Simulation test system in variable load fiber strain karst collapse process

Abstract

The invention discloses a simulation test system in a variable load fiber strain karst collapse process. The system comprises a strain gauge and a testing apparatus; the testing apparatus comprises a supporting mechanism, a measuring mechanism and a fiber fixing mechanism, wherein the supporting mechanism comprises a left bracket, a right bracket, an upper bracket and a lower bracket which are connected together to form a square or a rectangle; the measuring mechanism comprises a mechanical dial indicator, a deformed hook and a weight; the fiber fixing mechanism comprises a left side fiber fixing device, a right side fiber fixing device and a fiber; the left side and right side fiber fixing devices are same in structure and comprise movable bases, idler wheels, connecting arms and fasteners for fixing the idler wheels; one end of the fiber is wound on the idler wheel in the left side fiber fixing device and the other end sequentially passes through the deformed hook and then is wound on the idler wheel in the right side fiber fixing device; one end of the fiber is connected to the strain gauge. The test system disclosed by the invention can increase loading point and variable load, so as to meet a karst collapse test for simulating generalized models under different loads.

Description

technical field [0001] The invention relates to the technical field of karst collapse monitoring, in particular to a karst collapse process simulation test system with variable load optical fiber strain. Background technique [0002] my country's karst is widely distributed, accounting for about 1 / 3 of the country's land area. The geological environment in these areas is fragile. With the frequent human activities, the problem of karst geological disasters is becoming more and more prominent, especially the problem of karst collapse, which has become the main geological problem faced by karst areas. one of the disasters. Karst subsidence has the characteristics of random occurrence, hidden formation, and uncertain time and space. Traditional monitoring technology methods are costly, difficult to locate accurately, and limited monitoring range is difficult to meet the needs. Distributed optical fiber sensing technology can realize continuous monitoring of changes in external p...

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Problems solved by technology

Due to the concealment of karst collapse, it is difficult for traditional experimental research methods to effectively study the karst collapse process intuitively. At present, there is no karst collapse process simulation test that can change the load to meet the generalization model under different load conditions. system

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