Low temperature-seepage coupling dynamic impact compression experiment device for frozen rock-soil body

Abstract

The invention discloses a low temperature- seepage coupling dynamic impact compression experiment device for a frozen rock-soil body. Dynamic impact compression mechanical experiments are carried outon various freezing damage characteristics of the frozen rock-soil body in different low-temperature temperature field and seepage field coupling environments. The device comprises a rock-soil body sample, a bracket system, a freezing system, a hydraulic load and storage system, a dynamic impact system and a comprehensive control system. The bracket system comprises an L-shaped ring type flange, aload protection sleeve, a fastening bolt, a stabilizing support, a horizontal fixing frame and a foundation, the L-shaped ring type flange is connected with the load protection sleeve, and the bottomof the load protection sleeve is welded to the horizontal fixing frame; the horizontal fixing frame is in threaded connection with the foundation; the freezing system comprises a circular ring type freezing system, a liquid nitrogen pipeline system, liquid nitrogen, a liquid nitrogen storage tank and a liquid nitrogen flow pressure system; the circular ring type freezing system is a hollow cylindrical structure; and the rock-soil body sample is arranged in the center of the interior of the circular ring type freezing cavity system and is in a cylinder shape.

Description

technical field [0001] The application belongs to the technical field of dynamic impact compression of frozen rock and soil mass. Background technique [0002] The freezing damage caused by low-temperature freezing of rock and soil not only involves the freezing expansion damage of rock and soil, but also involves the multi-field coupling of temperature field and seepage field in low temperature environment, which seriously threatens the safety and stability of artificial freezing engineering and rock and soil engineering in cold regions. . In particular, the artificial freezing method is widely used in the construction of subway communication passages. The low temperature-seepage coupling characteristics of rock and soil, as well as freezing temperature, freezing thickness, frost heaving pressure, and engineering disturbance are important prerequisites for ensuring the safety of construction projects. During the artificial freezing process, when fissure water exists inside...

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Problems solved by technology

In the actual excavation environment of artificially frozen rock and soil engineering, it is an environmental field coupled with multiple fields of temperature field and seepage field, and it is also a dynamic impact disturbance process. Construction loads, vehicle loads, artificial excavation loads and other dynamic load disturbances, and the existing research is mainly to carry out static indoor uniaxial and triaxial tests, numerical simulation tests and physical simulations under the action of a single low-temperature temperature field and seepage field Experiments, etc., cannot truly reflect the dynamic mechanical properties of rock and soil in the environment where the rock and soil occur. Field multi-field coupling freeze dynamic shock experimental device

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