Distributed optical fiber sensing monitoring based dam seepage analog apparatus

Abstract

The invention relates to a simulator based on the distributed optical fiber sensation to detect dam seepage, wherein it comprises: optical fiber sensing demodulator, sensing optical cable embedded into the dam model media inside the box; and the dam seepage simulating controlling unit around the sensing optical cable which mainly comprises a main transmitting tube and several branch transmitting tubes inserted into the box; the end of branch transmitting tube has media filter network and temperature humidity sensor; the mina transmitting tube has flux control valve; the bottom of box has movable bottom plate; therefore, it can simulate the detection on the dam seepage. And it can be used to search the dam seepage or be used as experiment equipment.

Description

technical field [0001] The invention relates to a simulation device, in particular to a simulation device for monitoring dam seepage based on distributed optical fiber sensing. Background technique [0002] Leakage and piping are the main causes of embankment damage and collapse. Monitoring the temperature inside the embankment is an effective means to detect and identify embankment seepage and leakage. In particular, the distributed optical fiber temperature sensing system developed in recent years can measure tens of kilometers The temperature along the length realizes long-term continuous monitoring with a spatial resolution of 1 meter, and can be accurately positioned, especially suitable for monitoring river embankments, reservoir dams, etc. At present, there are three main types of objects monitored by distributed optical fiber temperature sensing systems at home and abroad: the first type is the leakage of pipelines, the second type is cables in power plants or substa...

AI Technical Summary

Problems solved by technology

If the actual dam is selected for field test, there will be the following serious deficiencies: the seepage and leakage of the dam are a slow process from occurrence to development, and piping will only be formed when it is serious, and it is not suitable for long-term monitoring on the spot during the scientific research test period. It is realistic and difficult; it is not easy to find the dam section where leakage occurs or will occur; once the optical cable used for the test is buried in the dam, it cannot be easily taken out, and the optical cable needs to be re-laid when replacing the dam section, which is expensive; for the same seepage The process cannot be repeated; the distance between the seepage and the optical cable cannot be selected arbitrarily, which is not conducive to the study of the influence of the distance between the optical cable and the seepage occurrence point on the test signal

Publication No. CN1632496A is a Chinese invention patent application for a distributed optical fiber temperature sensing device and method for dam leakage location, which discloses the use of bidirectional couplers, wavelength division multiplexers, avalanche diodes, main amplifiers, sampling averagers and A signal acquisition and processing system composed of a computer, a driver, and a laser diode component sensing optical cable. This device is to deploy an optical cable on a real embankment to monitor whether the seepage occurs in the embankment and the location of the seepage point depends on the software system. It cannot detect the seepage in a short time. It is not convenient to change the test object quickly, and it is not convenient to change the installation method after the installation is completed, so it cannot be used for experimental research well.

The Chinese Utility Model Patent Publication No. CN200320127902.9 discloses a layered mesh isobaric plate and a seepage simulation experimental device. The layered mesh isobaric plate is composed of a skeleton mesh layer and a sand-proof mesh layer, which only provides some technical measures for simulating seepage, not a complete set of simulation device , and cannot simulate the situation of single-point seepage, and does not have distributed monitoring capabilities

Images