value of each monitoring point, a space measuring track of the inclinometer and the settlement instrument, namely a three-dimensional space track of a detection hole, is simulated according to the absolute offset value and the absolute settlement value, the outer contour of the existing structure is fitted according to the three-dimensional space tracks of a plurality of detection section detection holes, and monitoring accuracy is improved.
The combined use of the inclinometer and the settlement gauge is realized by monitoring the same measuring points in a detecting hole through two gauges, the inclinometer is also used as the settlement pipe, a plurality of measuring points are distributed in the pipe at intervals, meanwhile, the settlement rings are sequentially sleeved at the corresponding measuring points outside the pipe, the inclinometer is placed to the bottom of the hole in the detecting hole, the deviation value and the settlement value of the existing structure are monitored through the inclinometer and the settlement gauge respectively, the position 3-5 times away from the existing structure is selected as a monitoring reference point, and the absolute deviation value and the absolute settlement value of the existing structure can be obtained through comparison.
The detection hole is a region which is unfavorable for the existing structure in the newly-built construction is determined through three-dimensional simulation analysis, the detection section is determined through an intelligent optimization algorithm, the hole position to be drilled is calibrated on the detection section, and the detection hole is formed through drilling.
The rapid analysis platform formed by the invention is used for monitoring the settlement deformation data of the existing structure based on a space monitoring method, comparing, modifying and correcting a simulation model of the influence of the construction of the subway station established in the early stage on the existing underground structure, establishing a deformation deflection prediction model of the existing structure, forming the rapid analysis platform capable of reflecting the settlement deformation of the existing tunnel in real time, predicting the area which is less favorable for the influence of the construction of the newly-built subway station on the existing structure, determining the key links and the unfavorable construction stage in the construction, and formulating a reasonable supporting scheme.
The inclinometer sequentially measures a transverse offset value and an axial offset value at each measurement point. The transverse direction and the axial direction respectively refer to the direction vertical to the tunnel in the horizontal direction and the axial direction along the tunnel, and the three-dimensional space track of the detection hole is calculated according to the transverse deviation value and the axial deviation value at the measuring point.
And the settlement meter measures settlement values at all measuring points, modifies and corrects the obtained settlement values and the transverse offset values measured by the inclinometer, synthesizes the transverse offset values, the axial offset values and the settlement values after modification of a plurality of detection sections, and combines a simulation model to obtain the three-dimensional space prediction model of the existing tunnel.
Deviation and displacement in the lateral and vertical directions of the actually detected tunnel position from the as-built measured position or the designed position of the tunnel are obtained by fitting the outer contour of the tunnel.
And fitting the outer contour of the tunnel to obtain the deformation condition of the tunnel.
When drilling a hole site to be drilled, drilling till the surface of the segment of the tunnel.
The detection section is vertical to the direction of the tunnel to be monitored or intersected with the direction of the tunnel to be monitored at a large angle.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, on the basis of traditional drilling, the inclinometer and the settlement gauge are combined for use, and the settlement gauge can be used for correcting the monitoring data of the inclinometer, so that the detection error is reduced, and the accuracy of the monitoring data is improved.
2. The rapid analysis platform formed by the invention combines model analysis and intelligent monitoring, contrasts, analyzes and corrects model analysis data and actual monitoring data to form a prediction model capable of reflecting the stress deformation condition of the existing structure in real time, can predict the influence of the construction of a newly-built station on the existing structure in actual construction, further determines the dangerous area in construction, makes a protection scheme in advance and avoids engineering accidents.
3. The invention can be applied to the detection of the existing tunnel, and is also suitable for stations and other existing structures with large burial depth.
Drawings
Fig. 1 is a plan view showing the distribution of the ground surface survey section of the conventional existing tunnel according to the present invention.
Fig. 2 is a distribution diagram of conventional existing tunnel detection cross-sections and layout points according to the present invention.
FIG. 3 is a view of the installation layout of the monitoring instrument of the present invention.
Wherein, 1-existing tunnel; 2-a first detection section; 3-a second detection section; 4-a third detection section; 5-nth detection section; 6-ground; 7-a detection point on the first detection section; 8-detecting points on a second detection section; 9-detecting points on a third detection section; 10-detecting a detection point on the nth detection section; 11-measuring a ruler; 12-a detection hole; 13-an inclinometer pipe and a settling pipe; 14-connecting a sensor; 15-a filler; 16-settling ring.
