Triaxial experimental device for accurately simulating dynamic impact compression of rock-soil body

Abstract

The invention relates to the technical field of rock-soil body dynamic impact compression, and aims to provide a triaxial experimental device for accurately simulating dynamic impact compression of arock-soil body. The triaxial experimental deviceis capable of carrying out multi-field coupling of a temperature field, a seepage field and a stress field, simultaneously applying axial pressure, confining pressure, water pressure and temperature pressure, and conducting multi-field dynamic mechanical property experiments under the action of different impact disturbance loads. According to the triaxial experimental device provided by the invention, under-pressure hydraulic oil acts on the outer ring of a dumbbell-type confining pressure ring, so that the dumbbell-type confining pressure ring tightly wraps a rock-soil body sample to form confining pressure; a hydraulic axial pressure expansion piece drives a dynamic impact transmission rod to move forwards to press a rock-soil body sample together with a dynamic impact incident rod with the fixed position to form axial pressure, and a dynamic triaxial stress field is formed under the combined action of the axial pressure and the confining pressure; and pressurized purified water is heated and filled around a rock-soil body sample to form a seepage field and a temperature field.

Description

technical field [0001] The invention relates to the technical field of dynamic impact compression of rock and soil, in particular to a triaxial experimental device for accurately simulating dynamic impact compression of rock and soil. Background technique [0002] Thermal-water-mechanical coupling is a physical process of the interaction of temperature field (heat), seepage field (water), and stress field (force) in rock and soil, and is a multi-physics field that widely exists in rock and soil. coupling phenomenon. The rock and soil mass is a complex heterogeneous mixture composed of various mineral particles. When heat exists inside the rock and soil mass, various mineral particles will exhibit thermal expansion anisotropy during the heating process, resulting in thermal stress and causing rock and soil mass thermal cracking; water exists in all kinds of rock and soil, and all kinds of rock and soil have cracks, and water exists in rock and soil with cracks to form osmoti...

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Problems solved by technology

However, the existing research is mainly to carry out static indoor uniaxial and triaxial tests, numerical simulation tests, and physical simulation tests under the action of a single temperature field, seepage field, and stress field, which cannot truly reflect the occurrence of rock and soil. Dynamic mechanical properties, there is no systematic laboratory research on the dynamic impact compression characteristics of triaxial rock and soil under the coupled effects of temperature field, seepage field, and stress field, and there is no research and development of triaxial dynamic impact with multi-field coupling of temperature field, seepage field, and stress field experimental device

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