CN-122015681-A - Method for monitoring vertical deformation of vertical shaft wall of overall collaborative local

CN122015681ACN 122015681 ACN122015681 ACN 122015681ACN-122015681-A

Abstract

The invention discloses a method for monitoring vertical deformation of a vertical well wall in a general cooperative local mode, which comprises the following steps of S1, forming a vertical micro-groove along the whole depth of the well wall, circumferentially and equidistantly arranging a plurality of sensing optical fibers, uniformly arranging monitoring points on each sensing optical fiber, S2, burying the sensing optical fibers in the micro-groove by using filling materials, S3, automatically collecting data of the sensing optical fibers by using a cabinet-type dense distributed demodulator, S4, introducing a high-precision laser ranging system for cooperative monitoring, combining the sensing optical fibers to form a plurality of detection groups, and S5, correcting the segmentation coefficient of original monitoring data of the sensing optical fibers by using deformation quantities measured by each detection group, so that a real whole depth strain field of the well wall is obtained. The invention can realize high-precision, near-continuous and high-cost performance vertical strain monitoring of the well wall, and can accurately position a potential fracture area.

Inventors

SHANG XIANGYU
WANG HAORAN
JIN YI
YANG ZHIJIANG
HAN RUI
Qin Sisuo

Assignees

中国矿业大学

Dates

Publication Date: 20260512
Application Date: 20260127

Claims (6)

1. The method for monitoring the vertical deformation of the vertical shaft wall of the overall collaborative local is characterized by comprising the following steps of: s1, a vertical micro-groove is formed along the full depth of a well wall, a plurality of sensing optical fibers are distributed at equal intervals in the circumferential direction, and monitoring points are distributed on each sensing optical fiber at equal intervals; S2, burying the sensing optical fiber in the micro groove by using a filling material; S3, data acquisition of sensing optical fibers is automatically acquired by using a cabinet-type dense distributed demodulator; S4, introducing a high-precision laser ranging system for collaborative monitoring, wherein the high-precision laser ranging system layout method comprises the following steps: arranging laser reflection targets at initial monitoring points at the top end of sensing optical fibers according to the number of the sensing optical fibers, and correspondingly arranging laser range finders at the tail monitoring points at the bottom end of the sensing optical fibers to ensure that each laser path is consistent with each sensing optical fiber path so as to form a plurality of monitoring groups consisting of the sensing optical fibers and the laser range finders; s5, utilizing deformation quantity measured by each monitoring group to carry out segment coefficient correction on original monitoring data of the sensing optical fiber, thereby obtaining a real well wall full-depth strain field.
2. The method for monitoring vertical deformation of a vertical well wall in a global cooperative local area according to claim 1, wherein the step of micro-groove opening comprises the steps of: 1) Marking the inner wall, namely drawing a mark along a vertical path of the well wall by using a marking tool; 2) Grooving, namely adopting a concrete cutting tool to open a micro groove along the marking path to ensure that all the sensing optical fibers are immersed in the micro groove; 3) Cleaning, namely dedusting and dehumidifying the groove by adopting hot air, a hairbrush and rag after cutting is completed; 4) And (3) coating, namely mixing the epoxy resin component and the curing agent in a ratio of 1:0.25, and then coating the mixture on the inner surface of the micro-groove to form a good bonding surface between the filling material and the original borehole wall concrete.
3. The method for monitoring the vertical deformation of the well wall of the well in the whole cooperative part according to claim 2, wherein the depth of the micro groove is 10-30mm, the opening diameter of the micro groove is 4-10mm, and the bottom of the micro groove is 2-3mm larger than the opening diameter of the micro groove.
4. The method for monitoring the vertical deformation of the well wall of the well, which is generally cooperated and local, according to claim 1 or 2, wherein the sensing optical fibers are arranged along the vertical direction, and the optical fibers are kept vertical and are attached to the bottom of the micro-groove by utilizing the V-shaped spring piece.
5. The method for monitoring vertical deformation of a vertical well wall according to claim 1, wherein the filling material is modified epoxy mortar, if the depth of a micro groove is greater than 10mm, the filling material is filled in layers, each layer does not exceed 10mm, compaction is carried out after each layer is filled, and the next layer is filled after the layer is completely compacted and has no bubbles.
6. The method for monitoring vertical deformation of a vertical well wall according to claim 1 is characterized in that after filling materials are finally solidified, correction coefficients of a first group of monitoring groups are solved according to data obtained by monitoring a plurality of times at equal time intervals of sensing optical fibers and a laser range finder in the first group of monitoring groups, the correction coefficients are brought into original data to obtain real strain values corrected by all monitoring points of the first group of monitoring groups, accurate strain values corrected by all monitoring points are obtained by the other monitoring groups in a similar way, and a real well wall full-depth strain field is constructed by a conventional Kriging interpolation method.