Detailed Description
Referring to fig. 1, 2 and 3, a method for monitoring deformation and deflection of an existing underground structure in a subway station construction includes:
1. establishing a finite difference model about the existing tunnel 1 by combining the spatial position relation of newly-built station construction to the existing tunnel in actual engineering, and analyzing the stress and displacement distribution of the supporting structure of the existing tunnel 1 and the settlement rules of the earth surface and the existing tunnel 1 in different construction stages;
2. as shown in fig. 1 and 2, a first detection section 2, a second detection section 3, a third detection section 4, an nth detection section 5, a detection point 7 on the first detection section, a detection point 8 on the second detection section, a detection point 9 on the third detection section and a detection point 10 on the nth detection section are determined above an existing tunnel to be monitored, and a detection hole 12 is drilled in a detection point; as shown in fig. 3, the inclinometer 13 is also used as a settling tube, a plurality of measuring points are distributed at intervals in the tube, meanwhile, the settling rings 16 are sequentially sleeved at the corresponding measuring points outside the tube, and the settling rings 16 are not connected with the inclinometer 13;
3. lowering an inclinometer 13 to the bottom of the hole in the detection hole 12, recording the total length of the inclinometer 13, and sequentially measuring the offset value at each measurement point, wherein the offset value comprises a transverse offset value and an axial offset value at the measurement point; a filler 15 is filled between the inclinometer tube 13 and the detection hole 12;
4. the settlement gauge comprises a measuring ruler 11 and a connecting sensor 14 (magnetic induction probe) connected to one end of the measuring ruler 11, wherein the connecting sensor 14 sends out signals when moving in the inclinometer 13 and approaching to the settlement ring 16, measures the settlement value at each measuring point and checks the measured settlement value against the transverse deviation value;
5. selecting a position 3-5 times away from the existing tunnel 1 as a monitoring reference point, and performing comparative analysis on the reference point to obtain an absolute deviation value and an absolute settlement value of each measuring point based on the deviation value and the settlement value of each measuring point obtained by an inclinometer and a settlement meter;
6. calculating a space measurement track of the inclinometer and the settlement gauge, namely a three-dimensional space track of the detection hole 12 according to the data of the absolute deviation value and the absolute settlement value, acquiring a three-dimensional space coordinate of the hole bottom of the detection hole 12 according to the three-dimensional space track, and fitting the outer contour of the existing structure according to the three-dimensional space tracks of the detection section detection holes 12 to improve the monitoring precision;
7. the limited simulation model is corrected based on the monitoring dynamic data, a deformation deflection prediction model of the existing tunnel 1 is established, a rapid analysis platform capable of reflecting the change of the existing tunnel 1 is formed, the construction of a newly-built subway station is guided, a reasonable proposal plan is provided for a reinforcing and supporting mode of the newly-built subway construction, and the safety of an existing underground structure in the construction process of the newly-built subway station is ensured.
The invention can be applied to the detection of the existing tunnel, and is also suitable for stations and other existing structures with large burial depth.
Claims (1)
1. The utility model provides a space monitoring method that subway station construction shifts to existing underground structure deformation which characterized in that: the method comprises the following steps:
1) establishing a finite difference model about the existing tunnel (1) by combining the spatial position relation of newly-built station construction to the existing tunnel in actual engineering, and analyzing the stress and displacement distribution of the supporting structure of the existing tunnel (1) and the settlement rules of the earth surface and the existing tunnel (1) in different construction stages;
2) determining a first detection section (2), a second detection section (3), a third detection section (4), an nth detection section (5), a detection point (7) on the first detection section, a detection point (8) on the second detection section, a detection point (9) on the third detection section and a detection point (10) on the nth detection section above an existing tunnel to be monitored, and drilling the detection points to form detection holes (12); the inclinometer pipe (13) is also used as a sedimentation pipe, a plurality of measuring points are distributed at intervals in the pipe, meanwhile, sedimentation rings (16) are sequentially sleeved at the corresponding measuring points outside the pipe, and the sedimentation rings (16) are not connected with the inclinometer pipe (13);
3) placing an inclinometer pipe (13) to the bottom of the hole in the detection hole (12), recording the total length of the inclinometer pipe (13), and sequentially measuring the offset value at each measurement point, wherein the offset value comprises a transverse offset value and an axial offset value at the measurement point; a filler (15) is filled between the inclinometer tube (13) and the detection hole (12);
4) the settlement gauge comprises a measuring ruler (11) and a connecting sensor (14) (a magnetic induction probe) connected to one end of the measuring ruler (11), wherein the connecting sensor (14) sends out signals when moving in the inclinometer pipe (13) and approaching to the settlement ring (16), measures settlement values at all measuring points and checks the measured settlement values against transverse deviation values;
5) selecting a position 3-5 times as far as the existing tunnel (1) as a monitoring reference point, and carrying out comparative analysis on the reference point to obtain an absolute deviation value and an absolute settlement value of each measuring point based on the deviation value and the settlement value of each measuring point obtained by an inclinometer and a settlement meter;
6) calculating a space measurement track of the inclinometer and the settlement gauge, namely a three-dimensional space track of the detection hole (12), according to the data of the absolute deviation value and the absolute settlement value, acquiring a three-dimensional space coordinate of the hole bottom of the detection hole (12) according to the three-dimensional space track, and fitting the outer contour of the existing structure according to the three-dimensional space tracks of the detection holes (12) of the detection sections, so that the monitoring precision is improved;
7) the limited simulation model is corrected based on the monitored dynamic data, a deformation deflection prediction model of the existing tunnel (1) is established, a rapid analysis platform capable of reflecting the change of the existing tunnel (1) is formed, the construction of a newly-built subway station is guided, a reasonable suggestion plan is provided for a newly-built subway construction reinforcing and supporting mode, and the safety of an existing underground structure in the construction process of the newly-built subway station is guaranteed.
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| CN202011516825.0A CN112629478A (en) | 2020-12-21 | 2020-12-21 | Space monitoring method for deformation and deflection of existing underground structure during subway station construction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113124826A (en) * | 2021-04-13 | 2021-07-16 | 中铁十四局集团有限公司 | Method for monitoring sedimentation |
| CN113446994A (en) * | 2021-06-10 | 2021-09-28 | 中铁隧道局集团路桥工程有限公司 | Three-dimensional intelligent monitoring method for structure adjacent to existing station in newly-built subway construction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113124826A (en) * | 2021-04-13 | 2021-07-16 | 中铁十四局集团有限公司 | Method for monitoring sedimentation |
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Application publication date: 20210409 |