Pressing die for meter-scale buffer material circular building block and building block preparation method

Abstract

The invention belongs to the field of preparation of buffer material large building blocks for high-level radioactive waste geological disposal, and particularly relates to a pressing die for a meter-scale buffer material circular building block and a building block preparation method. According to the pressing die, female die seats are semicircular, and the two female die seats form a circular female die; female die linings form a circular lining which is arranged on the inner walls of the female die seats; the female die linings and the female die seats are arranged on a bottom plate; a male die lining plate is arranged at the bottom of a male die seat, and the male die seat and the male die lining plate form an integral male die; a positioning baffle is arranged in a groove of the bottom plate; a bolt hole is processed in the groove, and a pressing plate is placed on the positioning baffle and is fastened through a bolt; and the female die is placed on the bottom plate and is limited through the positioning baffle. According to the pressing die and the preparation method, a buffer material large building block sample with diameter of 1.2-1.6 m, height of 0.2-0.5 m and dry density of 1.4-1.8 g / cm<3> in engineering scale can be pressed, and a raw material basis and a technical support are provided for carrying out an in-situ test of the buffer material in an underground laboratory.

Description

technical field [0001] The invention belongs to the field of large-scale block preparation of cushioning materials for geological disposal of high-level radioactive waste, and in particular relates to a circular block pressing mold for meter-scale buffering materials and a block preparation method. Background technique [0002] my country's high-level radioactive waste adopts a deep geological disposal method, using a multiple barrier system composed of artificial barriers (waste tanks, buffer materials, backfill materials, etc.) and natural barriers (underground rock mass) to block nuclide migration. As the last artificial barrier between the waste tank and the geological body, the buffer material plays an important role in engineering barrier, hydraulic barrier, chemical barrier, conduction and dissipation of radioactive waste decay heat, and is an effective guarantee for the safety and stability of the geological repository. Assure. Domestic and foreign studies have show...

AI Technical Summary

Problems solved by technology

Considering that this type of pressing scheme is no longer suitable for the future 1:1 large-scale indoor and underground laboratory in-situ test requirements in terms of volume and efficiency, there is an urgent need to master a large-scale cushioning material with a meter-scale scale. Block preparation technology and process flow

Images