Triaxial mechanical test device and method capable of simulating formation condition of deep-buried artificial frozen soil

Abstract

The invention discloses a triaxial mechanical test device and method capable of simulating a formation condition of deep-buried artificial frozen soil. The device comprises a main body loading system,a freezing system and a sample testing system. In the main body loading system, a flange plate, a pressure bearing cylinder and a chassis form a pressure bearing shell, and the pressure bearing shellis provided with an outlet pipe and connected with an external existing hydraulic source. The freezing system is composed of a side wall freezing solution circulation channel and a bottom freezing solution circulation channel which are connected with an external existing cold source separately. In the sample testing system, an optical fiber sensor string pre-embedded in a sample is connected withan existing testing instrument and used for monitoring temperature and strain. The triaxial mechanical test device is matched with the existing servo control hydraulic source, the low-temperature cold source and the testing instrument or matched with an existing triaxial servo mechanical test machine (system), the formation condition of the deep-buried artificial frozen soil can be simulated, long-time high-pressure triaxial solidification of a soil sample is completed under the state of simulating original ground strain at first, then the soil sample is frozen under the pressure condition toform a frozen soil sample, and a triaxial mechanical test for the frozen soil sample is conducted.

Description

technical field [0001] The invention relates to the technical field of deep frozen soil mechanics and testing, in particular to a triaxial mechanical testing device capable of simulating the formation conditions of deep buried artificial frozen soil. The present invention cooperates with the existing servo-controlled hydraulic source, low-temperature cold source and testing instrument, or cooperates with the existing three-axis servo mechanical testing machine (system), and can simulate the formation conditions of deep-buried artificial frozen soil to carry out the three-axis mechanical test of frozen soil samples . Background technique [0002] The freezing method is one of the most important methods for constructing a wellbore through deep soil layers. The theory of frozen wall design is one of the cores of freezing drilling technology. The mechanical properties of in-situ frozen artificial frozen soil are an important basis for designing frozen walls. [0003] In recen...

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Problems solved by technology

The conditions for the formation of this kind of frozen soil samples are seriously inconsistent with the actual conditions of deep-buried artificial frozen soil frozen under high original stress conditions.

Although the second approach can simulate the formation conditions of deep-buried artificial frozen soil, the whole process is completed on a three-axis servo mechanical testing machine, which needs to occupy the testing machine for several days to several months. The test time is long and the testing machine is expensive. Carry out mechanical tests on a large number of deep-buried artificial frozen soil samples

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