CN-122016594-A - Dam abutment slope seepage monitoring system and method based on distributed temperature sensing optical cable

CN122016594ACN 122016594 ACN122016594 ACN 122016594ACN-122016594-A

Abstract

The invention discloses a dam abutment slope seepage monitoring system and method based on a distributed temperature sensing optical cable, comprising the steps of utilizing the distributed temperature sensing optical cable to monitor and obtain temperature data distributed along the distributed temperature sensing optical cable in real time; the temperature data of the uncovered area of the distributed temperature sensing optical cable is obtained by utilizing a Kriging interpolation method, a two-dimensional temperature distribution field is formed by the temperature data distributed along the distributed temperature sensing optical cable and the temperature data of the uncovered area of the distributed temperature sensing optical cable, when the difference value between the average temperature of each temperature monitoring point in the two-dimensional temperature distribution field and the average temperature of the temperature monitoring points in the set area around the temperature monitoring point continuously exceeds a preset threshold value, the temperature monitoring point is judged to have a seepage phenomenon, or the temperature residual error is obtained by making the difference between the real-time monitoring temperature of each temperature monitoring point and the temperature of the corresponding temperature monitoring point in a dynamic reference temperature model, and whether the seepage phenomenon exists in the corresponding single temperature monitoring point is judged according to the temperature residual error.

Inventors

LI ZHENGYING
GUI XIN
LIU XIAO
HE BO
DONG HAONAN
CAO CHENGZHONG
Xia Yundong
ZHANG HONGCHAO

Assignees

武汉理工大学
贵州省水利投资(集团)有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260120

Claims (10)

