Soft rock filler deterioration test method

Abstract

The invention discloses testing equipment and a test method for soft rock filling deterioration. The testing equipment comprises a three axis instrument and a sample, and further comprises a hot air inlet system, a pumping and exhaust system, a backpressure system and a confining pressure system with external body variable measurement; the hot air inlet system is located at the bottom of the sample, the pumping and exhaust system is located at the top of the sample, the backpressure system is located at the bottom of the sample, the confining pressure system with external body variable measurement is located in a three axis pressure chamber and outside the sample. According to the testing equipment and the test method for soft rock filling deterioration, a deterioration simulation test under different confining pressure conditions is carried out, the relationship between the weathering rate and the confining pressure is established, and the optimum thickness of a protective layer for soft rock filling is determined. Through a three axis degradation simulation test, a three axis shear test for soft rock filling after full deterioration is carried out, the stress-strain relationship,failure bias stress, constitutive parameters and strength parameters and the like under different confining pressures are obtained. According to the mechanical properties of soft rock filling under different compaction degree conditions, the optimum compaction degree of soft rock filling is determined.

Description

technical field The invention belongs to the technical field of geotechnical engineering, and in particular relates to a soft rock filler deterioration test method. Background technique Due to the low particle strength, soft rock filler is prone to breakage. Compared with hard rock, its mechanical nonlinear characteristics are more significant, and its modulus and strength will be attenuated and other degradation phenomena will occur under the long-term dry-wet cycle of water. The existing norms require that the porosity of hard rockfill materials for rolling earth-rockfill dams be 20%-28%. For soft rockfill materials, the porosity should be determined according to the requirements of building deformation, stress and shear strength. For soft rock rockfill materials, considering that soft rock fillers are prone to particle breakage, if the rolling compaction requires a smaller porosity, the block rocks are easily broken into medium and small particle sizes, which will affect ...

AI Technical Summary

Problems solved by technology

For now, there is a lack of scientific soft rock filling material degradation test equipment and test methods in the norms and actual projects to determine these important design and construction parameters

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