Description

Method for monitoring vertical deformation of vertical shaft wall of overall collaborative local Technical Field The invention belongs to the technical field of borehole wall deformation monitoring, and particularly relates to a method for monitoring the vertical deformation of a borehole wall of a vertical shaft in a total collaborative and local manner. Background The number of deep surface soil vertical shafts in service is considerable. In these vertical shafts, because the stratum load such as the additional force of stratum acting on the outer wall of the shaft presents a continuous development situation, the vertical strain of the well wall is continuously increased, so that the vertical strain of the well wall is generally subjected to remarkable risks of cracking or even multiple cracking. Because the stratum around the shaft is complicated in change along the well depth, and the water loss position of the stratum around the shaft is uncertain along with the increase of construction activities around the mine in recent years, the well wall fracture position also presents diversified situations, so that the vertical strain value and the distribution of the well wall of the vertical shaft are required to be accurately mastered for reasonably judging the well wall fracture risk, and the method has important guiding significance for judging the safety condition of the vertical shaft, preventing the fracture of the inner wall of the shaft and making treatment measures. According to the deformation information characteristics of the well wall, the existing deformation monitoring technology is mainly divided into two types, namely an integral type and a local type. The integrated type is provided with a traditional large-scale displacement meter and a novel laser ranging technology, particularly the novel laser ranging technology can range in hundreds of meters to achieve millimeter-level ranging precision, is quite suitable for overall vertical deformation measurement of a shaft, but cannot obtain shaft deformation conditions at different depth positions, and can be divided into two types, namely a single-point type sensor and a near-continuous distributed strain optical fiber. Single-point sensors are typically embedded in a select few key locations, which have the advantages of tight coupling of the sensor to the borehole wall, good stability, and accurate and reliable measurement data. However, the sensors are difficult to be arranged in a large quantity, the measuring points are sparse, the complete vertical strain information of the well wall cannot be obtained, and the full-depth deformation state of the well shaft structure is difficult to be comprehensively reflected. The near-continuous distributed strain optical fiber has two layout modes, one is fixed on the surface of the inner wall of the well wall, and has the main advantages of convenient construction, but has the defects that the surface fixation is easily influenced by the environmental factors such as underground moisture, temperature change, lifting vibration and the like, the tiny looseness which is difficult to avoid can cause obvious errors of deformation measurement results, and the other is buried in the concrete of the well wall, but the technical difficulties that the adverse effect of grooving construction on the structure of the well wall is reduced to the greatest extent, the grouting quality of a miniature vertical long groove is ensured and the like are overcome. Disclosure of Invention The invention aims to provide a method for monitoring vertical deformation of a vertical shaft wall in a general cooperative local mode, which can realize high-precision, near-continuous and high-cost-performance vertical strain monitoring of the vertical shaft wall and can accurately position a potential fracture area. In order to achieve the purpose, the invention provides a method for monitoring vertical deformation of a vertical shaft wall in a total cooperative local mode, which comprises the following steps: s1, a vertical micro-groove is formed along the full depth of a well wall, a plurality of sensing optical fibers are distributed at equal intervals in the circumferential direction, and monitoring points are distributed on each sensing optical fiber at equal intervals; S2, burying the sensing optical fiber in the micro groove by using a filling material; S3, data acquisition of sensing optical fibers is automatically acquired by using a cabinet-type dense distributed demodulator; S4, introducing a high-precision laser ranging system for collaborative monitoring, wherein the high-precision laser ranging system layout method comprises the following steps: arranging laser reflection targets at initial monitoring points at the top end of sensing optical fibers according to the number of the sensing optical fibers, and correspondingly arranging laser range finders at the tail monitoring points at the bottom end of the sensing optical fi