Full-graduation concrete fracture expanding test testing machine under action of high water pressure and mobile load

Abstract

The invention discloses a full-graduation concrete fracture expanding test testing machine under the action of high water pressure and mobile load. The full-graduation concrete fracture expanding test testing machine comprises an MTS testing machine actuation head A, a wedge-shaped loading frame, a neodymium iron boron rare earth permanent magnet, a pressure pulling force transmission steel shaft, a pre-burying bearing, a pressure pulling support piece, a sample support steel bar, a high pressure seal cylinder, a sealing cylinder cover plate, a sealing cylinder connecting rod, a non-contacting type optical measurement window and a high water pressure pump, wherein a wedge-shaped loading frame on which the neodymium iron boron rare earth permanent magnet is fixed, the pressure pulling force transmission steel shaft and the pressure pulling support piece form a closed magnetic field loop; and a dynamic loading part, a supporting part, a high pressure seal cavity part and the high water pressure pump jointly form the testing machine. The full-graduation concrete fracture expanding test testing machine provided by the invention can test crack initiation, extension and unstability processes of the water conservancy projection structure full-graduation concrete fracture under the action of high pressure and mobile load, overcome the defects that the existing testing machine only can perform a full-graduation concrete fracture expanding test under anhydrous pressure or hydrostatic pressure, the high water pressure and the mobile load can not be simultaneously applied and a concrete fracture expanding process can not be tested; and the full graduation concrete fracture expanding test testing machine provided by the invention has the characteristics that the structural design is simple, and the test function is various and the testing process is stable and controllable.

Description

technical field [0001] The invention mainly relates to a concrete fracture expansion testing machine, in particular to a full-graded concrete fracture expansion testing machine suitable for high water pressure and dynamic load. Background technique [0002] In traditional concrete dam structure design, generally only water pressure, self-weight load, uplift pressure, sediment pressure, wind wave pressure, ice pressure, and seismic load are considered. In fact, for concrete dams that are prone to cracks, it is not enough to only consider the above loads. The impact of water loads in cracks on the dam cannot be ignored. Especially with the improvement of dam construction technology, many 300-meter-level High concrete dams, most of these high concrete dams are located in areas with high seismic intensity, and under the pressure of deep water, after years of operation, cracks have appeared to varying degrees, and some dams even have various cracks during the construction period....

AI Technical Summary

Problems solved by technology

The former can only test the hydrostatic pressure when the concrete is not split, and only the static load can be applied on the specimen. After the splitting test is completed, the cylindrical specimen can be cut to observe the final crack expansion, but the crack growth process cannot be tested; while the latter It can test the change of water pressure in the crack under different static load adjustments, and the influence of hydrostatic pressure on fracture performance under the joint action of static load and water pressure, but it is difficult to apply high water pressure and test the crack expansion process

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