1. Dam abutment slope seepage monitoring system based on distributed temperature sensing optical cable, which is characterized by comprising: The temperature monitoring module is used for monitoring temperature data in the dam slope monitoring area in real time by using distributed temperature sensing optical cables arranged in the dam slope monitoring area according to a preset route, so as to obtain temperature data of temperature monitoring points distributed along the distributed temperature sensing optical cables; the data reconstruction module is used for obtaining temperature data of temperature monitoring points of an uncovered area of the distributed temperature sensing optical cable in the dam slope monitoring area by utilizing a kriging interpolation method according to the temperature data of the temperature monitoring points distributed along the distributed temperature sensing optical cable, and the temperature data of the temperature monitoring points distributed along the distributed temperature sensing optical cable and the temperature data of the temperature monitoring points of the uncovered area of the distributed temperature sensing optical cable form a two-dimensional temperature distribution field of the dam slope; The anomaly analysis module is used for calculating the difference value between the average temperature of each temperature monitoring point in the two-dimensional temperature distribution field of the dam slope and the average temperature of the temperature monitoring points in the set area around the temperature monitoring points, and judging that the temperature monitoring points have seepage phenomenon when the difference value continuously exceeds a preset threshold value; Or establishing a dynamic reference temperature model according to the temperature change of each temperature monitoring point in the two-dimensional temperature distribution field of the dam slope at different moments by using a multiple average method, and obtaining a temperature residual error by differentiating the real-time monitoring temperature of each temperature monitoring point with the temperature of the corresponding temperature monitoring point in the dynamic reference temperature model, and judging whether the seepage phenomenon exists in the corresponding single temperature monitoring point according to the temperature residual error.
2. The dam abutment slope seepage monitoring system based on the distributed temperature sensing optical cable according to claim 1, wherein the distributed temperature sensing optical cable is fixed inside a contact surface of a dam abutment rock mass and concrete of the dam abutment slope through a clamp according to a Z-shaped layout path, and turning points of the distributed temperature sensing optical cable along the Z-shaped layout path are fixed on edges of the dam abutment slope.
3. The dam abutment slope seepage monitoring system based on the distributed temperature sensing optical cable according to claim 2, wherein the method for obtaining the temperature data of the temperature monitoring points of the uncovered area of the distributed temperature sensing optical cable in the dam abutment slope monitoring area by utilizing the Kriging interpolation method according to the temperature data of the temperature monitoring points distributed along the distributed temperature sensing optical cable comprises the following steps: , ; Wherein (x i , y i ) is the spatial coordinate of the i th temperature monitoring point distributed along the distributed temperature sensing optical cable, T (x i , y i ) is the temperature of the i th temperature monitoring point distributed along the distributed temperature sensing optical cable, For spatial coordinates determined from spatial correlation assigned to i th temperature monitoring point distributed along distributed temperature sensing cable T (x 0 , y 0 ) is the temperature value of the temperature monitoring points (x 0 , y 0 ) of the uncovered area of the distributed temperature sensing optical cable, and N is the total number of the temperature monitoring points distributed along the distributed temperature sensing optical cable.
4. The dam abutment slope seepage monitoring system based on the distributed temperature sensing optical cable according to claim 3, wherein the temperature data of the temperature monitoring points distributed along the distributed temperature sensing optical cable are one-dimensional discrete data points, the temperature data comprise the meter number L i of the distributed temperature sensing optical cable and the temperature value T L of the distributed temperature sensing optical cable at the meter number L i , and the space coordinates of the temperature monitoring points are obtained through engineering mapping and space modeling according to the distribution path of the distributed temperature sensing optical cable, the temperature data of the temperature monitoring points distributed along the distributed temperature sensing optical cable and the area of the dam abutment slope monitoring area.
5. The dam abutment slope seepage monitoring system based on the distributed temperature sensing optical cable according to claim 3, wherein the method for calculating the difference value between each temperature monitoring point in the two-dimensional temperature distribution field of the dam abutment slope and the average temperature of the temperature monitoring points in the set area around the temperature monitoring point comprises the following steps: ; Wherein, the The difference between the average temperature of the adjacent area is set for the single temperature monitoring point at the time t and the periphery of the temperature monitoring point, The temperature of a single temperature monitoring point at the moment t in a two-dimensional temperature distribution field of a dam slope, And setting average temperature of adjacent areas for the periphery of the single temperature monitoring point in the two-dimensional temperature distribution field of the dam slope.
6. The dam abutment slope seepage monitoring system based on the distributed temperature sensing optical cable according to claim 3, wherein the method for establishing the dynamic reference temperature model according to the temperature change of each temperature monitoring point in the dam abutment slope two-dimensional temperature distribution field at different moments by utilizing a multiple average method comprises the steps of aligning time axes of temperature data of each temperature monitoring point of a plurality of continuous historical periods, calculating temperature data average values of a plurality of historical temperature monitoring points of the same period time phase point and the same temperature monitoring point in the plurality of historical periods, and forming the dynamic reference temperature model by the temperature data average values of the plurality of historical temperature monitoring points corresponding to each period time phase point in one period.
7. The dam abutment slope seepage monitoring system based on the distributed temperature sensing optical cable according to claim 6, wherein the method for obtaining the temperature residual error by differentiating the real-time monitoring temperature of each temperature monitoring point and the temperature of the corresponding temperature monitoring point in the dynamic reference temperature model comprises the following steps: ; Wherein, the For the temperature residual at the moment of a single temperature monitoring point t, For the temperature at the moment of the single temperature monitoring point t, The temperature at time t in the dynamic reference temperature model is the temperature of the single temperature monitoring point.
8. The dam abutment slope seepage monitoring system based on the distributed temperature sensing optical cable according to claim 7, wherein the method for judging whether seepage phenomenon exists at the corresponding single temperature monitoring point according to the temperature residual error comprises the following steps: setting a preset non-periodic fluctuation threshold Absolute value of the real-time temperature residual Exceeding a preset threshold of non-periodic wave overactivity When the temperature residual error is detected, the seepage phenomenon of the corresponding single temperature monitoring point is judged, and the change rate of the temperature residual error along with time is calculated in real time , Is a partial differential sign and will With a preset threshold value of the sudden deviation change rate Comparing, when absolute value of rate of change of temperature residual error with time Exceeding a preset threshold value for the rate of sudden deviation change Judging that seepage occurs at a corresponding single temperature monitoring point when the absolute value of the temperature residual error is continuously larger than a preset continuous deviation amplitude threshold value And the duration exceeds a preset duration window threshold And judging that seepage occurs at the corresponding single temperature monitoring point.
9. A method of dam abutment slope seepage monitoring based on distributed temperature sensing optical cable according to claim 1, comprising: The temperature data in the dam slope monitoring area is monitored in real time by using distributed temperature sensing optical cables which are arranged in the dam slope monitoring area according to a preset route, and the temperature data of temperature monitoring points distributed along the distributed temperature sensing optical cables are obtained; obtaining temperature data of temperature monitoring points of an uncovered area of the distributed temperature sensing optical cable in a dam slope monitoring area by utilizing a Kriging interpolation method according to the temperature data of the temperature monitoring points distributed along the distributed temperature sensing optical cable, wherein the temperature data of the temperature monitoring points distributed along the distributed temperature sensing optical cable and the temperature data of the temperature monitoring points of the uncovered area of the distributed temperature sensing optical cable form a two-dimensional temperature distribution field of the dam slope; Calculating the difference value between the average temperature of each temperature monitoring point in the two-dimensional temperature distribution field of the dam slope and the average temperature of the temperature monitoring points in the set area around the temperature monitoring points, and judging that the temperature monitoring points have seepage phenomenon when the difference value continuously exceeds a preset threshold value; Or establishing a dynamic reference temperature model according to the temperature change of each temperature monitoring point in the two-dimensional temperature distribution field of the dam slope at different moments by using a multiple average method, and obtaining a temperature residual error by differentiating the real-time monitoring temperature of each temperature monitoring point with the temperature of the corresponding temperature monitoring point in the dynamic reference temperature model, and judging whether the seepage phenomenon exists in the corresponding single temperature monitoring point according to the temperature residual error.
10. A computer program product comprising a computer program, characterized in that the computer program realizes the steps of the method as claimed in claim 9 when being executed by a processor.

