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Implementation of the strain hardening model into buffer material in high level waste repository

机译：在高水平废物储存库中将菌株硬化模型的实施

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Engineered Barrier System (EBS) primarily provides a protective cover for the High Level Waste (HLW) canisters. In addition, it functions as an efficient hydraulic and chemical barrier system. For in situ disposal applications, the ideal buffer material is bentonite and it is fabricated into blocks to build EBS. Currently, traditional methods introduce significant errors in constitutive modeling of those modeled blocks. In this paper, the particular failure laws and stress-strain laws of bentonite blocks were furnished from a lot of uniaxial and triaxial tests. Also, it showed that the stress-strain relations given by the traditional constitutive relations did not correspond to the failure forms of bentonite specimens in the experiments. On this basis, the relations between internal friction angle, cohesion and plastic strain were analyzed so that a new strain hardening model was established under the framework of Mohr-Coulomb criterion. In the end, a series of 3D computation of HLW disposal were carried out using the software FLAC3D, where the proposed strain hardening model led to satisfactory prediction of the buffer materials.
机译：工程屏障系统（EBS）主要为高级废物（HLW）罐提供保护盖。此外，它还用作高效的液压和化学屏障系统。对于原位处理应用，理想的缓冲材料是膨润土，它是制造成块以构建EBS。目前，传统方法在构图模型中引入了显着的错误。在本文中，膨润土块的特定失败法律和应力 - 菌株法从大量的单轴和三轴试验提供。此外，它表明，传统的本构关系给出的应力 - 应变关系与实验中膨润土标本的失效形式没有对应。在此基础上，分析了内部摩擦角，内聚力和塑性菌株之间的关系，使得在Mohr-Coulomb标准的框架下建立了一种新的应变硬化模型。最后，使用软件FLAC3D进行一系列HLW处理的3D计算，其中所提出的应变硬化模型导致缓冲材料的令人满意的预测。

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