Effect of montmorillonite content on mechanical and hydraulics properties of bentonite and its numerical modeling
Effect of montmorillonite content on mechanical and hydraulics properties of bentonite and its numerical modeling
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蒙脱石含量对膨润土力学和水力学性能的影响及其数值模拟
DOI：
10.1144/sp400.13
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
and Yahagi,R.
中科院分区：
文献类型：
--
作者：
Takayama,Y.;Tsurumi,S.;Iizuka,A.;Kobayashi,I.;Ohwada,H.;Ishii,T.;and Yahagi,R.
近年来，人们研究了水力/机械/化学（HMC）分析方法，目的是评价铀矿床地质处置库的长期性能。在这项特殊的研究中，水力/力学建模的膨润土材料的HMC分析进行了研究，膨润土材料被认为是工程屏障。据说，在TRU处置设施中的膨润土材料被水泥沥滤液化学改变。此外，还存在化学蚀变改变膨润土材料的膨胀特性和透水性的问题。本文利用以往的试验结果，研究了蒙脱石含量和钠、钙离子交换对粘土力学和水力学特性的影响。水力/机械数学建模，描述了膨润土的力学行为，从最初的不饱和状态，同时也考虑到上述膨润土的水力和机械特性。我们还模拟了饱和过程，从最初的不饱和状态在一个TRU处置设施，这是一维建模。
Recently, the hydraulic/mechanical/chemical (HMC) analytical method has been studied with the aim of evaluating the long-term performance of Trans-Uranium (TRU) geological repositories. In this particular research, the hydraulic/mechanical modelling of bentonite materials for HMC analyses has been studied, with bentonite materials considered as the engineered barrier. It is said that the bentonite material in the TRU disposal facilities is altered chemically by cement leachate. Moreover, there is a concern that chemical alteration changes the expansion characteristics and water permeability of the bentonite material. In this paper, using past test results, the influence of montmorillonite content and the exchange of sodium and calcium ions on mechanical and hydraulics behaviour is examined. Hydraulic/mechanical mathematical modelling is also presented, describing the mechanical behaviour of bentonite from an initially unsaturated state while also taking into account the hydraulic and mechanical characteristics of bentonite mentioned above. We also simulate the saturation process from an initially unsaturated state in a TRU disposal facility, which is modelled one-dimensionally.