Multifunctional tester for anti-seismic property of rockfill material of high rockfill dam

Abstract

The invention discloses a multifunctional tester for the anti-seismic property of a rockfill material of a high rockfill dam. The multifunctional tester comprises a lower pressure plate (1), a pressure chamber base (2), a pressure chamber (8), a support (10), an upper pressure plate (11), a pressure water volume self-balancing device (12), a loading rod (15), a guide sealing sleeve (16) and a rigid connection rod (25). The multifunctional tester for the anti-seismic property of the rockfill material of the high rockfill dam is capable of studying the scale effect of rockfill material dynamic property on the same device, effectively avoiding influence on test results by system errors between different devices, basically eliminating system deformation caused due to insufficient system rigidity and a gap between a sealant tape and a mechanical rotation mechanism, and realizing precise measurement in a dynamic changing process of volume deformation of rockfill material samples under high-frequency cyclic loadings.

Description

technical field [0001] The invention belongs to the technical field of test devices, and relates to an anti-seismic performance testing device for rockfill materials for high earth-rock dams, in particular to a multifunctional tester for the anti-seismic characteristics of rock-fill materials for high earth-rock dams. It is especially suitable for measuring the dynamic mechanical properties of rockfill materials under seismic loads. It also has the function of conducting research on the dynamic scaling effect of rockfill materials for high earth-rock dams and the rheological and wetting tests after earthquakes. Background technique [0002] Rockfill material is the main material for building high earth-rockfill dams, and its strength and deformation characteristics under earthquakes directly affect the seismic safety of high earth-rockfill dams. Therefore, it is important to develop test equipment that can accurately test the strength and deformation indicators of rockfill ma...

AI Technical Summary

Problems solved by technology

[0004] (1) The impact of the scaling effect of rockfill materials on its dynamic strength denaturation characteristics cannot be reasonably considered

With the improvement of construction level and rolling process, the maximum particle size of rockfill material has reached 1200mm. The maximum particle size allowed by the test equipment commonly used at home and abroad is usually only 60mm, which needs to be scaled down. At present, different methods are usually used. The experimental equipment is used to test and study the scale effect, and the systematic error between different equipment will affect the accuracy of the test results

[0005] (2) It is difficult to take into account the measurement and control accuracy of the strength and deformation characteristics of rockfill materials under high stress and low stress states

The earthquake damage investigation of high earth-rockfill dams shows that earthquakes often lead to damage to low-stress parts such as the dam crest and the shallow surface of the dam body. Therefore, it is particularly important to study the strength and deformation characteristics of rockfill materials under low-stress conditions. The existing instruments are In pursuit of high stress state test requirements for rockfill materials of high earth-rockfill dams, the pressure sensors have a large range, resulting in poor test accuracy under low stress state (confining pressure ≤ 50kPa), and generally only can be tested for samples with confining pressure ≥ 150kPa

[0006] (3) The error of the deformation test result is relatively large

The deformation of rockfill samples measured by existing instruments and equipment includes large system deformations caused by insufficient rigidity of the system, gaps between sealing rubber strips and mechanical rotating mechanisms, etc.

[0007] (4) The rheological and wetting deformation characteristics of rockfill materials after being subjected to earthquake loads cannot be carried out

[0008] Therefore, it is necessary to study the rheological and wetting deformation characteristics of rockfill materials subjected to seismic loads, but existing instruments do not have this function

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