Description

Dam abutment slope seepage monitoring system and method based on distributed temperature sensing optical cable Technical Field The invention relates to the field of dam safety monitoring, in particular to a dam abutment slope seepage monitoring system and method based on a distributed temperature sensing optical cable. Background The dam abutment slope is used as a key connecting part between the dam and the mountain bodies on two sides, and the stability and the operation safety of the integral structure of the dam are directly affected. The natural mountain where the dam slope is located is not uniform and complete, and various geological defects, such as porous rock stratum, fault and joint fracture network, naturally exist, so that the dam slope is provided with a seepage initiation and expansion foundation. Meanwhile, during the dam slope excavation process, the rock mass can be unloaded and loosened towards the temporary surface, so that the originally closed joint cracks are opened and deformed, even new tension cracks are formed, and the permeability of the rock mass is increased. Because the rock mass of the concrete dam and the rock mass of the dam abutment slope have obvious differences in mechanical parameters such as rigidity, elastic modulus and the like, the concrete dam and the rock mass generate asynchronous deformation under the action of long-term stress, and further induce cracks on a contact surface to provide a conduction path for seepage. The continuous seepage flow not only can increase the pore water pressure of the rock mass and reduce the shear strength of the rock soil, but also can enlarge the seepage flow channel through the scouring of water flow, thereby seriously threatening the stability of the dam abutment slope and forming a great hidden trouble of the safe operation of the dam. At present, the seepage monitoring technology mainly comprises point-type sensor monitoring and downstream seepage statistics, but the methods have obvious limitations. Although pore water pressure measurement of a mounting point can be realized by the point type sensor such as an osmometer, in practical application, the measuring points are in sparse point type distribution, the whole area of a monitoring area is difficult to cover, a monitoring blind area exists, effective signal capturing and positioning capability is not available for seepage in a sprouting stage and with small seepage, and a complete space path of a seepage channel is difficult to accurately invert. The seepage monitoring method implemented by the water measuring weir and other devices can only quantitatively count the total seepage collected at the downstream designated monitoring section, and can reflect the overall change trend of seepage, but can not provide specific position information of seepage occurrence at all. Aiming at the inherent defects of the monitoring technology in measuring point density, space coverage and seepage positioning precision, a novel monitoring method capable of realizing global high-density monitoring of a dam abutment slope and accurately positioning seepage positions is needed, and reliable technical support is provided for safety prevention and control of the dam abutment slope of a dam. Disclosure of Invention The invention aims to provide a dam abutment slope seepage monitoring system based on a distributed temperature sensing optical cable, and provides a dam abutment slope seepage monitoring method based on the distributed temperature sensing optical cable. In order to achieve the purpose, the dam abutment slope seepage monitoring system based on the distributed temperature sensing optical cable comprises: The temperature monitoring module is used for monitoring temperature data in the dam slope monitoring area in real time by using distributed temperature sensing optical cables arranged in the dam slope monitoring area according to a preset route, so as to obtain temperature data of temperature monitoring points distributed along the distributed temperature sensing optical cables; the data reconstruction module is used for obtaining temperature data of temperature monitoring points of an uncovered area of the distributed temperature sensing optical cable in the dam slope monitoring area by utilizing a kriging interpolation method according to the temperature data of the temperature monitoring points distributed along the distributed temperature sensing optical cable, and the temperature data of the temperature monitoring points distributed along the distributed temperature sensing optical cable and the temperature data of the temperature monitoring points of the uncovered area of the distributed temperature sensing optical cable form a two-dimensional temperature distribution field of the dam slope; The anomaly analysis module is used for calculating the difference value between the average temperature of each temperature monitoring point in the two-dimensional temperature distribution