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首页> 外文会议>International Symposium on Geotechnical Measurements and Modelling; Sep 23-25, 2003; Karlsruhe, Germany >Development of an excavation disturbed zone in claystone (Opalinus Clay)
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Development of an excavation disturbed zone in claystone (Opalinus Clay)

机译：粘土岩（Opalinus粘土）中开挖扰动带的发育

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摘要

Nagra has conducted a feasibility study for a potential deep geological repository for radioactive waste in the Opalinus Clay, a Jurassic claystone in Northern Switzerland. As part of these studies, the rock mechanical behaviour of the Opalinus Clay was investigated. The Opalinus Clay is a transversely isotropic soft rock (or stiff clay) and shows a remarkable dependence of the rock mechanical parameters on water content. A modified Mohr-Coulomb model was calibrated with data from laboratory tests and verified by comparing modelling results with data from a mine-by-test carried out at the rock laboratory at Mont Terri. The modelling results demonstrate that the excavation disturbed zone (EDZ) is mainly influenced by the anisotropy of the rock. The geometry of the EDZ is controlled by the instantaneous ground reaction (undrained elasto-plastic behavior) during excavation. Studies of long-term development showed the influence of compaction/de-compaction, creep processes and swelling of the host rock and demonstrated the self-sealing capacity of the Opalinus Clay.
机译：纳格拉（Nagra）已对瑞士北部侏罗系粘土石Opalinus粘土中潜在的放射性废物深层地质处置库进行了可行性研究。作为这些研究的一部分，对蛋白石粘土的岩石力学行为进行了研究。 Opalinus粘土是横向各向同性的软岩（或硬质粘土），并且显示出岩石力学参数对含水量的显着依赖性。修改后的Mohr-Coulomb模型使用实验室测试的数据进行了校准，并通过将建模结果与在蒙特里（Mont Terri）岩石实验室进行的逐项测试的数据进行比较来进行验证。模拟结果表明，开挖扰动带（EDZ）主要受岩石各向异性的影响。 EDZ的几何形状受开挖过程中的瞬时地面反应（不排水的弹塑性行为）控制。长期发展的研究表明压实/解压，蠕变过程和基质岩石的膨胀的影响，并证明了蛋白石粘土的自密封能力。

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