Gravity dam body crack advanced warning method based on microearthquake monitoring
A microseismic monitoring and gravity dam technology, applied in the field of geotechnical engineering, can solve problems such as the inability of hydropower station construction and operation and maintenance personnel to give early warning, and the inability to identify dam micro-crack information, so as to ensure the safety of construction and operation
Inactive Publication Date: 2018-12-14
SICHUAN UNIV
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Problems solved by technology
Although the operation of these methods is relatively simple, they can only observe the deformation information after the dam body has been damaged, and can only show whether the dam itself is damaged with macroscopic data, and cannot identify the potential micro-cracks of the dam itself information, and it is impossible to give early warning to hydropower station construction and operation and maintenance personnel before the dam is damaged
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Embodiment 1
[0039] This embodiment takes a gravity dam of a large-scale hydropower station as an example to specifically describe the method for early warning of gravity dam cracks based on microseismic monitoring. The cross section of the gravity dam is shown in figure 1 As mentioned above, the center of the gravity dam body is provided with a traffic inspection corridor and a grouting corridor.
[0040] The microseismic monitoring system adopted in this embodiment is the ESG microseismic monitoring system (ESG Corporation of Canada). host part of the system). The network topology of the ESG microseismic monitoring system is as follows: figure 2 As shown, each acceleration sensor is connected to the Paladin digital signal acquisition system through cables, and the Paladin digital signal acquisition system is connected to the Hyperion digital signal processing system through a network cable. Central computer connection. The sensitivity of the sensor is 30V / g, and the frequency respon...
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The invention provides a gravity dam body crack advanced warning method based on microearthquake monitoring. The method is characterized by comprising the steps that (1) a monitoring region is delineated, and sensors and blastholes are arranged; (2) blasting is performed in each blasthole at different time points, a take-off moment of an elastic wave generated in each blast is recorded, and the average equivalent wave velocity of a rock mass is calculated; and (3) the monitoring region is monitored through a microearthquake monitoring system, a focus position and a microearthquake occurrence moment of a microearthquake event generated in the monitoring region are measured, a focus position spatial distribution map is made, and when the focus position of the microearthquake event gathers ina certain local region or some local regions of the monitoring region and is in strip or plane distribution, a gravity dam body crack warning signal is sent out. Through the method, the risk that a gravity dam body generates a crack can be recognized in advance, and therefore safe construction and safe operation of a hydropower station can be better guaranteed.
Description
technical field [0001] The invention belongs to the field of geotechnical engineering, and relates to a method for early warning of gravity dam cracks based on microseismic monitoring. Background technique [0002] A hydropower station is a comprehensive engineering facility that converts water energy into electrical energy. The hub of a hydropower station includes water-retaining structures, water-discharging structures, water-intake structures, water-diversion structures, water-leveling structures, and plant hub buildings, among which water-retaining structures And the hub of the plant is an important part of the hydropower station. According to statistics, most of the hydropower station accidents at home and abroad are accidents of water-blocking structures, that is, there are problems in the water-blocking dam system. The types of water blocking dams include concrete gravity dams, arch dams, earth-rock dams, rockfill dams, and river gates. Gravity dam, as a dam with go...
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IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/646G01V2210/642
Inventor 徐奴文董林鹭周家文戴峰肖明砾樊义林谭尧升
Owner SICHUAN UNIV